[jQuery] Autocomplete - trouble with getJSON callback function not executing?

[jQuery] Autocomplete - trouble with getJSON callback function not executing?


Hi, I'm a jquery newbie, and I'm having trouble making the autocomplete
plugin working with cross-domain calls. The alert in my callback function
is never executed. Can't figure out why!
Here's the plugin I'm using:
http://plugins.jquery.com/project/jq-autocomplete
Here's the simple JSON data returned from external server
http://include.classistatic.com/include/c3js/classifieds/rel1/auto/a/p3.js:
{"kjq":["apple1","apple2","apple3","apple4","apple5","apple6","apple2"]}
//Let me know if this is invalid JSON
I've modified this line to include a JSONP callback parameter
"jsoncallback=?":
$.getJSON(ajax, "val=" + input.val() + "&jsoncallback=?", function
(json) { alert("Hello");});
What am I doing wrong?
Any help would be appreciated!
Here's my complete code:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
    <!-- Start of HtmlPageHtmlHead -->
    <head>
        
    </head>
<body >    
<table border="0" cellpadding="0" cellspacing="0" valign="top" width="100%">
<tr>
    <td nowrap="true" width="60%">
            <input type="text" name="Keyword" value="" class="keyword">
    </td>
</tr>
</table>
            <script
src="http://include.classistatic.com/include/c3js/classifieds/rel1/jquery-1.2.6.js"></script>
            <script>
            //This part is from jquery.ui.autocomplete.ext.js
            (function($) {
                $.ui = $.ui || {};
                $.ui.autocomplete = $.ui.autocomplete || {};
                $.ui.autocomplete.ext = $.ui.autocomplete.ext || {};
                
                $.ui.autocomplete.ext.ajax = function(opt) {
                    var ajax = opt.ajax;
                    return { getList: function(input) {
                        $.getJSON(ajax, "val=" + input.val() + "&jsoncallback=?",
function(json) { alert("Hello");});
                    } };
                };
                
                $.ui.autocomplete.ext.templateText = function(opt) {
                    var template = $.makeTemplate(opt.templateText, "<%", "%>");
                    return { template: function(obj) { return template(obj); } };
                };
                
            })(jQuery);
            </script>
            <script type="text/javascript"
src="http://include.classistatic.com/include/c3js/classifieds/rel1/jquery.ui.autocomplete.js"></script>
            <script type="text/javascript"
src="http://include.classistatic.com/include/c3js/classifieds/rel1/jquery.dimensions.js"></script>
            <script>
$(document).ready(function(){
    
$("input.keyword").autocomplete({ajax:"http://include.classistatic.com/include/c3js/classifieds/rel1/auto/a/p3.js"});
        //$("input.keyword").autocomplete({ajax:"p.js"});
});
</script>    
    </body>
</html>
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