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AngularJS表单

AngularJS提供丰富填写表单和验证。我们可以用ng-click来处理AngularJS点击按钮事件,然后使用 $dirty 和 $invalid标志做验证的方式。使用novalidate表单声明禁止任何浏览器特定的验证。表单控件使用了大量的角活动。让我们快速浏览一下有关事件先。

事件

AngularJS提供可与HTML控件相关联的多个事件。例如ng-click通常与按钮相关联。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

使用点击一个按钮的指令,表单重置数据。

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

验证数据

可使用下面跟踪误差。

  • $dirty - 规定值已被改变。

  • $invalid- 该值的状态是无效的。

  • $error- 指出确切的错误。

例子

下面的例子将展示上述所有指令。

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>

输出

在Web浏览器打开textAngularJS.html。看到结果如下。