[英]How to parse an RSS feed using JavaScript?
我需要解析 RSS 提要(XML 2.0 版)並在 HTML 頁面中顯示解析的詳細信息。
(真的不推薦那個,請參閱其他選項。)
jQuery.getFeed({
url : FEED_URL,
success : function (feed) {
console.log(feed.title);
// do more stuff here
}
});
$.get(FEED_URL, function (data) {
$(data).find("entry").each(function () { // or "item" or whatever suits your feed
var el = $(this);
console.log("------------------------");
console.log("title : " + el.find("title").text());
console.log("author : " + el.find("author").text());
console.log("description: " + el.find("description").text());
});
});
$.ajax({
url : document.location.protocol + '//ajax.googleapis.com/ajax/services/feed/load?v=1.0&num=10&callback=?&q=' + encodeURIComponent(FEED_URL),
dataType : 'json',
success : function (data) {
if (data.responseData.feed && data.responseData.feed.entries) {
$.each(data.responseData.feed.entries, function (i, e) {
console.log("------------------------");
console.log("title : " + e.title);
console.log("author : " + e.author);
console.log("description: " + e.description);
});
}
}
});
但這意味着您依賴於他們在線且可訪問。
一旦您成功地從提要中提取了您需要的信息,您就可以創建DocumentFragment
s(使用document.createDocumentFragment()
包含您想要注入以顯示您的數據的元素(使用document.createElement()
創建document.createElement()
。
在頁面上選擇您想要的容器元素並將您的文檔片段附加到它,然后簡單地使用 innerHTML 完全替換其內容。
就像是:
$('#rss-viewer').append(aDocumentFragmentEntry);
要么:
$('#rss-viewer')[0].innerHTML = aDocumentFragmentOfAllEntries.innerHTML;
使用這個問題的 feed ,在撰寫本文時給出:
<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom" xmlns:creativeCommons="http://backend.userland.com/creativeCommonsRssModule" xmlns:re="http://purl.org/atompub/rank/1.0">
<title type="text">How to parse a RSS feed using javascript? - Stack Overflow</title>
<link rel="self" href="https://stackoverflow.com/feeds/question/10943544" type="application/atom+xml" />
<link rel="hub" href="http://pubsubhubbub.appspot.com/" />
<link rel="alternate" href="https://stackoverflow.com/q/10943544" type="text/html" />
<subtitle>most recent 30 from stackoverflow.com</subtitle>
<updated>2012-06-08T06:36:47Z</updated>
<id>https://stackoverflow.com/feeds/question/10943544</id>
<creativeCommons:license>http://www.creativecommons.org/licenses/by-sa/3.0/rdf</creativeCommons:license>
<entry>
<id>https://stackoverflow.com/q/10943544</id>
<re:rank scheme="http://stackoverflow.com">2</re:rank>
<title type="text">How to parse a RSS feed using javascript?</title>
<category scheme="https://stackoverflow.com/feeds/question/10943544/tags" term="javascript"/><category scheme="https://stackoverflow.com/feeds/question/10943544/tags" term="html5"/><category scheme="https://stackoverflow.com/feeds/question/10943544/tags" term="jquery-mobile"/>
<author>
<name>Thiru</name>
<uri>https://stackoverflow.com/users/1126255</uri>
</author>
<link rel="alternate" href="https://stackoverflow.com/questions/10943544/how-to-parse-a-rss-feed-using-javascript" />
<published>2012-06-08T05:34:16Z</published>
<updated>2012-06-08T06:35:22Z</updated>
<summary type="html">
<p>I need to parse the RSS-Feed(XML version2.0) using XML and I want to display the parsed detail in HTML page, I tried in many ways. But its not working. My system is running under proxy, since I am new to this field, I don't know whether it is possible or not. If any one knows please help me on this. Thanks in advance.</p>
</summary>
</entry>
<entry>
<id>https://stackoverflow.com/questions/10943544/-/10943610#10943610</id>
<re:rank scheme="http://stackoverflow.com">1</re:rank>
<title type="text">Answer by haylem for How to parse a RSS feed using javascript?</title>
<author>
<name>haylem</name>
<uri>https://stackoverflow.com/users/453590</uri>
</author>
