vb.org Archive - 'ID already defined' Problems

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- - 'ID already defined' Problems (https://vborg.vbsupport.ru/showthread.php?t=61556)

assassingod

02-14-2004 07:29 PM

'ID already defined' Problems

Does anyone know why I cant use something like:

Code:

<div id="headerfont">Hello blah</div>

Here is some filler text

<div id="headerfont">hello again!</div>

moore

In XHTML? I get this error when validating:

Quote:

ID "headerfont" already defined

This is very annoying because I need to use that id twice (and more times)

Anyway round it?

Dean C

02-14-2004 08:17 PM

Have you checked in your CSS file that it hasn't been defined twice?

assassingod

02-14-2004 08:28 PM

Yes. My CSS is completely valid.

Andreas

02-14-2004 08:41 PM

IDs must be uniqe ... see W3C XHTML Documentation

Quote:

The values of these attributes must be unique within the document,

If you use one ID more then once within a document you will run into problems when using JavaScript/DOM.

assassingod

02-14-2004 08:48 PM

So what's a way round it? I need to use the ID twice.

Andreas

02-14-2004 08:56 PM

You can't ;)

Why do you need this ID twice? For CSS?

assassingod

02-14-2004 08:59 PM

Well I want to use the ID which is used by CSS for font title - and since there are many of them I want to use it more than once (unless im missing something?)

Andreas

02-14-2004 09:23 PM

Quote:

Originally Posted by assassingod

Well I want to use the ID which is used by CSS for font title

I don't understand that ...
Can you post an example of the CSS you want to apply/use?

Chroder

02-14-2004 09:26 PM

Quote:

Originally Posted by KirbyDE

I don't understand that ...
Can you post an example of the CSS you want to apply/use?

When you define CSS with a "#", you use it on an HTML tag with the ID attribute

Code:

#headerfont { color: red; }



<span id="headerfont">esfdsfds</span>

Andreas

02-14-2004 09:31 PM

@Chroder
I do know how to apply CSS to IDs - thanks ;)
But I don't know what assassingod want's to achieve ...

#id CSS is for central formatting a single element (you could also just do that using style="..").

If he want's CSS for many element's he would use a class.
So I don't get why he needs multiple elements with the same ID, as this doesn't make sense to me?

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