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Message-ID: <4798181.JASjUMmgV0@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Tue, 27 Nov 2012 17:49:53 +0100
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Subject: Re: baffled trying to call style.display value
Newsgroups: comp.lang.javascript
References: <8b828e29-6604-45c7-9166-f17e5b39724d@googlegroups.com> <ahk8a9FhjhjU1@mid.uni-berlin.de>
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Jake Jarvis wrote:

> Am 27.11.2012 17:08, schrieb JeffG:
>> I am creating a table of contents with nested UL lists. Many of the LI
>> tags contain A tags and the UL of a lower-level list. The A tags call a
>> function meant to show toggle display of the lower level lists. The link
>> passes the "this" keyword to the function, which gets the parent node and
>> then finds the sibling UL. For some reason, the function is unable to
>> return the style.display value that was set by the CSS file (Loaded
>> before the javascript). So the first time I run the function by clicking
>> the link, my "if" test always goes to the else statement. What am I doing
>> wrong? Here is the function: function TocOpenClose(Anc) { var parenLI;
>> var NextUL; parenLI = Anc.parentNode; NextUL =
>> parenLI.getElementsByTagName("ul")[0];
>>
>> if (NextUL.style.display=="none")
>> {
>> NextUL.style.display = "block";
>> }
>> else
>> {
>> NextUL.style.display = "none";
>> }
>> }
>>
> 
> The problem is the style property _only_ reflects inline style
> information (<ul style="...">).
> 
> One approach could be to use special class names for the elements, you
> can check for existence and add/remove them relatively easily.

In this case it is better to not hide elements by default, to hide them with 
client-side scripting when the document has been loaded, and to assign "" 
instead of "block".  The Web site should work without sufficient client-side 
script support as well.  It is prudent to wrap the list into a user-defined 
widget object that eases modification of the list as an outline.
 

PointedEars
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