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Message-ID: <2146299.mvXUDI8C0e@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
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Date: Mon, 09 Jul 2012 22:09:40 +0200
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Subject: Re: Built-in string functions clobber strings in array?
Newsgroups: comp.lang.javascript
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Xref: csiph.com comp.lang.javascript:14978

Gregor Kofler wrote:

> Am 2012-07-09 05:01, terphenyl meinte:
>> var allLinks = content.document.getElementsByTagName("a");
>> […]
>>
>> I thought the elements of allLinks were strings
> 
> allLLinks is a collection of DOM elements.

It refers to a NodeList of references to DOM element objects, which in the 
Gecko DOM also implements the HTMLCollection interface (for reasons I do not 
understand).

> , and, to be conservative
>> copied the strings to a different variable (txt) and then tried a string
>> operation (or two) on that variable.
> 
> An internal toString() method is invoked (which - here in FF - gives you
> the href attribute value of the anchor). However, they are not strings
> and don't provide string methods. Try something like allLinks[jj].href
> which holds a string.

Caveat: The value of the `href' property, and the return value of the 
toString() method, might not reflect the value of the `href' attribute; in 
fact, it may represent the (absolute) URI for a given (relative) URI-
reference (see RFC 3986).  In order to be sure about the value, you would 
need to use getAttribute("href"), but there is IE/MSHTML.

Therefore, ISTM that you need to strip the protocol, host, and path part of 
the current document from the property value before you attempt a match.


PointedEars
-- 
Anyone who slaps a 'this page is best viewed with Browser X' label on
a Web page appears to be yearning for the bad old days, before the Web,
when you had very little chance of reading a document written on another
computer, another word processor, or another network. -- Tim Berners-Lee