<html>
<head>
<title>W3C DOM Event Propagation</title>
<script type="text/javascript">
function init() {
document.body.onclick = docBodEvent;
document.addEventListener("click", docEvent, true);
document.forms[0].addEventListener("click", formCaptureEvent, true);
document.forms[0].addEventListener("click", formBubbleEvent, false);
}
function docBodEvent(evt) {
if (evt.target.type == "button") {
alert("BODY");
}
}
function formCaptureEvent(evt) {
if (evt.target.type == "button") {
alert("This alert triggered by FORM only on CAPTURE.");
if (document.forms[0].stopAllProp.checked) {
evt.stopPropagation();
}
}
}
function formBubbleEvent(evt) {
if (evt.target.type == "button") {
alert("This alert triggered by FORM only on BUBBLE.");
if (document.forms[0].stopDuringBubble.checked) {
evt.preventBubble();
}
}
}
</script>
</head>
<body onload="init()">
<form>
<input type="checkbox" name="stopAllProp" />Stop all propagation at FORM
<input type="checkbox" name="stopDuringBubble" />Prevent bubbling past FORM
<input type="button" value="Button 'main1'" name="main1" onclick="alert('button')" />
</form>
</body>
</html>