The jQuery undelegate() method is an inbuilt method that is used to remove the specified event handler from the selected element.
Syntax:
$(selector).undelegate(selector, event, function)
Parameters: This method accepts three parameters as mentioned above and described below:
- selector: It is an optional parameter that is used to specify the selector from which the event will remove.
- event: It is an optional parameter that is used to specify the name of the event type on the selector.
- function: It is an optional parameter that is used to specify the name of the handler function to remove.
The below examples illustrate the undelegate() method in jQuery:
Example 1: This example does not contain any parameters.
<!DOCTYPE html>
<html>
<head>
<title>The undelegate Method</title>
<script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<!-- jQuery code to show the working of this method -->
<script>
$(document).ready(function () {
$("body").delegate("p", "click", function () {
$(this).css("font-size", "25px");
});
$("button").click(function () {
$("body").undelegate();
});
});
</script>
<style>
div {
width: 300px;
height: 100px;
background-color: lightgreen;
padding: 20px;
font-weight: bold;
font-size: 20px;
border: 2px solid green;
}
button {
margin-top: 10px;
}
</style>
</head>
<body>
<div>
<!-- click on this p element -->
<p>Welcome to GeeksforGeeks!.</p>
</div>
<!-- click on this button to remove the
event handler -->
<button>Remove...!</button>
</body>
</html>
Output:
Note: First click on the button and then click on the paragraph, then no changes occur.
Example 2: This example contains all parameters.
<!DOCTYPE html>
<html>
<head>
<title>The undelegate Method</title>
<script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<!-- jQuery code to show the working of this method -->
<script>
$(document).ready(function () {
$("body").delegate("div", "click", function () {
$(this).animate({
height: "+=100px"
});
$(this).animate({
width: "+=100px"
});
});
$("button").click(function () {
$("body").undelegate("div", "click");
});
});
</script>
<style>
div {
width: 30px;
height: 30px;
background-color: green;
}
button {
margin-top: 10px;
}
</style>
</head>
<body>
<div></div>
<!-- click on this button -->
<button>Click here..!</button>
</body>
</html>
Output:
Note: If click on the button and then click on the div element then no change in the size will take place.
