Elements

This page documents the public C# API for elements, generated from the XML documentation of the compiled library. Values are immutable, constructors take named arguments and validate them, and read-only properties return what was passed.

ButtonElement

An interactive button that sends a payload or opens a URL.

Required: text, actionId.

See the Slack reference.

Implements IElement.

ButtonElement

Creates and validates a ButtonElement.

public ButtonElement(PlainText text, string actionId, string? url = null, string? value = null, ButtonStyle? style = null, Confirmation? confirm = null, string? accessibilityLabel = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`text`	The button label. Required. Slack allows at most 75 characters. A string is sent as a `plain_text` text object.
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`url`	A URL opened in the user's browser when the button is clicked. Slack still sends an interaction payload. Slack allows at most 3000 characters.
`value`	The application-defined value sent in interaction payloads. Slack allows at most 2000 characters.
`style`	The button's emphasis. Omit it for the default neutral style.
`confirm`	A confirmation dialog shown before the action is sent.
`accessibilityLabel`	The label read by screen readers in place of the visible text. Slack allows at most 75 characters.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: ButtonElement, ButtonStyle, Confirmation, PlainText

Text

Gets the button label.

public PlainText Text { get; }

Related types: PlainText, Text

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

Url

Gets a URL opened in the user's browser when the button is clicked. Slack still sends an interaction payload.

The value, or null when it was not set.

public string? Url { get; }

Value

Gets the application-defined value sent in interaction payloads.

The value, or null when it was not set.

public string? Value { get; }

Style

Gets the button's emphasis. Omit it for the default neutral style.

The value, or null when it was not set.

public ButtonStyle? Style { get; }

Related types: ButtonStyle

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

AccessibilityLabel

Gets the label read by screen readers in place of the visible text.

The value, or null when it was not set.

public string? AccessibilityLabel { get; }

ButtonStyle

Visual emphasis for buttons and confirmation dialogs.

ToWireValue() returns the value Slack expects in JSON.

Constant	Slack value	Meaning
`Primary`	`primary`	Green emphasis for the affirmative action.
`Danger`	`danger`	Red emphasis for destructive actions.

ChannelMultiSelectElement

A menu for selecting multiple public channels.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

ChannelMultiSelectElement

Creates and validates a ChannelMultiSelectElement.

public ChannelMultiSelectElement(string actionId, IEnumerable<string>? initialChannels = null, Confirmation? confirm = null, int? maxSelectedItems = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`initialChannels`	Channel IDs that are selected when the menu loads.
`confirm`	A confirmation dialog shown before the action is sent.
`maxSelectedItems`	The maximum number of items a user can select.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. Slack allows at most 150 characters. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: ChannelMultiSelectElement, Confirmation, PlainText

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

InitialChannels

Gets channel IDs that are selected when the menu loads.

The values in order, or an empty list when none were set.

public IReadOnlyList<string> InitialChannels { get; }

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

MaxSelectedItems

Gets the maximum number of items a user can select.

The value, or null when it was not set.

public int? MaxSelectedItems { get; }

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

ChannelSelectElement

A menu for selecting one public channel.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

ChannelSelectElement

Creates and validates a ChannelSelectElement.

public ChannelSelectElement(string actionId, string? initialChannel = null, bool? responseUrlEnabled = null, Confirmation? confirm = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`initialChannel`	The channel ID selected when the menu loads.
`responseUrlEnabled`	Whether the selected conversation receives a response URL in the view submission payload. Only valid in modals.
`confirm`	A confirmation dialog shown before the action is sent.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. Slack allows at most 150 characters. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: ChannelSelectElement, Confirmation, PlainText

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

InitialChannel

Gets the channel ID selected when the menu loads.

The value, or null when it was not set.

public string? InitialChannel { get; }

ResponseUrlEnabled

Gets whether the selected conversation receives a response URL in the view submission payload. Only valid in modals.

The value, or null when it was not set.

public bool? ResponseUrlEnabled { get; }

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

CheckboxesElement

A group of checkboxes.

Required: actionId, options.

See the Slack reference.

Implements IElement, IInputElement.

CheckboxesElement

Creates and validates a CheckboxesElement.

public CheckboxesElement(string actionId, IEnumerable<Option> options, IEnumerable<Option>? initialOptions = null, Confirmation? confirm = null, bool? focusOnLoad = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`options`	Selectable options in display order. Required. Must contain between 1 and 10 items.
`initialOptions`	Options that are selected when the element loads. Each must match an option in the element.
`confirm`	A confirmation dialog shown before the action is sent.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: CheckboxesElement, Confirmation, Option

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

Options

Gets selectable options in display order.

