Global Javascript variables defined in the function

Question

I am trying to make variables lat and loc global, but they are always zero.

var lat=0;
var loc=0;

navigator.geolocation.getCurrentPosition(function(position) {
     lat = position.coords.latitude;
     loc = position.coords.longitude;
});

alert(lat); // this eqals zero

possible duplicate of how to change value of global variable inside of function — David Robinson
– David Robinson, Commented Jul 3, 2015 at 14:31
Nice, that's what I explained in my answer! @DavidRobinson! Still not a duplicate of that answer. — Praveen Kumar Purushothaman
– Praveen Kumar Purushothaman, Commented Jul 3, 2015 at 14:32

Praveen Kumar Purushothaman · Accepted Answer · 2015-07-03 14:30:26Z

2

That's an asynchronous call! Use this way:

navigator.geolocation.getCurrentPosition(function(position) {
    lat = position.coords.latitude;
    loc = position.coords.longitude;
    alert (lat);
});

Background

When you are firing alert(lat), the getCurrentPosition() wouldn't have fired and your value might have not set. If you wanna do something, put it or call it inside that function.

navigator.geolocation.getCurrentPosition(function(position) {
    lat = position.coords.latitude;
    loc = position.coords.longitude;
    // Something like this.
    calculate (lat, loc);
});

answered Jul 3, 2015 at 14:30

Praveen Kumar Purushothaman

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