I'm building an ionic project where users can play a tour (which the data is from an API)
Every tour has an amount of parts that users can play at a certain point on the map. This app must be able to be a 100% offline app, so when the user enters the code of a tour, the data must be retrieved from the API before the user can proceed (so the app will put all the data of the tour offline). Every part has an image, video, audio which is getting downloaded at start of the app.
The problem is that the function call, who is downloading all the data, is not synchronous. The console.log's are saying that the function already ends before all data is downloaded. Pieces of code below:
function getAndFillFullTour() {
vm.showLoader = true;
// load data
TourFactory.getFullTour(vm.tourData.number, function(data){
if(data.state == 'success'){
vm.tourData = data;
var test = downloadData(function(){
// hide loader and continue tour
});
} else {
console.log('error');
}
});
}
This function calls the factory who is getting the full tour including paths of images of each part which is needed to get downloaded on the users device. The downloadData function is the following function:
function downloadData(callback) {
angular.forEach(vm.tourData.parts, function(value, key){
var part = value;
var i = key;
if(part.image !== "") {
TourFactory.getPartImage(part, tourId, function(data){
vm.tourData.parts[i].partImage = data;
console.log('executed with picture ' + i);
});
}
});
if(callback)
callback();
}
Unfortunately, the forloop itself is performing synchronous but it is not waiting for the factory call to complete. I tried a lot of alternatives with promises, but without luck. Could anyone help? I need to wait for the http call to be finished in order to get a response from the downloadData call.
the getPartImage() is just an example, there are five functions like this each for loop which need to be completed first before I get a response in the downloadData call.