AngularJS表單

AngularJS提供豐富填寫表單和驗證。我們可以用ng-click來處理AngularJS點擊按鈕事件，然後使用 $dirty 和 $invalid標誌做驗證的方式。使用novalidate表單聲明禁止任何瀏覽器特定的驗證。表單控件使用了大量的角活動。讓我們快速瀏覽一下有關事件先。

事件

AngularJS提供可與HTML控件相關聯的多個事件。例如ng-click通常與按鈕相關聯。以下是AngularJS支持的事件。

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

ng-click

使用點擊一個按鈕的指令，表單重置數據。

<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@gitbook.net";
  }   
   $scope.reset();
}
</script>

驗證數據

可使用下麵跟蹤誤差。

$dirty - 規定值已被改變。
$invalid- 該值的狀態是無效的。
$error- 指出確切的錯誤。

例子

下麵的例子將展示上述所有指令。

testAngularJS.html

<html>
<head>
<title>Angular JS Forms</title>
<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="" 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>
function studentController($scope) { 
   $scope.reset = function(){
		$scope.firstName = "Mahesh";
		$scope.lastName = "Parashar";
		$scope.email = "MaheshParashar@gitbook.net";
   }   
   $scope.reset();
}
</script>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script>
</body>
</html>

輸出

在Web瀏覽器打開textAngularJS.html。看到結果如下。