AngularJS: Using Shared Service(with $resource) to share data between controllers, but how to define callback functions?
- by shaunlim
Note: I also posted this question on the AngularJS mailing list here: https://groups.google.com/forum/#!topic/angular/UC8_pZsdn2U
Hi All,
I'm building my first AngularJS app and am not very familiar with Javascript to begin with so any guidance will be much appreciated :)
My App has two controllers, ClientController and CountryController. In CountryController, I'm retrieving a list of countries from a CountryService that uses the $resource object. This works fine, but I want to be able to share the list of countries with the ClientController. After some research, I read that I should use the CountryService to store the data and inject that service into both controllers.
This was the code I had before:
CountryService:
services.factory('CountryService', function($resource) {
return $resource('http://localhost:port/restwrapper/client.json', {port: ':8080'});
});
CountryController:
//Get list of countries
//inherently async query using deferred promise
$scope.countries = CountryService.query(function(result){
//preselected first entry as default
$scope.selected.country = $scope.countries[0];
});
And after my changes, they look like this:
CountryService:
services.factory('CountryService', function($resource) {
var countryService = {};
var data;
var resource = $resource('http://localhost:port/restwrapper/country.json', {port: ':8080'});
var countries = function() {
data = resource.query();
return data;
}
return {
getCountries: function() {
if(data) {
console.log("returning cached data");
return data;
} else {
console.log("getting countries from server");
return countries();
}
}
};
});
CountryController:
$scope.countries = CountryService.getCountries(function(result){
console.log("i need a callback function here...");
});
The problem is that I used to be able to use the callback function in $resource.query() to preselect a default selection, but now that I've moved the query() call to within my CountryService, I seemed to have lost what.
What's the best way to go about solving this problem?
Thanks for your help,
Shaun
