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jQuery delegate() Method

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jQuery delegate() Method in jQuery is used to add one or more event handlers to the specified element that are children of selected elements and is also used to specify a function to run whenever the event occurs.

Syntax:

$(selector).delegate( childSelector, event, data, function )

Parameters:

This method accepts four parameters as mentioned above and described below:

  • childSelector: It is a required parameter and is used to specify one or more child elements attached to the event handler.
  • event: It is a required parameter and is used to specify one or more events attached to the elements. Multiple event values are separated by space and it must be a valid event.
  • data: It is an optional parameter and is used to specify the additional data to pass along the function.
  • function: It is a required parameter and is used to specify the function to run when the event occurs.

Example 1:

html

<!DOCTYPE html>
<html>
 
<head>
    <title>
        delegate() Method in jQuery
    </title>
 
    <script src=
    </script>
 
    <!-- jQuery script to add events -->
    <script>
        $(document).ready(function () {
            $("div").delegate("h3", "click", function () {
                $("h3").css("background-color", "green");
            });
        });
    </script>
</head>
 
<body>
    <center>
        <h1>Welcome to GeeksforGeeks!</h1>
 
        <p>
            Click on the below element (lightgreen
            background) to change background-color
        </p>
 
        <div style="background-color:lightgreen;">
            <h3>GeeksForGeeks</h3>
        </div>
 
        <h3>GeeksForGeeks.</h3>
    </center>
</body>
 
</html>

                    

Output:

jquery-67

Example 2:

html

<!DOCTYPE html>
<html>
 
<head>
    <title>
        delegate() Method in jQuery
    </title>
 
    <script src=
    </script>
 
    <!-- jQuery script for delegate() method -->
    <script>
        $(document).ready(function () {
            $("div").delegate("h3", "click", function () {
                $(this).slideToggle();
            });
 
            $("button").click(function () {
                $("<h3>This show how the delegate Method"
                    + " works .</h3>").insertAfter("button");
            });
        });
    </script>
</head>
 
<body>
    <center>
        <h1>Welcome to GeeksforGeeks!.</h1>
 
        <div style="background-color:green">
 
            <h3>GeeksforGeeks.</h3>
            <h3>The delegate Method.</h3>
 
            <button>Click</button>
        </div>
    </center>
</body>
 
</html>

                    

Output:

jquery-68



Last Updated : 11 Jan, 2024
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