对于一个项目的表单验证，方式有很多，效果也有很多，具体使用哪种完成取决于产品这边，产品让你用什么，你就要用什么，而做为开发人员，我们要做的就是＂整理近可能多的架构方式＂，这样才可以自由的应变．
对于表单验证，我今天看了新浪的邮箱注册，觉得效果还可以，所以，就写了一个，它利用了knockoutjs里的hasfocus属性，对文本框进行焦点捕捉来实现的．
说明：表单元素为焦点时，自动提示要输入的信息，当元素失去焦点时，提示用户输出的正确性，这个功能使用了hasfocus属性，下面看一下代码
ＨＴＭＬ代码
<div class="editor-label"> 账号： </div> <div class="editor-field"> <input data-bind=‘value: name,validationElement:name,hasfocus:selName‘ /> <span class="validationWarn" data-bind="visible:selName">请输入用户名账号，它由字母汉字数字组成．</span> <span data-bind="visible:!selName()"><span class="validationError" data-bind="validationMessage:name"></span></span> <span data-bind="visible:!selName()"><span class="validationSuccess" data-bind="visible:name.isValid()"></span></span> </div> <div class="editor-label"> Email： </div> <div class="editor-field"> <input data-bind=‘value: Email,hasfocus:selEmail‘ /> <span data-bind="visible:!selEmail()"><span class="validationError" data-bind="validationMessage:Email"></span></span> <span class="validationWarn" data-bind="visible:selEmail">请输入你的Email．</span> <span data-bind="visible:!selEmail()"><span class="validationSuccess" data-bind="visible:Email.isValid()"></span></span> </div> <div class="editor-label"> 手机： </div> <div class="editor-field"> <input data-bind=‘value: phone,hasfocus:selPhone‘ /> <span data-bind="visible:!selPhone()"><span class="validationError" data-bind="validationMessage:phone"></span></span> <span class="validationWarn" data-bind="visible:selPhone">请输入你的电话．</span> <span data-bind="visible:!selPhone()"><span class="validationSuccess" data-bind="visible:phone.isValid()"></span></span> </div> <div style="clear: both;"></div> <p> <input type="button" value="Create" data-bind="click:Register" /> </p>
ＪＳ代码
var Product = function () { var self = this; ko.validation.configure({//ko.validation相关配置 insertMessages: false,//不自动插入错误消息 errorElementClass: ‘errorElementClass‘,/*元素的ＣＳＳ样式*/ errorMessageClass: ‘errorMessageClass‘,/*提示信息ＣＳＳ的样式*/ }); self.name = ko.observable().extend({ minLength: 2, maxLength: { params: 30, message: "名称最大长度为30个字符" }, required: { params: true, message: "请输入名称", } }); self.selName = ko.observable(false); self.phone = ko.observable().extend({ required: true, number: { params: true, message: "电话不合法", } }); self.selPhone = ko.observable(false); self.Email = ko.observable().extend({ required: { params: true, message: "请填写Email" }, email: { params: true, message: "Email格式不正确" } }); self.selEmail = ko.observable(false); self.Register = function () { self.errors = ko.validation.group(self); if (self.isValid()) { alert("验证成功，数据可以提交"); } else { self.errors.showAllMessages(); } }; }; product = new Product(); ko.applyBindings(product);
页面截图
MVVM架构~knockoutjs系列之验证信息自定义输出~再续,布布扣,bubuko.com
MVVM架构~knockoutjs系列之验证信息自定义输出~再续
原文：http://www.cnblogs.com/lori/p/3678224.html