79c8afdba8
To have the same path (starting with `ol/`, without `.js`) as in the documentation. The support was added in the webpack config in #8928
75 lines
1.8 KiB
JavaScript
75 lines
1.8 KiB
JavaScript
import Map from 'ol/Map';
|
|
import View from 'ol/View';
|
|
import TileLayer from 'ol/layer/Tile';
|
|
import OSM from 'ol/source/OSM';
|
|
|
|
// default zoom, center and rotation
|
|
let zoom = 2;
|
|
let center = [0, 0];
|
|
let rotation = 0;
|
|
|
|
if (window.location.hash !== '') {
|
|
// try to restore center, zoom-level and rotation from the URL
|
|
const hash = window.location.hash.replace('#map=', '');
|
|
const parts = hash.split('/');
|
|
if (parts.length === 4) {
|
|
zoom = parseInt(parts[0], 10);
|
|
center = [
|
|
parseFloat(parts[1]),
|
|
parseFloat(parts[2])
|
|
];
|
|
rotation = parseFloat(parts[3]);
|
|
}
|
|
}
|
|
|
|
const map = new Map({
|
|
layers: [
|
|
new TileLayer({
|
|
source: new OSM()
|
|
})
|
|
],
|
|
target: 'map',
|
|
view: new View({
|
|
center: center,
|
|
zoom: zoom,
|
|
rotation: rotation
|
|
})
|
|
});
|
|
|
|
let shouldUpdate = true;
|
|
const view = map.getView();
|
|
const updatePermalink = function() {
|
|
if (!shouldUpdate) {
|
|
// do not update the URL when the view was changed in the 'popstate' handler
|
|
shouldUpdate = true;
|
|
return;
|
|
}
|
|
|
|
const center = view.getCenter();
|
|
const hash = '#map=' +
|
|
view.getZoom() + '/' +
|
|
Math.round(center[0] * 100) / 100 + '/' +
|
|
Math.round(center[1] * 100) / 100 + '/' +
|
|
view.getRotation();
|
|
const state = {
|
|
zoom: view.getZoom(),
|
|
center: view.getCenter(),
|
|
rotation: view.getRotation()
|
|
};
|
|
window.history.pushState(state, 'map', hash);
|
|
};
|
|
|
|
map.on('moveend', updatePermalink);
|
|
|
|
// restore the view state when navigating through the history, see
|
|
// https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onpopstate
|
|
window.addEventListener('popstate', function(event) {
|
|
if (event.state === null) {
|
|
return;
|
|
}
|
|
map.getView().setCenter(event.state.center);
|
|
map.getView().setZoom(event.state.zoom);
|
|
map.getView().setRotation(event.state.rotation);
|
|
shouldUpdate = false;
|
|
});
|