jQuery change() Method
The jQuery change() method is used to detect changes in the value of form elements like <input>, <select>, or <textarea>. It triggers a specified function when a user modifies the input or selects a different option.
Syntax
$(selector).change(function)Parameters : It accepts an optional parameter “function”.
Example 1: In this example we demonstrates the change() method. When the button is clicked, the input field triggers the change() event, displaying an alert with the input’s updated value.
<!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 this example we applies the change() method to an input field. When the field value is modified and focus is lost, the input’s background color changes to light green (#7FFF00).
<!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>
Output:
jQuery change() Method – FAQs
When is the change() event triggered in jQuery?
The change() event is triggered when the value of the input element is modified and the element loses focus, or when a new option is selected in a dropdown.
Can the change() method be used with dropdown menus (<select>) in jQuery?
Yes, it can detect when the user selects a new option in a dropdown menu and trigger a function.
Does the change() event fire immediately when a user types in an input field?
No, it only fires when the user modifies the field and then clicks outside (loses focus) or presses Enter.
How can I trigger the change() event programmatically in jQuery?
You can trigger the change() event manually by calling $(“input”).change().
Can the change() method work with radio buttons?
Yes, change() can be used to detect when the user selects a new radio button option.
