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jQuery | change() with Examples

The change() is an inbuilt method in jQuery that is used to change the value of the input fields. This method is worked 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>
               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>
                  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-



This article is attributed to GeeksforGeeks.org

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