How can I extract values from "getCurrentPosition" in JavaScript?

Question

I'm used to c-style programming, I cannot come up with how can I extract values from getCurrentPosition (function?).

For the case of this code,

navigator.geolocation.getCurrentPosition(function(pos) {
  var latitude = pos.coords.latitude;
  var longitude = pos.coords.longitude;
  document.write("Current pos : " + latitude + ", "+ longitude);
});

I'd like to change it to c-like code :

var a, b;
navigator.geolocation.getCurrentPosition(function(pos) {
  var latitude = pos.coords.latitude;
  var longitude = pos.coords.longitude;
  a = latitude;
  b = longitude;
  document.write("Current pos : " + latitude + ", "+ longitude);
});
document.write("Result " + a + " , " + b);

Is there any way to do this?

No, I just want to get values (latitude, longitude) outside of getCurrentPosition() ! — Wooni, Mar 18 '20 at 06:39

score -1 · Answer 1 · answered Mar 18 '20 at 06:31

Javascript is asynchrone, so you have to call

document.write("Result " + a + " , " + b)

inside the callback, try this:

<body>
  <script>
  var a, b;
  navigator.geolocation.getCurrentPosition(function(pos) {
  var latitude = pos.coords.latitude;
  var longitude = pos.coords.longitude;
  a = latitude;
  b = longitude;
  document.write("Current pos : " + latitude + ", "+ longitude);
  document.write("Result " + a + " , " + b);
});


  </script>
</body>

I want to get values a, b outside callback, Is it impossible? — Wooni, Mar 18 '20 at 06:43

How can I extract values from "getCurrentPosition" in JavaScript?

1 Answers1