使用 Action 对象在 Google Workspace 加载项中构建互动行为。
操作对象用于定义当用户与插件界面中的 widget(例如按钮)互动时会发生什么。
为 widget 添加操作
如需将操作附加到 widget,请使用 widget 处理函数,该函数还会定义触发操作的条件。触发后,该操作会执行指定的回调函数。回调函数会收到一个事件对象,其中包含有关用户客户端互动的信息。您必须实现回调函数,并让其返回特定的响应对象。
示例:点击按钮时显示新卡片
如果您想向插件添加一个按钮,该按钮在点击时会构建并显示新卡片,请按以下步骤操作:
- 创建按钮 widget。
- 如需设置卡片构建操作,请添加按钮 widget 处理函数 setOnClickAction(action)。
- 创建一个要执行的 Apps 脚本回调函数,并将其指定为 widget 处理函数中的 (action)。在这种情况下,回调函数应构建所需的卡片并返回ActionResponse对象。响应对象会告知插件显示回调函数构建的卡片。
以下示例展示了如何创建按钮 widget。该操作代表插件请求当前文件的 drive.file 范围。
/** * Adds a section to the Card Builder that displays a "REQUEST PERMISSION" button. * When it's clicked, the callback triggers file scope permission flow. This is used in * the add-on when the home-page displays basic data. */ function addRequestFileScopeButtonToBuilder(cardBuilder) { var buttonSection = CardService.newCardSection(); // If the add-on does not have access permission, add a button that // allows the user to provide that permission on a per-file basis. var buttonAction = CardService.newAction() .setFunctionName("onRequestFileScopeButtonClickedInEditor"); var button = CardService.newTextButton() .setText("Request permission") .setBackgroundColor("#4285f4") .setTextButtonStyle(CardService.TextButtonStyle.FILLED) .setOnClickAction(buttonAction); buttonSection.addWidget(button); cardBuilder.addSection(buttonSection); } /** * Callback function for a button action. Instructs Docs to display a * permissions dialog to the user, requesting `drive.file` scope for the * current file on behalf of this add-on. * * @param {Object} e The parameters object that contains the document’s ID * @return {editorFileScopeActionResponse} */ function onRequestFileScopeButtonClickedInEditor(e) { return CardService.newEditorFileScopeActionResponseBuilder() .requestFileScopeForActiveDocument().build();
REST API 的文件访问互动
扩展编辑器并使用 REST API 的 Google Workspace 加载项可以包含一个额外的 widget 操作来请求文件访问权限。此操作需要关联的操作回调函数返回一个专用响应对象:
| 尝试的操作 | 回调函数应返回 | 
|---|---|
| 为 current_document 请求文件访问权限 | EditorFileScopeActionResponse | 
如需使用此 widget 操作和响应对象,必须满足以下所有条件:
- 该插件使用 REST API。
- 插件使用 CardService.newEditorFileScopeActionResponseBuilder().requestFileScopeForActiveDocument().build();方法显示请求文件范围对话框。
- 该插件在其清单中包含 https://www.googleapis.com/auth/drive.file编辑器范围和onFileScopeGranted触发器。
请求当前文档的文件访问权限
如需为当前文档请求文件访问权限,请按以下步骤操作:
- 构建一个首页卡片,用于检查插件是否具有 drive.file范围。
- 如果插件尚未获得 drive.file范围,请构建一种方式来请求用户为当前文档授予drive.file范围。
示例:在 Google 文档中获取当前文档访问权限
以下示例构建了一个 Google 文档界面,用于显示当前文档的大小。如果该插件没有 drive.file 授权,则会显示一个按钮来启动文件范围授权。
/**
 * Build a simple card that checks selected items' quota usage. Checking
 * quota usage requires user-permissions, so this add-on provides a button
 * to request `drive.file` scope for items the add-on doesn't yet have
 * permission to access.
 *
 * @param e The event object passed containing information about the
 *   current document.
 * @return {Card}
 */
function onDocsHomepage(e) {
  return createAddOnView(e);
}
function onFileScopeGranted(e) {
  return createAddOnView(e);
}
/**
 * For the current document, display either its quota information or
 * a button that allows the user to provide permission to access that
 * file to retrieve its quota details.
 *
 * @param e The event containing information about the current document
 * @return {Card}
 */
function createAddOnView(e) {
  var docsEventObject = e['docs'];
  var builder =  CardService.newCardBuilder();
  var cardSection = CardService.newCardSection();
  if (docsEventObject['addonHasFileScopePermission']) {
    cardSection.setHeader(docsEventObject['title']);
    // This add-on uses the recommended, limited-permission `drive.file`
    // scope to get granular per-file access permissions.
    // See: https://developers.google.com/drive/api/v2/about-auth
    // If the add-on has access permission, read and display its quota.
    cardSection.addWidget(
      CardService.newTextParagraph().setText(
          "This file takes up: " + getQuotaBytesUsed(docsEventObject['id'])));
  } else {
    // If the add-on does not have access permission, add a button that
    // allows the user to provide that permission on a per-file basis.
    cardSection.addWidget(
      CardService.newTextParagraph().setText(
          "The add-on needs permission to access this file's quota."));
    var buttonAction = CardService.newAction()
      .setFunctionName("onRequestFileScopeButtonClicked");
    var button = CardService.newTextButton()
      .setText("Request permission")
      .setOnClickAction(buttonAction);
    cardSection.addWidget(button);
  }
  return builder.addSection(cardSection).build();
}
/**
 * Callback function for a button action. Instructs Docs to display a
 * permissions dialog to the user, requesting `drive.file` scope for the
 * current file on behalf of this add-on.
 *
 * @param {Object} e The parameters object that contains the document’s ID
 * @return {editorFileScopeActionResponse}
 */
function onRequestFileScopeButtonClicked(e) {
  return CardService.newEditorFileScopeActionResponseBuilder()
      .requestFileScopeForActiveDocument().build();
}