在 Angularjs 中提交表单时显示验证消息

Question

我想在用户点击提交表单后显示验证消息。 例如，文本框是必需的，用户直接点击提交按钮，然后应该显示验证字段。

当用户点击表单时，没有任何反应。

<body ng-controller="AppController as ctrl">

<form ng-submit="ctrl.submit()" name="myForm" novalidate>
    <input type="text" ng-model="ctrl.user.username" name="uname" class="username" placeholder="Enter your name" required ng-minlength="3" />
    <span ng-show="myForm.$dirty && myForm.uname.$error.required">This is a required field</span>

    <input type="text" ng-model="ctrl.user.address" placeholder="Enter your Address" /><br /><br />

    <input type="email" ng-model="ctrl.user.email" name="email" class="email" placeholder="Enter your Email" required />
    <span ng-show="myForm.$dirty && myForm.email.$error.required">This is a required field</span>

    <input type="submit" value="Submit">
</form>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.4/angular.js">
</script>
<script>
    angular.module('myApp', [])
    .controller('AppController', [function () {
        var self = this;
        self.submit = function () {
            console.log('Form is submitted with following user', self.user);
        };
    }]);
</script>

Answer 1

当 Angular 提交表单时，它会将表单级别的 $submitted 属性设置为 true，同时在 form 的类属性上添加 ng-submitted 类。

您可以使用myForm.$submitted 等表单对象的$submitted 属性来识别该表单是否已提交

ng-show="myForm.$submitted && myForm.uname.$error.required"

Demo Plunker