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?

assassingod

02-14-2004 10:34 PM

Chroder said it fine, except I want to be able to use

Code:

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

As many times as I want without getting that 'ID already defined' error.

Andreas

02-14-2004 10:47 PM

This is not possible without breaking XHTML 1.0 rules :)

And I still don't understand WHY you need multiple elements with the same ID ...

Code:

<style type="text/css">

.headerfont {

  font-family: Comic Sans MS;

  color:  red;

  font-weight: bold;

}

</style>



[...]



<div class="headerfont">This is one text in bold, red, Comic Sans MS</div>

<div class="headerfont">And another one</div>

<div class="headerfont">A third one</div>

<div class="headerfont">A fourth one ... does this get boring? ;)</div>

assassingod

02-14-2004 10:49 PM

Because i'll be implenting it into a system. So the output of the script will be:

Code:

<div class="whatever">

here is some text blah blach blah

<div>

And that code will be loop'd, so obviously there is going to be more than 1 result, ergo more div tags.

Andreas

02-14-2004 10:53 PM

Well, in the code you just posted you are using class, so where is your ID problem?

Where do you need multiple elements with the same ID, that's what I don't understand?

assassingod

02-14-2004 10:58 PM

Alright, let me try another way:)

Chroder

02-14-2004 11:23 PM

Quote:

Originally Posted by KirbyDE

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

lol Sorry ;) I thought you were confuzzled :nervous:

Quote:

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

I never knew that ;) I think I've been using ID's for multiple items as well.

[high]* Chroder takes a note[/high]

assassingod

02-15-2004 01:39 AM

Ok i've fixed it now - thanks:D

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