Firefox扩展观察响应

问题描述

$ b

 class =lang-js prettyprint-override>  //这是goelvivek的一个活动模块8）附加
 exports.main = function（）{
 var httpRequestObserver = 
 {
观察：函数（主题，主题，数据）
 {
 if（topic ==http-on-examine-response）{
 if（console）
 console.log（data）; 
} 
} 
}; 
 var {Cc，Ci，Cr} = require（chrome）; 
 var observer = require（observer-service）; 
 observerService = Components.classes [@ mozilla.org/observer-service;1]。 
 getService（Components.interfaces.nsIObserverService）; 
 observerService.addObserver（httpRequestObserver，http-on-examine-response，false）; 
}; 
  

但行 console.log（data）; 不在控制台日志中打印任何东西。为什么？

解决方案

除了Nickolay提到的问题，观察者需要实现一个 QueryInterface ）函数（通常通过）。下面介绍一下如何使用附加组件SDK：

var {Cc，Ci ，Cr，Cu} =要求（铬）;
var {XPCOMUtils} = Cu.import（resource：//gre/modules/XPCOMUtils.jsm）;
var httpRequestObserver =
{
QueryInterface：XPCOMUtils.generateQI（[Ci.nsIObserver，Ci.nsISupportsWeakReference]），
...
};


但是，由于您已经需要，它会更容易使用它：

var observer = require（observer -服务）;
observer.add（http-on-examine-response，onHttpRequest）;

函数onHttpRequest（主题，数据）
{
...
}


这个方法的缺点是 observer-service 是一个内部包，它的API可能会在将来的附加SDK版本中改变。

I am trying using code

// This is an active module of the goelvivek (8) Add-on
exports.main = function() {
  var httpRequestObserver =  
  {  
    observe: function(subject, topic, data)   
    { 
      if (topic == "http-on-examine-response") {  
        if(console)
          console.log(data);
      }  
    }  
  }; 
  var {Cc, Ci, Cr} = require("chrome");
  var observer = require("observer-service");   
  observerService = Components.classes["@mozilla.org/observer-service;1"].  
    getService(Components.interfaces.nsIObserverService);  
    observerService.addObserver(httpRequestObserver, "http-on-examine-response", false);
};

but line console.log(data); is not printing any thing in console log. why ?

解决方案

In addition to the issue noted by Nickolay, an observer needs to implement a QueryInterface() function (typically by means of XPCOMUtils.generateQI()). Here is how one would do it with the Add-on SDK:

var {Cc, Ci, Cr, Cu} = require("chrome");
var {XPCOMUtils} = Cu.import("resource://gre/modules/XPCOMUtils.jsm");
var httpRequestObserver =
{
  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver, Ci.nsISupportsWeakReference]),
  ...
};

However, since you already require observer-service package, it would be easier to use it:

var observer = require("observer-service");
observer.add("http-on-examine-response", onHttpRequest);

function onHttpRequest(subject, data)
{
  ...
}

The downside of this approach is that observer-service is an internal package and its API might change in future Add-on SDK versions.

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