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Cloning element

Posted on 2006-04-03
Medium Priority
Last Modified: 2006-11-18
I would like to copy/clone html element to spare some lines of javascript code and probably performance because I will be using this frequently.
I tried with something simple (div), but can't make it work.
My environment:
 - parent document
 - nested iframe document

Parent document contains: <div id='myDiv' style='display:none;'>this is my div</div>
and javascript:
el = iframeDoc.body.appendChild(document.getElementById("myDiv").cloneNode(false));

This line of javascript code is called from iframe and doesn't work. It reports "invalid argument" error.
If I runtime create element (createElement()) and append it to the iframe document body then it works. Where's the catch?

Question by:hpet
  • 2
  • 2

Accepted Solution

smaccari earned 200 total points
ID: 16361332
I don't think you can even append a node in your frame document if you created it with document.createElement() (document being the parent document).
You can if you use frameDoc.createElement and then append it to frameDoc.
In fact, a node belongs to a document object and can not be appended to another document object.

Expert Comment

ID: 16361385
By the way, looks like Firefox enables this kind of operation, tried your simple code and it works.

Author Comment

ID: 16361528
I know, but it doesn't work in IE.
It works without problems if I createElement, setAttribute, and then append. but I have some idea in my head that makes me think that cloning an existing node will be faster and easier if I will use this on frequent basis (cloning vs. always newly create and set everything).

Now that you brought up document objects, it makes sence, and not... if I clone node then specification says it is just a copy of object not belonging anywhere until you append it. It should behave the same way as if I manualy create it.

I think cross document object restrictions shouldn't apply here because I am calling this script from the document object I want to append clone to.

Author Comment

ID: 16362217
I think I have found explanation:

...and here we are... oh, I just love it.

I think I will stick to createElement, appendElement since it appears to be less a trouble (I don't have that many elements to create anyhow. Cloning will be left for better days.

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