Ajax Toolkit CascadingDropDown onload event?

Question

I would like to know if this is possible to create an JavaScript/jQuery event on Ajax Toolkit CascadingDropDon load.

Scenario:

I am selecting item on first dropdown -> second dropdown is loaded with Ajax Toolkit cascading dropdown feature -> as a reaction for this my JavaScript function fires.

Answer 1

Did it!

Here's a method:

In CascadinDropDown declaration I have added BehaviourID:

<cc1:CascadingDropDown 
ID="CascadingDDL" 
TargetControlID="childDDL" 
ParentControlID="parentDDL"
Category="ddl"
PromptText="Select"
ServicePath="~/webmethods.asmx"  
runat="server" **BehaviorID="cddBehaviourID"**
ServiceMethod="GetValuesForDDL" Enabled="True">
</cc1:CascadingDropDown>

In script:

function pageLoad(sender, args) {    //For Ajax toolkit to fire on 'window.onload'

      var behavior = $find('<%=CascadingDDL.BehaviurID %>');

      if (behavior != null) {

            behavior.add_populated(function() { *what you want to execute* });

      }
}