Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
<html>
<head>
<script>
let userLatitude = parseFloat('45.532032');
let userLongitude = parseFloat('-73.595368');
let stationsInfosEndpoint = 'https://api-core.bixi.com/gbfs/en/station_information.json';
let stationsStatusEndpoint = 'https://api-core.bixi.com/gbfs/en/station_status.json';
let xhr = new XMLHttpRequest();
xhr.open('GET', stationsInfosEndpoint, false);
xhr.send(null);
let stationsinfosResponse = JSON.parse(xhr.responseText);
let stationsinfos = stationsinfosResponse.data.stations;
xhr = new XMLHttpRequest();
xhr.open('GET', stationsStatusEndpoint, false);
xhr.send(null);
let stationsstatusResponse = JSON.parse(xhr.responseText);
let stationsstatus = stationsstatusResponse.data.stations;
let listOfStations = [];
for (let i = 0; i < stationsinfos.length; i++)
{
let stationInfo = stationsinfos[i];
let id = stationInfo.station_id;
let stationStatus = stationsstatus.find(s => s.station_id == id);
if(stationStatus != null
&& stationStatus.is_installed == 1
&& stationStatus.is_renting == 1
&& stationStatus.num_bikes_available > 0)
{
let stationLatitude = parseFloat(stationInfo.lat);
let stationLongitude = parseFloat(stationInfo.lon);
let distance = haversineDistance(stationLatitude, stationLongitude, userLatitude, userLongitude, false);
let station = {
"id" : id,
"name": stationInfo.name,
"distance": distance,
"bikes": stationStatus.num_bikes_available
}
listOfStations.push(station);
}
}
listOfStations.sort((s1, s2) => parseFloat(s1.distance) - parseFloat(s2.distance));
let nearMe = JSON.stringify(listOfStations.slice(0,4));
document.write(nearMe);
function haversineDistance(lat1, lon1, lat2, lon2, isMiles = false)
{
const toRadian = angle => (Math.PI / 180) * angle;
const distance = (a, b) => (Math.PI / 180) * (a - b);
const RADIUS_OF_EARTH_IN_KM = 6371;
const dLat = distance(lat2, lat1);
const dLon = distance(lon2, lon1);
lat1 = toRadian(lat1);
lat2 = toRadian(lat2);
// Haversine Formula
const a =
Math.pow(Math.sin(dLat / 2), 2) +
Math.pow(Math.sin(dLon / 2), 2) * Math.cos(lat1) * Math.cos(lat2);
const c = 2 * Math.asin(Math.sqrt(a));
let finalDistance = RADIUS_OF_EARTH_IN_KM * c;
if (isMiles) {
finalDistance /= 1.60934;
}
return finalDistance;
}
</script>
</head>
<body></body>
</html>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment