AJAX

Dynamic ID

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Join Date: Nov 2008

Posts: 91

Reputation: brechtjah is an unknown quantity at this point

Solved Threads: 9

brechtjah

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Junior Poster in Training

Dynamic ID

Nov 22nd, 2008

Hi,
I'm creating the layout for a dynamic webshop, all pictures are getting dynamic IDs to have their elements changed. I'm currently having errors with the code below and have no idea why.

the argument id is not null, however
document.getElementById(id) is. I don't understand how that can happen

This is my javascript code

 Help with Code Tags 
 javascript Syntax (Toggle Plain Text) 
                <script type="text/javascript">
			function change_bg(id) {
				if(id != null && document.getElementById(id) != null) {
					document.getElementById(id+'bg').src='product_bg_big.png';
					document.getElementById(id+'fg').src='product_fg_big.png';
					document.getElementById(id).src='product_i_big.png';
				}
				else {
					confirm('');
				}
			}
 
			function change_bg_back(id) {
				if(id != null && document.getElementById(id) != null) {
					document.getElementById(id+'bg').src='product_bg.png';
					document.getElementById(id+'fg').src='product_fg.png';
					document.getElementById(id).src='product_i.png';
				}
				else {
					confirm('');
				}
			}
		</script>
                <script type="text/javascript">
			function change_bg(id) {
				if(id != null && document.getElementById(id) != null) {
					document.getElementById(id+'bg').src='product_bg_big.png';
					document.getElementById(id+'fg').src='product_fg_big.png';
					document.getElementById(id).src='product_i_big.png';
				}
				else {
					confirm('');
				}
			}
			
			function change_bg_back(id) {
				if(id != null && document.getElementById(id) != null) {
					document.getElementById(id+'bg').src='product_bg.png';
					document.getElementById(id+'fg').src='product_fg.png';
					document.getElementById(id).src='product_i.png';
				}
				else {
					confirm('');
				}
			}
		</script>

This is my php code:

 Help with Code Tags 
 php Syntax (Toggle Plain Text) 
echo "<td>
<img id='product".$numProduct."fg' src='product_fg.png' alt='product_fg'  onmouseover=javascript:change_bg('product".$numProduct."') onmouseout=javascript:change_bg_back('product".$numProduct."')>
					</td>";
echo "<td>
<img id='product".$numProduct."fg' src='product_fg.png' alt='product_fg'  onmouseover=javascript<b></b>:change_bg('product".$numProduct."') onmouseout=javascript<b></b>:change_bg_back('product".$numProduct."')>
					</td>";

EDIT: what's even stranger is that it all works, when I leave out the if, I just have a FireFox Addon which showed me those errors.
Any help would be very well appreciated.
Thanks

Last edited by brechtjah; Nov 22nd, 2008 at 5:26 pm. Reason: Forgot text