mootools

References to Documentation

1. Element/Element-Event.js#Element.addEvent
2. Remote/Ajax.js#Ajax

$('start').addEvent('click', function(e) {
	e = new Event(e).stop();
 
	var url = "/demos/Ajax/lipsum.html";
 
	/**
	 * The simple way for an Ajax request, use onRequest/onComplete/onFailure
	 * to do add your own Ajax depended code.
	 */
	new Ajax(url, {
		method: 'get',
		update: $('log')
	}).request();
});
 

<h3>Simple Ajax Request</h3>
<p><a id="start" href="#">Click here</a> to start Ajax request</p>
<div id="log">
	<p>Waiting...</p>
</div>

#log {
	background: #f8f8f8;
	border: 1px solid #d6d6d6;
	border-left-color: #e4e4e4;
	border-top-color: #e4e4e4;
	padding: 0.3em;
	margin-top: 10px;
}
 
#start a { 
	font-weight: bold;
}