Cards v2

Card

A card interface displayed in a Google Chat message or Google Workspace Add-on.

Cards support a defined layout, interactive UI elements like buttons, and rich media like images. Use cards to present detailed information, gather information from users, and guide users to take a next step.

To learn how to build cards, see the following documentation:

• For Google Chat apps, see Design dynamic, interactive, and consistent UIs with cards.
• For Google Workspace Add-ons, see Card-based interfaces.

Example: Card message for a Google Chat app

To create the sample card message in Google Chat, use the following JSON:

{
  "cardsV2": [
    {
      "cardId": "unique-card-id",
      "card": {
        "header": {
          "title": "Sasha",
          "subtitle": "Software Engineer",
          "imageUrl":
          "https://developers.google.com/chat/images/quickstart-app-avatar.png",
          "imageType": "CIRCLE",
          "imageAltText": "Avatar for Sasha",
        },
        "sections": [
          {
            "header": "Contact Info",
            "collapsible": true,
            "uncollapsibleWidgetsCount": 1,
            "widgets": [
              {
                "decoratedText": {
                  "startIcon": {
                    "knownIcon": "EMAIL",
                  },
                  "text": "[e-mail]",
                }
              },
              {
                "decoratedText": {
                  "startIcon": {
                    "knownIcon": "PERSON",
                  },
                  "text": "<font color=\"#80e27e\">Online</font>",
                },
              },
              {
                "decoratedText": {
                  "startIcon": {
                    "knownIcon": "PHONE",
                  },
                  "text": "[phone]",
                }
              },
              {
                "buttonList": {
                  "buttons": [
                    {
                      "text": "Share",
                      "onClick": {
                        "openLink": {
                          "url": "https://example.com/share",
                        }
                      }
                    },
                    {
                      "text": "Edit",
                      "onClick": {
                        "action": {
                          "function": "goToView",
                          "parameters": [
                            {
                              "key": "viewType",
                              "value": "EDIT",
                            }
                          ],
                        }
                      }
                    },
                  ],
                }
              },
            ],
          },
        ],
      },
    }
  ],
}

JSON representation
{ "header": { object (CardHeader) }, "sections": [ { object (Section) } ], "sectionDividerStyle": enum (DividerStyle), "cardActions": [ { object (CardAction) } ], "name": string, "fixedFooter": { object (CardFixedFooter) }, "displayStyle": enum (DisplayStyle), "peekCardHeader": { object (CardHeader) } }

Fields
header	object (CardHeader) The header of the card. A header usually contains a leading image and a title. Headers always appear at the top of a card.
sections[]	object (Section) Contains a collection of widgets. Each section has its own, optional header. Sections are visually separated by a line divider. For an example in Google Chat apps, see Card section.
sectionDividerStyle	enum (DividerStyle) The divider style between sections.
cardActions[]	object (CardAction) The card's actions. Actions are added to the card's toolbar menu. Because Chat app cards have no toolbar, cardActions[] isn't supported by Chat apps. For example, the following JSON constructs a card action menu with Settings and Send Feedback options: "cardActions": [ { "actionLabel": "Settings", "onClick": { "action": { "functionName": "goToView", "parameters": [ { "key": "viewType", "value": "SETTING" } ], "loadIndicator": "LoadIndicator.SPINNER" } } }, { "actionLabel": "Send Feedback", "onClick": { "openLink": { "url": "https://example.com/feedback" } } } ]
name	string Name of the card. Used as a card identifier in card navigation. Because Chat apps don't support card navigation, they ignore this field.
fixedFooter	object (CardFixedFooter) The fixed footer shown at the bottom of this card. Setting fixedFooter without specifying a primaryButton or a secondaryButton causes an error. Supported by Google Workspace Add-ons and Chat apps. For Chat apps, you can use fixed footers in dialogs, but not card messages.
displayStyle	enum (DisplayStyle) In Google Workspace add-ons, sets the display properties of the peekCardHeader. Not supported by Chat apps.
peekCardHeader	object (CardHeader) When displaying contextual content, the peek card header acts as a placeholder so that the user can navigate forward between the homepage cards and the contextual cards. Not supported by Chat apps.

CardHeader

Represents a card header. For an example in Google Chat apps, see Card header.

JSON representation
{ "title": string, "subtitle": string, "imageType": enum (ImageType), "imageUrl": string, "imageAltText": string }

Fields
title	string Required. The title of the card header. The header has a fixed height: if both a title and subtitle are specified, each takes up one line. If only the title is specified, it takes up both lines.
subtitle	string The subtitle of the card header. If specified, appears on its own line below the title.
imageType	enum (ImageType) The shape used to crop the image.
imageUrl	string The HTTPS URL of the image in the card header.
imageAltText	string The alternative text of this image that's used for accessibility.

ImageType

The shape used to crop the image.

Enums
SQUARE	Default value. Applies a square mask to the image. For example, a 4x3 image becomes 3x3.
CIRCLE	Applies a circular mask to the image. For example, a 4x3 image becomes a circle with a diameter of 3.

Section

A section contains a collection of widgets that are rendered vertically in the order that they're specified.

JSON representation
{ "header": string, "widgets": [ { object (Widget) } ], "collapsible": boolean, "uncollapsibleWidgetsCount": integer }

Fields
header	string Text that appears at the top of a section. Supports simple HTML formatted text. For more information about formatting text, see Formatting text in Google Chat apps and Formatting text in Google Workspace Add-ons.
widgets[]	object (Widget) All the widgets in the section. Must contain at least one widget.
collapsible	boolean Indicates whether this section is collapsible. Collapsible sections hide some or all widgets, but users can expand the section to reveal the hidden widgets by clicking Show more. Users can hide the widgets again by clicking Show less. To determine which widgets are hidden, specify uncollapsibleWidgetsCount.
uncollapsibleWidgetsCount	integer The number of uncollapsible widgets which remain visible even when a section is collapsed. For example, when a section contains five widgets and the uncollapsibleWidgetsCount is set to 2, the first two widgets are always shown and the last three are collapsed by default. The uncollapsibleWidgetsCount is taken into account only when collapsible is true.

Widget

Each card is made up of widgets.

A widget is a composite object that can represent one of text, images, buttons, and other object types.

