JavaScript onfocus Event
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> |
JavaScript onfocus Event
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