AngularJS 表单
AngularJS 丰富了表单填充和验证。我们可以使用 ng-click 事件来处理点击按钮,并使用 $dirty 和 $invalid 标志以无缝方式进行验证。使用 novalidate 和表单声明来禁用任何特定于浏览器的验证。表单控件大量使用 AngularJS 事件。让我们先来看看事件。
Events
AngularJS 提供了与 HTML 控件相关的多个事件。例如,ng-click 指令通常与按钮相关联。 AngularJS 支持以下事件:
- ng-click
- ng-dbl-点击
- ng-mousedown
- ng-mouseup
- ng-mouseenter
- ng-mouseleave
- ng-鼠标移动
- ng-鼠标悬停
- ng-keydown
- ng-keyup
- ng-keypress
- ng-改变
ng-click
使用按钮的单击指令重置表单的数据。
<input name = "firstname" type = "text" ng-model = "firstName" required> <input name = "lastname" type = "text" ng-model = "lastName" required> <input name = "email" type = "email" ng-model = "email" required> <button ng-click = "reset()">Reset</button> <script> function studentController($scope) { $scope.reset = function() { $scope.firstName = "Mahesh"; $scope.lastName = "Parashar"; $scope.email = "MaheshParashar@newbiego.com"; } $scope.reset(); } </script>
验证数据
以下可用于跟踪错误。
-
$dirty : 表示值已更改。
-
$invalid :表示输入的值无效。
-
$error : 说明准确的错误。
例子
以下示例将展示所有上述指令。
测试AngularJS.htm
<html> <head> <title>Angular JS Forms</title> <script src = "https:// ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"> <style> table, th , td { border: 1px solid grey; border-collapse: collapse; padding: 5px; } table tr:nth-child(odd) { background-color: #f2f2f2; } table tr:nth-child(even) { background-color: #ffffff; } </style> </head> <body> <h2>AngularJS Sample Application</h2> <div ng-app = "mainApp" ng-controller = "studentController"> <form name = "studentForm" novalidate> <table border = "0"> <tr> <td>Enter first name:</td> <td><input name = "firstname" type = "text" ng-model = "firstName" required> <span style = "color:red" ng-show = "studentForm.firstname.$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 = "Mahesh"; $scope.lastName = "Parashar"; $scope.email = "MaheshParashar@newbiego.com"; } $scope.reset(); }); </script> </body> </html>
输出
打开文件 测试AngularJS.htm 在网络浏览器中查看结果。