What is the best way to display service data as soon as it is received using $http, without relying on angular.copy?

Question

What is the best way to display service data as soon as it is received using $http, without relying on angular.copy?

My challenge is with a service that is supposed to store specific data loaded from a JSON file and display it on the webpage immediately upon receiving. I attempted to set a $scope variable equal to the data in the service, but the data did not show up right away.

I found success only when using:

angular.copy(response.data, this.animals)

, however, I am puzzled as to why it doesn't work when I use: this.animals = response.data. I am curious to understand why this discrepancy exists.

module.service("animalService", function($http) {
    this.animals=[];
    $http.get('animals.json').then(function(response) {
        //this.animals = response.data ----> not working
        angular.copy(response.data, this.animals)
    });
});

module.controller("animalController", function($scope, animalService) {
    //$scope.animals is used to populate an HTML table
    $scope.animals = animalService.aniamsl;
});

javascript angularjs promise

Answer 1

Answer №1

You're on the wrong track, try this instead:

module.service("animalService", function($http) {
     return $http.get('animals.json')
});

module.controller("animalController", function($scope, animalService) {
    animalService.then(function(res){
       $scope.animals = res.data
    });
});

Any http response returns a promise, meaning the data will come asynchronously. Instead of using angular.copy, it's better to handle the promise as demonstrated in the code above.

Update:

Since the variable is populated as a promise and needs to be accessed by other controllers, I recommend using events like $rootScope.emit and $rootScope.on to notify the controllers about the value change once the $http request is complete.

Answer 2

You're on the wrong track, try this instead:

module.service("animalService", function($http) {
     return $http.get('animals.json')
});

module.controller("animalController", function($scope, animalService) {
    animalService.then(function(res){
       $scope.animals = res.data
    });
});

Any http response returns a promise, meaning the data will come asynchronously. Instead of using angular.copy, it's better to handle the promise as demonstrated in the code above.

Update:

Since the variable is populated as a promise and needs to be accessed by other controllers, I recommend using events like $rootScope.emit and $rootScope.on to notify the controllers about the value change once the $http request is complete.

What is the best way to display service data as soon as it is received using $http, without relying on angular.copy?

Answer №1

Update:

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