validate有一些使用心得

validate自定义方法使用
实例1：检测用户是否已经存在

$.validator.addMethod(
        "checkUser",
        function(value,element,params){
            var isExisted = false;
            $.ajax({

                "async":false, 
                "data":{"username":value},
                "url":"${pageContext.request.contextPath}/checkUser",
                "type":"POST",
                "dataType":"json",
                "success":function(data){
                    isExisted = data.isExisted;
                }

            });     
            return !isExisted;
        }
    );

实例2：验证码校验

$.validator.addMethod(

    "isChecked",
    function(value,element,params){
        var checked = false;

        $.ajax({
            "async":false, 
            "data":{"code":value},
            "url":"${pageContext.request.contextPath}/checkVCode",
            "type":"POST",
            "dataType":"json",
            "success":function(data){
                checked = data.checked;

            }

        });

        return checked;

}

相关知识点介绍：