The values in order, or an empty list when none were set.

public IReadOnlyList<Option> Options { get; }

Related types: Option

InitialOptions

Gets options that are selected when the element loads. Each must match an option in the element.

The values in order, or an empty list when none were set.

public IReadOnlyList<Option> InitialOptions { get; }

Related types: Option

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

ConversationMultiSelectElement

A menu for selecting multiple conversations.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

ConversationMultiSelectElement

Creates and validates a ConversationMultiSelectElement.

public ConversationMultiSelectElement(string actionId, IEnumerable<string>? initialConversations = null, bool? defaultToCurrentConversation = null, ConversationFilter? filter = null, Confirmation? confirm = null, int? maxSelectedItems = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`initialConversations`	Conversation IDs that are selected when the menu loads.
`defaultToCurrentConversation`	Whether the menu pre-selects the conversation the user is viewing.
`filter`	Which conversation types the menu offers.
`confirm`	A confirmation dialog shown before the action is sent.
`maxSelectedItems`	The maximum number of items a user can select.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. Slack allows at most 150 characters. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

InitialConversations

Gets conversation IDs that are selected when the menu loads.

The values in order, or an empty list when none were set.

public IReadOnlyList<string> InitialConversations { get; }

DefaultToCurrentConversation

Gets whether the menu pre-selects the conversation the user is viewing.

The value, or null when it was not set.

public bool? DefaultToCurrentConversation { get; }

Filter

Gets which conversation types the menu offers.

The value, or null when it was not set.

public ConversationFilter? Filter { get; }

Related types: ConversationFilter

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

MaxSelectedItems

Gets the maximum number of items a user can select.

The value, or null when it was not set.

public int? MaxSelectedItems { get; }

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

ConversationSelectElement

A menu for selecting one conversation.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

ConversationSelectElement

Creates and validates a ConversationSelectElement.

public ConversationSelectElement(string actionId, string? initialConversation = null, bool? defaultToCurrentConversation = null, ConversationFilter? filter = null, bool? responseUrlEnabled = null, Confirmation? confirm = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`initialConversation`	The conversation ID selected when the menu loads.
`defaultToCurrentConversation`	Whether the menu pre-selects the conversation the user is viewing.
`filter`	Which conversation types the menu offers.
`responseUrlEnabled`	Whether the selected conversation receives a response URL in the view submission payload. Only valid in modals.
`confirm`	A confirmation dialog shown before the action is sent.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. Slack allows at most 150 characters. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

InitialConversation

Gets the conversation ID selected when the menu loads.

The value, or null when it was not set.

public string? InitialConversation { get; }

DefaultToCurrentConversation

Gets whether the menu pre-selects the conversation the user is viewing.

The value, or null when it was not set.

public bool? DefaultToCurrentConversation { get; }

Filter

Gets which conversation types the menu offers.

The value, or null when it was not set.

public ConversationFilter? Filter { get; }

Related types: ConversationFilter

ResponseUrlEnabled

Gets whether the selected conversation receives a response URL in the view submission payload. Only valid in modals.

The value, or null when it was not set.

public bool? ResponseUrlEnabled { get; }

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

DatePickerElement

A calendar date picker.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

DatePickerElement

Creates and validates a DatePickerElement.

public DatePickerElement(string actionId, string? initialDate = null, Confirmation? confirm = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`initialDate`	The initially selected date, formatted as YYYY-MM-DD.
`confirm`	A confirmation dialog shown before the action is sent.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: Confirmation, DatePickerElement, PlainText

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

InitialDate

Gets the initially selected date, formatted as YYYY-MM-DD.

The value, or null when it was not set.

public string? InitialDate { get; }

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

DateTimePickerElement

A combined date and time picker.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

DateTimePickerElement

Creates and validates a DateTimePickerElement.

public DateTimePickerElement(string actionId, long? initialDateTime = null, Confirmation? confirm = null, bool? focusOnLoad = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`initialDateTime`	The initially selected moment as a UNIX timestamp in seconds.
`confirm`	A confirmation dialog shown before the action is sent.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: Confirmation, DateTimePickerElement

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

InitialDateTime

Gets the initially selected moment as a UNIX timestamp in seconds.

