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<!DOCTYPE html>
* Copyright (c) 2010 The Chromium Authors. All rights reserved. Use of this
* source code is governed by a BSD-style license that can be found in the
* LICENSE file.
* Performs an XMLHttpRequest to Twitter's API to get trending topics.
* @param callback Function If the response from fetching url has a
* HTTP status of 200, this function is called with a JSON decoded
* response. Otherwise, this function is called with null.
function getHNComments(URL, callback) {
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function(data) {
if (xhr.readyState == 4) {
if (xhr.status == 200) {
var data = JSON.parse(xhr.responseText);
} else {
// Note that any URL fetched here must be matched by a permission in
// the manifest.json file!
var url = ""+ escape(URL) +"&format=json";'GET', url, true);
* Handles data sent via chrome.extension.sendRequest().
* @param request Object Data sent in the request.
* @param sender Object Origin of the request.
* @param callback Function The method to call when the request completes.
function onRequest(request, sender, callback) {
// Only supports the 'fetchTwitterFeed' method, although this could be
// generalized into a more robust RPC system.
getHNComments(request.URL, callback);
// Wire up the listener.
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