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Unified Diff: chrome/common/extensions/docs/examples/extensions/news/feed.html

Issue 3681008: Improvements to the Google News extension (Closed) Base URL: http://src.chromium.org/svn/trunk/src/
Patch Set: '' Created 10 years, 2 months ago
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Index: chrome/common/extensions/docs/examples/extensions/news/feed.html
===================================================================
--- chrome/common/extensions/docs/examples/extensions/news/feed.html (revision 62273)
+++ chrome/common/extensions/docs/examples/extensions/news/feed.html (working copy)
@@ -1,310 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<style>
-body {
- font-family: helvetica, arial, sans-serif;
- font-size: 12px;
- overflow: hidden;
-}
-
-a {
- color:#0000CC;
- text-decoration: underline;
- cursor: pointer;
-}
-
-.open_box {
- display: block;
- overflow: hidden;
- margin-right: 4px;
- margin-top: 2px;
- height: 12px;
- width: 12px;
- float: left;
- clear: left;
- background-image: url(sprite_arrows.gif);
- background-position: 0px -24px;
- cursor: pointer;
-}
-
-.opened .open_box {
- background-position:-12px -24px;
-}
-
-.item {
- padding: 2px 0px;
-}
-
-.item_title {
- display: block;
- min-width: 300px;
- padding-left: 15px;
- cursor: pointer;
-}
-
-.item_desc {
- min-width: 500px;
- height: 0px;
- display: block;
- border: none;
- padding: 0px;
- margin: 0px;
- -webkit-transition: height 0.2s ease-out;
-}
-
-#title {
- display: block;
- margin-left: auto;
-}
-
-.error {
- white-space: nowrap;
- color: red;
-}
-
-.more {
- display: block;
- text-align: right;
- padding-top: 20px;
- padding-right: 10px;
- color: #88C;
-}
-
-</style>
-<script id="iframe_script">
-function reportHeight() {
- var msg = JSON.stringify({type:"size", size:document.body.offsetHeight});
- parent.postMessage(msg, "*");
-}
-
-function frameLoaded() {
- var links = document.getElementsByTagName("A");
- for (i = 0; i < links.length; i++) {
- var class = links[i].className;
- if (class != "item_title" && class != "open_box") {
- links[i].addEventListener("click", showStory);
- }
- }
- window.addEventListener("message", messageHandler);
-}
-
-function showStory(event) {
- var href = event.currentTarget.href;
- parent.postMessage(JSON.stringify({type:"show", url:href}), "*");
- event.preventDefault();
-}
-
-function messageHandler(event) {
- reportHeight();
-}
-
-</script>
-<script>
-// Feed URL.
-var feedUrl = 'http://news.google.com/?output=rss';
-
-// The XMLHttpRequest object that tries to load and parse the feed.
-var req;
-
-function main() {
- req = new XMLHttpRequest();
- req.onload = handleResponse;
- req.onerror = handleError;
- req.open("GET", feedUrl, true);
- req.send(null);
-}
-
-// Handles feed parsing errors.
-function handleFeedParsingFailed(error) {
- var feed = document.getElementById("feed");
- feed.className = "error";
- feed.innerText = "Error: " + error;
-}
-
-// Handles errors during the XMLHttpRequest.
-function handleError() {
- handleFeedParsingFailed('Failed to fetch RSS feed.');
-}
-
-// Handles parsing the feed data we got back from XMLHttpRequest.
-function handleResponse() {
- var doc = req.responseXML;
- if (!doc) {
- handleFeedParsingFailed("Not a valid feed.");
- return;
- }
- buildPreview(doc);
-}
-
-// The maximum number of feed items to show in the preview.
-var maxFeedItems = 5;
-
-// Where the more stories link should navigate to.
-var moreStoriesUrl;
-
-function buildPreview(doc) {
- // Get the link to the feed source.
- var link = doc.getElementsByTagName("link");
- var parentTag = link[0].parentNode.tagName;
- if (parentTag != "item" && parentTag != "entry") {
- moreStoriesUrl = link[0].textContent;
- }
-
- // Setup the title image.
- var images = doc.getElementsByTagName("image");
- var titleImg;
- if (images.length != 0) {
- var urls = images[0].getElementsByTagName("url");
- if (urls.length != 0) {
- titleImg = urls[0].textContent;
- }
- }
- var img = document.getElementById("title");
- if (titleImg) {
- img.src = titleImg;
- if (moreStoriesUrl) {
- document.getElementById("title_a").addEventListener("click", moreStories);
- }
- } else {
- img.style.display = "none";
- }
-
- // Construct the iframe's HTML.
