Utilizing API data sharing across AngularJS controllers

Question

Utilizing API data sharing across AngularJS controllers

I am facing a challenge with my parent controller and its children controllers, as I want them all to share the data fetched from an Api service.

Controllers:

var app = angular.module('mymodule',[]);

app.controller('main', ['$scope', 'Api', function($scope, Api) {
    var getList1 = Api.getList1()
      .then(function(resp) {
        $scope.list1 = resp.data;
      });

    var getList2 = Api.getList2()
      .then(function(resp) {
        $scope.list2 = resp.data;
      });
}]);

app.controller('child1', ['$scope', function($scope) {
    $scope.list1 = ?
    $scope.list2 = ?
}]);

app.controller('child2', ['$scope', function($scope) {
    $scope.list1 = ?
}]);

View:

<div ng-controller="main">
    <ul>
        <li ng-repeat="list in list1">
            {{list.item}}
        </li>
    </ul>
    <div ng-controller="child1">
        <ul>
            <li ng-repeat="list in list1">
                {{list.item}}
            </li>
        </ul>
        <ul>
            <li ng-repeat="list in list2">
                {{list.item}}
            </li>
        </ul>
    </div>
    <div ng-controller="child1">
        <ul>
            <li ng-repeat="list in list1">
                {{list.item}}
            </li>
        </ul>
    </div>
</div>

I attempted to implement this solution using Angular's events mechanism ($on, $emit).
I encountered difficulty in determining which child controller is active and passing the data once the promise is resolved. This led to messy spaghetti code...

javascript angularjs

Answer 1

Answer №1

If you're looking for the optimal method, consider utilizing a service to manage your API operations within your application. Take a look at this fiddle for insights on how to achieve your desired functionality. By leveraging AngularJS services, you can seamlessly share data, objects, and functions across controllers, fostering seamless interaction regardless of the number of controllers in your app.

The example below showcases a comprehensive API service integrated with actual HTTP requests and an AngularJS service handler. Incorporate this logic into your application for effective implementation. Be sure to explore the demo in the fiddle demo.

View

<div ng-controller="MyCtrl">
   <h1>
    MyCtrl
   </h1>
   <button ng-click="clearData()">
    Clear data by using MyCtrl
   </button>
   <div ng-repeat="user in users">
     <p>
       Username: {{ user.name }}
     </p>
   </div>
</div>
<br /><br />
<div ng-controller="MyOtherCtrl">
 <h1>
  MyOtherController
 </h1>
   <button ng-click="clearData()">
    Clear data by using MyOtherController
   </button>
   <div ng-repeat="user in users">
     <p>
       Username: {{ user.name }}
     </p>
   </div>
</div>

AngularJS Application

var myApp = angular.module('myApp',[]);;


myApp.controller('MyCtrl', function ($scope, apiService) {
   $scope.users = apiService.getResponseData();
   $scope.$watch(function () { return apiService.getResponseData()}, function (newValue, oldValue) {
     $scope.users = newValue
   });

   $scope.clearData = function () {
        apiService.reset();
   }
});
myApp.controller('MyOtherCtrl', function ($scope, apiService) {

   apiService.loadData();

   $scope.$watch(function () { return apiService.getResponseData()}, function (newValue, oldValue) {
     $scope.users = newValue
   });

   $scope.clearData = function () {
        apiService.reset();
   }
})


myApp.service('apiService', function ($http) {

  var responseData = null;

  return {
    loadData: function () {
      return $http({
         url: 'https://jsonplaceholder.typicode.com/users',
         method: 'GET'
      }).then(function (response) {
         responseData = response.data
      });
    },
    getResponseData: function () {
       return responseData
    },
    reset: function () {
       responseData = null;
    }
  }
});

Answer 2

If you're looking for the optimal method, consider utilizing a service to manage your API operations within your application. Take a look at this fiddle for insights on how to achieve your desired functionality. By leveraging AngularJS services, you can seamlessly share data, objects, and functions across controllers, fostering seamless interaction regardless of the number of controllers in your app.

The example below showcases a comprehensive API service integrated with actual HTTP requests and an AngularJS service handler. Incorporate this logic into your application for effective implementation. Be sure to explore the demo in the fiddle demo.

View

<div ng-controller="MyCtrl">
   <h1>
    MyCtrl
   </h1>
   <button ng-click="clearData()">
    Clear data by using MyCtrl
   </button>
   <div ng-repeat="user in users">
     <p>
       Username: {{ user.name }}
     </p>
   </div>
</div>
<br /><br />
<div ng-controller="MyOtherCtrl">
 <h1>
  MyOtherController
 </h1>
   <button ng-click="clearData()">
    Clear data by using MyOtherController
   </button>
   <div ng-repeat="user in users">
     <p>
       Username: {{ user.name }}
     </p>
   </div>
</div>

AngularJS Application

var myApp = angular.module('myApp',[]);;


myApp.controller('MyCtrl', function ($scope, apiService) {
   $scope.users = apiService.getResponseData();
   $scope.$watch(function () { return apiService.getResponseData()}, function (newValue, oldValue) {
     $scope.users = newValue
   });

   $scope.clearData = function () {
        apiService.reset();
   }
});
myApp.controller('MyOtherCtrl', function ($scope, apiService) {

   apiService.loadData();

   $scope.$watch(function () { return apiService.getResponseData()}, function (newValue, oldValue) {
     $scope.users = newValue
   });

   $scope.clearData = function () {
        apiService.reset();
   }
})


myApp.service('apiService', function ($http) {

  var responseData = null;

  return {
    loadData: function () {
      return $http({
         url: 'https://jsonplaceholder.typicode.com/users',
         method: 'GET'
      }).then(function (response) {
         responseData = response.data
      });
    },
    getResponseData: function () {
       return responseData
    },
    reset: function () {
       responseData = null;
    }
  }
});

Answer 3

Answer №2

When your data resides within the parent controller, you have the ability to retrieve it in child controllers using the $scope.$parent method:

app.controller('child2', ['$scope', function($scope) {
    $scope.data1 = $scope.$parent.data1;
    $scope.data2 = $scope.$parent.data2;
}]);

Answer 4

When your data resides within the parent controller, you have the ability to retrieve it in child controllers using the $scope.$parent method:

app.controller('child2', ['$scope', function($scope) {
    $scope.data1 = $scope.$parent.data1;
    $scope.data2 = $scope.$parent.data2;
}]);

Answer 5

Answer №3

Create directives for your children, allowing you to inject data into the scope.

yourModule.directive('child2', function() {
    return {
       scope: {items:'=',
       controller: function (scope) {
           //consider adding a controller for extra functionality
           scope.doSomething =  function() {
              //access items from the scope here
           }
       },
       template: '<ul><li ng-repeat="item in items">{{item.name}}<li><ul>'
    }
}

Usage:

<child2 items="items"></child2>

Answer 6

Create directives for your children, allowing you to inject data into the scope.

yourModule.directive('child2', function() {
    return {
       scope: {items:'=',
       controller: function (scope) {
           //consider adding a controller for extra functionality
           scope.doSomething =  function() {
              //access items from the scope here
           }
       },
       template: '<ul><li ng-repeat="item in items">{{item.name}}<li><ul>'
    }
}

Usage:

<child2 items="items"></child2>

Utilizing API data sharing across AngularJS controllers

Controllers:

View:

Answer №1

View

AngularJS Application

Answer №2

Answer №3

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