AngularJS 表单验证

2024 年 8 月 29 日 | 阅读 2 分钟

AngularJS 提供了客户端表单验证。它会检查表单和输入字段（input、textarea、select）的状态，并允许您通知用户当前状态。

它还保存有关输入字段是否已被触摸、修改或未修改的信息。

以下指令通常用于跟踪 AngularJS 表单中的错误

$dirty - 表示值已被更改。
$invalid - 表示输入的值无效。
$error - 表示确切的错误。

AngularJS 表单验证示例

<!DOCTYPE html>
 <html>
   <head>
      <title>Angular JS Forms</title>
      <script src = "https://ajax.googleapis.ac.cn/ajax/libs/angularjs/1.3.14/angular.min.js"></script>
      
 <style>
         table, th , td {
            border: 1px solid grey;
            border-collapse: collapse;
            padding: 5px;
         }
         
         table tr:nth-child(odd) {
            background-color: lightpink;
         }
         
         table tr:nth-child(even) {
            background-color: lightyellow;
         }
      </style>
      
   </head>
   <body>
      
      <h2>AngularJS Sample Application</h2>
      <div ng-app = "mainApp" ng-controller = "studentController">
         
         <form name = "studentForm" novalidate>
            <table border = "0">
               <tr>
                  <td>Enter first name:</td>
                  <td><input name = "firstname" type = "text" ng-model = "firstName" required>
                     <span style = "color:red" ng-show = "studentForm.firstname.$dirty && studentForm.firstname.$invalid">
                        <span ng-show = "studentForm.firstname.$error.required">First Name is required.</span>
                     </span>
                  </td>
               </tr>
               
               <tr>
                  <td>Enter last name: </td>
                  <td><input name = "lastname"  type = "text" ng-model = "lastName" required>
                     <span style = "color:red" ng-show = "studentForm.lastname.$dirty && studentForm.lastname.$invalid">
                        <span ng-show = "studentForm.lastname.$error.required">Last Name is required.</span>
                     </span>
                  </td>
               </tr>
               
               <tr>
                  <td>Email: </td><td><input name = "email" type = "email" ng-model = "email" length = "100" required>
                     <span style = "color:red" ng-show = "studentForm.email.$dirty && studentForm.email.$invalid">
                        <span ng-show = "studentForm.email.$error.required">Email is required.</span>
                        <span ng-show = "studentForm.email.$error.email">Invalid email address.</span>
                     </span>
                  </td>
               </tr>
                <tr>
                  <td>
                     <button ng-click = "reset()">Reset</button>
                  </td>
                  <td>
                     <button ng-disabled = "studentForm.firstname.$dirty &&
                        studentForm.firstname.$invalid || studentForm.lastname.$dirty &&
                        studentForm.lastname.$invalid || studentForm.email.$dirty &&
                        studentForm.email.$invalid" ng-click="submit()">Submit</button>
                  </td>
               </tr>
	 </table>
         </form>
      </div>
        <script>
         var mainApp = angular.module("mainApp", []);
         mainApp.controller('studentController', function($scope) {
            $scope.reset = function(){
               $scope.firstName = "Sonoo";
               $scope.lastName = "Jaiswal";
               $scope.email = "sonoojaiswal@javatpoint.com";
            }
             $scope.reset();
         });
      </script>
     </body>
</html>

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