onfocus Event
 Complete Event Object Reference
Definition and Usage
The onfocus event occurs when an object gets focus.
Syntax
onfocus="SomeJavaScriptCode"
|
| Parameter |
Description |
| SomeJavaScriptCode |
Required. Specifies a JavaScript to be executed when the
event occurs. |
Supported by the following HTML tags:
|
<a>, <acronym>, <address>, <area>, <b>, <bdo>, <big>, <blockquote>,
<button>, <caption>, <cite>, <dd>, <del>, <dfn>, <div>, <dl>, <dt>, <em>, <fieldset>,
<form>, <frame>, <frameset>, <h1> to <h6>, <hr>, <i>, <iframe>, <img>,
<input>, <ins>, <kbd>, <label>, <legend>, <li>, <object>, <ol>, <p>, <pre>,
<q>, <samp>, <select>, <small>, <span>, <strong>, <sub>, <sup>, <table>, <tbody>,
<td>, <textarea>, <tfoot>, <th>, <thead>, <tr>, <tt>, <ul>, <var> |
Supported by the following JavaScript objects:
|
button, checkbox, fileUpload, layer, frame, password, radio, reset, select, submit,
text, textarea, window |
Example
In this example the background color of the input fields change when they get
focus:
<html>
<head>
<script type="text/javascript">
function setStyle(x)
{
document.getElementById(x).style.background="yellow"
}
</script>
</head>
<body>
First name: <input type="text"
onfocus="setStyle(this.id)" id="fname">
<br />
Last name: <input type="text"
onfocus="setStyle(this.id)" id="lname">
</body>
</html>
|
The output of the code above will be:
Try-It-Yourself Demos
onfocus
How to use onfocus.
Complete Event Object Reference
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