The value, or null when it was not set.

public long? InitialDateTime { get; }

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

EmailInputElement

A single-line input that accepts an email address.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

EmailInputElement

Creates and validates a EmailInputElement.

public EmailInputElement(string actionId, string? initialValue = null, DispatchActionConfiguration? dispatchActionConfig = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`initialValue`	The value present when the input loads.
`dispatchActionConfig`	Which user interactions send a block_actions payload.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

InitialValue

Gets the value present when the input loads.

The value, or null when it was not set.

public string? InitialValue { get; }

DispatchActionConfig

Gets which user interactions send a block_actions payload.

The value, or null when it was not set.

public DispatchActionConfiguration? DispatchActionConfig { get; }

Related types: DispatchActionConfiguration

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

ExternalMultiSelectElement

A menu for selecting multiple options loaded from your app.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

ExternalMultiSelectElement

Creates and validates a ExternalMultiSelectElement.

public ExternalMultiSelectElement(string actionId, int? minQueryLength = null, IEnumerable<Option>? initialOptions = null, Confirmation? confirm = null, int? maxSelectedItems = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`minQueryLength`	How many characters the user must type before Slack queries your options endpoint.
`initialOptions`	Options that are selected when the element loads. Each must match an option in the element.
`confirm`	A confirmation dialog shown before the action is sent.
`maxSelectedItems`	The maximum number of items a user can select.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. Slack allows at most 150 characters. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

MinQueryLength

Gets how many characters the user must type before Slack queries your options endpoint.

The value, or null when it was not set.

public int? MinQueryLength { get; }

InitialOptions

Gets options that are selected when the element loads. Each must match an option in the element.

The values in order, or an empty list when none were set.

public IReadOnlyList<Option> InitialOptions { get; }

Related types: Option

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

MaxSelectedItems

Gets the maximum number of items a user can select.

The value, or null when it was not set.

public int? MaxSelectedItems { get; }

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

ExternalSelectElement

A menu for selecting one option loaded from your app.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

ExternalSelectElement

Creates and validates a ExternalSelectElement.

public ExternalSelectElement(string actionId, int? minQueryLength = null, Option? initialOption = null, Confirmation? confirm = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`minQueryLength`	How many characters the user must type before Slack queries your options endpoint.
`initialOption`	The option selected when the element loads. It must match an option in the element.
`confirm`	A confirmation dialog shown before the action is sent.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. Slack allows at most 150 characters. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: Confirmation, ExternalSelectElement, Option, PlainText

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

MinQueryLength

Gets how many characters the user must type before Slack queries your options endpoint.

The value, or null when it was not set.

public int? MinQueryLength { get; }

InitialOption

Gets the option selected when the element loads. It must match an option in the element.

The value, or null when it was not set.

public Option? InitialOption { get; }

Related types: Option

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

FeedbackButtonsElement

A pair of thumbs-up and thumbs-down feedback buttons.

Required: positiveButton, negativeButton.

See the Slack reference.

Implements IContextActionsElement, IElement.

FeedbackButtonsElement

Creates and validates a FeedbackButtonsElement.

public FeedbackButtonsElement(FeedbackButton positiveButton, FeedbackButton negativeButton, string? actionId = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`positiveButton`	The button for positive feedback. Required.
`negativeButton`	The button for negative feedback. Required.
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Slack allows at most 255 characters.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: FeedbackButton, FeedbackButtonsElement

PositiveButton

Gets the button for positive feedback.

public FeedbackButton PositiveButton { get; }

Related types: FeedbackButton

NegativeButton

Gets the button for negative feedback.

public FeedbackButton NegativeButton { get; }

Related types: FeedbackButton

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

The value, or null when it was not set.

public string? ActionId { get; }

FileInputElement

An input that lets users upload files.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

FileInputElement

Creates and validates a FileInputElement.

public FileInputElement(string actionId, IEnumerable<string>? filetypes = null, int? maxFiles = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`filetypes`	Accepted file extensions, such as pdf or png.
`maxFiles`	The maximum number of files a user can upload. Must be between 1 and 10.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: FileInputElement

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

Filetypes

Gets accepted file extensions, such as pdf or png.

The values in order, or an empty list when none were set.

public IReadOnlyList<string> Filetypes { get; }

MaxFiles

Gets the maximum number of files a user can upload.

