AJAX в Joomla - Модули и плагины

<script type="text/javascript">
	function loadXMLDoc(method, url) {
		if(window.XMLHttpRequest) {
			req = new XMLHttpRequest();
			req.onreadystatechange = processReqChange;
			req.open(method, url, true);
			req.send(null);
		} 
		else if (window.ActiveXObject) {
			req = new ActiveXObject("Microsoft.XMLHTTP");
			if(req) {
				req.onreadystatechange = processReqChange;
				req.open(method, url, true);
				req.send( );
			}
		}
	}
	
	function processReqChange() {
		if(req.readyState == 4) {
			if(req.status == 200) { getCities(req.responseXML.documentElement); } 
			else { alert("There was a problem retrieving the XML data:\n" + req.statusText); }
		}
	}
	
	function loadlist(_this) {
		var url = "http://localhost/Joomla/modules/mod_delivery/helper.php?from=" + _this.value;
		alert(url);
		loadXMLDoc("get", url);
	}
	
	function getCities(xml) {
		var cities = XML.getElementsByTagName("city");
		var _select = document.getElementById("to");
		_select.innerHTML = "";
		
		for (i=0; i<colors.length; i++) { 
			var option = document.createElement("option");
			var opttext  = document.createTextNode(cities[i].firstChild.data);
			option.appendChild(opttext);
			option.setAttribute("value",cities[i].getAttribute("value"));
			_select.appendChild(option);
		} 
	}
</script>

if (isset($_GET['from'])) { ModDeliveryHelper::makeXML(); }

var url="index.php?"+this.getValue;
var a=new Ajax(url,{
method:"get",
update:$("bla-bla")
}).request();

var url="index.php?option=helper&format=raw&task=myphpclass::myphpmethod&item=this.value;

<?php
// no direct access
defined('_JEXEC') or die('Restricted access');
// Include the syndicate functions only once
require_once (dirname(__FILE__).DS.'helper.php');
$document = &Jfactory::getDocument();
$js = "/modules/".$this->template."/mod_mymod.js";
$document->addScript(JURI::base(). $js);
$items = ModDeliveryHelper::get_DDList();
require(JModuleHelper::getLayoutPath('mod_mymod));
?>

<?php 
	defined('_JEXEC') or die('Restricted access'); 
	JHTML::_('behavior.mootools');

	echo JText::_('Choose the departure and destination cities');
	echo "<br><table>";
	echo "<tr><td>";

	$cat[] = JHTML::_('select.option','0','Select the city','value','text');
	$cat = @array_merge($cat, $items);
	$list1 = JHTML::_(
					'select.genericlist',
					$cat,
					'from',
					'class="inputbox" size="1" style="width: 130px"',
					'text',
					'text',
					0
				);
	
	echo $list1;
	echo "</td></tr><tr><td id=\"secondlist\"></td></tr></table>";
?> 

<?php
defined('_JEXEC') or die('Restricted access');

function loadlist() {
	if ($city = JRequest::getVar('from','','get','string')) {
		$_db = & JFactory::getDBO();
		$_query = "SELECT b AS TEXT FROM #__mytable WHERE a = $city)";			
		$_db->setQuery($_query);
		$_items = $_db->loadObjectList();
		$list2 = & JHTML::_(
					'select.genericlist',
					$_items,
					'to',
					'class="inputbox" size="1" style="width: 130px"',
					'text',
					'text',
					0
				);
		if (!$list2) $response['html'] = '';
		$response['html'] = $list2;

		echo (json_encode($response));
		
		return;
	}
	else echo "no delivery";
}

class ModDeliveryHelper {
		public function get_DDList() {
			$db	=& JFactory::getDBO();
			$query = 'SELECT DISTINCT a AS text' .
				' FROM #__mytable ORDER BY a';
			$db->setQuery($query);
			$items = $db->loadObjectList();
			
			return $items;
		}
	}
?>

<script type="text/javascript">
	window.addEvent("domready", function() {
		alert(this.getValue());
		var fx = new Fx.Style($("console-container"), "background-color", {duration:2000})
		$("from").addEvent("change", function() {
			$("secondlist").empty().addClass("ajax-loading");
			var url="index.php?option=com_delivery&format=raw&task=loadlist&from=" + this.getValue();
			var theAjax = new Ajax(url, {
				method: "get",
				onComplete: function(response) {
					var resp = Json.evaluate(response);
					$("secondlist").removeClass("ajax-loading").setHTML(resp.HTML);
					$("console-container").setHTML(resp.msg);
					x.set("#fff").start("#f60").chain(function(){
						this.start.delay(2000,this,"#000");
					});
				}
			}).request();
		});
	});
</script>

