为jQuery验证插件添加规则 [英] Adding a rule for jQuery validation plugin

问题描述

我正在使用以下规则使用jQuery验证方法来验证用户名.我想添加另一个规则，即用户名应仅包含字母数字和下划线字符. 我如何为该规则添加其他方法.如果用户输入的字符少于4个，是否可以打印最小长度错误消息，如果用户输入的字符无效，则是否给出无效字符错误消息?谢谢.

I'm using following rules to validate the username using jQuery validation method. I want to add another rule that username should contain only alphanumeric and underscore character. How can i add additional method for that rule. Is it possible that if user gives less than 4 characters, then I print the minimum length error message, and if the user gives invalid characters, then I give the invalid character error message? Thanks.

$(document).ready(function() {
$("#sform").validate({
            rules: {
                username: {
                    required: true,
                    minlength: 4
                }
            },

            messages: {
                username: "Minimum length 4.",              
            }
        });
    });

推荐答案

添加如下内容

jQuery.validator.addMethod("alphanumeric", function(value, element) {
    return !jQuery.validator.methods.required(value, element) || /^[a-zA-Z0-9_]+$/i.test(value);
}
, "Letters, numbers or underscores only please"); 

并在下面申请

$('validatorElement').validate({
    rules : {
        username : { alphanumeric : true }
    }
});

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