I have a php function string_creator($length) to create a random string. When I want to autofill a form field with that php function via a link, I was using sajax script. It was something like:

1. <?php
   sajax_init();
   sajax_export("string_creator");
   sajax_handle_client_request();
   ?>
   <script type="text/javascript">
   function string_creator_complete(key) {
            if (key == "") {
                alert("error");
            } else {
               document.forms.formName.fieldName.value = key;
            }
   }
   </script>
2. 
   <input type="text" name="fieldName" value="" />
   <a href="javascript:x_string_creator(8, string_creator_complete);">Create a string</a>

When I click "Create a string" link, the "fieldName" field was autofill with the value returned from that php function.

Now I want to move to jQuery from sajax. Is it possible? How?