JSON representation

{ "horizontalAlignment": enum (HorizontalAlignment), // Union field data can be only one of the following: "textParagraph": { object (TextParagraph) }, "image": { object (Image) }, "decoratedText": { object (DecoratedText) }, "buttonList": { object (ButtonList) }, "textInput": { object (TextInput) }, "selectionInput": { object (SelectionInput) }, "dateTimePicker": { object (DateTimePicker) }, "divider": { object (Divider) }, "grid": { object (Grid) }, "columns": { object (Columns) } // End of list of possible types for union field data. }

Fields
horizontalAlignment	enum (HorizontalAlignment) Specifies whether widgets align to the left, right, or center of a column.
Union field data. A widget can only have one of the following items. You can use multiple widget fields to display more items. data can be only one of the following:
textParagraph	object (TextParagraph) Displays a text paragraph. Supports simple HTML formatted text. For more information about formatting text, see Formatting text in Google Chat apps and Formatting text in Google Workspace Add-ons. For example, the following JSON creates a bolded text: "textParagraph": { "text": " <b>bold text</b>" }
image	object (Image) Displays an image. For example, the following JSON creates an image with alternative text: "image": { "imageUrl": "https://developers.google.com/chat/images/quickstart-app-avatar.png", "altText": "Chat app avatar" }
decoratedText	object (DecoratedText) Displays a decorated text item. For example, the following JSON creates a decorated text widget showing email address: "decoratedText": { "icon": { "knownIcon": "EMAIL" }, "topLabel": "Email Address", "text": "[e-mail]", "bottomLabel": "This is a new Email address!", "switchControl": { "name": "has_send_welcome_email_to_sasha", "selected": false, "controlType": "CHECKBOX" } }
buttonList	object (ButtonList) A list of buttons. For example, the following JSON creates two buttons. The first is a blue text button and the second is an image button that opens a link: "buttonList": { "buttons": [ { "text": "Edit", "color": { "red": 0, "green": 0, "blue": 1, "alpha": 1 }, "disabled": true, }, { "icon": { "knownIcon": "INVITE", "altText": "check calendar" }, "onClick": { "openLink": { "url": "https://example.com/calendar" } } } ] }
textInput	object (TextInput) Displays a text box that users can type into. For example, the following JSON creates a text input for an email address: "textInput": { "name": "mailing_address", "label": "Mailing Address" } As another example, the following JSON creates a text input for a programming language with static suggestions: "textInput": { "name": "preferred_programing_language", "label": "Preferred Language", "initialSuggestions": { "items": [ { "text": "C++" }, { "text": "Java" }, { "text": "JavaScript" }, { "text": "Python" } ] } }
selectionInput	object (SelectionInput) Displays a selection control that lets users select items. Selection controls can be checkboxes, radio buttons, switches, or dropdown menus. For example, the following JSON creates a dropdown menu that lets users choose a size: "selectionInput": { "name": "size", "label": "Size" "type": "DROPDOWN", "items": [ { "text": "S", "value": "small", "selected": false }, { "text": "M", "value": "medium", "selected": true }, { "text": "L", "value": "large", "selected": false }, { "text": "XL", "value": "extra_large", "selected": false } ] }
dateTimePicker	object (DateTimePicker) Displays a widget that lets users input a date, time, or date and time. For example, the following JSON creates a date time picker to schedule an appointment: "dateTimePicker": { "name": "appointment_time", "label": "Book your appointment at:", "type": "DATE_AND_TIME", "valueMsEpoch": "796435200000" }
divider	object (Divider) Displays a horizontal line divider between widgets. For example, the following JSON creates a divider: "divider": { }
grid	object (Grid) Displays a grid with a collection of items. A grid supports any number of columns and items. The number of rows is determined by the upper bounds of the number items divided by the number of columns. A grid with 10 items and 2 columns has 5 rows. A grid with 11 items and 2 columns has 6 rows. For example, the following JSON creates a 2 column grid with a single item: "grid": { "title": "A fine collection of items", "columnCount": 2, "borderStyle": { "type": "STROKE", "cornerRadius": 4 }, "items": [ { "image": { "imageUri": "https://www.example.com/image.png", "cropStyle": { "type": "SQUARE" }, "borderStyle": { "type": "STROKE" } }, "title": "An item", "textAlignment": "CENTER" } ], "onClick": { "openLink": { "url": "https://www.example.com" } } }
columns	object (Columns) Displays up to 2 columns. To include more than 2 columns, or to use rows, use the Grid widget. For example, the following JSON creates 2 columns that each contain text paragraphs: "columns": { "columnItems": [ { "horizontalSizeStyle": "FILL_AVAILABLE_SPACE", "horizontalAlignment": "CENTER", "verticalAlignment": "CENTER", "widgets": [ { "textParagraph": { "text": "First column text paragraph" } } ] }, { "horizontalSizeStyle": "FILL_AVAILABLE_SPACE", "horizontalAlignment": "CENTER", "verticalAlignment": "CENTER", "widgets": [ { "textParagraph": { "text": "Second column text paragraph" } } ] } ] }

TextParagraph

A paragraph of text that supports formatting. For an example in Google Chat apps, see Text paragraph. For more information about formatting text, see Formatting text in Google Chat apps and Formatting text in Google Workspace Add-ons.

JSON representation
{ "text": string }

Fields
text	string The text that's shown in the widget.

Image

An image that is specified by a URL and can have an onClick action. For an example, see Image.

JSON representation
{ "imageUrl": string, "onClick": { object (OnClick) }, "altText": string }

Fields
imageUrl	string The HTTPS URL that hosts the image. For example: https://developers.google.com/chat/images/quickstart-app-avatar.png
onClick	object (OnClick) When a user clicks the image, the click triggers this action.
altText	string The alternative text of this image that's used for accessibility.

OnClick

Represents how to respond when users click an interactive element on a card, such as a button.

JSON representation
{ // Union field data can be only one of the following: "action": { object (Action) }, "openLink": { object (OpenLink) }, "openDynamicLinkAction": { object (Action) }, "card": { object (Card) } // End of list of possible types for union field data. }

Fields
Union field data. data can be only one of the following:
action	object (Action) If specified, an action is triggered by this onClick.
openLink	object (OpenLink) If specified, this onClick triggers an open link action.
openDynamicLinkAction	object (Action) An add-on triggers this action when the action needs to open a link. This differs from the openLink above in that this needs to talk to server to get the link. Thus some preparation work is required for web client to do before the open link action response comes back. Supported by Google Workspace Add-ons, but not Google Chat apps.
card	object (Card) A new card is pushed to the card stack after clicking if specified. Supported by Google Workspace Add-ons, but not Google Chat apps.

