英文:A链接标记ie下会自动补全href
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英文:A链接标记ie下会自动补全href.
Whilst working on the Ajax Link Tracker and MapSurface I have come across an inconsistency in how the href attribute is retrieved using DOM Scripting.
The href attribute is different to other element attributes in that the value set can be relative to the context of the page URL. If you set a link with a relative href attribute
<a href="../development/test1.html">test page</a>
The browser will look at the pages current URL and derive an absolute URL for the link.
http://www.glenn.jones.net/development/test1.html
This is the root of the problem, some browsers return the text of the attribute and others return the derived absolute URL. The results also differ by the method you use to retrieve the href attribute. There are three common ways to access an attribute:
linkobj.href; linkobj[‘href’]; linkobj.getAttribute(‘href’);
The
linkobj.href
and linkobj[‘href’];
methods of accessing the attribute consistently return the derived absolute URL.
Microsoft has tried to address this by
linkobj.getAttribute(‘href’); linkobj.getAttribute(‘href’,2);
Absolute URL
So what should be returned by the getAttribute method?
After a really good exchange with Jim in the comments below, I stand corrected. The specification does say the getAttribute should return the attribute value, not the absolute URL. The Microsoft approach is wrong.
For the time being I am using the old school object property method
linkobj.href
to return derived absolute URLs. It provides the most consistent results across all browsers.
URLs of interestW3C REC DOM Level 2 Core specification for getAttribute
Gecko documentation for getAttribute
Microsoft documentation for getAttribute
As usual just as I was finishing this post I found this bug report on the QuickMode site which discusses the same subject.
getAttribute HREF is always absolute.html
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