javascript - Angular ng-show 如何使可见

Question

处理一个简单的联系表单，如果 $scope 未定义，我需要在其中显示错误消息。

验证部分有效，但是我不记得如何在 html 端的 ng-show 下启用消息视图。

HTML：

<p class="response error" ng-show="error">{{errorMessage}}</p>

JS：

var $emptyContent = 'Please enter your prices.';
app.controller('priceForm', ['$scope', '$http', function($scope, $http){
$scope.formData;
// Process the form data
$scope.submitForm = function () {
  console.log($scope.formData);
  if($scope.formData == null) {
    // Show empty content message

    console.log($emptyContent);
  }

}
}])

Answer 1

只需在您的控制器内部制作一个error标志，或者您可以像@ryanyuyu 在评论中建议的那样。trueng-show="errorMessage"

代码

$scope.submitForm = function () {
  console.log($scope.formData);
  if($scope.formData == null) {
    $scope.error = true; //or //$scope.errorMessage = $emptyContent;
  }
};

Answer 2

您不想创建使用预定义对象来解决此问题的自定义错误范围

<form name="myForm">
  <label>
    Enter your name:
    <input type="text"
           name="myName"
           ng-model="name"
           ng-minlength="5"
           ng-maxlength="20"
           required />
  </label>
  <pre>myForm.myName.$error = {{ myForm.myName.$error | json }}</pre>

  <div ng-messages="myForm.myName.$error" style="color:maroon" role="alert">
    <div ng-message="required">You did not enter a field</div>
    <div ng-message="minlength">Your field is too short</div>
    <div ng-message="maxlength">Your field is too long</div>
  </div>
</form>

https://docs.angularjs.org/api/ngMessages/directive/ngMessages