Action

An action that describes the behavior when the form is submitted. For example, you can invoke an Apps Script script to handle the form. If the action is triggered, the form values are sent to the server.

JSON representation
{ "function": string, "parameters": [ { object (ActionParameter) } ], "loadIndicator": enum (LoadIndicator), "persistValues": boolean, "interaction": enum (Interaction) }

Fields
function	string A custom function to invoke when the containing element is clicked or othrwise activated. For example usage, see Create interactive cards.
parameters[]	object (ActionParameter) List of action parameters.
loadIndicator	enum (LoadIndicator) Specifies the loading indicator that the action displays while making the call to the action.
persistValues	boolean Indicates whether form values persist after the action. The default value is false. If true, form values remain after the action is triggered. To let the user make changes while the action is being processed, set LoadIndicator to NONE. For card messages in Chat apps, you must also set the action's ResponseType to UPDATE_MESSAGE and use the same cardId from the card that contained the action. If false, the form values are cleared when the action is triggered. To prevent the user from making changes while the action is being processed, set LoadIndicator to SPINNER.
interaction	enum (Interaction) Optional. Required when opening a dialog. What to do in response to an interaction with a user, such as a user clicking a button in a card message. If unspecified, the app responds by executing an action —like opening a link or running a function—as normal. By specifying an interaction, the app can respond in special interactive ways. For example, by setting interaction to OPEN_DIALOG, the app can open a dialog. When specified, a loading indicator isn't shown. Supported by Chat apps, but not Google Workspace Add-ons. If specified for an add-on, the entire card is stripped and nothing is shown in the client.

ActionParameter

List of string parameters to supply when the action method is invoked. For example, consider three snooze buttons: snooze now, snooze one day, or snooze next week. You might use action method = snooze(), passing the snooze type and snooze time in the list of string parameters.

To learn more, see CommonEventObject.

JSON representation
{ "key": string, "value": string }

Fields
key	string The name of the parameter for the action script.
value	string The value of the parameter.

LoadIndicator

Specifies the loading indicator that the action displays while making the call to the action.

Enums
SPINNER	Displays a spinner to indicate that content is loading.
NONE	Nothing is displayed.

Interaction

Optional. Required when opening a dialog.

What to do in response to an interaction with a user, such as a user clicking a button in a card message.

If unspecified, the app responds by executing an action —like opening a link or running a function—as normal.

By specifying an interaction, the app can respond in special interactive ways. For example, by setting interaction to OPEN_DIALOG, the app can open a dialog.

When specified, a loading indicator isn't shown.

Supported by Chat apps, but not Google Workspace Add-ons. If specified for an add-on, the entire card is stripped and nothing is shown in the client.

Enums
INTERACTION_UNSPECIFIED	Default value. The action executes as normal.
OPEN_DIALOG	Opens a dialog, a windowed, card-based interface that Chat apps use to interact with users. Only supported by Chat apps in response to button-clicks on card messages. Not supported by Google Workspace Add-ons. If specified for an add-on, the entire card is stripped and nothing is shown in the client.

OpenLink

Represents an onClick event that opens a hyperlink.

JSON representation
{ "url": string, "openAs": enum (OpenAs), "onClose": enum (OnClose) }

Fields
url	string The URL to open.
openAs	enum (OpenAs) How to open a link. Not supported by Chat apps.
onClose	enum (OnClose) Whether the client forgets about a link after opening it, or observes it until the window closes. Not supported by Chat apps.

OpenAs

When an OnClick action opens a link, then the client can either open it as a full-size window (if that's the frame used by the client), or an overlay (such as a pop-up). The implementation depends on the client platform capabilities, and the value selected might be ignored if the client doesn't support it. FULL_SIZE is supported by all clients.

Supported by Google Workspace Add-ons, but not Google Chat apps.

Enums
FULL_SIZE	The link opens as a full-size window (if that's the frame used by the client).
OVERLAY	The link opens as an overlay, such as a pop-up.

OnClose

What the client does when a link opened by an OnClick action is closed.

Implementation depends on client platform capabilities. For example, a web browser might open a link in a pop-up window with an OnClose handler.

If both OnOpen and OnClose handlers are set, and the client platform can't support both values, OnClose takes precedence.

Supported by Google Workspace Add-ons, but not Google Chat apps.

Enums
NOTHING	Default value. The card doesn't reload; nothing happens.
RELOAD	Reloads the card after the child window closes. If used in conjunction with OpenAs.OVERLAY, the child window acts as a modal dialog and the parent card is blocked until the child window closes.

DecoratedText

A widget that displays text with optional decorations such as a label above or below the text, an icon in front of the text, a selection widget, or a button after the text. For an example in Google Chat apps, see Decorated text.

JSON representation
{ "icon": { object (Icon) }, "startIcon": { object (Icon) }, "topLabel": string, "text": string, "wrapText": boolean, "bottomLabel": string, "onClick": { object (OnClick) }, // Union field control can be only one of the following: "button": { object (Button) }, "switchControl": { object (SwitchControl) }, "endIcon": { object (Icon) } // End of list of possible types for union field control. }

Fields
icon (deprecated)	object (Icon) This item is deprecated! Deprecated in favor of startIcon.
startIcon	object (Icon) The icon displayed in front of the text.
topLabel	string The text that appears above text. Always truncates.
text	string Required. The primary text. Supports simple formatting. For more information about formatting text, see Formatting text in Google Chat apps and Formatting text in Google Workspace Add-ons.
wrapText	boolean The wrap text setting. If true, the text wraps and displays on multiple lines. Otherwise, the text is truncated. Only applies to text, not topLabel and bottomLabel.
bottomLabel	string The text that appears below text. Always wraps.
onClick	object (OnClick) This action is triggered when users click topLabel or bottomLabel.
Union field control. A button, switch, checkbox, or image that appears to the right-hand side of text in the decoratedText widget. control can be only one of the following:
button	object (Button) A button that a user can click to trigger an action.
switchControl	object (SwitchControl) A switch widget that a user can click to change its state and trigger an action.
endIcon	object (Icon) An icon displayed after the text. Supports built-in and custom icons.

Icon

An icon displayed in a widget on a card. For an example in Google Chat apps, see Icon.

Supports built-in and custom icons.

