menus 编辑

Add items to the browser's menu system.

This API is modeled on Chrome's "contextMenus" API, which enables Chrome extensions to add items to the browser's context menu. The browser.menus API adds a few features to Chrome's API.

Before Firefox 55 this API was also originally named contextMenus, and that name has been retained as an alias, so you can use contextMenus to write code that works in Firefox and also in other browsers.

To use this API you need to have the menus  permission. You may also use the contextMenus alias instead of menus, but if you do, the APIs must be accessed as browser.contextMenus instead.

Except for menus.getTargetElement(), this API cannot be used from content scripts.

Creating menu items

To create a menu item call the menus.create() method. You pass this method an object containing options for the item, including the item ID, item type, and the contexts in which it should be shown.

Listen for clicks on your menu item by adding a listener to the menus.onClicked event. This listener will be passed a menus.OnClickData object containing the event's details.

You can create four different types of menu item, based on the value of the type property you supply in the options to create():

• "normal": a menu item that just displays a label
• "checkbox": a menu item that represents a binary state. It displays a checkmark next to the label. Clicking the item toggles the checkmark. The click listener will be passed two extra properties: "checked", indicating whether the item is checked now, and "wasChecked", indicating whether the item was checked before the click event.
• "radio": a menu item that represents one of a group of choices. Just like a checkbox, this also displays a checkmark next to the label, and its click listener is passed "checked" and "wasChecked". However, if you create more than one radio item, then the items function as a group of radio items: only one item in the group can be checked, and clicking an item makes it the checked item.
• "separator": a line separating a group of items.

If you have created more than one context menu item or more than one tools menu item, then the items will be placed in a submenu. The submenu's parent will be labeled with the name of the extension. For example, here's an extension called "Menu demo" that's added two context menu items:

Icons

If you've specified icons for your extension using the "icons" manifest key, your menu item will display the specified icon next to its label. The browser will try to choose a 16x16 pixel icon for a normal display or a 32x32 pixel icon for a high-density display:

Only for items in a submenu, you can specify custom icons by passing the icons option to menus.create():

Example

Here's a context menu containing 4 items: a normal item, two radio items with separators on each side, and a checkbox. The radio items are given custom icons.

You could create a submenu like this using code like:

browser.menus.create({
  id: "remove-me",
  title: browser.i18n.getMessage("menuItemRemoveMe"),
  contexts: ["all"]
}, onCreated);

browser.menus.create({
  id: "separator-1",
  type: "separator",
  contexts: ["all"]
}, onCreated);

browser.menus.create({
  id: "greenify",
  type: "radio",
  title: browser.i18n.getMessage("menuItemGreenify"),
  contexts: ["all"],
  checked: true,
  icons: {
    "16": "icons/paint-green-16.png",
    "32": "icons/paint-green-32.png"
  }
}, onCreated);

browser.menus.create({
  id: "bluify",
  type: "radio",
  title: browser.i18n.getMessage("menuItemBluify"),
  contexts: ["all"],
  checked: false,
  icons: {
    "16": "icons/paint-blue-16.png",
    "32": "icons/paint-blue-32.png"
  }
}, onCreated);

browser.menus.create({
  id: "separator-2",
  type: "separator",
  contexts: ["all"]
}, onCreated);

var checkedState = true;

browser.menus.create({
  id: "check-uncheck",
  type: "checkbox",
  title: browser.i18n.getMessage("menuItemUncheckMe"),
  contexts: ["all"],
  checked: checkedState
}, onCreated);

Types

menus.ContextType

The different contexts a menu can appear in.

menus.ItemType

The type of menu item: "normal", "checkbox", "radio", "separator".

menus.OnClickData

Information sent when a menu item is clicked.

Properties

menus.ACTION_MENU_TOP_LEVEL_LIMIT

The maximum number of top level extension items that can be added to a menu item whose ContextType is "browser_action" or "page_action".

Functions

menus.create()

Creates a new menu item.

menus.getTargetElement()

Returns the element for a given info.targetElementId.

menus.overrideContext()

Hide all default Firefox menu items in favor of providing a custom context menu UI.

menus.refresh()

Update a menu that's currently being displayed.

menus.remove()

Removes a menu item.

menus.removeAll()

Removes all menu items added by this extension.

menus.update()

Updates a previously created menu item.

Events

menus.onClicked

Fired when a menu item is clicked.

menus.onHidden

Fired when the browser hides a menu.

menus.onShown

Fired when the browser shows a menu.

Browser compatibility

BCD tables only load in the browser

Example extensions

• menu-accesskey-visible
• menu-demo
• menu-labelled-open
• menu-remove-element
• menu-search
• session-state

This API is based on Chromium's chrome.contextMenus API. This documentation is derived from context_menus.json in the Chromium code.

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