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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
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 |
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> <body> First name: <input type="text" </body> |
The output of the code above will be:
输出结果为:
First name: Last name: |
onfocus
How to use onfocus.
如何应用onfocus