<link rel="alternate" href="https://stackoverflow.com/questions/10943544/how-to-parse-a-rss-feed-using-javascript/10943610#10943610" />
<published>2012-06-08T05:43:24Z</published>
<updated>2012-06-08T06:35:22Z</updated>
<summary type="html"><h1>Parsing the Feed</h1>
<h3>With jQuery's jFeed</h3>
<p>Try this, with the <a href="http://plugins.jquery.com/project/jFeed" rel="nofollow">jFeed</a> <a href="http://www.jquery.com/" rel="nofollow">jQuery</a> plug-in</p>
<pre><code>jQuery.getFeed({
url : FEED_URL,
success : function (feed) {
console.log(feed.title);
// do more stuff here
}
});
</code></pre>
<h3>With jQuery's Built-in XML Support</h3>
<pre><code>$.get(FEED_URL, function (data) {
$(data).find("entry").each(function () { // or "item" or whatever suits your feed
var el = $(this);
console.log("------------------------");
console.log("title : " + el.find("title").text());
console.log("author : " + el.find("author").text());
console.log("description: " + el.find("description").text());
});
});
</code></pre>
<h3>With jQuery and the Google AJAX APIs</h3>
<p>Otherwise, <a href="https://developers.google.com/feed/" rel="nofollow">Google's AJAX Feed API</a> allows you to get the feed as a JSON object:</p>
<pre><code>$.ajax({
url : document.location.protocol + '//ajax.googleapis.com/ajax/services/feed/load?v=1.0&amp;num=10&amp;callback=?&amp;q=' + encodeURIComponent(FEED_URL),
dataType : 'json',
success : function (data) {
if (data.responseData.feed &amp;&amp; data.responseData.feed.entries) {
$.each(data.responseData.feed.entries, function (i, e) {
console.log("------------------------");
console.log("title : " + e.title);
console.log("author : " + e.author);
console.log("description: " + e.description);
});
}
}
});
</code></pre>
<p>But that means you're relient on them being online and reachable.</p>
<hr>
<h1>Building Content</h1>
<p>Once you've successfully extracted the information you need from the feed, you need to create document fragments containing the elements you'll want to inject to display your data.</p>
<hr>
<h1>Injecting the content</h1>
<p>Select the container element that you want on the page and append your document fragments to it, and simply use innerHTML to replace its content entirely.</p>
</summary>
</entry></feed>
調用:
$.get('https://stackoverflow.com/feeds/question/10943544', function (data) {
$(data).find("entry").each(function () { // or "item" or whatever suits your feed
var el = $(this);
console.log("------------------------");
console.log("title : " + el.find("title").text());
console.log("author : " + el.find("author").text());
console.log("description: " + el.find("description").text());
});
});
打印出來:
------------------------
title : How to parse a RSS feed using javascript?
author :
Thiru
https://stackoverflow.com/users/1126255
description:
------------------------
title : Answer by haylem for How to parse a RSS feed using javascript?
author :
haylem
https://stackoverflow.com/users/453590
description:
調用:
$.ajax({
url : document.location.protocol + '//ajax.googleapis.com/ajax/services/feed/load?v=1.0&num=10&callback=?&q=' + encodeURIComponent('https://stackoverflow.com/feeds/question/10943544'),
dataType : 'json',
success : function (data) {
if (data.responseData.feed && data.responseData.feed.entries) {
$.each(data.responseData.feed.entries, function (i, e) {
console.log("------------------------");
console.log("title : " + e.title);
console.log("author : " + e.author);
console.log("description: " + e.description);
});
}
}
});
打印出來:
------------------------
title : How to parse a RSS feed using javascript?
author : Thiru
description: undefined
------------------------
title : Answer by haylem for How to parse a RSS feed using javascript?