The value, or null when it was not set.

public int? MaxFiles { get; }

IconButtonElement

A button that shows an icon instead of text.

Required: text.

See the Slack reference.

Implements IContextActionsElement, IElement.

IconButtonElement

Creates and validates a IconButtonElement.

public IconButtonElement(PlainText text, IconButtonIcon? icon = null, string? actionId = null, string? value = null, Confirmation? confirm = null, string? accessibilityLabel = null, IEnumerable<string>? visibleToUserIds = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`text`	The text used as the button's accessible name. Required. A string is sent as a `plain_text` text object.
`icon`	The icon shown on the button.
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Slack allows at most 255 characters.
`value`	The application-defined value sent in interaction payloads.
`confirm`	A confirmation dialog shown before the action is sent.
`accessibilityLabel`	The label read by screen readers in place of the visible text.
`visibleToUserIds`	The IDs of users who can see this button. Slack allows at most 10 items.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Text

Gets the text used as the button's accessible name.

public PlainText Text { get; }

Related types: PlainText, Text

Icon

Gets the icon shown on the button.

public IconButtonIcon? Icon { get; }

Related types: IconButtonIcon

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

The value, or null when it was not set.

public string? ActionId { get; }

Value

Gets the application-defined value sent in interaction payloads.

The value, or null when it was not set.

public string? Value { get; }

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

AccessibilityLabel

Gets the label read by screen readers in place of the visible text.

The value, or null when it was not set.

public string? AccessibilityLabel { get; }

VisibleToUserIds

Gets the IDs of users who can see this button.

The values in order, or an empty list when none were set.

public IReadOnlyList<string> VisibleToUserIds { get; }

IconButtonIcon

Icons supported by icon buttons.

ToWireValue() returns the value Slack expects in JSON.

Constant	Slack value	Meaning
`Trash`	`trash`	A trash can, for delete actions.

IElement

A validated interactive, visual, or input element nested inside a Slack block.

Implemented by ButtonElement, ChannelMultiSelectElement, ChannelSelectElement, CheckboxesElement, ConversationMultiSelectElement, ConversationSelectElement, DatePickerElement, DateTimePickerElement, EmailInputElement, ExternalMultiSelectElement, ExternalSelectElement, FeedbackButtonsElement, FileInputElement, IconButtonElement, ImageElement, NumberInputElement, OverflowElement, PlainTextInputElement, RadioButtonsElement, RichTextInputElement, StaticMultiSelectElement, StaticSelectElement, TimePickerElement, UrlInputElement, UserMultiSelectElement, UserSelectElement, WorkflowButtonElement.

IInputElement

An element that can be placed in an input block.

Implemented by ChannelMultiSelectElement, ChannelSelectElement, CheckboxesElement, ConversationMultiSelectElement, ConversationSelectElement, DatePickerElement, DateTimePickerElement, EmailInputElement, ExternalMultiSelectElement, ExternalSelectElement, FileInputElement, NumberInputElement, PlainTextInputElement, RadioButtonsElement, RichTextInputElement, StaticMultiSelectElement, StaticSelectElement, TimePickerElement, UrlInputElement, UserMultiSelectElement, UserSelectElement.

ImageElement

An image displayed inside a section, context, or card.

Required: altText.
Provide exactly one of an image URL or a Slack file.

See the Slack reference.

Implements IContextElement, IElement.

ImageElement

Creates and validates a ImageElement.

public ImageElement(string altText, string? imageUrl = null, SlackFile? slackFile = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`altText`	A plain-text summary of the image or video for assistive technology. Required.
`imageUrl`	The publicly accessible URL of the image. Cannot be combined with a Slack file.
`slackFile`	A file hosted in Slack as the image source. Cannot be combined with an image URL.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: ImageElement, SlackFile

AltText

Gets a plain-text summary of the image or video for assistive technology.

public string AltText { get; }

ImageUrl

Gets the publicly accessible URL of the image. Cannot be combined with a Slack file.

The value, or null when it was not set.

public string? ImageUrl { get; }

SlackFile

Gets a file hosted in Slack as the image source. Cannot be combined with an image URL.

The value, or null when it was not set.

public SlackFile? SlackFile { get; }

Related types: SlackFile

NumberInputElement

An input that accepts whole or decimal numbers.

Required: actionId.
The minimum value cannot exceed the maximum value.

See the Slack reference.