<?xml version="1.0" encoding="utf-8"?>
<install type="module" version="1.5.0">
        <name>my mod</name> 
        <author>asdf</author> 
        <creationDate>October 2009</creationDate> 
        <copyright>All rights reserved by Ambitionality Software LLC 2008.</copyright> 
        <license>GPL 2.0</license> 
        <authorEmail>asdf@asdf.com</authorEmail> 
        <authorUrl>www.joomla.org</authorUrl> 
        <version>1.0.0</version> 
        <description>my mod</description>
        <files>
                <filename module="mod_mymod">mod_mymod.php</filename>
                <filename>index.html</filename>
				<filename>helper.php</filename>
				<filename>tmpl/index.html</filename>
				<filename>tmpl/default.php</filename>
        </files>
        <params />
</install>

window.addEvent("domready", function() {
		$("from").addEvent("change", function() {
			var from_value = $("from").get("value");
			var url="<?php echo JURI::base();?>index.php?option=com_delivery&task=loadlist&from=" + from_value;
			var theAjax = new Ajax(url, {
				method: "get",
				onComplete: function(myresponse) {	
					var resp = Json.evaluate(myresponse);
					$("my_form").setHTML(resp.html);
				}
			}).request();
		});
	});

		function loadlist() {
	if ($city = JRequest::getVar('from','','get','string')) {
		$_db = & JFactory::getDBO();
		$_query = "SELECT a AS TEXT FROM #__my_table WHERE b = '$city')";			
		$_db->setQuery($_query);
		$_items = $_db->loadObjectList();
		$list2 = JHTML::_(
					'select.genericlist',
					$_items,
					'to',
					'class="inputbox" size="1" style="width: 130px"',
					'text',
					'text',
					0
				);
		
		$response['html'] = $list2;
		$response['text'] = "OK";
			
		echo (json_encode($list2));
		
		return;
	}
}

<?php
defined( '_JEXEC' ) or die( 'Restricted access' );
switch ($task)
	{
	case 'loadlist';
		if ($city = JRequest::getVar('from','','get','string')) {
		$_db = & JFactory::getDBO();
		$_query = "SELECT a AS TEXT FROM #__my_table WHERE b = '$city')";			
		$_db->setQuery($_query);
		$_items = $_db->loadObjectList();
		$list2 = JHTML::_(
					'select.genericlist',
					$_items,
					'to',
					'class="inputbox" size="1" style="width: 130px"',
					'text',
					'text',
					0
				);
		
		$response['html'] = $list2;
		$response['text'] = "OK";
			
		echo (json_encode($list2));

	break;
	default:
	break;
	}

?>

<script type='text/javascript'>
	window.addEvent('domready', function() {
		$('from').addEvent('change', function(e) {
			var from_value = $('from').get('value');
			var url='<?php echo JURI::base(); ?>index.php?option=com_delivery&task=loadlist&from=' + from_value;
			alert(url);
			new Ajax(url, {
				method: 'get',
				onComplete: function(myresponse) {	
					var resp = Json.evaluate(myresponse);
					$('list2').setHTML(resp.html);
				}
			}).request();
		});
	});

</script>
<?php
JHTML::_('behavior.mootools');
...
echo '<div id=\'list1\'>' . $list1 . '</div><BR><div id=\'list2\'></div>';
...
?>

<?xml version="1.0" encoding="utf-8"?>
<install type="component" version="1.5.0">
    <name>ajax</name>
    <author>me</author>
    <creationDate>2009</creationDate>
    <license>GNU/GPL</license>
    <version>1.0</version>
    <description>ajax response</description>
    <install>
        <queries>
           
        </queries>
    </install>
    <files>
		<filename>com_ajax.php</filename>
    </files>
    <administration>
    </administration>
    <params>
    </params>
</install>

$city = JRequest::getVar('from','','get','string');
		$_db = & JFactory::getDBO();
		$_query = "SELECT b AS TEXT FROM #__mytable WHERE a = '$city' ORDER BY b";
		$_db->setQuery($_query);
		$_items = $_db->loadObjectList();
		$_cat[] = JHTML::_('select.option','0',' ','value','text');
		$_cat = @array_merge($_cat, $_items);
		$list2 = JHTML::_(
			'select.genericlist',
			$_cat,
			'to',
			'class="inputbox" size="1" style="width: 130px"',
			'text',
			'text',
			0
		);
		
		$response['html'] = $list2;
		
		echo (json_encode($response));
				
		return;