I am working with a controller named MoviesListsCtrl that is being applied using the ng-controller directive to 3 elements in my HTML document.
When I include the $http service within the controller, it ends up making 3 separate executions for the exact same data.
What would be the most effective approach to fetching JSON data via AJAX just once and then utilizing it across the entire controller?
In the case of a GET request, you have the option to cache the response which will result in only one call being made initially. Subsequent calls will then retrieve data from the cache.
$http({
url: "someUrl",
cache: true
}).success(function(){
// perform some action
}).error(function(){
// perform a different action
});
Even though your code may still be executed multiple times due to its presence on each element, it will only trigger a single HTTP call.
To simplify your code, consider using an Angular service or factory to abstract the $http call. By creating a service, you can ensure that your controllers consistently use the same interface.
Here is an example:
angular.module('myModule')
.service('myService', function ($http, $q) {
var myData = null;
this.get = function (params) {
return myData
? $q.when(myData)
: $http.get('http://example.com/myEndpoint', params)
.success(function (data) {
myData = data;
});
};
});
While this is basic, it captures the main concept. It is advisable to retain a reference to your promise and return it to the caller to prevent redundant HTTP requests if multiple requests are made before the initial request resolves.
By injecting the service into your controller, you can easily retrieve the necessary data. The benefit of this approach is the consistency in calling the method to fetch data. Best of luck with implementing this solution!
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