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JavaScript onfocus 事件

作者:w3pop.com 翻译/整理:w3pop.com 发布:2007-04-28 浏览:5811 :: ::

Definition and Usage
定义与用法

The onfocus event occurs when an object gets focus.
当一个对象处于被选种状态时触发onfocus事件

Syntax
语法

onfocus="所要执行的脚本"

Parameter
参数		 Description
注释
SomeJavaScriptCode
所要执行的脚本		 Required. Specifies a JavaScript to be executed when the event occurs.
必选项。当事件触发时所要执行的脚本

Supported by the following HTML tags:
所支持的HTML标签：

<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:
所支持的JavaScript对象：

button, checkbox, fileUpload, layer, frame, password, radio, reset, select, submit, text, textarea, window

Example
实例

In this example the background color of the input fields change when they get focus:
在下面的例子中，当文本框被选种时其背景颜色将改变：

<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:
输出结果为：

First name:
Last name:

Try-It-Yourself Demos
互动演练

onfocus
How to use onfocus.
如何应用onfocus

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