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const LINKS = [
{
label: 'Google Maps',
url: 'https://www.google.com/maps/search/?api=1&query={lat},{lon}',
},
{
label: 'Apple Maps',
url: 'https://maps.apple.com/?q={lat},{lon}&t=m',
},
{
label: 'Default app',
url: 'geo:{lat},{lon}',
},
{
label: 'OpenStreetMap',
url: 'https://www.openstreetmap.org/?mlat={lat}&mlon={lon}&zoom=15&layers=M',
},
];
const content = document.getElementById('content');
route();
window.addEventListener('hashchange', route);
function route() {
const latLon = parseLatLon(location.hash.slice(1));
content.innerHTML = '';
if (!latLon) {
document.title = 'Share a location';
content.append(createEl('h1', {}, [document.title]));
const input = createEl('input', { placeholder: '55.7, 12.5' });
const shareInputButton = createEl('button', {}, ['Share']);
const inputGroup = createEl('div', { class: 'input-group' }, [input, shareInputButton]);
const errorDiv = createEl('div', { class: 'error' });
content.append(createEl('label', {}, ['Enter latitude, longitude', inputGroup]));
content.append(errorDiv);
function shareInput() {
if (!input.value.trim()) {
return;
}
try {
const [lat, lon] = parseLatLon(input.value);
shareLocation(lat, lon);
} catch (error) {
errorDiv.textContent = error;
}
}
input.addEventListener('keydown', (e) => {
if (e.key == 'Enter') {
shareInput();
}
});
shareInputButton.addEventListener('click', shareInput);
if (navigator.geolocation) {
const shareCurPos = createEl('button', {}, ['Share current position']);
content.append('or ', shareCurPos, errorDiv);
shareCurPos.addEventListener('click', () => {
navigator.geolocation.getCurrentPosition(
(pos) => {
shareLocation(pos.coords.latitude, pos.coords.longitude);
},
(err) => {
errorDiv.textContent = err.message;
},
);
});
}
} else {
document.title = 'Open location';
content.append(createEl('p', {}, ['Open in']));
const linkList = createEl('ul');
const [lat, lon] = latLon;
for (const linkSpec of LINKS) {
const url = linkSpec.url.replace('{lat}', lat).replace('{lon}', lon);
const link = createEl('a', { href: url }, [linkSpec.label]);
linkList.append(createEl('li', {}, [link]));
}
content.append(linkList);
}
}
function shareLocation(lat, lon) {
// TODO: use navigator.share if supported
window.location = `#${lat},${lon}`;
}
function parseLatLon(text) {
if (text == '') {
return null;
}
let [lat, lon] = text.split(',');
lat = parseFloat(lat);
lon = parseFloat(lon);
if (Number.isNaN(lat) || Number.isNaN(lon)) {
throw Error('failed to parse latitude or longitude');
}
if (lat < -180 || lat > 180 || lon < -90 || lon > 90) {
throw Error('latitude or longitude are out of range');
}
return [lat, lon];
}
function createEl(tag, attrs = {}, content = []) {
const el = document.createElement(tag);
for (const [name, value] of Object.entries(attrs)) {
el.setAttribute(name, value);
}
for (const child of content) {
el.append(child);
}
return el;
}
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