What steps should I follow to build a factory in Angular that utilizes http.get and distributes the data to various controllers?

As my angularjs app grows in complexity, I realize the need to split things into multiple controllers. I am looking to create a factory that can fetch data using http.get and share it across different controllers. While I have managed to pass data into controllers in a simple way, I am unsure about implementing the factory that utilizes http.get. Additionally, I want to ensure that http.get is called only once. For a working example, refer to this plunker

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

myApp.factory('Data2', function($http){
  var getDataUrlString = "myhappyurl.com";
  
  return $http.get(getDataUrlString);
})

myApp.factory('Data', function(){
  return {message:"cool data from factory"}
})

myApp.controller('firstController', function($scope, Data){
  $scope.firstData = Data;
})

myApp.controller('secondController', function($scope, Data){
  $scope.secondData = Data;
})

I believe I am on the right track with the 'Data2' factory. The 'Data' factory, which simply returns a string message, works smoothly in the provided example code. I just need assistance in transitioning from a basic string to utilizing http.get.

Answer №1

When utilizing the factory Data2, keep in mind that it returns a promise. Therefore, you must wait for the promise to be resolved/rejected before accessing the response:

 myApp.controller('firstController', function($scope, Data2){

   Data2.then(function(response){
        $scope.firstData = response.data;
   }).catch(function(error){
      //handle error
   });
 });

It is important to note that since factories are singletons and you are returning a promise as the factory instance, the promise will remain the same and the URL will not be continuously called. To avoid this behavior, consider wrapping it inside a function and returning an object from the factory with a key containing the function reference.

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