Create a draggable point
Drag the point to a new location on a map and populate its coordinates in a display.
<!DOCTYPE html><html><head><meta charset="utf-8" /><title>Create a draggable point</title><meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" /><script src="https://cdn.jsdelivr.net/npm/@goongmaps/goong-js@1.0.9/dist/goong-js.js"></script><link href="https://cdn.jsdelivr.net/npm/@goongmaps/goong-js@1.0.9/dist/goong-js.css" rel="stylesheet" /><style> body { margin: 0; padding: 0; } #map { position: absolute; top: 0; bottom: 0; width: 100%; }</style></head><body><style>.coordinates {background: rgba(0, 0, 0, 0.5);color: #fff;position: absolute;bottom: 40px;left: 10px;padding: 5px 10px;margin: 0;font-size: 11px;line-height: 18px;border-radius: 3px;display: none;}</style> <div id="map"></div><pre id="coordinates" class="coordinates"></pre> <script>var coordinates = document.getElementById('coordinates');goongjs.accessToken = '8qzxZAuxcsctSlmOszInchP1A5GrmRBHJwCBCjO6';var map = new goongjs.Map({container: 'map',style: 'https://tiles.goong.io/assets/goong_map_web.json',center: [0, 0],zoom: 2}); var canvas = map.getCanvasContainer(); var geojson = {'type': 'FeatureCollection','features': [{'type': 'Feature','geometry': {'type': 'Point','coordinates': [0, 0]}}]}; function onMove(e) {var coords = e.lngLat; // Set a UI indicator for dragging.canvas.style.cursor = 'grabbing'; // Update the Point feature in `geojson` coordinates// and call setData to the source layer `point` on it.geojson.features[0].geometry.coordinates = [coords.lng, coords.lat];map.getSource('point').setData(geojson);} function onUp(e) {var coords = e.lngLat; // Print the coordinates of where the point had// finished being dragged to on the map.coordinates.style.display = 'block';coordinates.innerHTML ='Longitude: ' + coords.lng + '<br />Latitude: ' + coords.lat;canvas.style.cursor = ''; // Unbind mouse/touch eventsmap.off('mousemove', onMove);map.off('touchmove', onMove);} map.on('load', function () {// Add a single point to the mapmap.addSource('point', {'type': 'geojson','data': geojson}); map.addLayer({'id': 'point','type': 'circle','source': 'point','paint': {'circle-radius': 10,'circle-color': '#3887be'}}); // When the cursor enters a feature in the point layer, prepare for dragging.map.on('mouseenter', 'point', function () {map.setPaintProperty('point', 'circle-color', '#3bb2d0');canvas.style.cursor = 'move';}); map.on('mouseleave', 'point', function () {map.setPaintProperty('point', 'circle-color', '#3887be');canvas.style.cursor = '';}); map.on('mousedown', 'point', function (e) {// Prevent the default map drag behavior.e.preventDefault(); canvas.style.cursor = 'grab'; map.on('mousemove', onMove);map.once('mouseup', onUp);}); map.on('touchstart', 'point', function (e) {if (e.points.length !== 1) return; // Prevent the default map drag behavior.e.preventDefault(); map.on('touchmove', onMove);map.once('touchend', onUp);});});</script> </body></html>