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navigator.geolocation.getCurrentPosition

Geolocation API Specification 2nd Edition

W3C Recommendation 8 November 2016 (GitHub reference added 31 January 2018)

https://www.w3.org/TR/geolocation-API/

https://w3c.github.io/geolocation-api/

https://developer.mozilla.org/en-US/docs/Web/API/Geolocation/getCurrentPosition

var options = {
  enableHighAccuracy: true,
  timeout: 5000,
  maximumAge: 0
};

function success(pos) {
  var crd = pos.coords;

  console.log('Your current position is:');
  console.log(`Latitude : ${crd.latitude}`);
  console.log(`Longitude: ${crd.longitude}`);
  console.log(`More or less ${crd.accuracy} meters.`);
}

function error(err) {
  console.warn(`ERROR(${err.code}): ${err.message}`);
}


navigator.geolocation.getCurrentPosition(success, error, options);

bug

https://stackoverflow.com/questions/3397585/navigator-geolocation-getcurrentposition-sometimes-works-sometimes-doesnt

if (navigator.geolocation) {
    var location_timeout = setTimeout("geolocFail()", 10000);

    navigator.geolocation.getCurrentPosition(function(position) {
        clearTimeout(location_timeout);

        var lat = position.coords.latitude;
        var lng = position.coords.longitude;

        geocodeLatLng(lat, lng);
    }, function(error) {
        clearTimeout(location_timeout);
        geolocFail();
    });
} else {
    // Fallback for no geolocation
    geolocFail();
}

GPS & smart phone

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https://www.freecodecamp.org/forum/t/problems-with-react-rendering-twice/268945

https://codepen.io/xgqfrms/pen/OJyrPGj?editors=0011

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