Implements IElement, IInputElement.

NumberInputElement

Creates and validates a NumberInputElement.

public NumberInputElement(string actionId, bool? isDecimalAllowed = null, string? initialValue = null, double? minValue = null, double? maxValue = null, DispatchActionConfiguration? dispatchActionConfig = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`isDecimalAllowed`	Whether the input accepts decimal numbers.
`initialValue`	The number present when the input loads, as a string such as 42 or 3.5.
`minValue`	The smallest accepted number.
`maxValue`	The largest accepted number.
`dispatchActionConfig`	Which user interactions send a block_actions payload.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

IsDecimalAllowed

Gets whether the input accepts decimal numbers.

The value, or null when it was not set.

public bool? IsDecimalAllowed { get; }

InitialValue

Gets the number present when the input loads, as a string such as 42 or 3.5.

The value, or null when it was not set.

public string? InitialValue { get; }

MinValue

Gets the smallest accepted number.

The value, or null when it was not set.

public double? MinValue { get; }

MaxValue

Gets the largest accepted number.

The value, or null when it was not set.

public double? MaxValue { get; }

DispatchActionConfig

Gets which user interactions send a block_actions payload.

The value, or null when it was not set.

public DispatchActionConfiguration? DispatchActionConfig { get; }

Related types: DispatchActionConfiguration

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

OverflowElement

A compact menu of up to five options.

Required: actionId, options.

See the Slack reference.

Implements IElement.

OverflowElement

Creates and validates a OverflowElement.

public OverflowElement(string actionId, IEnumerable<Option> options, Confirmation? confirm = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`options`	Selectable options in display order. Required. Must contain between 1 and 5 items.
`confirm`	A confirmation dialog shown before the action is sent.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: Confirmation, Option, OverflowElement

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

Options

Gets selectable options in display order.

The values in order, or an empty list when none were set.

public IReadOnlyList<Option> Options { get; }

Related types: Option

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

PlainTextInputElement

A single-line or multi-line free-text input.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

PlainTextInputElement

Creates and validates a PlainTextInputElement.

public PlainTextInputElement(string actionId, string? initialValue = null, bool? multiline = null, int? minLength = null, int? maxLength = null, DispatchActionConfiguration? dispatchActionConfig = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`initialValue`	The value present when the input loads.
`multiline`	Whether the input is a multi-line text area.
`minLength`	The minimum number of characters the user must enter.
`maxLength`	The maximum number of characters the user can enter. Must be at most 3000.
`dispatchActionConfig`	Which user interactions send a block_actions payload.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

InitialValue

Gets the value present when the input loads.

The value, or null when it was not set.

public string? InitialValue { get; }

Multiline

Gets whether the input is a multi-line text area.

The value, or null when it was not set.

public bool? Multiline { get; }

MinLength

Gets the minimum number of characters the user must enter.

The value, or null when it was not set.

public int? MinLength { get; }

MaxLength

Gets the maximum number of characters the user can enter.

The value, or null when it was not set.

public int? MaxLength { get; }

DispatchActionConfig

Gets which user interactions send a block_actions payload.

The value, or null when it was not set.

public DispatchActionConfiguration? DispatchActionConfig { get; }

Related types: DispatchActionConfiguration

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

RadioButtonsElement

A group of radio buttons.

Required: actionId, options.

See the Slack reference.

Implements IElement, IInputElement.

RadioButtonsElement

Creates and validates a RadioButtonsElement.

public RadioButtonsElement(string actionId, IEnumerable<Option> options, Option? initialOption = null, Confirmation? confirm = null, bool? focusOnLoad = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`options`	Selectable options in display order. Required. Must contain between 1 and 10 items.
`initialOption`	The option selected when the element loads. It must match an option in the element.
`confirm`	A confirmation dialog shown before the action is sent.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: Confirmation, Option, RadioButtonsElement

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

Options

Gets selectable options in display order.

The values in order, or an empty list when none were set.

public IReadOnlyList<Option> Options { get; }

Related types: Option

InitialOption

Gets the option selected when the element loads. It must match an option in the element.

