How do I access/store latitude and longitude from Ti.Geolocation.getCurrentPosition?

Question

I am using Titanium Studio (3.4.1) and writing in JavaScript for iOS and Android.

I am trying to get the device's latitude and longitude and return it to a function so that I could call on that function in another module and pass it to another function.

This is geo.js and inside I am loading Ti.Geolocation.getCurrentPosition and attempting to return the lattitude to the function getLat(). And then, make it available to app.js with exports.

exports.getLat = function(){
Ti.Geolocation.getCurrentPosition(function(e) {
    console.log(e);
    timeout : 10000;
    return JSON.stringify(e.coords.latitude);
});
};

This is app.js and it checks to see which platform the app is running. It sees its an iPhone and then requires geo.getLat(). After that I want to store the latitude into the variable lat and use it later to feed it to another function as a parameter, like getWdata(lat);

if (Ti.Platform.osname === 'android') {
    console.log('android version\n');
    var geo = require('geo');
    var lat = geo.getLat(0);
    var lng = geo.getLng(0);
    console.log('Android Coordinates: ' + lat, lng);    
        }

else if (Ti.Platform.osname === 'iphone' || 'ipad'){
    console.log('iOS version\n');
    var geo = require('geo');
    var lat = geo.getLat();
    geo.getLat();
    console.log('iOS Coordinates: ' + lat);
        }

Answer 1

You will need to use callback for accomplishing this task. The simple procedure is to pass a function (called callback) as parameter and instead using return; call the callback function.

Also you need not to call two methods for fetching latitude/longitude, because it can be done using one method only.

Example below :

In geo.js:

exports.getLatLong = function(callback){
    Ti.Geolocation.getCurrentPosition(function(e) {
        if (e.success) {
            Ti.API.info("Cords latitude" + e.coords.latitude);
            Ti.API.info("Cords longitude" + e.coords.longitude);
            callback(e.coords.latitude, e.coords.longitude);
        } else {
            alert("Unable to fetch cords");
        }
    });
};

Now in app.js, call the getLatLong function as:

var geo = require('geo'), lat = 0, long = 0;
geo.getLatLong(function(latitude,longitude) {
    lat = latitude;
    long = longitude;
});

Note : Use Ti.API.info instead of console.log.