Class Image

A widget that shows a single image.

var image = CardService.newImage().setAltText("A nice image").setImageUrl("https://image.png");

Methods

Method	Return type	Brief description
`setAltText(altText)`	`Image`	Sets the alternative text of the image for accessibility.
`setAuthorizationAction(action)`	`Image`	Sets an authorization action that opens a URL to the authorization flow when the object is clicked.
`setComposeAction(action, composedEmailType)`	`Image`	Sets an action that composes a draft email when the object is clicked.
`setImageUrl(url)`	`Image`	Sets the image to use by providing its URL or data string.
`setOnClickAction(action)`	`Image`	Sets an action that executes when the object is clicked.
`setOnClickOpenLinkAction(action)`	`Image`	Sets an action that opens a URL in a tab when the object is clicked.
`setOpenLink(openLink)`	`Image`	Sets a URL to be opened when the object is clicked.

Detailed documentation

`setAltText(altText)`

Sets the alternative text of the image for accessibility. Required.

Parameters

Name	Type	Description
`altText`	`String`	The alternative text to assign to this image.

Return

Image — This object, for chaining.

`setAuthorizationAction(action)`

Sets an authorization action that opens a URL to the authorization flow when the object is clicked. This opens the URL in a new window. When the user finishes the authorization flow and returns to the application, the add-on reloads.

A UI object can only have one of setOpenLink(openLink), setOnClickAction(action), setOnClickOpenLinkAction(action), setAuthorizationAction(action), or setComposeAction(action, composedEmailType) set.

// ...

var action = CardService.newAuthorizationAction().setAuthorizationUrl('url');
CardService.newTextButton().setText('Authorize').setAuthorizationAction(action);

Parameters

Name	Type	Description
`action`	`AuthorizationAction`	The object that specifies the authorization action to take when this element is clicked.

Return

Image — This object, for chaining.

`setComposeAction(action, composedEmailType)`

Sets an action that composes a draft email when the object is clicked. A UI object can only have one of setOpenLink(openLink), setOnClickAction(action), setOnClickOpenLinkAction(action), setAuthorizationAction(action), or setComposeAction(action, composedEmailType) set.

The Action parameter must specify a callback function that returns a ComposeActionResponse object configured using ComposeActionResponseBuilder.setGmailDraft(draft).

Note: This method doesn't set a compose action that is used to extend the compose UI. Rather, this method connects this UI element to an Action that composes draft messages in Apps Script that are opened in Gmail when the action completes.

// ...

var action = CardService.newAction().setFunctionName('composeEmailCallback');
CardService.newTextButton()
    .setText('Compose Email')
    .setComposeAction(action, CardService.ComposedEmailType.REPLY_AS_DRAFT);

// ...

function composeEmailCallback() {
  var thread = GmailApp.getThreadById(e.threadId);
  var draft = thread.createDraftReply('This is a reply');
  return CardService.newComposeActionResponseBuilder()
      .setGmailDraft(draft)
      .build();
}

Parameters

Name	Type	Description
`action`	`Action`	The object that specifies the compose action to take when this element is clicked.
`composedEmailType`	`ComposedEmailType`	An enum value that specifies whether the composed draft is a standalone or reply draft.

Return

Image — This object, for chaining.

`setImageUrl(url)`

Sets the image to use by providing its URL or data string. Required.

The provided URL can either be a publicly accessible URL or a base64 encoded image string. To obtain the latter, you can use the following code to create an encoded image string from an image in your Google Drive, then store that string for later use with setImageUrl(url). This method prevents the need for your add-on to access a publicly available image URL:

// The following assumes you have the image to use in Google Drive and have its ID.
var imageBytes = DriveApp.getFileById(imageID).getBlob().getBytes();
var encodedImageURL = "data:image/jpeg;base64," + Utilities.base64Encode(imageBytes);

// You can store encodeImageURL and use it as a parameter to Image.setImageUrl(url).

Parameters

Name	Type	Description
`url`	`String`	The URL address of a hosted image to use, or an encoded image string.

Return

Image — This object, for chaining.

`setOnClickAction(action)`

Sets an action that executes when the object is clicked. A UI object can only have one of setOpenLink(openLink), setOnClickAction(action), setOnClickOpenLinkAction(action), setAuthorizationAction(action), or setComposeAction(action, composedEmailType) set.

The Action parameter must specify a callback function that returns a ActionResponse object.

// ...

var action = CardService.newAction().setFunctionName('notificationCallback');
CardService.newTextButton().setText('Create notification').setOnClickAction(action);

// ...

function notificationCallback() {
  return CardService.newActionResponseBuilder()
      .setNotification(CardService.newNotification()
          .setText("Some info to display to user"))
      .build();
}

Parameters

Name	Type	Description
`action`	`Action`	The action to take when this element is clicked.

Return

Image — This object, for chaining.

`setOnClickOpenLinkAction(action)`

Sets an action that opens a URL in a tab when the object is clicked. Use this function when the URL needs to be built or when you need to take other actions in additon to creating the OpenLink object. A UI object can only have one of setOpenLink(openLink), setOnClickAction(action), setOnClickOpenLinkAction(action), setAuthorizationAction(action), or setComposeAction(action, composedEmailType) set.

The Action parameter must specify a callback function that returns a ActionResponse object configured using ActionResponseBuilder.setOpenLink(openLink).

// ...

var action = CardService.newAction().setFunctionName('openLinkCallback');
CardService.newTextButton().setText('Open Link').setOnClickOpenLinkAction(action);

// ...

function openLinkCallback() {
  return CardService.newActionResponseBuilder()
      .setOpenLink(CardService.newOpenLink()
          .setUrl('https://www.google.com'))
      .build();
}

Parameters

Name	Type	Description
`action`	`Action`	The object that specifies the open link action to take when this element is clicked.

Return

Image — This object, for chaining.

`setOpenLink(openLink)`

Sets a URL to be opened when the object is clicked. Use this function when the URL is already known and only needs to be opened. A UI object can only have one of setOpenLink(openLink), setOnClickAction(action), setOnClickOpenLinkAction(action), setAuthorizationAction(action), or setComposeAction(action, composedEmailType) set.

Parameters

Name	Type	Description
`openLink`	`OpenLink`	An `OpenLink` object describing the URL to open.

Return

Image — This object, for chaining.