author : haylem
description: undefined
另一個已棄用(感謝@daylight)選項,對我來說最簡單(這是我用於SpokenToday.info 的):
不使用 JQuery 的Google Feed API ,只需 2 個步驟:
導入庫:
<script type="text/javascript" src="https://www.google.com/jsapi"></script> <script type="text/javascript">google.load("feeds", "1");</script>
查找/加載提要( 文檔):
var feed = new google.feeds.Feed('http://www.google.com/trends/hottrends/atom/feed?pn=p1'); feed.load(function (data) { // Parse data depending on the specified response format, default is JSON. console.dir(data); });
要解析數據,請查看 有關響應格式的文檔。
如果您正在為您的 rss 小部件尋找一個簡單且免費的Google Feed API替代方案,那么rss2json.com可能是一個合適的解決方案。
您可以嘗試查看以下api 文檔中的示例代碼是如何工作的:
google.load("feeds", "1"); function initialize() { var feed = new google.feeds.Feed("https://news.ycombinator.com/rss"); feed.load(function(result) { if (!result.error) { var container = document.getElementById("feed"); for (var i = 0; i < result.feed.entries.length; i++) { var entry = result.feed.entries[i]; var div = document.createElement("div"); div.appendChild(document.createTextNode(entry.title)); container.appendChild(div); } } }); } google.setOnLoadCallback(initialize);
<html> <head> <script src="https://rss2json.com/gfapi.js"></script> </head> <body> <p><b>Result from the API:</b></p> <div id="feed"></div> </body> </html>
對於閱讀本文的其他人(從 2019 年開始),不幸的是,大多數 JS RSS 閱讀實現現在都不起作用。 首先,Google API 已關閉,因此這不再是一種選擇,並且由於 CORS 安全策略,您現在通常無法跨域請求 RSS 提要。
使用https://www.raymondcamden.com/2015/12/08/parsing-rss-feeds-in-javascript-options (2015) 上的示例,我得到以下信息:
Access to XMLHttpRequest at 'https://feeds.feedburner.com/raymondcamdensblog?format=xml' from origin 'MYSITE' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
這是正確的,是最終網站的安全預防措施,但現在確實意味着上述答案不太可能奏效。
我的解決方法可能是通過 PHP 解析 RSS 提要並允許 javascript 訪問我的 PHP,而不是嘗試訪問最終目的地提要本身。
如果你想使用一個普通的 javascript API, https://github.com/hongkiat/js-rss-reader/有一個很好的例子
https://www.hongkiat.com/blog/rss-reader-in-javascript/的完整說明
它使用fetch
方法作為異步獲取資源的全局方法。 下面是一段代碼:
fetch(websiteUrl).then((res) => {
res.text().then((htmlTxt) => {
var domParser = new DOMParser()
let doc = domParser.parseFromString(htmlTxt, 'text/html')
var feedUrl = doc.querySelector('link[type="application/rss+xml"]').href
})
}).catch(() => console.error('Error in fetching the website'))
許多誤導性的文章和答案讓我非常惱火,以至於我編寫了自己的 RSS 閱讀器: https : //gouessej.wordpress.com/2020/06/28/comment-creer-un-lecteur-rss-en-javascript-how- to-create-a-rss-reader-in-javascript/
您可以使用 AJAX 請求來獲取 RSS 文件,但當且僅當您使用 CORS 代理時它才會工作。 我將嘗試編寫自己的 CORS 代理,為您提供更強大的解決方案。 同時,它工作正常,我將它部署在我的 Debian Linux 下的服務器上。
我的解決方案不使用 JQuery,我只使用沒有第三方庫的純 Javascript 標准 API,它甚至可以與 Microsoft Internet Explorer 11 一起使用。
您可以使用jquery-rss或Vanilla RSS ,它們帶有漂亮的模板並且非常易於使用:
// Example for jquery.rss
$("#your-div").rss("https://stackoverflow.com/feeds/question/10943544", {
limit: 3,
layoutTemplate: '<ul class="inline">{entries}</ul>',
entryTemplate: '<li><a href="{url}">[{author}@{date}] {title}</a><br/>{shortBodyPlain}</li>'
})
// Example for Vanilla RSS
const RSS = require('vanilla-rss');
const rss = new RSS(
document.querySelector("#your-div"),
"https://stackoverflow.com/feeds/question/10943544",
{
// options go here
}
);
rss.render().then(() => {
console.log('Everything is loaded and rendered');
});
有關工作示例,請參閱http://jsfiddle.net/sdepold/ozq2dn9e/1/ 。
現在試圖找到一個好的解決方案,我偶然發現了FeedEk jQuery RSS/ATOM Feed 插件,它在通過 jQuery Feed API解析和顯示 RSS 和 Atom 提要方面做得很好。 對於基本的基於 XML 的 RSS 提要,我發現它的工作原理非常棒,不需要服務器端腳本或其他 CORS 解決方法,它甚至可以在本地運行。
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