JSON representation
{ "altText": string, "imageType": enum (ImageType), // Union field icons can be only one of the following: "knownIcon": string, "iconUrl": string // End of list of possible types for union field icons. }

Fields
altText	string Optional. A description of the icon used for accessibility. If unspecified, the default value Button is provided. As a best practice, you should set a helpful description for what the icon displays, and if applicable, what it does. For example, A user's account portrait, or Opens a new browser tab and navigates to the Google Chat developer documentation at https://developers.google.com/chat. If the icon is set in a Button, the altText appears as helper text when the user hovers over the button. However, if the button also sets text, the icon's altText is ignored.
imageType	enum (ImageType) The crop style applied to the image. In some cases, applying a CIRCLE crop causes the image to be drawn larger than a built-in icon.
Union field icons. The icon displayed in the widget on the card. icons can be only one of the following:
knownIcon	string Display one of the built-in icons provided by Google Workspace. For example, to display an airplane icon, specify AIRPLANE. For a bus, specify BUS. For a full list of supported icons, see built-in icons.
iconUrl	string Display a custom icon hosted at an HTTPS URL. For example: "iconUrl": "https://developers.google.com/chat/images/quickstart-app-avatar.png" Supported file types include .png and .jpg.

Button

A text, icon, or text and icon button that users can click. For an example in Google Chat apps, see Button list.

To make an image a clickable button, specify an Image (not an ImageComponent) and set an onClick action.

JSON representation
{ "text": string, "icon": { object (Icon) }, "color": { object (Color) }, "onClick": { object (OnClick) }, "disabled": boolean, "altText": string }

Fields
text	string The text displayed inside the button.
icon	object (Icon) The icon image. If both icon and text are set, then the icon appears before the text.
color	object (Color) If set, the button is filled with a solid background color and the font color changes to maintain contrast with the background color. For example, setting a blue background likely results in white text. If unset, the image background is white and the font color is blue. For red, green, and blue, the value of each field is a float number that you can express in either of two ways: as a number between 0 and 255 divided by 255 (153/255), or as a value between 0 and 1 (0.6). 0 represents the absence of a color and 1 or 255/255 represent the full presence of that color on the RGB scale. Optionally set alpha, which sets a level of transparency using this equation: pixel color = alpha * (this color) + (1.0 - alpha) * (background color) For alpha, a value of 1 corresponds with a solid color, and a value of 0 corresponds with a completely transparent color. For example, the following color represents a half transparent red: "color": { "red": 1, "green": 0, "blue": 0, "alpha": 0.5 }
onClick	object (OnClick) Required. The action to perform when a user clicks the button, such as opening a hyperlink or running a custom function.
disabled	boolean If true, the button is displayed in an inactive state and doesn't respond to user actions.
altText	string The alternative text that's used for accessibility. Set descriptive text that lets users know what the button does. For example, if a button opens a hyperlink, you might write: "Opens a new browser tab and navigates to the Google Chat developer documentation at https://developers.google.com/chat".

Color

Represents a color in the RGBA color space. This representation is designed for simplicity of conversion to and from color representations in various languages over compactness. For example, the fields of this representation can be trivially provided to the constructor of java.awt.Color in Java; it can also be trivially provided to UIColor's +colorWithRed:green:blue:alpha method in iOS; and, with just a little work, it can be easily formatted into a CSS rgba() string in JavaScript.

This reference page doesn't have information about the absolute color space that should be used to interpret the RGB value—for example, sRGB, Adobe RGB, DCI-P3, and BT.2020. By default, applications should assume the sRGB color space.

When color equality needs to be decided, implementations, unless documented otherwise, treat two colors as equal if all their red, green, blue, and alpha values each differ by at most 1e-5.

Example (Java):

 import com.google.type.Color;

 // ...
 public static java.awt.Color fromProto(Color protocolor) {
   float alpha = protocolor.hasAlpha()
       ? protocolor.getAlpha().getValue()
       : 1.0;

   return new java.awt.Color(
       protocolor.getRed(),
       protocolor.getGreen(),
       protocolor.getBlue(),
       alpha);
 }

 public static Color toProto(java.awt.Color color) {
   float red = (float) color.getRed();
   float green = (float) color.getGreen();
   float blue = (float) color.getBlue();
   float denominator = 255.0;
   Color.Builder resultBuilder =
       Color
           .newBuilder()
           .setRed(red / denominator)
           .setGreen(green / denominator)
           .setBlue(blue / denominator);
   int alpha = color.getAlpha();
   if (alpha != 255) {
     result.setAlpha(
         FloatValue
             .newBuilder()
             .setValue(((float) alpha) / denominator)
             .build());
   }
   return resultBuilder.build();
 }
 // ...

Example (iOS / Obj-C):

 // ...
 static UIColor* fromProto(Color* protocolor) {
    float red = [protocolor red];
    float green = [protocolor green];
    float blue = [protocolor blue];
    FloatValue* alpha_wrapper = [protocolor alpha];
    float alpha = 1.0;
    if (alpha_wrapper != nil) {
      alpha = [alpha_wrapper value];
    }
    return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
 }

 static Color* toProto(UIColor* color) {
     CGFloat red, green, blue, alpha;
     if (![color getRed:&red green:&green blue:&blue alpha:&alpha]) {
       return nil;
     }
     Color* result = [[Color alloc] init];
     [result setRed:red];
     [result setGreen:green];
     [result setBlue:blue];
     if (alpha <= 0.9999) {
       [result setAlpha:floatWrapperWithValue(alpha)];
     }
     [result autorelease];
     return result;
}
// ...

Example (JavaScript):

// ...

var protoToCssColor = function(rgb_color) {
   var redFrac = rgb_color.red || 0.0;
   var greenFrac = rgb_color.green || 0.0;
   var blueFrac = rgb_color.blue || 0.0;
   var red = Math.floor(redFrac * 255);
   var green = Math.floor(greenFrac * 255);
   var blue = Math.floor(blueFrac * 255);

   if (!('alpha' in rgb_color)) {
      return rgbToCssColor(red, green, blue);
   }

   var alphaFrac = rgb_color.alpha.value || 0.0;
   var rgbParams = [red, green, blue].join(',');
   return ['rgba(', rgbParams, ',', alphaFrac, ')'].join('');
};

var rgbToCssColor = function(red, green, blue) {
  var rgbNumber = new Number((red << 16) | (green << 8) | blue);
  var hexString = rgbNumber.toString(16);
  var missingZeros = 6 - hexString.length;
  var resultBuilder = ['#'];
  for (var i = 0; i < missingZeros; i++) {
     resultBuilder.push('0');
  }
  resultBuilder.push(hexString);
  return resultBuilder.join('');
};

// ...

