Create promise in AngularJS

Question

I\'m trying to create a promise in Angular with the $q service. It returns an object retrieved from a web service. If the object is in the cache, it returns it without calling t

Answer 1

You don't need to wrap it into one more promise since ServerRequest.getNavigationMap() is a promise:

function returnMapAsync() {

    if (navigationMap) {
        return $q.resolve(navigationMap);
    } 

    return ServerRequest.getNavigationMap().then(function(data) {
        navigationMap = data.object;
        return navigationMap;
    });
}

Answer 2

You shouldn't need to wrap everything in the $q() call. In order to promisify navigationMap use $q.when:

function returnMapAsync() {

    if (navigationMap) {
        return $q.when(navigationMap);
    }
    return ServerRequest.getNavigationMap();
}