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Add hashstring to allow linking to a particular view of the map

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Antonia 2024-11-26 13:49:17 +01:00
parent c484979e13
commit 4481473638
1 changed files with 21 additions and 0 deletions
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21
frontend/map.js
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@ -12,6 +12,24 @@ legend.onAdd = function (map) {
const map = L.map("map", { center: [52,13], zoom: 3, minZoom: 0 });
function update_hash() {
const {lat, lng} = this.getCenter();
const zoom = this.getZoom();
const digits = 4;
window.history.replaceState(null, '', `#map=${zoom}/${lat.toFixed(digits)}/${lng.toFixed(digits)}`);
}
function onHashChange() {
const hash = document.location.hash;
const coords = decodeURIComponent(hash.slice(5)).split("/") // strip off the #map= part
const latLng = L.latLng(parseFloat(coords[1]), parseFloat(coords[2]));
map.setView(latLng, parseInt(coords[0]));
}
map.on("moveend", update_hash);
map.on("zoomend", update_hash);
fetch("layers.json")
.then((response) => response.json())
.then((data) => {
@ -52,3 +70,6 @@ window.addEventListener('resize', () => {
resize();
});
window.addEventListener("hashchange", onHashChange);
onHashChange();