JSON representation
{ "red": number, "green": number, "blue": number, "alpha": number }

Fields
red	number The amount of red in the color as a value in the interval [0, 1].
green	number The amount of green in the color as a value in the interval [0, 1].
blue	number The amount of blue in the color as a value in the interval [0, 1].
alpha	number The fraction of this color that should be applied to the pixel. That is, the final pixel color is defined by the equation: pixel color = alpha * (this color) + (1.0 - alpha) * (background color) This means that a value of 1.0 corresponds to a solid color, whereas a value of 0.0 corresponds to a completely transparent color. This uses a wrapper message rather than a simple float scalar so that it is possible to distinguish between a default value and the value being unset. If omitted, this color object is rendered as a solid color (as if the alpha value had been explicitly given a value of 1.0).

SwitchControl

Either a toggle-style switch or a checkbox inside a decoratedText widget.

Only supported in the decoratedText widget.

JSON representation
{ "name": string, "value": string, "selected": boolean, "onChangeAction": { object (Action) }, "controlType": enum (ControlType) }

Fields
name	string The name by which the switch widget is identified in a form input event. For details about working with form inputs, see Receive form data.
value	string The value entered by a user, returned as part of a form input event. For details about working with form inputs, see Receive form data.
selected	boolean When true, the switch is selected.
onChangeAction	object (Action) The action to perform when the switch state is changed, such as what function to run.
controlType	enum (ControlType) How the switch appears in the user interface.

ControlType

How the switch appears in the user interface.

Enums
SWITCH	A toggle-style switch.
CHECKBOX	Deprecated in favor of CHECK_BOX.
CHECK_BOX	A checkbox.

ButtonList

A list of buttons layed out horizontally. For an example in Google Chat apps, see Button list.

JSON representation
{ "buttons": [ { object (Button) } ] }

Fields
buttons[]	object (Button) An array of buttons.

TextInput

A field in which users can enter text. Supports suggestions and on-change actions. For an example in Google Chat apps, see Text input.

Chat apps receive and can process the value of entered text during form input events. For details about working with form inputs, see Receive form data.

When you need to collect undefined or abstract data from users, use a text input. To collect defined or enumerated data from users, use the SelectionInput widget.

JSON representation
{ "name": string, "label": string, "hintText": string, "value": string, "type": enum (Type), "onChangeAction": { object (Action) }, "initialSuggestions": { object (Suggestions) }, "autoCompleteAction": { object (Action) }, "placeholderText": string }

Fields
name	string The name by which the text input is identified in a form input event. For details about working with form inputs, see Receive form data.
label	string The text that appears above the text input field in the user interface. Specify text that helps the user enter the information your app needs. For example, if you are asking someone's name, but specifically need their surname, write surname instead of name. Required if hintText is unspecified. Otherwise, optional.
hintText	string Text that appears below the text input field meant to assist users by prompting them to enter a certain value. This text is always visible. Required if label is unspecified. Otherwise, optional.
value	string The value entered by a user, returned as part of a form input event. For details about working with form inputs, see Receive form data.
type	enum (Type) How a text input field appears in the user interface. For example, whether the field is single or multi-line.
onChangeAction	object (Action) What to do when a change occurs in the text input field. For example, a user adding to the field or deleting text. Examples of actions to take include running a custom function or opening a dialog in Google Chat.
initialSuggestions	object (Suggestions) Suggested values that users can enter. These values appear when users click inside the text input field. As users type, the suggested values dynamically filter to match what the users have typed. For example, a text input field for programming language might suggest Java, JavaScript, Python, and C++. When users start typing Jav, the list of suggestions filters to show just Java and JavaScript. Suggested values help guide users to enter values that your app can make sense of. When referring to JavaScript, some users might enter javascript and others java script. Suggesting JavaScript can standardize how users interact with your app. When specified, TextInput.type is always SINGLE_LINE, even if it's set to MULTIPLE_LINE.
autoCompleteAction	object (Action) Optional. Specify what action to take when the text input field provides suggestions to users who interact with it. If unspecified, the suggestions are set by initialSuggestions and are processed by the client. If specified, the app takes the action specified here, such as running a custom function. Supported by Google Workspace Add-ons, but not Google Chat apps.
placeholderText	string Text that appears in the text input field when the field is empty. Use this text to prompt users to enter a value. For example, Enter a number from 0 to 100. Supported by Google Chat apps, but not Google Workspace Add-ons.

Type

How a text input field appears in the user interface. For example, whether it's a single line input field, or a multi-line input.

If initialSuggestions is specified, type is always SINGLE_LINE, even if it's set to MULTIPLE_LINE.

Enums
SINGLE_LINE	The text input field has a fixed height of one line.
MULTIPLE_LINE	The text input field has a fixed height of multiple lines.

RenderActions

A set of render instructions that tells a card to perform an action, or tells the add-on host app or the Chat app to perform an app-specific action.

Fields
action	Action

Action

Fields
navigations[]	Navigation Push or update displayed cards.

Navigation

Add a new card to the stack (navigate forward).

navigations: {
  pushCard: CARD
}

Replace the top card with a new card.

navigations: {
  updateCard: CARD
}

Fields
Union field navigate_action. navigate_action can be only one of the following:
pushCard	Card Card stack pushes a card onto the card stack.
updateCard	Card Card stack updates the top card with a new card and preserves filled form fields values. For a non-equivalent field, the value is dropped.

Suggestions

Suggested values that users can enter. These values appear when users click inside the text input field. As users type, the suggested values dynamically filter to match what the users have typed.

For example, a text input field for programming language might suggest Java, JavaScript, Python, and C++. When users start typing Jav, the list of suggestions filters to show Java and JavaScript.

Suggested values help guide users to enter values that your app can make sense of. When referring to JavaScript, some users might enter javascript and others java script. Suggesting JavaScript can standardize how users interact with your app.

When specified, TextInput.type is always SINGLE_LINE, even if it's set to MULTIPLE_LINE.

JSON representation
{ "items": [ { object (SuggestionItem) } ] }

Fields
items[]	object (SuggestionItem) A list of suggestions used for autocomplete recommendations in text input fields.

SuggestionItem

One suggested value that users can enter in a text input field.

