前端——JQuery表单验证插件

素颜马尾好姑娘i 2021-09-30 02:34 459阅读 0赞

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},	
    			"password":{"required":true,"rangelength":[6,12]},
    			"repassword":{"required":true,"rangelength":[6,12],"equalTo":"#password"},	
    			"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"}
    		}
    	})
    })

![1251900-20180219100959345-1658544560.png][]

3、定义错误标签样式

![1251900-20180219101834501-2082938893.png][]

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;
    
    		$.ajax({
    			"async":false,	
    			"data":{"username":value},
    			"dataType":"json",
    			"type":"POST",
    			"url":"${pageContext.request.contextPath}/checkUsername",
    			"success":function (dat) {
    				flag=dat.isExist;
    			}
    
    		});
    
    		//返回false代表该校验器不通过
    		return !flag;
    	}
    );

转载于:https://www.cnblogs.com/x54256/p/8453559.html

[1251900-20180219100959345-1658544560.png]: /images/20210725/05a6e69de0be433298c51b6a2a495139.png
[1251900-20180219101834501-2082938893.png]: /images/20210725/8368860b4cfc42048d5093d3a439654d.png