jQuery | change() with Examples

Last Updated : 16 Apr, 2020

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

Syntax :

$(selector).change(function)

Parameter: It accepts an optional parameter “function”.
Return Value: It returns the element with the modification.
jQuery code to show the working of change() method:
Code #1:
In the below code, no function is passed to the change method.

<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="Donald" onchange="alert(this.value)"
        type="text"></p>
</body>
  
</html>

Output:
Before clicking the “Click Me” button-

After clicking the “Click Me” button-

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

<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>

Output:
Before entering any values to the “Enter Value:” box-

After entering a values of “GeeksforGeeks” to the “Enter Value:” box and clicking outside of the box-

My Personal Notes

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