AngularJS表單詳解及示例代碼

2019-11-20 09:13:31

字體：大中小

供稿：網(wǎng)友

AngularJS提供豐富填寫表單和驗(yàn)證。我們可以用ng-click來處理AngularJS點(diǎn)擊按鈕事件，然后使用 $dirty 和 $invalid標(biāo)志做驗(yàn)證的方式。使用novalidate表單聲明禁止任何瀏覽器特定的驗(yàn)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(guān)事件先。

事件

AngularJS提供可與HTML控件相關(guān)聯(lián)的多個事件。例如ng-click通常與按鈕相關(guān)聯(lián)。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(diǎn)擊一個按鈕的指令，表單重置數(shù)據(jù)。

<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@yiibai.com"; }    $scope.reset();}</script>

驗(yàn)證數(shù)據(jù)

可使用下面跟蹤誤差。

$dirty - 規(guī)定值已被改變。

$invalid- 該值的狀態(tài)是無效的。

$error- 指出確切的錯誤。

例子

下面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@yiibai.com";  }    $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(jié)果如下。