autocomplete.js

$(function () {
    var ele_id = 'appResource';
    var auto_complete = $( '#' + ele_id);
    var auto_complete_hidden = $('<input id="' + ele_id + '_auto_complete_hidden' + '" type="hidden"/>');
                                   
    auto_complete_hidden.insertAfter(auto_complete);            

	auto_complete.autocomplete({
		source: app_resource_url,
		minLength: 1,
		select: function( event, ui ) {
                    auto_complete_hidden.val(ui.item.id);
		},
        change: function(){
            auto_complete_hidden.val("");
        }
	});

    var extensions = {
            showId : function(){
                alert("id");
            }
    };

    $.extend($.fn.autocomplete, extensions);

    auto_complete.autocomplete.showId();
});