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      1 // Copyright (c) 2012 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 // Global variables only exist for the life of the page, so they get reset
      6 // each time the page is unloaded.
      7 var counter = 1;
      8 
      9 var lastTabId = -1;
     10 function sendMessage() {
     11   chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
     12     lastTabId = tabs[0].id;
     13     chrome.tabs.sendMessage(lastTabId, "Background page started.");
     14   });
     15 }
     16 
     17 sendMessage();
     18 chrome.browserAction.setBadgeText({text: "ON"});
     19 console.log("Loaded.");
     20 
     21 chrome.runtime.onInstalled.addListener(function() {
     22   console.log("Installed.");
     23 
     24   // localStorage is persisted, so it's a good place to keep state that you
     25   // need to persist across page reloads.
     26   localStorage.counter = 1;
     27 
     28   // Register a webRequest rule to redirect bing to google.
     29   var wr = chrome.declarativeWebRequest;
     30   chrome.declarativeWebRequest.onRequest.addRules([{
     31     id: "0",
     32     conditions: [new wr.RequestMatcher({url: {hostSuffix: "bing.com"}})],
     33     actions: [new wr.RedirectRequest({redirectUrl: "http://google.com"})]
     34   }]);
     35 });
     36 
     37 chrome.bookmarks.onRemoved.addListener(function(id, info) {
     38   alert("I never liked that site anyway.");
     39 });
     40 
     41 chrome.browserAction.onClicked.addListener(function() {
     42   // The event page will unload after handling this event (assuming nothing
     43   // else is keeping it awake). The content script will become the main way to
     44   // interact with us.
     45   chrome.tabs.create({url: "http://google.com"}, function(tab) {
     46     chrome.tabs.executeScript(tab.id, {file: "content.js"}, function() {
     47       // Note: we also sent a message above, upon loading the event page,
     48       // but the content script will not be loaded at that point, so we send
     49       // another here.
     50       sendMessage();
     51     });
     52   });
     53 });
     54 
     55 chrome.commands.onCommand.addListener(function(command) {
     56   chrome.tabs.create({url: "http://www.google.com/"});
     57 });
     58 
     59 chrome.runtime.onMessage.addListener(function(msg, _, sendResponse) {
     60   if (msg.setAlarm) {
     61     // For testing only.  delayInMinutes will be rounded up to at least 1 in a
     62     // packed or released extension.
     63     chrome.alarms.create({delayInMinutes: 0.1});
     64   } else if (msg.delayedResponse) {
     65     // Note: setTimeout itself does NOT keep the page awake. We return true
     66     // from the onMessage event handler, which keeps the message channel open -
     67     // in turn keeping the event page awake - until we call sendResponse.
     68     setTimeout(function() {
     69       sendResponse("Got your message.");
     70     }, 5000);
     71     return true;
     72   } else if (msg.getCounters) {
     73     sendResponse({counter: counter++,
     74                   persistentCounter: localStorage.counter++});
     75   }
     76   // If we don't return anything, the message channel will close, regardless
     77   // of whether we called sendResponse.
     78 });
     79 
     80 chrome.alarms.onAlarm.addListener(function() {
     81   alert("Time's up!");
     82 });
     83 
     84 chrome.runtime.onSuspend.addListener(function() {
     85   chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
     86     // After the unload event listener runs, the page will unload, so any
     87     // asynchronous callbacks will not fire.
     88     alert("This does not show up.");
     89   });
     90   console.log("Unloading.");
     91   chrome.browserAction.setBadgeText({text: ""});
     92   chrome.tabs.sendMessage(lastTabId, "Background page unloaded.");
     93 });
     94