I am using $q in a geolocation service method, farther below.
The method makes promises to many dependents, leading to multiple calls,
when, depending on the circumstances, only one might suffice. I naively
added a clause ('THIS IS WHAT I WANT TO WORK') that would resolve any
request with the last-found location, but that doesn't have the effect I
hoped -- to block while the method is doing http and resolve when it is not.
What is the usual 'pattern' in angular for managing some async process like
this in a central service, so that whenever the service is asked, it can
decide whether or not to answer with a stored variable or a fresh http call?
function getLocation(){
return $q(function(resolve, reject) {
if (lastLocationFound !== undefined && <OTHER CONDITION(S)>) { //
THIS IS WHAT I WANT TO WORK
resolve(lastLocationFound);
}
$http.get("https://api.ipify.org";).success(function(data){ //
OBTAIN IP
var url = "https://freegeoip.net/json/"; + data +
"?callback=JSON_CALLBACK";
$http.jsonp(url).
success(function(data) {
var lat = parseFloat(data.latitude);
var long = parseFloat(data.longitude);
lastLocationFound = {lat: lat, long: long};
resolve({lat: lat, long: long});
}).error(function(resp, code){
// HANDLE
});
});
});
}
Thanks,
G
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