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Demonstrate Event Capture and Bubble and event Phase in JavaScript

Description

The following code shows how to demonstrate Event Capture and Bubble and event Phase.

Example


<html>
<head>
<script type="text/javascript">
function init() {<!-- w w w. j a v a2s  . c  o  m-->
window.onclick = winEvent;
document.onclick = docEvent;
document.body.onclick = docBodEvent;
document.addEventListener("click", docEvent, true);
document.forms[0].addEventListener("click", formCaptureEvent, true);
document.forms[0].addEventListener("click", formBubbleEvent, false);
}
function winEvent(evt) {
alert("window object level (" + getPhase(evt) + ").");
}
function docEvent(evt) {
alert("Document level (" + getPhase(evt) + ").");
}
function docBodEvent(evt) {
alert("BODY level (" + getPhase(evt) + ").");
}
function formCaptureEvent(evt) {
alert("FORM only on CAPTURE.");
}
function formBubbleEvent(evt) {
alert("FORM only on BUBBLE.");
}
function getPhase(evt) {
switch (evt.eventPhase) {
case 1:
return "CAPTURING";
break;
case 2:
return "AT TARGET";
break;
case 3:
return "BUBBLING";
break;
default:
return "";
}
}
</script>
</head>
<body onload="init()">
<form>
<input type="button" value="Button 'main1'" name="main1" onclick="alert('button (' + getPhase(event) + ').')" />
</form>
</body>
</html>

Click to view the demo

The code above generates the following result.

Demonstrate Event Capture and Bubble and event Phase in JavaScript
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