Create a draggable Marker

Drag the marker to a new location on a map and populate its coordinates in a display. See the example: https://docs.mapbox.com//mapbox-gl-js/example/drag-a-marker/

by Nikolay Petrov

HTML

<script src="https://api.mapbox.com/mapbox-gl-js/v2.1.0/mapbox-gl.js"></script>
<link rel="stylesheet" href="https://api.mapbox.com/mapbox-gl-js/v2.1.0/mapbox-gl.css">
<div id="map"></div>
<pre id="coordinates" class="coordinates"></pre>

CSS

body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }

    .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;
    }

JavaScript

mapboxgl.accessToken = 'pk.eyJ1IjoicGV0cm92bm4iLCJhIjoiVHJkcXROMCJ9.hzniKblVA-O0YJSvCfwztg';
    var coordinates = document.getElementById('coordinates');
    var map = new mapboxgl.Map({
        container: 'map',
        style: 'mapbox://styles/mapbox/streets-v11',
        center: [0, 0],
        zoom: 2
    });

    var marker = new mapboxgl.Marker({
        draggable: true
    })
        .setLngLat([0, 0])
        .addTo(map);

    function onDragEnd() {
        var lngLat = marker.getLngLat();
        coordinates.style.display = 'block';
        coordinates.innerHTML =
            'Longitude: ' + lngLat.lng + '<br />Latitude: ' + lngLat.lat;
    }

    marker.on('dragend', onDragEnd);