using coordinate variables

Question

I have some problems with the javascript for my user coordinates. In all examples they print an alert message on the return callback from geolocation, but I want to use the lat,long coordinates for printing or setting other values. What is the problem with this code? Can anyone be kind and explain: :)

<script type="text/javascript">
navigator.geolocation.getCurrentPosition(success);

function success(position) {
 var lat = position.coords.latitude;
 var long = position.coords.longitude;
}

document.write(lat);
</script>

and this is the errorcode with phonegap:

05-12 16:40:35.486: E/Web Console(15962): ReferenceError: Can't find variable: lat at file:///android_asset/www/showMap/showMap.html:31

Thanks

w3schools.com/js/js_variables.asp

mjc
– mjc

2012-05-12 15:03:03 +00:00
Commented May 12, 2012 at 15:03 — mjc
– mjc, Commented May 12, 2012 at 15:03

Andrew Whitaker · Accepted Answer · 2012-05-12 15:07:47Z

3

You've declared lat and long inside the success function, so that is where they are scoped to. You cannot access them outside the success function.

You could change your code to something like:

navigator.geolocation.getCurrentPosition(success);

function success(position) {
 var lat = position.coords.latitude;
 var long = position.coords.longitude;
 // lat is accessible inside "success", we can write out the variable here:
 document.write(lat);
}

Just to be clear, even if you made lat and long global here it wouldn't help you. success is executed asynchronously after getCurrentPosition has finished running.

edited May 12, 2012 at 15:07

answered May 12, 2012 at 15:02

Andrew Whitaker

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1 Comment

Matt Ball Over a year ago

@user1391179 the only correct solution is to move dependent code into success. Welcome to callbacks and asynchrony.

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