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undefined child element

 

undefined child element
rackham

30 Jun, 2009 - 01:15 AM
Post #1

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Joined: 30 Jun, 2009
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Hello everyone, I have a problem with my javascript, im new to it so please bear with me.

I have a function which looks like

CODE

function mainLeftElements(){
    var containerDiv = document.getElementById('mainLeft');
    var elems = containerDiv.childNodes;
    alert(elems.length);
}


which for a div declared like so

CODE

<div id = 'mainLeft'></div>


alerts me it has a length of 1, trying to work out what the element is (thinking it might be a blank text element or something, maybe the id attribute also??) by using

CODE

elems[0].tagName


and

CODE

elems[0].id


i get confused as they both return 'undefined', so what is it?

Thanks for any help you can offer me,

Rackham

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SoLi

RE: Undefined Child Element

30 Jun, 2009 - 03:20 AM
Post #2

andydust.com
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Joined: 27 Jan, 2002
Posts: 1,428



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For me your code alerts a length of 0. Are you sure the code you have posted on this thread is exactly the same as in your original source?

Indeed had you had a space character (or even line breaks) inside your div, the length would correctly be 1, as a child TEXT_NODE would exist.

Furthermore TEXT_NODE's (not being Element nodes) correctly do not have an ID or tagName attribute set, which is why those would return undefined.

If you are sure there are no text characters inside your div, please post which browser you are using to test this script.

Thanks.

This post has been edited by SoLi: 30 Jun, 2009 - 03:23 AM
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SoLi

RE: Undefined Child Element

30 Jun, 2009 - 03:26 AM
Post #3

andydust.com
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Here you can see a list of methods supported by text nodes (there is only one):

http://www.w3.org/TR/REC-DOM-Level-1/level...l#ID-1312295772

compared with element nodes:

http://www.w3.org/TR/REC-DOM-Level-1/level...ml#ID-745549614
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