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POJava-script, Google chrome extension: Undefined class variable, in method referenced by callback
 

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  1. POJava-script, Google chrome extension: Undefined class variable, in method referenced by callback
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    <p>I am trying to make Google Chrome extension. </p> <p>For the beginning, I want to create javascript class, that represents the active browser tab and let me work with that HTML source. It should be used like this: </p> <pre><code>var currentTab = new CurrentTab(); currentTab.requestHtml(function(html){ // `html` contents active tab HTML }); </code></pre> <p>I googled, and I found that HTML of active tab can't be getted directly to extension's popup. But I can pass my own javascript to tab, that respons his HTML to my extension through <code>chrome.extension.sendRequest()</code>. So, my <code>CurrentTab</code> class look like this: </p> <pre><code>var CurrentTab = function(){ this.listeners = { 'requestHtml': {} }; chrome.extension.onRequest.addListener(this._processListener); }; CurrentTab.prototype = { requestHtml: function(callback){ var actionKey = Math.ceil(Math.random() * 10000); // get random identifier for this callback this.listeners['requestHtml'][actionKey] = callback; chrome.tabs.executeScript(null, { code: 'console.log("SendContent.js");' + 'chrome.extension.sendRequest({' + ' action: "' + actionKey + '",' + ' host: document.location.hostname,' + ' content: document.getElementsByTagName("html")[0].outerHTML' + '}, function(response){});' }); }, _processListener: function(request, sender, sendResponse){ /*25.*/console.log(this.listeners); // `this.listeners` is 'undefined' ??? if (this.listeners['requestHtml'][request.action]) { this.listeners['requestHtml'][request.action](request.content); delete this.listeners['requestHtml'][request.action]; } } }; </code></pre> <p>The problem is at line 25 of this class. Though the <code>_processListener</code> method is part of <code>CurrentTab</code> class, variable <code>this.listeners</code> is undefined here, when this method is called via callback. </p> <p>Please, how can I fix this and why it is happening? Thanks. </p>
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    1. COI figure out, that this is proplem of pure javascript. This 10-line code example also not working as I expected: http://jsfiddle.net/NmLxm/1/. But if I call manually `bf.processListener()`, it works fine. :-(
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      1. POJava-script, Google chrome extension: Undefined class variable, in method referenced by callback
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