JSON representation
{ // Union field content can be only one of the following: "text": string // End of list of possible types for union field content. }

Fields
Union field content. content can be only one of the following:
text	string The value of a suggested input to a text input field. This is equivalent to what users enter themselves.

SelectionInput

A widget that creates one or more UI items that users can select. For example, a dropdown menu or checkboxes. You can use this widget to collect data that can be predicted or enumerated. For an example in Google Chat apps, see Selection input.

Chat apps can process the value of items that users select or input. For details about working with form inputs, see Receive form data.

To collect undefined or abstract data from users, use the TextInput widget.

JSON representation

{ "name": string, "label": string, "type": enum (SelectionType), "items": [ { object (SelectionItem) } ], "onChangeAction": { object (Action) }, "multiSelectMaxSelectedItems": integer, "multiSelectMinQueryLength": integer, // Union field multi_select_data_source can be only one of the following: "externalDataSource": { object (Action) }, "platformDataSource": { object (PlatformDataSource) } // End of list of possible types for union field multi_select_data_source. }

Fields
name	string The name that identifies the selection input in a form input event. For details about working with form inputs, see Receive form data.
label	string The text that appears above the selection input field in the user interface. Specify text that helps the user enter the information your app needs. For example, if users are selecting the urgency of a work ticket from a drop-down menu, the label might be "Urgency" or "Select urgency".
type	enum (SelectionType) The type of items that are displayed to users in a SelectionInput widget. Selection types support different types of interactions. For example, users can select one or more checkboxes, but they can only select one value from a dropdown menu.
items[]	object (SelectionItem) An array of selectable items. For example, an array of radio buttons or checkboxes. Supports up to 100 items.
onChangeAction	object (Action) If specified, the form is submitted when the selection changes. If not specified, you must specify a separate button that submits the form. For details about working with form inputs, see Receive form data.
multiSelectMaxSelectedItems	integer For multiselect menus, the maximum number of items that a user can select. Minimum value is 1 item. If unspecified, defaults to 3 items.
multiSelectMinQueryLength	integer For multiselect menus, the number of text characters that a user inputs before the Chat app queries autocomplete and displays suggested items in the menu. If unspecified, defaults to 0 characters for static data sources and 3 characters for external data sources.
Union field multi_select_data_source. Chat apps only. For a multiselect menu, the data source that populates selection items. multi_select_data_source can be only one of the following:
externalDataSource	object (Action) An external data source, such as a relational data base.
platformDataSource	object (PlatformDataSource) A data source from Google Workspace.

SelectionType

The format for the items that users can select. Different options support different types of interactions. For example, users can select multiple checkboxes, but can only select one item from a dropdown menu.

Each selection input supports one type of selection. Mixing checkboxes and switches, for example, isn't supported.

Enums
CHECK_BOX	A set of checkboxes. Users can select one or more checkboxes.
RADIO_BUTTON	A set of radio buttons. Users can select one radio button.
SWITCH	A set of switches. Users can turn on one or more switches.
DROPDOWN	A dropdown menu. Users can select one item from the menu.
MULTI_SELECT	Supported by Chat apps, but not Google Workspace Add-ons. A multiselect menu for static or dynamic data. From the menu bar, users select one or more items. Users can also input values to populate dynamic data. For example, users can start typing the name of a Google Chat space and the widget autosuggests the space. To populate items for a multiselect menu, you can use one of the following types of data sources: Static data: Items are specified as SelectionItem objects in the widget. Up to 100 items. Google Workspace data: Items are populated using data from Google Workspace, such as Google Workspace users or Google Chat spaces. External data: Items are populated from an external data source outside of Google Workspace. For examples of how to implement multiselect menus, see the SelectionInput widget page .

SelectionItem

An item that users can select in a selection input, such as a checkbox or switch.

JSON representation
{ "text": string, "value": string, "selected": boolean, "startIconUri": string, "bottomText": string }

Fields
text	string The text that identifies or describes the item to users.
value	string The value associated with this item. The client should use this as a form input value. For details about working with form inputs, see Receive form data.
selected	boolean Whether the item is selected by default. If the selection input only accepts one value (such as for radio buttons or a dropdown menu), only set this field for one item.
startIconUri	string For multiselect menus, the URL for the icon displayed next to the item's text field. Supports PNG and JPEG files. Must be an HTTPS URL. For example, https://developers.google.com/chat/images/quickstart-app-avatar.png.
bottomText	string For multiselect menus, a text description or label that's displayed below the item's text field.

PlatformDataSource

Chat apps only. For a SelectionInput widget that uses a multiselect menu, a data source from Google Workspace. Used to populate items in a multiselect menu.

JSON representation
{ // Union field data_source can be only one of the following: "commonDataSource": enum (CommonDataSource), "hostAppDataSource": { object (HostAppDataSourceMarkup) } // End of list of possible types for union field data_source. }

Fields
Union field data_source. The data source. data_source can be only one of the following:
commonDataSource	enum (CommonDataSource) A data source shared by all Google Workspace applications, such as users in a Google Workspace organization.
hostAppDataSource	object (HostAppDataSourceMarkup) A data source that's unique to a Google Workspace host application, such spaces in Google Chat.

CommonDataSource

Chat apps only. A data source shared by all Google Workspace applications.

Enums
UNKNOWN	Default value. Don't use.
USER	Google Workspace users. The user can only view and select users from their Google Workspace organization.

HostAppDataSourceMarkup

Chat apps only. For a SelectionInput widget that uses a multiselect menu, a data source from a Google Workspace application. The data source populates selection items for the multiselect menu.

JSON representation
{ // Union field data_source can be only one of the following: "chatDataSource": { object (ChatClientDataSourceMarkup) } // End of list of possible types for union field data_source. }

Fields
Union field data_source. The Google Workspace application that populates items for a multiselect menu. data_source can be only one of the following:
chatDataSource	object (ChatClientDataSourceMarkup) A data source from Google Chat.

ChatClientDataSourceMarkup

Chat apps only. For a SelectionInput widget that uses a multiselect menu, a data source from Google Chat. The data source populates selection items for the multiselect menu. For example, a user can select Google Chat spaces that they're a member of.

JSON representation
{ // Union field source can be only one of the following: "spaceDataSource": { object (SpaceDataSource) } // End of list of possible types for union field source. }

Fields
Union field source. The Google Chat data source. source can be only one of the following:
spaceDataSource	object (SpaceDataSource) Google Chat spaces that the user is a member of.

