1、引入JQuery插件（依赖JQuery）
<script src="js/jquery-1.11.3.min.js" type="text/javascript"></script>
<script src="js/jquery.validate.min.js" type="text/javascript"></script>
2、定义校验规则
键是标签的名字
$(function () {
$("#myform").validate({
rules:{
"username":{"required":true,"checkUsername":true}, <!--自定义校验-->
"password":{"required":true,"rangelength":[6,12]},
"repassword":{"required":true,"rangelength":[6,12],"equalTo":"#password"}, <!--寻找id=password的标签，进行内容对比-->
"email":{"required":true,"email":true},
"sex":{"required":true},
"birthday":{"required":true,"date":true},
"checkCode":{"required":true}
},
messages:{
"username":{"required":"用户名不能为空","checkUsername":"用户名已存在"},
"password":{"required":"密码不能为空","rangelength":"密码长度6-12位"},
"repassword":{"required":"密码不能为空","rangelength":"密码长度6-12位","equalTo":"两次密码输入不一致"},
"email":{"required":"邮箱不能为空","email":"邮箱格式不正确"},
"birthday":{"required":"出生日期不能为空","date":"请输入正确的日期格式"},
"checkCode":{"required":"请输入验证码"}
}
})
})
3、定义错误标签样式
插件会自动寻找第一个匹配name=“xxx”的标签，在它后面添加一个错误标签（class="error"）
所以单选框会出现错误，所以要在你想要在的位置加上如下代码：
<label class="error" for="sex" style="display: none">性别不能为空</label>
4、自定义校验规则
$.validator.addMethod(
"checkUsername",
function (value,element,params) {
//value:输入的内容
//element:被校验的元素对象
//params：规则对应的参数值
//目的：对输入的username进行ajax校验
var flag = false;
$.ajax({
"async":false, <!--是否异步-->
"data":{"username":value},
"dataType":"json",
"type":"POST",
"url":"${pageContext.request.contextPath}/checkUsername",
"success":function (dat) {
flag=dat.isExist;
}
});
//返回false代表该校验器不通过
return !flag;
}
);
