首頁 > 開發者 > JavaScript
登陸頁面需要撲捉使用者按下斷行符號自動認可的需求:
在body裡添加onkeydown事件跳javascript在提交表單。
尋找文檔如下
onkeydown 事件會在使用者按下一個鍵盤按鍵時發生。
文法：onkeydown="SomeJavaScriptCode"
支援該事件的html標籤;
複製代碼 代碼如下:
<a>, <acronym>, <address>, <area>, <b>, <bdo>, <big>, <blockquote>, <body>, <button>, <caption>, <cite>, <code>, <dd>, <del>, <dfn>, <div>, <dt>, <em>, <fieldset>, <form>, <h1> to <h6>, <hr>, <i>, <input>, <kbd>, <label>, <legend>, <li>, <map>, <object>, <ol>, <p>, <pre>, <q>, <samp>, <select>, <small>, <span>, <strong>, <sub>, <sup>, <table>, <tbody>, <td>, <textarea>, <tfoot>, <th>, <thead>, <tr>, <tt>, <ul>, <var>
支援該事件的javascript對象：
document, image, link, textarea瀏覽器差異：
Internet Explorer 使用 event.keyCode 取回被按下的字元，而 Netscape/Firefox/Opera 使用 event.which。
執行個體：在本例中，使用者無法在輸入框中鍵入數字
複製代碼 代碼如下:
<html>
<body>
<script type="text/javascript">
function noNumbers(e)
{
var keynum
var keychar
var numcheck
if(window.event) // IE
{
keynum = e.keyCode
}
else if(e.which) // Netscape/Firefox/Opera
{
keynum = e.which
}
keychar = String.fromCharCode(keynum)
numcheck = /\d/
return !numcheck.test(keychar)
}
</script>
<form>
<input type="text" onkeydown="return noNumbers(event)" />
</form>
</html>
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