SpaceDataSource

A data source that populates Google Chat spaces as selection items for a multiselect menu. Only populates spaces that the user is a member of.

JSON representation
{ "defaultToCurrentSpace": boolean }

Fields
defaultToCurrentSpace	boolean If set to true, the multiselect menu selects the current Google Chat space as an item by default.

DateTimePicker

Lets users input a date, a time, or both a date and a time. For an example in Google Chat apps, see Date time picker.

Users can input text or use the picker to select dates and times. If users input an invalid date or time, the picker shows an error that prompts users to input the information correctly.

JSON representation
{ "name": string, "label": string, "type": enum (DateTimePickerType), "valueMsEpoch": string, "timezoneOffsetDate": integer, "onChangeAction": { object (Action) } }

Fields
name	string The name by which the DateTimePicker is identified in a form input event. For details about working with form inputs, see Receive form data.
label	string The text that prompts users to input a date, a time, or a date and time. For example, if users are scheduling an appointment, use a label such as Appointment date or Appointment date and time.
type	enum (DateTimePickerType) Whether the widget supports inputting a date, a time, or the date and time.
valueMsEpoch	string (int64 format) The default value displayed in the widget, in milliseconds since Unix epoch time. Specify the value based on the type of picker ( DateTimePickerType): DATE_AND_TIME : a calendar date and time in UTC. For example, to represent January 1, 2023 at 12:00 PM UTC, use 1672574400000. DATE_ONLY : a calendar date at 00:00:00 UTC. For example, to represent January 1, 2023, use 1672531200000. TIME_ONLY : a time in UTC. For example, to represent 12:00 PM, use 43200000 (or 12 * 60 * 60 * 1000).
timezoneOffsetDate	integer The number representing the time zone offset from UTC, in minutes. If set, the valueMsEpoch is displayed in the specified time zone. If unset, the value defaults to the user's time zone setting.
onChangeAction	object (Action) Triggered when the user clicks Save or Clear from the DateTimePicker interface.

DateTimePickerType

The format for the date and time in the DateTimePicker widget. Determines whether users can input a date, a time, or both a date and time.

Enums
DATE_AND_TIME	Users input a date and time.
DATE_ONLY	Users input a date.
TIME_ONLY	Users input a time.

Divider

This type has no fields.

Displays a divider between widgets as a horizontal line. For an example in Google Chat apps, see Divider.

For example, the following JSON creates a divider:

"divider": {}

Grid

Displays a grid with a collection of items. Items can only include text or images. For responsive columns, or to include more than text or images, use Columns. For an example in Google Chat apps, see Grid.

A grid supports any number of columns and items. The number of rows is determined by items divided by columns. A grid with 10 items and 2 columns has 5 rows. A grid with 11 items and 2 columns has 6 rows.

For example, the following JSON creates a 2 column grid with a single item:

"grid": {
  "title": "A fine collection of items",
  "columnCount": 2,
  "borderStyle": {
    "type": "STROKE",
    "cornerRadius": 4
  },
  "items": [
    {
      "image": {
        "imageUri": "https://www.example.com/image.png",
        "cropStyle": {
          "type": "SQUARE"
        },
        "borderStyle": {
          "type": "STROKE"
        }
      },
      "title": "An item",
      "textAlignment": "CENTER"
    }
  ],
  "onClick": {
    "openLink": {
      "url": "https://www.example.com"
    }
  }
}

JSON representation
{ "title": string, "items": [ { object (GridItem) } ], "borderStyle": { object (BorderStyle) }, "columnCount": integer, "onClick": { object (OnClick) } }

Fields
title	string The text that displays in the grid header.
items[]	object (GridItem) The items to display in the grid.
borderStyle	object (BorderStyle) The border style to apply to each grid item.
columnCount	integer The number of columns to display in the grid. A default value is used if this field isn't specified, and that default value is different depending on where the grid is shown (dialog versus companion).
onClick	object (OnClick) This callback is reused by each individual grid item, but with the item's identifier and index in the items list added to the callback's parameters.

GridItem

Represents an item in a grid layout. Items can contain text, an image, or both text and an image.

JSON representation
{ "id": string, "image": { object (ImageComponent) }, "title": string, "subtitle": string, "layout": enum (GridItemLayout) }

Fields
id	string A user-specified identifier for this grid item. This identifier is returned in the parent grid's onClick callback parameters.
image	object (ImageComponent) The image that displays in the grid item.
title	string The grid item's title.
subtitle	string The grid item's subtitle.
layout	enum (GridItemLayout) The layout to use for the grid item.

ImageComponent

Represents an image.

JSON representation
{ "imageUri": string, "altText": string, "cropStyle": { object (ImageCropStyle) }, "borderStyle": { object (BorderStyle) } }

Fields
imageUri	string The image URL.
altText	string The accessibility label for the image.
cropStyle	object (ImageCropStyle) The crop style to apply to the image.
borderStyle	object (BorderStyle) The border style to apply to the image.

ImageCropStyle

Represents the crop style applied to an image.

For example, here's how to apply a 16:9 aspect ratio:

cropStyle {
 "type": "RECTANGLE_CUSTOM",
 "aspectRatio": 16/9
}

JSON representation
{ "type": enum (ImageCropType), "aspectRatio": number }

Fields
type	enum (ImageCropType) The crop type.
aspectRatio	number The aspect ratio to use if the crop type is RECTANGLE_CUSTOM. For example, here's how to apply a 16:9 aspect ratio: cropStyle { "type": "RECTANGLE_CUSTOM", "aspectRatio": 16/9 }

ImageCropType

Represents the crop style applied to an image.

Enums
IMAGE_CROP_TYPE_UNSPECIFIED	Don't use. Unspecified.
SQUARE	Default value. Applies a square crop.
CIRCLE	Applies a circular crop.
RECTANGLE_CUSTOM	Applies a rectangular crop with a custom aspect ratio. Set the custom aspect ratio with aspectRatio.
RECTANGLE_4_3	Applies a rectangular crop with a 4:3 aspect ratio.

BorderStyle

The style options for the border of a card or widget, including the border type and color.

JSON representation
{ "type": enum (BorderType), "strokeColor": { object (Color) }, "cornerRadius": integer }

Fields
type	enum (BorderType) The border type.
strokeColor	object (Color) The colors to use when the type is BORDER_TYPE_STROKE.
cornerRadius	integer The corner radius for the border.

