How to get user's geolocation?

Question

On many sites I saw printed out my current city where I am (eg \"Hello to Berlin.\"). How they do that? What everything is needed for that? I guess the main part is here jav

Answer 1

If you prefer to use ES6 and promises here is another version

function getPositionPromised() {
  function successCb(cb) {
    return position => cb(position);
  }

  function errorCb(cb) {
    return () => cb('Could not retrieve geolocation');
  }

  return new Promise((resolve, reject) => {
    if (window.navigator.geolocation) {
      navigator.geolocation.getCurrentPosition(successCb(resolve), errorCb(reject));
    } else {
      return reject('No geolocation support');
    }
  })
}

And you can use it like this:

getPositionPromised()
  .then(position => {/*do something with position*/})
  .catch(() => {/*something went wrong*/})