Is there a way to detect whether or not mobile device has location services enabled with JavaScript?

I am currently using Modernizr to detect whether or not geolocation is supported for a particular device. However, I want to display a more specific error message if geolocation is supported, but the user has disabled location services for their device.

I'm getting complaints that geolocatio开发者_高级运维n isn't working on supported browsers, when in fact it's just that the user hasn't enabled theirs.

I know there are ways to detect this using native mobile code, but is there a way to do this with JavaScript? Does Modernizr support this?

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Does your error callback ever fire? If you don't have one, try adding one. If it never fires, you can set a timeout on your function that if it does not receive permission within a certain amount of time, to display a notification.

Since the errorCallback never fires if geo is disabled, create a wrapper around the function that will create a settimeout on another function. If either of the callbacks to the api do fire, then remove the settimeout before it fires.

var timeOutId;
function disabledGeoHandler(){...}
function show_map() {
    clearTimeout(timOutId);
    ...
}
function show_map_error() {
    clearTimeout(timOutId);
    ...
}
function lookup_location() {
  timeOutId = setTimeout(disabledGeoHandler, 1000);
  navigator.geolocation.getCurrentPosition(show_map, show_map_error);
}

In fact, you could just use geo.js