validate a ajax dropdown

i am creating a dropdown box using ajax.Now i want to check whether he(user) has selected value from that. i am getting object not found error, since that will be created only at runtime

We can not read minds here. We need to see some code if you really expect us to help you out.

Normally object expected means that you are trying to reference an object that is not on the page. So that means you either are not adding it to the page correctly or referencing it before it is there.

Eric

i am sorry if i am not able to specify clearly

ajax code
----------------------------------- 
out.println("<select name=\"dropdownSuspType\"> ");
if("10102".equals(statusValue))
out.println("<option value =\"Please Select\">Please Select</option>");
out.println("<option value =\"Manual\">Manual</option>");
out.println("<option value =\"Auto\">Auto</option>");
if("10102".equals(statusValue))
{
out.println("<option value =\"Bill not paid\">Bill not paid</option>");
out.println("<option value =\"ChequeBounce\">ChequeBounce</option>");
out.println("<option value =\"Credit limit/credit card problem\">Credit limit/credit card problem</option>");
out.println("<option value =\"Customer requested inactivation\">Customer requested inactivation</option>");
out.println("<option value =\"Suspected Customer misconduct\">Suspected Customer misconduct</option>");
out.println("<option value =\"Voluntary\">Voluntary</option>");
}

out.println("</select>");

main page code
------------------------------
 
if(document.frm.dropdownSuspType[document.frm.dropdownSuspType.selectedIndex].value=='Please Select')
{
alert("Select Status");
return false;
}
 
and 
 
subqry= "[" + document.frm.dropdownSuspType[document.frm.dropdownSuspType.selectedIndex].value + "] ";

since "dropdownSuspType" variable is not in main page, and it comes from ajax. i am getting error

If the use is not selecting status and it's default("Please Select") is selected then i should display alert "Please select status".

You really shouldn't be transferring a complete select element from the server. If you already have that element on the page, and just hidden until needed, simply return the results that should be displayed as options for the select only. Populate the select with the options returned from the server.

And when I say options I don't mean return

I mean, return the value/label pairs from the server. There are examples all over the web on how to do this.

thanks Gregg,
Is it possible to hide a dropdown box i.e, <select></select>

Till now i know only "<input type=hidden/>"

My requirement now is, the dropdown should be visable to user only when he click one option button

You can use either the CSS display or visible properties to hide/unhide an element.