Creating an Angular directive that handles asynchronous attribute interpolation

I am facing an issue with my custom directive. In the link function attributes, I am trying to access the value of attributes.user. Here is how the directive is used in my view page:

<div my-directive user="{{user.name}}"></div>

The user object is fetched from a JSON response after making an HTTP request using the $http service. However, when I debug the attribute.user value in my directive, it returns blank. If I set user.name to a static value like "hello", it works fine. I have also tried:

attributes.$observe('user', function(val){...})

but it did not work either. Could this be related to the asynchronous nature of the request? How can I resolve this issue? Any help would be appreciated!

Edit: Sharing a snippet of my directive code for reference

angular.module('myApp').directive('myDirective', function() {
  return {
    restrict: 'A',
    scope: true,
    link: function($scope, elem, attr) {
      $scope.user = $.parseJSON(attr.user)
    },
    controller: ['$scope', '$rootScope', 'GlobalVariables', function($scope, $rootScope, GlobalVariables) {

    $rootScope.hasSignedUp = GlobalVariables.hasSignedUp;
    $rootScope.signUpId = GlobalVariables.signUpId;

    $rootScope.$watch('hasVoted', function(newVal, oldVal) {
      if(newVal === true) {
        if($rootScope.signUpId == $scope.user.id){
          $scope.text = 'Signed Up!';
        }else{
          $scope.text = 'Sign Up';
        }
      }else{
        $scope.text = 'Sign Up';
      }
     });
    }]
  };
});

Answer №1

Initially, it's important to note that the scope should not be a boolean but rather a dictionary with the expected attribute keys. Modify your scope as follows:

scope: {
    user: '=',
}

Furthermore, when using a directive, ensure that the scope values are variables and do not include angular handlebars. Here is the correct implementation:

<div my-directive user="user"></div>

By following these changes, your code should now function correctly. For more detailed information, refer to AngularJS's official documentation.

Answer №2

UPDATE: Setting up an isolated scope and binding for your directive can be achieved as shown in the example below:

angular.module('myApp').directive('myDirective', function () {
    return {
        restrict: 'A',
        scope: {
            user:'=user'
        },
        link: function (scope, elem, attr) {

           // Utilize link to manage internal logic

           // Perform actions with the scope.user here

            console.log(scope.user);


        },
        controller: ['$scope', '$rootScope', 'GlobalVariables', function ($scope, $rootScope, GlobalVariables) {

            // Use this to expose your directive's functionality


        }]
    };
});

It is important to note that the link function handles internal logic of a directive, while the controller function exports the directive's functionalities.

For further details, please refer to this resource: https://docs.angularjs.org/guide/directive

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