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From: Jake Jarvis <pig_in_shoes@yahoo.com>
Newsgroups: comp.lang.javascript
Subject: Re: baffled trying to call style.display value
Date: Tue, 27 Nov 2012 17:33:13 +0100
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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.

-- 
Jake Jarvis