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Use Geolocation API to center map by current location on load in certain cases #378

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Use Geolocation API to center map by current location on load in certain cases #378

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316fdac
Jump to latlng if given permission after map loads
mwpark2014 Dec 23, 2022
ace3c9f
Don't wait until map is loaded to recenter
mwpark2014 Dec 23, 2022
9343ffd
Don't recenter if there are pre-existing coords
mwpark2014 Dec 23, 2022
c325187
Be more specific in permission promise resolve
mwpark2014 Dec 23, 2022
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30 changes: 30 additions & 0 deletions client/src/pages/Map/Map.js
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,18 @@ const unsupportedError = (
</Box>
);

// If browser supports geolocation and there is no hash param on page load,
// let's check if we have geo permissions and use that to recenter map if so
let geoPermissionsPromise = Promise.resolve('unsupported');
if (
'geolocation' in navigator &&
!new URLSearchParams(window.location.hash.slice(1)).get('pos')
) {
geoPermissionsPromise = navigator.permissions.query({ name: 'geolocation' });
} else if ('geolocation' in navigator) {
Promise.resolve('denied');
}

function createPopupHTML({ common, scientific }) {
const commonString = common ? `<h4>${common}</h4>` : '';
const scientificString =
Expand Down Expand Up @@ -99,6 +111,24 @@ export default function Map({
}
}, [selectionEnabled]);

useEffect(() => {
const recenterOnLocation = async () => {
const result = await geoPermissionsPromise;
// Will return ['granted', 'prompt', 'denied', 'unsupported']
if (result.state === 'granted') {
navigator.geolocation.getCurrentPosition((position) => {
map.flyTo({
center: [position.coords.longitude, position.coords.latitude],
});
});
}
};

if (map) {
recenterOnLocation();
}
}, [map]);

useEffect(() => {
if (isMapboxSupported && !map && containerRef.current) {
const mapboxMap = new mapboxgl.Map({
Expand Down