chrome/common/extensions/docs/examples/api/pageAction/pageaction_by_url/background.js

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // When the extension is installed or upgraded ...
   6 chrome.runtime.onInstalled.addListener(function() {
   7   // Replace all rules ...
   8   chrome.declarativeContent.onPageChanged.removeRules(undefined, function() {
   9     // With a new rule ...
  10     chrome.declarativeContent.onPageChanged.addRules([
  11       {
  12         // That fires when a page's URL contains a 'g' ...
  13         conditions: [
  14           new chrome.declarativeContent.PageStateMatcher({
  15             pageUrl: { urlContains: 'g' },
  16           })
  17         ],
  18         // And shows the extension's page action.
  19         actions: [ new chrome.declarativeContent.ShowPageAction() ]
  20       }
  21     ]);
  22   });
  23 });