Executing AngularJS code that returns a promise within an event

Question

Executing AngularJS code that returns a promise within an event

In my run function, I am handling the $routeChangeSuccess event. My goal is to use $http to load some data and then change the $template. The issue here is that $http works asynchronously. I have attempted to return a promise inside the event, but it has not been successful. Should I resort to using jQuery directly instead of $http to load my resource?

app.run(["$rootScope", "$http", "$location", "$q", "localize", function($rootScope, $http, $location, $q) {
    $rootScope.$on("$routeChangeSuccess", function(event, current, previous) {
        var promise = $q.defer();
        //load something and resolve promise when everything is ready
        return promise;
    });
}
]);

javascript angularjs

Answer 1

Answer №1

The $q.defer function does not directly give back a promise. It actually gives a deferred object instead. To obtain the promise, you must return deferred.promise.

Here is how you can modify your code:

var deferred = $q.defer();
// Perform some actions and resolve the promise when ready
// Use deferred.resolve('bar') to resolve it
return deferred.promise;

For more information, refer to the documentation at http://docs.angularjs.org/api/ng.$q

Answer 2

The $q.defer function does not directly give back a promise. It actually gives a deferred object instead. To obtain the promise, you must return deferred.promise.

Here is how you can modify your code:

var deferred = $q.defer();
// Perform some actions and resolve the promise when ready
// Use deferred.resolve('bar') to resolve it
return deferred.promise;

For more information, refer to the documentation at http://docs.angularjs.org/api/ng.$q

Answer 3

Answer №2

$rootScope.$on("$routeChangeSuccess", function(event, current, previous) {
    fetch(some_url)
        .then(response => response.json())
        .then(data => {
            // manipulate the data here
            return modifiedData;
        })
        .catch(error => {
            // handle error scenario, maybe using $emit?
            return handleError;
        });
});

Answer 4

$rootScope.$on("$routeChangeSuccess", function(event, current, previous) {
    fetch(some_url)
        .then(response => response.json())
        .then(data => {
            // manipulate the data here
            return modifiedData;
        })
        .catch(error => {
            // handle error scenario, maybe using $emit?
            return handleError;
        });
});

Executing AngularJS code that returns a promise within an event

Answer №1

Answer №2

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