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avoiding duplicate ids with cloneNode

Posted on 2008-10-07
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Last Modified: 2012-06-27
I like to use cloneNode instead of dynamically building up html via DOM methods. However, grabbing the element via getElementBy Id and then clone it, you have duplicate ids.

I usually use the technique in ex 2, but I was wondering if there is anything wrong with the way in ex 1 where I grab the element by id, remove the id attribute, clone the element, set the id attribute back again

<!--  this div just holds templates for cloning -->
<div id="tpl_holder" style="display:none">
 
   <div "confirm_tpl">
   <-- bunch of html here -->
   </div>
 
</div>
 
// ex 1:
var confirm_tpl = getElementByID("confirm_tpl");
confirm_tpl.removeAtrribute("id");
var confirm = confirm_tpl.cloneNode(true);
confirm_tpl.setAtrribute("id","confirm_tpl");
 
 
// ex 2:
var remove_div = getElementsByClassName("commands",getElementByID("tpl_holder"),"div")[0].cloneNode(true);

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Question by:drew22
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4 Comments
 
LVL 42

Expert Comment

by:David S.
ID: 22668023
Why remove the ID of the element before cloning it? Why not just change the ID of the clone before adding it as a child of an element in the document?
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Author Comment

by:drew22
ID: 22671075
>>Why not just change the ID of the clone before adding it as a child
because before you change the id of the clone you will have 2 elements with the same id and element ids must be unique
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Accepted Solution

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David S. earned 2000 total points
ID: 22671543
Yes, but the problem is only if both elements are part of the document. If only one of them is, then it doesn't matter.
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Author Comment

by:drew22
ID: 22671632
right, the clone isn't yet part of the document. forgot about that
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