JQuery中一个简单的表单验证的实例
html代码如下：
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd“>
<html xmlns=”http://www.w3.org/1999/xhtml“>
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ />
<title></title>
<link href=”css/style.css” rel=”stylesheet” type=”text/css” />
<!– 引入jQuery –>
<script src=”../scripts/jquery-1.3.1.js” type=”text/javascript”></script>
<script type=”text/javascript”>
//<![CDATA[
$(function(){
//如果是必填的，则加红星标识
$(“form :input.required”).each(function(){
var $required = $(“<strong class=\’high\’> *</strong>”); //创建元素
$(this).parent().append($required); //然后将它追加到文档中
});
//文本框失去焦点后
$(\’form :input\’).blur(function(){
var $parent = $(this).parent();
$parent.find(“.formtips”).remove();
//验证用户名
if($(this).is(\’#username\’)){
if(this.value==”” || this.value.length < 6){
var errorMsg = \’请输入至少6位的用户名.\’;
$parent.append(\'<span class=”formtips onError”>\’+errorMsg+\'</span>\’);
}else{
var okMsg = \’输入正确.\’;
$parent.append(\'<span class=”formtips onSuccess”>\’+okMsg+\'</span>\’);
}
}
//验证邮件
if($(this).is(\’#email\’)){
if(this.value==”” || ( this.value!=”” && !/.+@.+\.[a-zA-Z]{2,4}$/.test(this.value)){
var errorMsg = \’请输入正确的E-Mail地址.\’;
$parent.append(\'<span class=”formtips onError”>\’+errorMsg+\'</span>\’);
}else{
var okMsg = \’输入正确.\’;
$parent.append(\'<span class=”formtips onSuccess”>\’+okMsg+\'</span>\’);
}
}
}).keyup(function(){
$(this).triggerHandler(“blur”);
}).focus(function(){
$(this).triggerHandler(“blur”);
});//end blur
//提交，最终验证
$(\’#send\’).click(function(){
$(“form :input.required”).trigger(\’blur\’);
var numError = $(\’form .onError\’).length;
if(numError){
return false;
}
alert(“注册成功,密码已发到你的邮箱,请查收.”);
});
//重置
$(\’#res\’).click(function(){
$(“.formtips”).remove();
});
})
//]]>
</script>
</head>
<body>
<form method=”post” action=””>
<div class=”int”>
<label for=”username”>用户名:</label>
<input type=”text” id=”username” class=”required” />
</div>
<div class=”int”>
<label for=”email”>邮箱:</label>
<input type=”text” id=”email” class=”required” />
</div>
<div class=”int”>
<label for=”personinfo”>个人资料:</label>
<input type=”text” id=”personinfo” />
</div>
<div class=”sub”>
<input type=”submit” value=”提交” id=”send”/><input type=”reset” id=”res”/>
</div>
</form>
</body>
</html>