jQuery - how to submit a `post` `multipart/form-data` from a form and get your function called?

Question

So currently I have a form like this:

Answer 1

Maybe you can use the jQuery Form Plugin. The code will be something like it:

<script type="text/javascript"> 
    $(document).ready(function() { 
        $('#form_upload').ajaxForm(function() { 
            alert("Thank you for your upload!"); 
        }); 
    }); 
</script>