如上图所示，我们需要实现如下这些验证功能：
控件都是必输控件
都需要控制最大长度
第一次打开页面，控件不能显示为错误状态
输入内容再清空后，必输控件需要显示为错误状态
只有所有输入合法后，发布按钮才能变为可用状态
通过AngularJS，我们可以很轻松的实现这些要求，只需要1行JS代码。UI样式这里采用的是Bootstrap。先上示例代码：
HTML。
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<!DOCTYPE html><html lang="zh-cn" ng-app="ftitApp"><head> <meta charset="utf-8" /> <title>Demo</title> <link href="/Content/bootstrap.css" rel="stylesheet"/> <script src="/Scripts/angular.js"></script></head><body> <div class="container body-content"> <!-- 主要内容区域 --> <div class="row main-content"> <div class="col-md-9"> <!-- 联系我们表单区域 --> <form action="/Contact/Create" method="post" role="form" name="createContactForm" ng-controller="ContactCreateController"> <!-- UserName 您的称呼 --> <div class="form-group has-feedback" ng-class="{'has-success' : !createContactForm.UserName.$pristine && createContactForm.UserName.$valid, 'has-error' : !createContactForm.UserName.$pristine && createContactForm.UserName.$invalid }"> <label for="UserName">您的称呼*</label> <input type="text" class="form-control" ng-model="userName" name="UserName" autofocus="" required ng-maxlength=30> <div ng-show="!createContactForm.UserName.$pristine && createContactForm.UserName.$valid"> <span class="glyphicon glyphicon-ok form-control-feedback"></span> </div> <div ng-show="!createContactForm.UserName.$pristine && createContactForm.UserName.$invalid"> <span class="glyphicon glyphicon-remove form-control-feedback"></span> </div> </div> <!-- UserMail 邮箱地址 --> <div class="form-group has-feedback" ng-class="{'has-success' : !createContactForm.UserMail.$pristine && createContactForm.UserMail.$valid, 'has-error' : !createContactForm.UserMail.$pristine && createContactForm.UserMail.$invalid }"> <label for="UserMail">邮箱地址*</label> <input type="email" class="form-control" ng-model="userMail" name="UserMail" required ng-maxlength=30> <div ng-show="!createContactForm.UserMail.$pristine && createContactForm.UserMail.$valid"> <span class="glyphicon glyphicon-ok form-control-feedback"></span> </div> <div ng-show="!createContactForm.UserMail.$pristine && createContactForm.UserMail.$invalid"> <span class="glyphicon glyphicon-remove form-control-feedback"></span> </div> </div> <!-- Subject 主题 --> <div class="form-group has-feedback" ng-class="{'has-success' : !createContactForm.Subject.$pristine && createContactForm.Subject.$valid, 'has-error' : !createContactForm.Subject.$pristine && createContactForm.Subject.$invalid }"> <label for="Subject">主题*</label> <input type="text" class="form-control" ng-model="subject" name="Subject" required ng-maxlength=100> <div ng-show="!createContactForm.Subject.$pristine && createContactForm.Subject.$valid"> <span class="glyphicon glyphicon-ok form-control-feedback"></span> </div> <div ng-show="!createContactForm.Subject.$pristine && createContactForm.Subject.$invalid"> <span class="glyphicon glyphicon-remove form-control-feedback"></span> </div> </div> <!-- Content 内容 --> <div class="form-group has-feedback" ng-class="{'has-success' : !createContactForm.Content.$pristine && createContactForm.Content.$valid, 'has-error' : !createContactForm.Content.$pristine && createContactForm.Content.$invalid }"> <label for="Content">内容*</label> <textarea cols="4" rows="5" class="form-control" ng-model="content" name="Content" required ng-maxlength=1000></textarea> <div ng-show="!createContactForm.Content.$pristine && createContactForm.Content.$valid"> <span class="glyphicon glyphicon-ok form-control-feedback"></span> </div> <div ng-show="!createContactForm.Content.$pristine && createContactForm.Content.$invalid"> <span class="glyphicon glyphicon-remove form-control-feedback"></span> </div> </div> <!-- 提交按钮 --> <div class="form-group"> <div ng-show="createContactForm.$valid"> <input type="image" src="/Content/images/comment_publish_button.png" onsubmit="submit();" value="发布" ng-disabled='!createContactForm.$valid' /> </div> <div ng-show="!createContactForm.$valid"> <img src="/Content/images/invalid_publish_button.png" /> </div> </div> </form> </div> </div> </div> <script src="/Scripts/ftit/ContactCreateController.js"></script></body></html> |
JS代码（真的只有一行哟）
ContractCreateController.js
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var ftitAppModule = angular.module('ftitApp', []); |
这样就好啦。几个关键的地方解释一下：
ng-class：这个标签用来控制class的值。例如ng-class="{'has-success' : !createContactForm.Content.$pristine}的意思就是，如果!createContactForm.Content.$pristine的值为true，class的值就为has-success。
ng-show：控制是否显示该控件。
createContactForm.$valid：全部验证通过后，值为true，否则为false
createContactForm.Content.$valid：标识Content控件是否通过验证，通过为true，否则为false
createContactForm.Content.$pristine：标识Content控件是否从未输入过。从未输入为true，否则为false
更细节的技术问题请查看AngularJS的技术文档。
