AngularJS丰富了表单填写和验证。我们可以使用ngclick事件来处理click按钮,并使用$dirty和$invalid标志无缝地进行验证。使用带有表单声明的novalidate可禁用任何特定于浏览器的验证。表单控件大量使用AngularJS事件。让我们先看看这些事件。
AngularJS提供了与HTML控件关联的多个事件。例如,ng-click指令通常与按钮关联。AngularJS支持以下事件-
ng-click
ng-dbl-click
ng-mousedown
ng-mouseup
ng-mouseenter
ng-mouseleave
ng-mousemove
ng-mouseover
ng-keydown
ng-keyup
ng-keypress
ng-change
使用按钮的ng-click指令重置表单数据。
<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@(528045.com)"; } $scope.reset(); } </script>
以下内容可用于跟踪错误。
$dirty
−说明值已更改。
$invalid
−指出输入的值无效。
$error
−说明确切的错误。
以下示例将展示所有上述指令。
<html> <head> <title>Angular JS Forms</title> <script src = "https://cdn.staticfile.org/angular.js/1.3.14/angular.min.js"></script> <style> table, th , td { border: 1px solid grey; border-collapse: collapse; padding: 5px; } table tr:nth-child(odd) { background-color: #f2f2f2; } table tr:nth-child(even) { background-color: #ffffff; } </style> </head> <body> <h2>AngularJS-表单示例</h2> <div ng-app = "mainApp" ng-controller = "studentController"> <form name = "studentForm" novalidate> <table border = "0"> <tr> <td>输入名字:</td> <td><input name = "firstname" type = "text" ng-model = "firstName" required> <span style = "color:red" ng-show = "studentForm.firstname.$dirty && studentForm.firstname.$invalid"> <span ng-show = "studentForm.firstname.$error.required">必须填写名字.</span> </span> </td> </tr> <tr> <td>输入姓氏: </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.$error.required">必须填写姓氏.</span> </span> </td> </tr> <tr> <td>Email: </td><td><input name = "email" type = "email" ng-model = "email" length = "100" required> <span style = "color:red" ng-show = "studentForm.email.$dirty && studentForm.email.$invalid"> <span ng-show = "studentForm.email.$error.required">电子邮件为必填项.</span> <span ng-show = "studentForm.email.$error.email">无效的邮件地址.</span> </span> </td> </tr> <tr> <td> <button ng-click = "reset()">Reset</button> </td> <td> <button ng-disabled = "studentForm.firstname.$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 = "Sea"; $scope.lastName = "Gull"; $scope.email = "Seagull@(528045.com)"; } $scope.reset(); }); </script> </body> </html>测试看看‹/›
输出结果
在网络浏览器中打开文件testAngularJS.htm并查看结果。