CascadingDropDown Error - 'options' is null or not an object

Question

I have five DropDownLists linked together with the CascadingDropDown AJAX control. When it's running locally, they work fine. However when running on the production server over the internet, I get this error every time I select a new item:

'options' is null or not an object

Debugging this shows the function that's causing it (it's JS from the CascadingDropDown control):

_clearItems : function() {
    /// <summary>
    /// Clear the items from the drop down
    /// </summary>
    /// <returns />

    var e = this.get_element();
    while (0 < e.options.length) {
        e.remove(0);
    }
},

Does anyone have any ideas as to why it's doing this? I suspect it's because it takes longer to load the items over the internet and somehow this is affect the control?

I'm running .NET 3.5.

Thanks in advance.

Answer 1

Make sure drop down list has autopostback = "false".autopostback = "true" was causing the problem for me. - Fahad