The value, or null when it was not set.

public Option? InitialOption { get; }

Related types: Option

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

RichTextInputElement

An input that accepts formatted rich text.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

RichTextInputElement

Creates and validates a RichTextInputElement.

public RichTextInputElement(string actionId, RichTextText? initialValue = null, DispatchActionConfiguration? dispatchActionConfig = null, bool? focusOnLoad = null, PlainText? placeholder = null, int? minLines = null, int? maxLines = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`initialValue`	The rich text present when the input loads.
`dispatchActionConfig`	Which user interactions send a block_actions payload.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. A string is sent as a `plain_text` text object.
`minLines`	The minimum visible height of the input, in lines.
`maxLines`	The maximum visible height of the input, in lines.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

InitialValue

Gets the rich text present when the input loads.

The value, or null when it was not set.

public RichTextText? InitialValue { get; }

Related types: RichTextText

DispatchActionConfig

Gets which user interactions send a block_actions payload.

The value, or null when it was not set.

public DispatchActionConfiguration? DispatchActionConfig { get; }

Related types: DispatchActionConfiguration

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

MinLines

Gets the minimum visible height of the input, in lines.

The value, or null when it was not set.

public int? MinLines { get; }

MaxLines

Gets the maximum visible height of the input, in lines.

The value, or null when it was not set.

public int? MaxLines { get; }

StaticMultiSelectElement

A menu for selecting multiple options defined in the payload.

Required: actionId.
Use options or option groups, not both.

See the Slack reference.

Implements IElement, IInputElement.

StaticMultiSelectElement

Creates and validates a StaticMultiSelectElement.

public StaticMultiSelectElement(string actionId, IEnumerable<Option>? options = null, IEnumerable<OptionGroup>? optionGroups = null, IEnumerable<Option>? initialOptions = null, Confirmation? confirm = null, int? maxSelectedItems = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`options`	Selectable options in display order. Slack allows at most 100 items.
`optionGroups`	Labelled groups of options in display order. Cannot be combined with ungrouped options. Slack allows at most 100 items.
`initialOptions`	Options that are selected when the element loads. Each must match an option in the element.
`confirm`	A confirmation dialog shown before the action is sent.
`maxSelectedItems`	The maximum number of items a user can select.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. Slack allows at most 150 characters. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

Options

Gets selectable options in display order.

The values in order, or an empty list when none were set.

public IReadOnlyList<Option> Options { get; }

Related types: Option

OptionGroups

Gets labelled groups of options in display order. Cannot be combined with ungrouped options.

The values in order, or an empty list when none were set.

public IReadOnlyList<OptionGroup> OptionGroups { get; }

Related types: OptionGroup

InitialOptions

Gets options that are selected when the element loads. Each must match an option in the element.

The values in order, or an empty list when none were set.

public IReadOnlyList<Option> InitialOptions { get; }

Related types: Option

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

MaxSelectedItems

Gets the maximum number of items a user can select.

The value, or null when it was not set.

public int? MaxSelectedItems { get; }

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

StaticSelectElement

A menu for selecting one option defined in the payload.

Required: actionId.
Use options or option groups, not both.

See the Slack reference.

Implements IElement, IInputElement.

StaticSelectElement

Creates and validates a StaticSelectElement.

public StaticSelectElement(string actionId, IEnumerable<Option>? options = null, IEnumerable<OptionGroup>? optionGroups = null, Option? initialOption = null, Confirmation? confirm = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`options`	Selectable options in display order. Slack allows at most 100 items.
`optionGroups`	Labelled groups of options in display order. Cannot be combined with ungrouped options. Slack allows at most 100 items.
`initialOption`	The option selected when the element loads. It must match an option in the element.
`confirm`	A confirmation dialog shown before the action is sent.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. Slack allows at most 150 characters. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

Options

Gets selectable options in display order.

The values in order, or an empty list when none were set.

public IReadOnlyList<Option> Options { get; }

Related types: Option

OptionGroups

Gets labelled groups of options in display order. Cannot be combined with ungrouped options.

The values in order, or an empty list when none were set.

public IReadOnlyList<OptionGroup> OptionGroups { get; }

Related types: OptionGroup

InitialOption

Gets the option selected when the element loads. It must match an option in the element.

The value, or null when it was not set.

public Option? InitialOption { get; }

Related types: Option

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

TimePickerElement

A time-of-day picker.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

TimePickerElement

Creates and validates a TimePickerElement.

public TimePickerElement(string actionId, string? initialTime = null, string? timezone = null, Confirmation? confirm = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`initialTime`	The initially selected time, formatted as HH:mm in 24-hour time.
`timezone`	The IANA time zone used to display the time, such as Australia/Brisbane.
`confirm`	A confirmation dialog shown before the action is sent.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: Confirmation, PlainText, TimePickerElement

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

InitialTime

Gets the initially selected time, formatted as HH:mm in 24-hour time.

