javascript getElementsByTagName排除某些标签

Question

In my project I'm trying to parse rss & atom feeds. I target each feed's link with this:

var feedLink = source.getElementsByTagName('link')[0];

Some feeds start directly with

<link>http://www.url.com</link>

but some start like this:

<atom:link href="http://www.url.com/feed/" rel="self" type="application/rss+xml" />
<link>http://www.url.com</link>

and the selector I'm using targets also the link tags that starts with atom: Is there a way to avoid them ?

Thanks

Answer 1

Try poping out the link from the end of NodeList , in this case, it will work for both cases.

var x = source.getElementsByTagName('link');
var feedLink = x[(x.length - 1)]

Isn't the best solution, but is the more fastly in this scenario.

Answer 2

You can try using getElementsByTagNameNS instead, but i'm not sure how well it is supported across browsers. Works in latest Chrome.

 var xmlString = [ '<?xml version="1.0" encoding="utf-8"?>', '<feed xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/">', '<atom:link href="http://www.example.com/feed/" rel="self" type="application/rss+xml" />', '<link>http://www.example.com</link>', '</feed>' ].join('\\n'); var xml = (new DOMParser()).parseFromString(xmlString, "text/xml"); // Try regular search var found = xml.getElementsByTagName('link'); for (var i = 0; i < found.length; i++) { console.log('regular', i, found[i].nodeName); } // Try namespaced search var foundNS = xml.getElementsByTagNameNS('http://www.w3.org/2005/Atom', 'link'); for (var i = 0; i < foundNS.length; i++) { console.log('namespaced', i, foundNS[i].nodeName); }