Javascript AngularJS表单验证中的ng类
以下关于angularJS表单验证的代码让我感到困惑。请参阅下面的HTML表单和JavaScript代码,这是我们的讲师给出的示例代码。我不明白的是这个标签Javascript AngularJS表单验证中的ng类,javascript,angularjs,forms,Javascript,Angularjs,Forms,以下关于angularJS表单验证的代码让我感到困惑。请参阅下面的HTML表单和JavaScript代码,这是我们的讲师给出的示例代码。我不明白的是这个标签 <div class="form-group" ng-class="{ 'has-error': feedbackForm.firstName.$error.required && !feedbackForm.firstName.$pristine }"> 可以使用“feedbackFrom.first
<div class="form-group" ng-class="{ 'has-error': feedbackForm.firstName.$error.required && !feedbackForm.firstName.$pristine }">
可以使用“feedbackFrom.firstName”访问它,因为您已经使用“feedbackFrom”命名了表单,并且输入的name属性的值为“firstName”
至于表单对象及其$error和$pristine,您可以在这里的文档中找到它:您有点不对劲
feedbackForm.firstName
引用表单feedbackForm
和输入字段firstName
ngModel引用$scope.feedback
对象并处理模型绑定
$error
和$pristine
是AngularJS添加的类,用于指示输入字段的状态。当您使用angular创建表单时,表单中的每个元素的引用都会在表单对象中创建
$error和$pristine由angular创建,表示表单字段的状态。如果firstName.$error=true,则firstName字段中输入的值不符合验证要求(例如长度)$pristine告诉angular是否触摸过形状。这可以防止在用户尚未输入任何信息时字段显示为无效
tl;博士:
$scope.feedback.firstName直接引用输入字段,而$scope.feedbackForm.firstName引用与表单相关的输入字段
<div ng-controller="FeedbackController">
<form role="form" name="feedbackForm" ng-submit="sendFeedback()" novalidate>
<div class="form-group" ng-class="{ 'has-error': feedbackForm.firstName.$error.required &&!feedbackForm.firstName.$pristine }">
<label for="firstname" class="col-sm-2 control-label">First Name</label>
<div class="col-sm-10">
<input type="text" class="form-control" id="firstname" name="firstname" placeholder="Enter First Name" ng model="feedback.firstName" required>
<span ng-show="feedbackForm.firstName.$error.required && !feedbackForm.firstName.$pristine" class="help-block">Your first name is required.</span>
</div>
</div>
</form>
.controller('ContactController', ['$scope', function($scope) {
$scope.feedback = {mychannel:"", firstName:"", lastName:"", agree:false, email:"" };
var channels = [{value:"tel", label:"Tel."}, {value:"Email",label:"Email"}];
$scope.channels = channels;
$scope.invalidChannelSelection = false;
}])
.controller('FeedbackController', ['$scope', function($scope) {
$scope.sendFeedback = function() {
console.log($scope.feedback);
if ($scope.feedback.agree && ($scope.feedback.mychannel == "")) {
$scope.invalidChannelSelection = true;
console.log('incorrect');
}
else {
$scope.invalidChannelSelection = false;
$scope.feedback = {mychannel:"", firstName:"", lastName:"", agree:false, email:"" };
$scope.feedback.mychannel="";
$scope.feedbackForm.$setPristine();
console.log($scope.feedback);
}
};
}])