Teach you how to use the AngularJS framework to achieve control verification effects with one line of JS code

Teach you how to use the AngularJS framework to achieve control verification effects with one line of JS code_AngularJS

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Release： 2016-05-16 16:43:37

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As shown in the picture above, we need to implement the following verification functions:

Controls are all must-lose controls
Both need to control the maximum length
When opening the page for the first time, the control cannot be displayed in an error state
After the input content is cleared, the required input control needs to be displayed in an error state
Only when all inputs are legal can the publish button become available
Through AngularJS, we can easily implement these requirements with only 1 line of JS code. The UI style used here is Bootstrap. Let’s start with the sample code:

HTML.

<!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>

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JS code (really only one line)

ContractCreateController.js

var ftitAppModule = angular.module('ftitApp', []);

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That’s it. Let’s explain a few key points:

ng-class: This tag is used to control the value of class. For example, ng-class="{'has-success' : !createContactForm.Content.$pristine} means that if the value of !createContactForm.Content.$pristine is true, the value of class is has-success.
ng-show: Controls whether to display the control.
createContactForm.$valid: After all verifications are passed, the value is true, otherwise it is false
createContactForm.Content.$valid: Identifies whether the Content control passes verification, if passed it is true, otherwise it is false
createContactForm.Content.$pristine: identifies whether the Content control has never been entered. True if never entered, false otherwise
For more detailed technical issues, please check the AngularJS technical documentation.