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之前做客户端验证感觉自己javascript 不行,虽然能写出来一完整的验证,但从不自信，一直觉得客户端验证是比较繁琐的事情,但是又不能不做,只到最开始接触ajax ,遇到了一个jQuery validation 的插件,在网上看功能比较强大,而且看起来比较容易,所以就尝试一下,效果还真不错!

jQuery validation 插件提供的一些DEMO.在这些DEMO 都是一些比较常用而且很好的例子:中间

$.validator.setDefaults({
debug: true
});
设置默认的状态为debug，这样用户的数据就不会提交了。

接下来是一段比较长的代码，但是不用怕，因为真的挺简单的//当页面载入完成时，执行以下动作
$().ready(function() {

//验证指定表单
$("#myform").validate({
//设置默认的状态为keyup，也可以设置为blur
event: "keyup", //触发验证的事件
//设定规则
rules: {
//对应id为'username'的input
username: {
//必填项
required: true,
//最多和最少的字符数
rangeLength:[4,16]
},
mail: {
required: true,
//声明这是一个电子邮件
email: true
},
password: {
required: true,
//最少4个字符
minLength: 4
},
confirm_password: {
required: true,
minLength: 4,
// 与哪个等同，这里是id为password的input等同
equalTo: "#password"
},
agree: "required"

},

//这里是与规则对应的错误代码
messages: {
username: {
//如果用户名为空，则显示下面的信息
required: '请输入用户名',
//如果字符串的长度不符合，则显示下面的信息
rangeLength: '用户名必须在4-16个字符之间'
},
password: {
required: '请输入密码',
minLength: '密码必须大于4个字符'
},
confirm_password: {
required: '请确认你的密码',
equalTo: '两次密码输入不一致',
minLength: '密码必须大于4个字符'
},
agree: '请同意我们的条款',
mail: '请输入有效的E-MAIL帐户'
}
});
});

下面是一个比较简单的例子:

HTML 代码:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=gbk" />
        <title>jQuery验证</title>

        <link rel="stylesheet" href="theme.css" type="text/css"/>
        <script src="jquery.js"   type="text/javascript"></script>
        <script type="text/javascript" src="jquery.validate.js"></script>
        <script type="text/javascript" src="fv.js"></script>

    </head>
    <body>
        <form class="cmxform" id="signupForm" method="get" action="">
    <fieldset>
        <legend>Validating a complete form</legend>
        <p>
            <label for="firstname">Firstname</label>
            <input id="firstname" name="firstname" />
        </p>
        <p>
            <label for="lastname">Lastname</label>
            <input id="lastname" name="lastname" />
        </p>
        <p>
            <label for="username">Username</label>
            <input id="username" name="username" />
        </p>
        <p>
            <label for="password">Password</label>
            <input id="password" name="password" type="password" />
        </p>
        <p>
            <label for="confirm_password">Confirm password</label>
            <input id="confirm_password" name="confirm_password" type="password" />
        </p>
        <p>
            <label for="email">Email</label>
            <input id="email" name="email" />
        </p>
        <p>
            <label for="agree">Please agree to our policy</label>
            <input type="checkbox" id="agree" name="agree" />
        </p>
        <p>
            <input class="submit" type="submit" value="Submit"/>
        </p>
    </fieldset>
</form>
    </body>
</html>

JS 代码也不是jquery validation 验证代码:

//验证通过表单提交的方式
$.validator.setDefaults({
    submitHandler: function() { alert("submitted!"); }
});

$().ready(function() {
    // validate signup form on keyup and submit
    $("#signupForm").validate({
        rules: { //验证规则定义
            firstname: "required",
            lastname: "required",
            username: {
                required: true,
                minlength: 2
            },
            password: {
                required: true,
                minlength: 5
            },
            confirm_password: {
                required: true,
                minlength: 5,
                equalTo: "#password"
            },
            email: {
                required: true,
                email: true
            },
            topic: {
                required: "#newsletter:checked",
                minlength: 2
            },
            agree: "required"
        },
        messages: {    //验证错误信息配置
            firstname: "Please enter your firstname",
            lastname: "Please enter your lastname",
            username: {
                required: "Please enter a username",
                minlength: "Your username must consist of at least 2 characters"
            },
            password: {
                required: "Please provide a password",
                minlength: "Your password must be at least 5 characters long"
            },
            confirm_password: {
                required: "Please provide a password",
                minlength: "Your password must be at least 5 characters long",
                equalTo: "Please enter the same password as above"
            },
            email: "Please enter a valid email address",
            agree: "Please accept our policy"
        }
    });
    /**
        验证确认密码通过后,更改密码时,验证确认密码的合法性
    **/
    $("#password").blur(function() {
        $("#confirm_password").valid();
    });

    success: function(label) {
        label.html('√').addClass("success");
    }
});

另外就是css 样式文件:

#signupForm { width: 670px;}
#signupForm label.error {
    margin-left: 10px;
    width: auto;
    display: inline;
}
#newsletter_topics label.error {
    display: none;
    margin-left: 103px;
}
body{
    font-size:16px;
    color:blue;
}
form.cmxform label.error, label.error {
    /* remove the next line when you have trouble in IE6 with labels in list */
    color: red;
    font-style: normal
}
div.error { display: none; }
input {    border: 1px solid black; }
input:focus { border: 1px dotted black; }
input.error { border: 1px dotted red; }