BorderType

Represents the border types applied to widgets.

Enums
BORDER_TYPE_UNSPECIFIED	Don't use. Unspecified.
NO_BORDER	Default value. No border.
STROKE	Outline.

GridItemLayout

Represents the various layout options available for a grid item.

Enums
GRID_ITEM_LAYOUT_UNSPECIFIED	Don't use. Unspecified.
TEXT_BELOW	The title and subtitle are shown below the grid item's image.
TEXT_ABOVE	The title and subtitle are shown above the grid item's image.

Columns

The Columns widget displays up to 2 columns in a card message or dialog. You can add widgets to each column; the widgets appear in the order that they are specified. For an example in Google Chat apps, see Columns.

The height of each column is determined by the taller column. For example, if the first column is taller than the second column, both columns have the height of the first column. Because each column can contain a different number of widgets, you can't define rows or align widgets between the columns.

Columns are displayed side-by-side. You can customize the width of each column using the HorizontalSizeStyle field. If the user's screen width is too narrow, the second column wraps below the first:

• On web, the second column wraps if the screen width is less than or equal to 480 pixels.
• On iOS devices, the second column wraps if the screen width is less than or equal to 300 pt.
• On Android devices, the second column wraps if the screen width is less than or equal to 320 dp.

To include more than 2 columns, or to use rows, use the Grid widget.

Supported by Chat apps, but not Google Workspace Add-ons.

JSON representation
{ "columnItems": [ { object (Column) } ] }

Fields
columnItems[]	object (Column) An array of columns. You can include up to 2 columns in a card or dialog.

Column

A column.

JSON representation
{ "horizontalSizeStyle": enum (HorizontalSizeStyle), "horizontalAlignment": enum (HorizontalAlignment), "verticalAlignment": enum (VerticalAlignment), "widgets": [ { object (Widgets) } ] }

Fields
horizontalSizeStyle	enum (HorizontalSizeStyle) Specifies how a column fills the width of the card.
horizontalAlignment	enum (HorizontalAlignment) Specifies whether widgets align to the left, right, or center of a column.
verticalAlignment	enum (VerticalAlignment) Specifies whether widgets align to the top, bottom, or center of a column.
widgets[]	object (Widgets) An array of widgets included in a column. Widgets appear in the order that they are specified.

HorizontalSizeStyle

Specifies how a column fills the width of the card. The width of each column depends on both the HorizontalSizeStyle and the width of the widgets within the column.

Enums
HORIZONTAL_SIZE_STYLE_UNSPECIFIED	Don't use. Unspecified.
FILL_AVAILABLE_SPACE	Default value. Column fills the available space, up to 70% of the card's width. If both columns are set to FILL_AVAILABLE_SPACE, each column fills 50% of the space.
FILL_MINIMUM_SPACE	Column fills the least amount of space possible and no more than 30% of the card's width.

HorizontalAlignment

Specifies whether widgets align to the left, right, or center of a column.

Enums
HORIZONTAL_ALIGNMENT_UNSPECIFIED	Don't use. Unspecified.
START	Default value. Aligns widgets to the start position of the column. For left-to-right layouts, aligns to the left. For right-to-left layouts, aligns to the right.
CENTER	Aligns widgets to the center of the column.
END	Aligns widgets to the end position of the column. For left-to-right layouts, aligns widgets to the right. For right-to-left layouts, aligns widgets to the left.

VerticalAlignment

Specifies whether widgets align to the top, bottom, or center of a column.

Enums
VERTICAL_ALIGNMENT_UNSPECIFIED	Don't use. Unspecified.
CENTER	Default value. Aligns widgets to the center of a column.
TOP	Aligns widgets to the top of a column.
BOTTOM	Aligns widgets to the bottom of a column.

Widgets

The supported widgets that you can include in a column.

JSON representation

{ // Union field data can be only one of the following: "textParagraph": { object (TextParagraph) }, "image": { object (Image) }, "decoratedText": { object (DecoratedText) }, "buttonList": { object (ButtonList) }, "textInput": { object (TextInput) }, "selectionInput": { object (SelectionInput) }, "dateTimePicker": { object (DateTimePicker) } // End of list of possible types for union field data. }

Fields
Union field data. data can be only one of the following:
textParagraph	object (TextParagraph) TextParagraph widget.
image	object (Image) Image widget.
decoratedText	object (DecoratedText) DecoratedText widget.
buttonList	object (ButtonList) ButtonList widget.
textInput	object (TextInput) TextInput widget.
selectionInput	object (SelectionInput) SelectionInput widget.
dateTimePicker	object (DateTimePicker) DateTimePicker widget.

DividerStyle

The divider style of a card. Currently only used for dividers betweens card sections.

Enums
DIVIDER_STYLE_UNSPECIFIED	Don't use. Unspecified.
SOLID_DIVIDER	Default option. Render a solid divider between sections.
NO_DIVIDER	If set, no divider is rendered between sections.

CardAction

A card action is the action associated with the card. For example, an invoice card might include actions such as delete invoice, email invoice, or open the invoice in a browser.

Not supported by Chat apps.

JSON representation
{ "actionLabel": string, "onClick": { object (OnClick) } }

Fields
actionLabel	string The label that displays as the action menu item.
onClick	object (OnClick) The onClick action for this action item.

CardFixedFooter

A persistent (sticky) footer that that appears at the bottom of the card. For an example in Google Chat apps, see Card footer.

Setting fixedFooter without specifying a primaryButton or a secondaryButton causes an error.

Supported by Google Workspace Add-ons and Chat apps. For Chat apps, you can use fixed footers in dialogs, but not card messages.

JSON representation
{ "primaryButton": { object (Button) }, "secondaryButton": { object (Button) } }

Fields
primaryButton	object (Button) The primary button of the fixed footer. The button must be a text button with text and color set.
secondaryButton	object (Button) The secondary button of the fixed footer. The button must be a text button with text and color set. If secondaryButton is set, you must also set primaryButton.

DisplayStyle

In Google Workspace Add-ons, determines how a card is displayed.

Not supported by Chat apps.

Enums
DISPLAY_STYLE_UNSPECIFIED	Don't use. Unspecified.
PEEK	The header of the card appears at the bottom of the sidebar, partially covering the current top card of the stack. Clicking the header pops the card into the card stack. If the card has no header, a generated header is used instead.
REPLACE	Default value. The card is shown by replacing the view of the top card in the card stack.