The value, or null when it was not set.

public string? InitialTime { get; }

Timezone

Gets the IANA time zone used to display the time, such as Australia/Brisbane.

The value, or null when it was not set.

public string? Timezone { get; }

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

UrlInputElement

A single-line input that accepts a URL.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

UrlInputElement

Creates and validates a UrlInputElement.

public UrlInputElement(string actionId, string? initialValue = null, DispatchActionConfiguration? dispatchActionConfig = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`initialValue`	The value present when the input loads.
`dispatchActionConfig`	Which user interactions send a block_actions payload.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

InitialValue

Gets the value present when the input loads.

The value, or null when it was not set.

public string? InitialValue { get; }

DispatchActionConfig

Gets which user interactions send a block_actions payload.

The value, or null when it was not set.

public DispatchActionConfiguration? DispatchActionConfig { get; }

Related types: DispatchActionConfiguration

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

UserMultiSelectElement

A menu for selecting multiple workspace users.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

UserMultiSelectElement

Creates and validates a UserMultiSelectElement.

public UserMultiSelectElement(string actionId, IEnumerable<string>? initialUsers = null, Confirmation? confirm = null, int? maxSelectedItems = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`initialUsers`	User IDs that are selected when the menu loads.
`confirm`	A confirmation dialog shown before the action is sent.
`maxSelectedItems`	The maximum number of items a user can select.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. Slack allows at most 150 characters. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: Confirmation, PlainText, UserMultiSelectElement

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

InitialUsers

Gets user IDs that are selected when the menu loads.

The values in order, or an empty list when none were set.

public IReadOnlyList<string> InitialUsers { get; }

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

MaxSelectedItems

Gets the maximum number of items a user can select.

The value, or null when it was not set.

public int? MaxSelectedItems { get; }

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

UserSelectElement

A menu for selecting one workspace user.

Required: actionId.

See the Slack reference.

Implements IElement, IInputElement.

UserSelectElement

Creates and validates a UserSelectElement.

public UserSelectElement(string actionId, string? initialUser = null, Confirmation? confirm = null, bool? focusOnLoad = null, PlainText? placeholder = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Required. Slack allows at most 255 characters.
`initialUser`	The user ID selected when the menu loads.
`confirm`	A confirmation dialog shown before the action is sent.
`focusOnLoad`	Whether the element receives focus when the view opens. Only one element per view may do so.
`placeholder`	The placeholder text shown before a value is chosen. Slack allows at most 150 characters. A string is sent as a `plain_text` text object.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Related types: Confirmation, PlainText, UserSelectElement

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

public string ActionId { get; }

InitialUser

Gets the user ID selected when the menu loads.

The value, or null when it was not set.

public string? InitialUser { get; }

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

FocusOnLoad

Gets whether the element receives focus when the view opens. Only one element per view may do so.

The value, or null when it was not set.

public bool? FocusOnLoad { get; }

Placeholder

Gets the placeholder text shown before a value is chosen.

The value, or null when it was not set.

public PlainText? Placeholder { get; }

Related types: PlainText

WorkflowButtonElement

A button that starts a workflow through a link trigger.

Required: text, workflow.

See the Slack reference.

Implements IElement.

WorkflowButtonElement

Creates and validates a WorkflowButtonElement.

public WorkflowButtonElement(PlainText text, Workflow workflow, string? actionId = null, Confirmation? confirm = null, ButtonStyle? style = null, string? accessibilityLabel = null, IReadOnlyDictionary<string, object?>? additionalFields = null)

Parameter	Description
`text`	The button label. Required. A string is sent as a `plain_text` text object.
`workflow`	The workflow started when the button is clicked. Required.
`actionId`	The identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block. Slack allows at most 255 characters.
`confirm`	A confirmation dialog shown before the action is sent.
`style`	The button's emphasis. Omit it for the default neutral style.
`accessibilityLabel`	The label read by screen readers in place of the visible text.
`additionalFields`	Slack fields that have no named parameter yet, such as a field Slack introduced after this release. Values must be strings, numbers, booleans, lists, dictionaries, JSON nodes, or slackblocks values, and are validated with the rest of the object. Typed properties do not reflect them, and a field cannot be set both here and through its named parameter.

