Object getElementsByTagName IE7 Bug

最新推荐文章于 2019-07-25 17:08:55 发布

FuDesign2008

最新推荐文章于 2019-07-25 17:08:55 发布

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本文介绍了一个有趣的IE7浏览器Bug，当通过JavaScript访问<object>元素的.all或getElementsByTagName("*")属性时，返回的节点集总是空的。文中提供了一个简单的HTML示例及解决此问题的一种方法。

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转载自： http://ejohn.org/blog/object-getelementsbytagname-ie7-bug/

So here's a fun bug to keep you entertained this weekend. Personally, this is the first purely-JavaScript bug that I've seen in IE7 (More due to the lack of anything changing than the quality of the code.)

Summary:
When accessing the .all or .getElementsByTagName("*") properties on the DOM representation of an <object> element, the resulting NodeSet will always be empty.

Proof of Concept:
HTML:

JavaScript:

var obj = document. getElementsByTagName ( "object" ) [ 0 ];
// => <object/>
obj. all
// => []
obj. getElementsByTagName ( "*" )
// => []
obj. getElementsByTagName ( "param" )
// => [ <param/>, <param/>, <param/> ]
obj. firstChild
// => <param/>

Andrea has done some fantastic work in tracking this bug down and providing a fix for it.

So far, my quick-and-dirty kludge is just to replace "*" with "param" and hope that the user is actually using an object to hold params, and not some other crazy combination.

Which reminds me - has anyone ever seen an example of an <object> element containing non-param elements on a real, live, web page - somewhere in the wild? The HTML spec says that the <object> element can contain any HTML, but that sounds a little bit too crazy for my tastes.