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onchange Event

Event Object Reference Complete Event Object Reference

Definition and Usage

The onchange event occurs when the content of a field changes.

Syntax

onchange="SomeJavaScriptCode"

Parameter Description
SomeJavaScriptCode Required. Specifies a JavaScript to be executed when the event occurs.

Supported by the following HTML tags:

<input type="text">, <select>, <textarea>

Supported by the following JavaScript objects:

fileUpload, select, text, textarea

Example

In this example we will execute some JavaScript code when a user changes the content of an input field:

<html>
<head>
<script type="text/javascript">
function upperCase(x)
{
var y=document.getElementById(x).value
document.getElementById(x).value=y.toUpperCase()
}
</script>
</head>
<body>
Enter your name:
<input type="text" id="fname"
onchange="upperCase(this.id)">
</body>
</html>

The output of the code above will be:

Enter your name:

Try-It-Yourself Demos

onchange
How to use the onchange event to execute some JavaScript code when a user changes the content of an input field.

Event Object Reference Complete Event Object Reference

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