Throws	When
`ValidationException`	The value breaks a Block Kit rule, such as a missing required field or an exceeded length limit.
`ArgumentException`	A collection contains `null`, or an additional field cannot be written as JSON or repeats a named parameter.

Text

Gets the button label.

public PlainText Text { get; }

Related types: PlainText, Text

Workflow

Gets the workflow started when the button is clicked.

public Workflow Workflow { get; }

Related types: Workflow

ActionId

Gets the identifier Slack returns in interaction payloads when a user acts on this element. It must be unique among the elements of its block.

The value, or null when it was not set.

public string? ActionId { get; }

Confirm

Gets a confirmation dialog shown before the action is sent.

The value, or null when it was not set.

public Confirmation? Confirm { get; }

Related types: Confirmation

Style

Gets the button's emphasis. Omit it for the default neutral style.

The value, or null when it was not set.

public ButtonStyle? Style { get; }

Related types: ButtonStyle

AccessibilityLabel

Gets the label read by screen readers in place of the visible text.

The value, or null when it was not set.

public string? AccessibilityLabel { get; }

ButtonElement​

ButtonElement​

Text​

ActionId​

Url​

Value​

Style​

Confirm​

AccessibilityLabel​

ButtonStyle​

ChannelMultiSelectElement​

ChannelMultiSelectElement​

ActionId​

InitialChannels​

Confirm​

MaxSelectedItems​

FocusOnLoad​

Placeholder​

ChannelSelectElement​

ChannelSelectElement​

ActionId​

InitialChannel​

ResponseUrlEnabled​

Confirm​

FocusOnLoad​

Placeholder​

CheckboxesElement​

CheckboxesElement​

ActionId​

Options​

InitialOptions​

Confirm​

FocusOnLoad​

ConversationMultiSelectElement​

ConversationMultiSelectElement​

ActionId​

InitialConversations​

DefaultToCurrentConversation​

Filter​

Confirm​

MaxSelectedItems​

FocusOnLoad​

Placeholder​

ConversationSelectElement​

ConversationSelectElement​

ActionId​

InitialConversation​

DefaultToCurrentConversation​

Filter​

ResponseUrlEnabled​

Confirm​

FocusOnLoad​

Placeholder​

DatePickerElement​

DatePickerElement​

ActionId​

InitialDate​

Confirm​

FocusOnLoad​

Placeholder​

DateTimePickerElement​

DateTimePickerElement​

ActionId​

InitialDateTime​

Confirm​

FocusOnLoad​

EmailInputElement​

EmailInputElement​

ActionId​

InitialValue​

DispatchActionConfig​

FocusOnLoad​

Placeholder​

ExternalMultiSelectElement​

ExternalMultiSelectElement​

ActionId​

MinQueryLength​

InitialOptions​

Confirm​

MaxSelectedItems​

ButtonElement

ButtonElement

Text

ActionId

Url

Value

Style

Confirm

AccessibilityLabel

ButtonStyle

ChannelMultiSelectElement

ChannelMultiSelectElement

ActionId

InitialChannels

Confirm

MaxSelectedItems

FocusOnLoad

Placeholder

ChannelSelectElement

ChannelSelectElement

ActionId

InitialChannel

ResponseUrlEnabled

Confirm

FocusOnLoad

Placeholder

CheckboxesElement

CheckboxesElement

ActionId

Options

InitialOptions

Confirm

FocusOnLoad

ConversationMultiSelectElement

ConversationMultiSelectElement

ActionId

InitialConversations

DefaultToCurrentConversation

Filter

Confirm

MaxSelectedItems

FocusOnLoad

Placeholder

ConversationSelectElement

ConversationSelectElement

ActionId

InitialConversation

DefaultToCurrentConversation

Filter

ResponseUrlEnabled

Confirm

FocusOnLoad

Placeholder

DatePickerElement

DatePickerElement

ActionId

InitialDate

Confirm

FocusOnLoad

Placeholder

DateTimePickerElement

DateTimePickerElement

ActionId

InitialDateTime

Confirm

FocusOnLoad

EmailInputElement

EmailInputElement

ActionId

InitialValue

DispatchActionConfig

FocusOnLoad

Placeholder

ExternalMultiSelectElement

ExternalMultiSelectElement

ActionId

MinQueryLength

InitialOptions

Confirm

MaxSelectedItems