Is there a way to ensure that my AngularJS factory fetches HTTP data only once?

I have implemented a factory in my project to share data among multiple controllers. Here is the code for my factory:

    var szGetData = "some url that works";
    myApp.factory('Data', function ($http) {
        var eventData = {};
        eventData.getEvent = function (event) {
                return $http.get(szGetData, event);
            }
        return eventData;
    });

Each of my controllers calls the factory in the same way, like this:

        Data.getEvent()
            .success(function (event) {
                $scope.eventData = event;

            })
            .error(function (error) {
                $scope.status = 'Unable to load customer data: ' + error.message;
            });

Although everything is functioning correctly and I am able to retrieve the data, the web-service is being called three times and each controller has its own copy of the data. I would prefer to have all controllers working with the same data and only make one call to the web-service. Any suggestions on how to achieve this would be greatly appreciated.

Answer №1

One way to manage the pending promise is by storing it and then returning it to all subsequent callers.

Alternatively, in case of a request failure, you can reset the promise so that the next call to getEvent (after a failure) will trigger another attempt.

var szGetData = "a valid URL here";
myApp.factory('Data', function ($http) {
    var eventData = {};
    var promise;
    eventData.getEvent = function (event) {
        if(!promise){
            promise = $http.get(szGetData, event)
                .error(function(){ // this step is not mandatory
                    promise = false;
                });
        }
        return promise;
    }
    return eventData;
});

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