- var iframe_src = "<!doctype html><html><head><script>" +
- document.getElementById("iframe_script").textContent + "<" +
- "/script></head><body onload='frameLoaded();' " +
- "style='padding:0px;margin:0px;'>";
-
- var feed = document.getElementById("feed");
- var entries = doc.getElementsByTagName('entry');
- if (entries.length == 0) {
- entries = doc.getElementsByTagName('item');
- }
- var count = Math.min(entries.length, maxFeedItems);
- for (var i = 0; i < count; i++) {
- item = entries.item(i);
-
- // Grab the title for the feed item.
- var itemTitle = item.getElementsByTagName('title')[0];
- if (itemTitle) {
- itemTitle = itemTitle.textContent;
- } else {
- itemTitle = "Unknown title";
- }
-
- // Grab the description.
- var itemDesc = item.getElementsByTagName('description')[0];
- if (!itemDesc) {
- itemDesc = item.getElementsByTagName('summary')[0];
- if (!itemDesc) {
- itemDesc = item.getElementsByTagName('content')[0];
- }
- }
- if (itemDesc) {
- itemDesc = itemDesc.childNodes[0].nodeValue;
- } else {
- itemDesc = '';
- }
-
- var item = document.createElement("div");
- item.className = "item";
- var box = document.createElement("div");
- box.className = "open_box";
- box.addEventListener("click", showDesc);
- item.appendChild(box);
-
- var title = document.createElement("a");
- title.className = "item_title";
- title.innerText = itemTitle;
- title.addEventListener("click", showDesc);
- item.appendChild(title);
-
- var desc = document.createElement("iframe");
- desc.scrolling = "no";
- desc.className = "item_desc";
- item.appendChild(desc);
- feed.appendChild(item);
-
- // The story body is created as an iframe with a data: URL in order to
- // isolate it from this page and protect against XSS. As a data URL, it
- // has limited privileges and must communicate back using postMessage().
- desc.src="data:text/html," + iframe_src + itemDesc + "</body></html>";
- }
-
- if (moreStoriesUrl) {
- var more = document.createElement("a");
- more.className = "more";
- more.innerText = "More stories \u00BB";
- more.addEventListener("click", moreStories);
- feed.appendChild(more);
- }
-}
-
-// Show |url| in a new tab.
-function showUrl(url) {
- // Only allow http and https URLs.
- if (url.indexOf("http:") != 0 && url.indexOf("https:") != 0) {
- return;
- }
- chrome.tabs.create({url: url});
-}
-
-function moreStories(event) {
- showUrl(moreStoriesUrl);
-}
-
-function showDesc(event) {
- var item = event.currentTarget.parentNode;
- var items = document.getElementsByClassName("item");
- for (var i = 0; i < items.length; i++) {
- var iframe = items[i].getElementsByClassName("item_desc")[0];
- if (items[i] == item && items[i].className == "item") {
- items[i].className = "item opened";
- iframe.contentWindow.postMessage("reportHeight", "*");
- } else {
- items[i].className = "item";
- iframe.style.height = "0px";
- }
- }
-}
-
-function iframeMessageHandler(e) {
- // Only listen to messages from one of our own iframes.
- var iframes = document.getElementsByTagName("IFRAME");
- for (var i = 0; i < iframes.length; i++) {
- if (iframes[i].contentWindow == e.source) {
- var msg = JSON.parse(e.data);
- if (msg) {
- if (msg.type == "size") {
- iframes[i].style.height = msg.size + "px";
- } else if (msg.type == "show") {
- var url = msg.url;
- if (url.indexOf("http://news.google.com") == 0) {
- // If the URL is a redirect URL, strip of the destination and go to
- // that directly. This is necessary because the Google news
- // redirector blocks use of the redirects in this case.
- var index = url.indexOf("&url=");
- if (index >= 0) {
- url = url.substring(index + 5);
- index = url.indexOf("&");
- if (index >= 0)
- url = url.substring(0, index);
- }
- }
- showUrl(url);
- }
- }
- return;
- }
- }
-}
-
-window.addEventListener("message", iframeMessageHandler);
-</script>
-</head>
-<body onload="main();">
-<a id="title_a"><img id='title'></a>
-<div id="feed"></div>
-</body>
-</html>
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