jQuery change() Method

Last Updated : 11 Jan, 2024

jQuery change() is an inbuilt method that is used to detect the change in the value of input fields. This method works only on the “<input>, <textarea> and <select>” elements.

Syntax:

$(selector).change(function)

Parameters:

It accepts an optional parameter “function”.

Example 1: In the below code, no function is passed to the change method.

HTML

<!DOCTYPE html>
<html>
 
<head>
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
 
    <!--Demo of change method without passing function-->
    <script>
        $(document).ready(function () {
            $("button").click(function () {
                $("input").change();
            });
        });
    </script>
</head>
 
<body>
    <p>Click the button to see the changed value !!!</p>
    <!--click on this button and see the change -->
    <button>Click Me!</button>
    <p>Enter value:
        <input value="GeeksforGeeks"
               onchange="alert(this.value)"
               type="text">
    </p>
</body>
 
</html>

Output:

Example 2: In the below code, function is passed to the change method.

HTML

<!DOCTYPE html>
<html>
 
<head>
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
 
    <!--Here function is passed to the change method-->
    <script>
        $(document).ready(function () {
            $(".field").change(function () {
                $(this).css("background-color", "#7FFF00");
            });
        });
    </script>
 
    <style>
        .field {
            padding: 5px;
        }
    </style>
</head>
 
<body>
    <!--write something and click outside -->
    Enter Value:
    <input class="field" type="text">
    <p>
        Write something in the input field, and then
        press enter or click outside the field.
    </p>
</body>
 
</html>