Is there a way to check if geolocation has been DECLINED with Javascript?

watchPosition and getCurrentPosition both accept a second callback which is invoked when there is an error. The error callback provides an argument for an error object. For permission denied, error.code would be error.PERMISSION_DENIED (numeric value 1).

Read more here: https://developer.mozilla.org/en/Using_geolocation

Example:

navigator.geolocation.watchPosition(function(position) {
    console.log("i'm tracking you!");
  },
  function(error) {
    if (error.code == error.PERMISSION_DENIED)
      console.log("you denied me :-(");
  });

EDIT: As @Ian Devlin pointed out, it doesn't seem Firefox (4.0.1 at the time of this post) supports this behavior. It works as expected in Chrome and probably Safari etc.

Without prompting the user, you can use the new permission api this is available as such:

navigator.permissions.query({ name: 'geolocation' })
.then(console.log)

(only works for Blink & Firefox)

http://caniuse.com/#feat=permissions-api