Trigger the change event of a textbox in jQuery

Question

I have an asp:TextBox with asp:RegularExpressionValidator to validate if it's a number. Obviously an onchange event will be attached to this textbox while rendering. Also I add a change event at $(document).ready to make some calculation when the value is changed.

<asp:TextBox id="myText" runat="server" />
<asp:regularexpressionvalidator id="myRev" ControlToValidate="myText" runat="server">*</asp:regularexpressionvalidator>

$(document).ready(function(){
    $('[id$=myText]').bind('change',function(){
           //do something
    }).change();      //force the change event at the very beginning
});

My function will be executed later than the .net generated js because of the register time. But the .net js throws an error. I traced in the js:

   function ValidatorOnChange(event) {
       ...
   }

and found that all of event.fromElement,event.toElement,event.srcElement are null which causes the exception. Did I do something wrong? Any solutions? Thanks.

EDIT

It's proved to be a MS bug, working fine in .NET 4.

Answer 1

Pack your calculations in a function and call it on ready event instead of triggering a change:

$(document).ready(function(){
    $('[id$=myText]').bind('change',function(){
           doCalc(); // or doCalc(this) or whatever you need
    });
    doCalc();
});

Answer 2

Including Pointy's point (I crack myself up) about ID, you can re-write it like this:

$(function(){
  $('#<%=myText.ClientID%>').change(function() {
    //stuff
  }).triggerHandler('change');
});

Without seeing exactly how your other event is attached, .triggerHandler() would be my best suggestion, as the event doesn't bubble up for capture by the .Net handler.