Tips on transferring JSON data to an AngularJS directive

I'm currently in the process of learning AngularJS and I'm attempting to create a reusable component.

However, I've encountered an issue where I can't populate the fields inside the element with data retrieved from JSON. After searching on various platforms, including SO and other websites, I still couldn't find a solution. Can anyone point out what I might be doing wrong?

I have two controllers set up: one retrieves a list of all countries:

app.controller('MainController', ['$scope', 'Countries',
                                  function ($scope, Countries) {
  $scope.countries = Countries.query();
}]);

The other controller collects specific address details:

app.controller('AddressesController', ['$scope', '$routeParams', 'Address',
  function($scope, $routeParams, Address) {

    if ($routeParams.addressId) {
      $scope.senderAddress = Address.get({addressId: $routeParams.addressId});
    } else {
      $scope.senderAddress = {"id":null, "country":null, "city":null, "street":null};
    }

    $scope.adData = {"id": 1, "country": "Poland", "city": "Warsaw", "street": "Nullowska 15"};
  }]);

The services are defined as follows, and they appear to be functioning correctly by providing valid JSON data:

myServices.factory('Countries', ['$resource',
                                function($resource) {
                                  return $resource('data/countries.json', {}, {
                                    query: {method:'GET'}
                                  })
                                }]);
myServices.factory('Address', ['$resource',
                               function($resource) {
                                 return $resource('data/:addressId.json', {}, {
                                   query: {method:'GET', params:{addressId:'addressId'}}
                                 })
                               }])

I have set up routing to direct to the AddressesController:

app.config(function ($routeProvider) {
  $routeProvider
  .when('/address', {
    templateUrl: 'partials/addresses.html',
    controller: 'AddressesController'
  })
  .when('/address/:addressId', {
    templateUrl: 'partials/addresses2.html',
    controller: 'AddressesController'
  })
});

In the partial view, I've created 2 elements:

<label> Sender </label>
<address address-data='{{senderAddress}}'></address>

<label> Receiver </label>
<address></address>

Now the directive is declared in this manner:

app.directive("address", function () {
  return {
    restrict: "E",
    templateUrl: "/directives/address.html",
    scope: {addrData: '@senderAddress'},
    link: function(scope, element, attributes) {
      scope.adData = attributes["addressData"];
    }
  }
});

The template for the directive is as follows:

<div> 

<label> {{senderAddress}} </label>
<div>
    <label>Country</label>
    <select>
        <option value=""></option>
        <option ng-repeat="country in countries.countries" value="{{country}}">{{country}}</option>
    </select>
</div>

<div>
    <label>City {{dto.adData.city}}</label>
    <input type="text" data-ng-model="dto.adData.city"  />
</div>

<div>
    <label>Street {{dto.adData.street}}</label>
    <input type="text" data-ng-model="dto.adData.street">
</div>

</div>

Everything seems to be working fine outside of the directive. However, I believe I may be missing something in terms of handling the scope within a directive when dealing with data fetched from a JSON service. Is it because the JSON data is a promise object when the links to the directive are being created? How should this be managed?

PS

I've also attempted observing the attributes:

link: function(scope, element, attributes) {
      attrs.$observe('addressData', function(data) {
        if (!data)
          return;
        scope.dto.adData = data;
      })
}

Even for statically defined data, it doesn't seem to work as intended:

app.directive("address", function () {
  return {

    controller: function($scope) {
      $scope.dto = {};
      $scope.dto.data = {"id": 1, "country": "Poland", "city": "Warsaw", "street": "Nullowska 15"};
    },

Answer №1

Instead of passing the JSON in this manner, I would recommend utilizing an isolate scope to properly bind the data and ensure two-way binding functionality. By using an isolate scope, you can enhance the directive's efficiency.

To implement this, your directive should be used without handlebars as shown below:

<address address-data='senderAddress'></address>

Furthermore, include a scope option in the directive definition like so:

app.directive("address", function () {
  return {
    restrict: "E",
    templateUrl: "/directives/address.html",
    scope: {
        addressData: '='
    }
  }
});

The use of the equals sign '=' instructs Angular to establish a bi-directional binding between the parent scope variable indicated by the address-data attribute and the child scope variable addressData. This process automatically normalizes the name "address-data" to "addressData" in JavaScript format. If you prefer different names for the scope variables, you can utilize innerAddressData: '=addressData'.

By following this approach, there is no need for a linking function and the binding functionality remains intact.

Answer №2

Great news, I managed to figure it out! If anyone encounters a similar issue, remember to double-check if the scope is set to true and confirm that JSON is being parsed correctly from a string ;-).

app.directive("location", function () {
  return {
    restrict: "E",
    templateUrl: "/directives/location.html",
    scope: true, // ensure its own local scope is created
    link: function(scope, element, attributes) {

      attributes.$observe('locationData', function(data) {
        if (!data)
          return;
        scope.details = {};
        // It's working smoothly, but in the second scenario, data is also populated
        scope.details.locData = angular.fromJson(data);

      })
    }
  }
});

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