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#631 ✓invalid

Core 1.2.1, getChildren() throws error with IE6/7

Reported by fcartegnie | March 31st, 2009 @ 04:19 AM | in 2.0 (closed)

I'm unable to use getChildren() with IE6/7. works with any other browser. Error thrown is "this object has no such property or method". (translation)

My code looks like that: foo(a) { a.getChildren(); } foo

Works if I lookup the id instead of having the element passed to the function: If I try something like $('foo').getChildren() there's no error.

Comments and changes to this ticket

  • Daniele C.

    Daniele C. March 31st, 2009 @ 12:03 PM

    • Tag changed from 1.2.1, explorer, getchilrent, ie to 1.2.1, explorer, getchildren, ie

    Sorry, but I really was not able to reproduce the error. I've tried to do somethig like this:


    function printElems(a){
    But it works with no problem in both IE6 and IE7.
    Are you doing something different?
  • fcartegnie

    fcartegnie March 31st, 2009 @ 01:31 PM

    Yes, differently. You're accessing the element through $() while I'm getting directly its reference from an event or script call.

    foo(root) { root.getChildren(); }
    <a onClick=\"foo(this);\">foo</a>

    I now switched back to something like

     for(var i=0; i<(root.childNodes.length); i++)

    and it works this way :/

  • fcartegnie

    fcartegnie March 31st, 2009 @ 02:14 PM

    • Assigned user set to “Aaron Newton”

    Okay, figured out the reasons:

    The script result generated a page like this:

    <form name="formroot">......</form>
    <a onClick=\"foo(document.formroot);\">foo</a>

    It was accessing the element by name, the old way. In that case, - root.childNodes (works everywhere) - root.getChildren() (works only outside Trident browsers)

    Now, I also identified another problem with 'by name access' and explorer:

    <img onclick="foo2(this);">
    function foo2(me)
    var root = me.getParent();
    var br = document.createElement("br");
    br.inject(root, 'bottom');

    Fails on inject. Same kind of error.

    I guess mootools with IE doesn't add the required methods: - accessed elements - elements created with document.createElement()

    Fixed the page code by accessing by id with $() and (new Element()).inject()

  • fcartegnie

    fcartegnie March 31st, 2009 @ 02:15 PM

    • Assigned user cleared.
  • Tom Occhino

    Tom Occhino April 2nd, 2009 @ 12:55 PM

    • State changed from “new” to “invalid”

    In order to use mootools methods on elements, the must be extended.

    The reason this works in non-ie browsers is because they support HTMLElement.prototype, and we exploit this fact (of course).

    directly from the docs:

    • In Internet Explorer, the Element is extended the first time $ is called on it, and all the Element Methods become available.
    • Browsers with native HTMLElement support, such as Safari, Firefox, and Opera, apply all the Element Methods to every DOM element automatically.
    • Because MooTools detects if an element needs to be extended or not, this function may be called on the same Element many times with no ill effects.

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