javascript - Firefox 中的窗口观察者

Question

我正在构建一个我想捕获窗口事件的扩展。我有这个代码： .....................

  function MyWindowObserver() {
    this.observe=function(aSubject, aTopic, aData) {
        if(aSubject.innerWidth!=1536)
            aSubject.close();
    }
}

function myObserver(){}

myObserver.prototype = {
    observe: function(subject, topic, data) {

},
    register: function() {
        var observerService = Components.classes["@mozilla.org/observer-service;1"]
            .getService(Components.interfaces.nsIObserverService);
        observerService.addObserver(this, "http-on-modify-request", false);

    },
    unregister: function() {
        var observerService = Components.classes["@mozilla.org/observer-service;1"]
            .getService(Components.interfaces.nsIObserverService);
        observerService.removeObserver(this, "http-on-modify-request");
    }
}

function installButton()
{
    var id = "button_cs";
    var toolbarId = "nav-bar";

    var toolbar = document.getElementById(toolbarId);

    //add the button at the end of the navigation toolbar
    toolbar.insertItem(id, toolbar.lastChild);
    toolbar.setAttribute("currentset", toolbar.currentSet);
    document.persist(toolbar.id, "currentset");

    //if the navigation toolbar is hidden,
    //show it, so the user can see your button
    toolbar.collapsed = false;
}

function firstRun(extensions) {
    var extension = extensions.get("bak@asda.com");

    if (extension.firstRun) {
        installButton();
    }
}

var myExtension={

    Observers:null,
    prefs:null,
    clock:null,
    prevwidth:null,
    prevon:null,
    BrosNumber:null,

    init:function(){

        if (Application.extensions)
            firstRun(Application.extensions);
        else
            Application.getExtensions(firstRun);

        this.prefs = Components.classes["@mozilla.org/preferences-service;1"]
            .getService(Components.interfaces.nsIPrefService).getBranch("accessibility.");

        this.Observers = new myObserver();

        this.Observers.register();
    }
};

myExtension.init();

window.addEventListener('load', function(win) {
    var observerService = Components.classes["@mozilla.org/observer-service;1"]
        .getService(Components.interfaces.nsIObserverService);
    observerService.addObserver(new MyWindowObserver(), "toplevel-window-ready", false);
},false);

我究竟做错了什么？aSubject 不是最后一个打开的窗口吗？

有任何想法吗？

score 0 · Accepted Answer

这手表http-on-modify-request和toplevel-window-ready。

观察者不是基于每个窗口的。您只需在全球范围内注册它们。

var{interfaces: Ci, utils: Cu} = Components;
Cu.import('resource://gre/modules/Services.jsm');

var observers = {
    httpModReq: {
        observe: function (aSubject, aTopic, aData) {
            console.log('incoming observe httpModReq - aSubject: "' + aSubject + '" | aTopic: "' + aTopic + '" | aData: "' + aData + '"');
            var httpChannel, requestURL;
            httpChannel = subject.QueryInterface(Ci.nsIHttpChannel);
            requestURL = httpChannel.URI.spec;

            if (requestURL.indexOf('google.com') > -1) {
                //they are loading google
                //httpChannel.setRequestHeader('MyCustomRequestHeader', 'hiiii', false);
                /*
                try {
                   var Host = httpChannel.getRequestHeader('Host');
                } catch (ex) {
                   //if doesnt have Host header it throws exception "NS_ERROR_NOT_AVAILABLE"
                    var Host = 'NULL';
                }
                console.log('REQUEST Header "Host" = ' + Host);
                */
            }
        },
        register: function () {
            Services.obs.addObserver(observer.httpModReq, 'http-on-modify-request', false);
        },
        unregister: function () {
            Services.obs.removeObserver(observer.httpModReq, 'http-on-modify-request');
        }
    },
    topWinRdy: {
        observe: function (aSubject, aTopic, aData) {
            console.log('incoming observe topWinRdy - aSubject: "' + aSubject + '" | aTopic: "' + aTopic + '" | aData: "' + aData + '"');
        },
        register: function () {
            Services.obs.addObserver(observer.topWinRdy, 'toplevel-window-ready', false);
        },
        unregister: function () {
            Services.obs.removeObserver(observer.topWinRdy, 'toplevel-window-ready');
        }
    }
};


//run this block to start observing
for (var o in observers) {
    observers[o].register();
}

/*//run this block when you want to remove the observers
for (var o in observers) {
    observers[o].unregister();
}
*/

您可以将其复制粘贴到暂存器中并在环境设置为浏览器的情况下运行它。它会正常工作。

score 0 · Accepted Answer

只是修复@Notidart 代码

const { interfaces: Ci, utils: Cu } = Components;
Cu.import('resource://gre/modules/Services.jsm');
var observers = {
    httpModReq: {
        observe: function (aSubject, aTopic, aData) {
            console.log('incoming observe httpModReq - aSubject: "' + aSubject + '" | aTopic: "' + aTopic + '" | aData: "' + aData + '"');
            var httpChannel, requestURL;
            httpChannel = aSubject.QueryInterface(Ci.nsIHttpChannel);
            requestURL = httpChannel.URI.spec;

            console.log('requestURL', requestURL)
        },
        register: function () {
            Services.obs.addObserver(this, 'http-on-modify-request', false);
        },
        unregister: function () {
            Services.obs.removeObserver(this, 'http-on-modify-request');
        }
    },
    topWinRdy: {
        observe: function (aSubject, aTopic, aData) {
            console.log('incoming observe topWinRdy - aSubject: "' + aSubject + '" | aTopic: "' + aTopic + '" | aData: "' + aData + '"');
        },
        register: function () {
            Services.obs.addObserver(this, 'toplevel-window-ready', false);
        },
        unregister: function () {
            Services.obs.removeObserver(this, 'toplevel-window-ready');
        }
    }
};


//run this block to start observing
for (var o in observers) {
    observers[o].register();
}

示例输出

incoming observe httpModReq - aSubject: "[xpconnect wrapped nsIRequest]" | aTopic: "http-on-modify-request" | aData: "null" userChrome.js:14:21
requestURL https://www.youtube.com/ userChrome.js:19:21
incoming observe httpModReq - aSubject: "[xpconnect wrapped (nsIRequest, nsIHttpChannel)]" | aTopic: "http-on-modify-request" | aData: "null" userChrome.js:14:21
requestURL https://www.youtube.com/ userChrome.js:19:21
incoming observe httpModReq - aSubject: "[xpconnect wrapped nsISupports]" | aTopic: "http-on-modify-request" | aData: "null" userChrome.js:14:21
requestURL http://ocsp.pki.goog/gts1c3 userChrome.js:19:21
incoming observe httpModReq - aSubject: "[xpconnect wrapped nsIHttpChannel]" | aTopic: "http-on-modify-request" | aData: "null" userChrome.js:14:21
requestURL http://ocsp.pki.goog/gts1c3 userChrome.js:19:21
incoming observe httpModReq - aSubject: "[xpconnect wrapped nsISupports]" | aTopic: "http-on-modify-request" | aData: "null" userChrome.js:14:21
requestURL http://ocsp.pki.goog/gts1c3 userChrome.js:19:21
incoming observe httpModReq - aSubject: "[xpconnect wrapped nsIHttpChannel]" | aTopic: "http-on-modify-request" | aData: "null" userChrome.js:14:21
requestURL http://ocsp.pki.goog/gts1c3 userChrome.js:19:21
incoming observe httpModReq - aSubject: "[xpconnect wrapped nsIRequest]" | aTopic: "http-on-modify-request" | aData: "null"

javascript - Firefox 中的窗口观察者

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