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Remove a certain type of event listener from an element in JavaScript

Description

The following code shows how to remove a certain type of event listener from an element.

Example


<!DOCTYPE HTML>
<html>
<head>
<style type="text/css">
p {<!--from  ww  w.  j a  va2s  . c  om-->
background: gray;
color: white;
padding: 10px;
margin: 5px;
border: thin solid black
}
</style>
</head>
<body>
<p>This is a test.</p>
<p id="block2">This is a test.</p>
<button id="pressme">Press Me</button>
<script type="text/javascript">
var pElems = document.getElementsByTagName("p");
for ( var i = 0; i < pElems.length; i++) {
pElems[i].addEventListener("mouseover", handleMouseOver);
pElems[i].addEventListener("mouseout", handleMouseOut);
}
document.getElementById("pressme").onclick = function() {
document.getElementById("block2").removeEventListener("mouseout",handleMouseOut);
}
function handleMouseOver(e) {
e.target.innerHTML += "mouseover";
e.target.style.background = 'red';
e.target.style.color = 'black';
}
function handleMouseOut(e) {
e.target.innerHTML += "mouseout";
e.target.style.removeProperty('color');
e.target.style.removeProperty('background');
}
</script>
</body>
</html>

Click to view the demo

The code above generates the following result.

Remove a certain type of event listener from an element in JavaScript
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