我如何观察Firefox扩展中指定的Firefox事件？ [英] How can i observe a specified Firefox event in a Firefox-Extension?
问题描述
我想等待Firefox-Browser-Events（ sessionstore-windows-restored ， user-interaction-inactive ，..）以清除历史。我的扩展程序现在可以清除历史记录，但是我不知道如何收听这些事件。我已经在观察员通知上得到了一些信息，但我没有尝试过似乎有效的方法。
到目前为止，我的扩展代码在这里：
（function（）{
$ {
this.register（）;
$ mybserver $ function $
init：function（）
{
try {
myObserver.prototype = {
观察：函数（主题，主题，数据）{
$ b $ switch（topic）{
case'sessionstore-windows-restored'：
Firebug.Console.log（'sessionstore-windows-restored observed'）;
myObj。 clearHistory（）;
break;
case'user-interaction-inactive'：
Firebug.Console.log（用户交互惰性）;
break;
case'user-interaction-active'：
Firebug.Console.log（'user-interaction-active'）;
break;
Firebug.Console.log（'HUI：'+ subject +'，'+ topic +'，'+ data）;
}，
寄存器：函数（）{
变种observerService = Components.classes [@ mozilla.org/observer-service;1\"].getService(Components.interfaces.nsIObserverService）;
observerService.addObserver（this，readyToClearHistory，false）;
}，
注销：函数（）{
变种observerService = Components.classes [@ mozilla.org/observer-service;1\"].getService(Components.interfaces.nsIObserverService）;
observerService.removeObserver（this，readyToClearHistory）;
$ b catch（e）{
Firebug.Console.log（'MIST：'+ e）;
}
observer = new myObserver（）;
}，
clearHistory：函数（）{
变种globalHistory = Components.classes [@ mozilla.org/browser/global-history;2\"].getService(Components.interfaces.nsIBrowserHistory ）;
var now = Date.now（）;
//清除一小时
globalHistory.removeVisitsByTimeframe（now - 3600，now）;
尝试{
var os = Components.classes [@ mozilla.org/observer-service;1\"].getService(Components.interfaces.nsIObserverService）;
os.notifyObservers（null，browser：purge-session-history，）;
catch（e）{
//清除Open Web Location对话框的最后一个URL
var prefs = Components.classes [@ mozilla.org/喜好服务; 1\" ]的getService（Components.interfaces.nsIPrefBranch2）;
尝试{
prefs.clearUserPref（general.open_location.last_url）;
catch（e）{
}
}
}
}
}
一些示例代码会很好。我有什么需要解决这个问题吗？
你的代码是特定于 nsIObserver ，这意味着你的问题可能在别的地方。这个完整的例子工作：
$ $ p $ $ code var var ObserverTest = {
register：function（）{
var observerService = Components.classes [@ mozilla.org/observer-service;1]
.getService（Components.interfaces.nsIObserverService）;
observerService.addObserver（ObserverTest，user-interaction-active，false）;
}，
观察：function（subject，topic，data）{
switch（topic）{
case'sessionstore-windows-restored'：
//做东西
break;
case'user-interaction-inactive'：
// do stuff
break;
case'user-interaction-active'：
//每隔5秒钟，当用户变为活动时立即
alert（active）;
break;
}
}，
unregister：function（）{
var observerService = Components.classes [@ mozilla.org/observer-service;1]
.getService（Components.interfaces.nsIObserverService）;
observerService.removeObserver（ObserverTest，user-interaction-active）;
window.addEventListener（load，ObserverTest.register，false）;
window.addEventListener（unload，ObserverTest.unregister，false）;
一般来说，我觉得第一次尝试使用不熟悉的组件，就像我上面所做的一样，以便我可以将它与特定于应用程序的代码隔离，并验证我是否正确使用它。在我知道它正在工作之前，我不会把它放到更大的应用程序中去。
I want to wait for Firefox-Browser-Events (sessionstore-windows-restored, user-interaction-inactive,..) in order to clear the history. My Extension is able to clear the history on shortcut for now, but i don't know how to listen for such events. I already had a lood at observer notification, but nothing i tried seems to work.
My extension code so far is here:
(function() {
(window.myObj =
{
myObserver : function()
{
this.register();
},
init : function()
{
try {
myObserver.prototype = {
observe: function(subject, topic, data){
switch (topic) {
case 'sessionstore-windows-restored':
Firebug.Console.log('sessionstore-windows-restored observed');
myObj.clearHistory();
break;
case 'user-interaction-inactive':
Firebug.Console.log('user-interaction-inactive');
break;
case 'user-interaction-active':
Firebug.Console.log('user-interaction-active');
break;
}
Firebug.Console.log('HUI :' + subject + ','+topic+','+data);
},
register: function(){
var observerService = Components.classes["@mozilla.org/observer-service;1"].getService(Components.interfaces.nsIObserverService);
observerService.addObserver(this, "readyToClearHistory", false);
},
unregister: function(){
var observerService = Components.classes["@mozilla.org/observer-service;1"].getService(Components.interfaces.nsIObserverService);
observerService.removeObserver(this, "readyToClearHistory");
}
}
}
catch (e) {
Firebug.Console.log('MIST :' + e);
}
observer = new myObserver();
},
clearHistory : function(){
var globalHistory = Components.classes["@mozilla.org/browser/global-history;2"].getService(Components.interfaces.nsIBrowserHistory);
var now = Date.now();
// clear one hour
globalHistory.removeVisitsByTimeframe(now - 3600, now);
try {
var os = Components.classes["@mozilla.org/observer-service;1"].getService(Components.interfaces.nsIObserverService);
os.notifyObservers(null, "browser:purge-session-history", "");
}
catch (e) {
// Clear last URL of the Open Web Location dialog
var prefs = Components.classes["@mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefBranch2);
try {
prefs.clearUserPref("general.open_location.last_url");
}
catch (e) {
}
}
}
}
}
Some example code would be nice. What do i need to solve this issue?
I don't see anything wrong with with the parts of your code that are specific to nsIObserver, which means your problem is likely somewhere else. This complete example works:
var ObserverTest = {
register: function() {
var observerService = Components.classes["@mozilla.org/observer-service;1"]
.getService(Components.interfaces.nsIObserverService);
observerService.addObserver(ObserverTest, "user-interaction-active", false);
},
observe: function(subject, topic, data) {
switch (topic) {
case 'sessionstore-windows-restored':
// do stuff
break;
case 'user-interaction-inactive':
// do stuff
break;
case 'user-interaction-active':
// every 5 seconds and immediately when user becomes active
alert("active");
break;
}
},
unregister: function() {
var observerService = Components.classes["@mozilla.org/observer-service;1"]
.getService(Components.interfaces.nsIObserverService);
observerService.removeObserver(ObserverTest, "user-interaction-active");
}
}
window.addEventListener("load", ObserverTest.register, false);
window.addEventListener("unload", ObserverTest.unregister, false);
In general, I find it helpful to start with something very simple the first time I attempt to use an unfamiliar component, like what I've done above, so that I can isolate it from application-specific code and verify that I'm using it correctly. I don't pull it into the larger application until I know it's working.
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