Why is this HTML5 geolocation-dependent javascript code erring?

Question

I have some javascript code depending on geolocation.

var myLat = 0.0;
var myLng = 0.0;

function setCurrentPosition(position) {
 myLat = position.coords.latitude;
 myLng = position.coords.longitude;
}

function errorOccured() {
 document.write("sorry, error occured :( ");
}

$(function() {
 navigator.geolocation.getCurrentPosition(setCurrentPosition, errorOccured);
 document.write(myLat + " " + myLng);
});

However, this code merely produces

0 0

instead of

"client's latitude here" "client's longitude here"

Why?

I am using Google Chrome, which surely supports geolocation. I also allowed my browser to track my location.

Talha · Accepted Answer · 2012-03-20 07:25:11Z

2

GetCurrentPosition is an asynchronous function, and you can use it like

function GetGeolocation() {

navigator.geolocation.getCurrentPosition(GetCoords, GetError);

}
function GetCoords(position){

  var lat = position.coords.latitude;

  var long = position.coords.longitude;

  var accuracy = position.coords.accuracy;

  alert('Latitude: ' + lat + ', Longitude: '+ long);

}

answered Mar 20, 2012 at 7:25

Talha

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Comments

dangerChihuahua007 · Accepted Answer · 2012-03-20 05:11:09Z

0

Oh, I think I figured it out.

I believe that

navigator.geolocation.getCurrentPosition()

is an asynchronous function. Hence, setCurrentPosition(position) is called after the latitude and longitude values are printed on the screen, which prints the original values.

answered Mar 20, 2012 at 5:11

dangerChihuahua007

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1 Comment

dangerChihuahua007 Over a year ago

Well, that was awkward. I answered my own question. I hope this question helps others who have stumbled over similar issues :) Also, let me know if you have a better answer or explanation.

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