I have a Javascript function that uses the google API. I want this function to either return the status if there is an error or return the place object if request was OK.
My attempt isn't right because I am specifying the return value inside the anonymous method. I am not sure how to pass up this return value. This is my attempt:
function GetDetail(id)
{
var service = new google.maps.places.PlacesService($('#results').get(0));
service.getDetails({
placeId: id
}, function (place, status) {
if (status === google.maps.places.PlacesServiceStatus.OK) {
return place;
}
else {
return status;
}
});
}
var myReturnObj = GetDetail(1234);
If I declare return value at top of function I still can't return it as the anonymous function does not return instantly so the GetDetail() method returns before it is set. Same with var return = service.getDetails()
I am not sure on the proper way to write this. I have tried various different things but I am confusing myself now.
How do I get GetDetail() to return the place/status object?
Thanks for your help
You need to use callbacks or promises since you can't return from an async call (this is async nature in JS) - here's how you'd use a callback:
function GetDetail(id, callback) {
var service = new google.maps.places.PlacesService($('#results').get(0));
service.getDetails({placeId: id}, function (place, status) {
if (status === google.maps.places.PlacesServiceStatus.OK) {
callback(place);
} else {
callback(status);
}
});
}
GetDetail(1234, function(resp) {
var myReturnObj = resp; //do your work in here!
});
This is why Promises are awesome. AND ES6, ES7, and the new version of Node.js are going to rely on them heavily.
You can say:
GetDetail(1234).then(function(info){
var myInf0 = info;
//then do what you want with it...
res.render('page', {info: myInfo})
}
or:
GetDetail(1234)
.then(function(info){
return db.insert({_id: info.id, stuff: info.arrayOfStuff})
.then(function(){
return db.findOne({_id: info.id})
.then(function(){
res.render('page', {id: info.id})
})
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