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When GPS permission is denied, poll for permission changes #87

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When GPS permission is denied, poll for permission changes #87

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28 changes: 26 additions & 2 deletions packages/mdg:geolocation/geolocation.js
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Original file line number Diff line number Diff line change
@@ -1,3 +1,6 @@
// https://developer.mozilla.org/en-US/docs/Web/API/PositionError
var PERMISSION_DENIED = 1;

// is location refreshing currently on?
var watchingPosition = false;

Expand All @@ -14,18 +17,39 @@ var options = {
timeout: 10000
};

var polling = false;
var currentWatch = null;

// calling watchPosition checks to see whether you now have gps permissions
var checkForPermissionChanges = function () {
navigator.geolocation.clearWatch(currentWatch);
currentWatch = navigator.geolocation.watchPosition(onPosition, onError, options);

Meteor.setTimeout(function () {
if (polling) {
checkForPermissionChanges();
}
}, 10000);
};

var onError = function (newError) {
error.set(newError);

if (newError.code === PERMISSION_DENIED && ! polling) {
polling = true;
checkForPermissionChanges();
}
};

var onPosition = function (newLocation) {
location.set(newLocation);
error.set(null);
polling = false;
};

var startWatchingPosition = function () {
if (! watchingPosition && navigator.geolocation) {
navigator.geolocation.watchPosition(onPosition, onError, options);
currentWatch = navigator.geolocation.watchPosition(onPosition, onError, options);
watchingPosition = true;
}
};
Expand Down Expand Up @@ -59,7 +83,7 @@ Geolocation = {
return location.get();
},
// simple version of location; just lat and lng

/**
* @summary Get the current latitude and longitude
* @return {Object | null} An object with `lat` and `lng` properties,
Expand Down