[jQuery] ajaxForm and submit on change of a field

[jQuery] ajaxForm and submit on change of a field

<div id="mb_0">Hello all,
I want to submit the form on change of a dropdown selection rather than clicking the submit button.
I am using the forms plugin and have bound the form to ajaxForm
    $('#paramForm').ajaxForm(paramOptions);
That works fine, but how to do an ajax submit on change of a dropdown field value ?
I have tried things like the code below, but am missing something.  Any help much appreciated.
$(function(){
          $("select#itemsList").change(function(){
            $.paramForm.submit()
          })
})
</div>
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