index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Control and UIComponents - Custom context menu</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
    .container{width:100%;height:100%}
    #info{position:fixed;background-color:rgba(13, 13, 13, 0.5);padding:10px 10px 10px 10px;font:13px bold sans-serif;color:#fff;right:20px;top:20px;width:100px;height:40px;overflow:hidden}
    .custom_menu{width:90px;color:#fff;background-color:#051127;border:1px solid #0c2c45;list-style:none;padding:0}
    .custom_menu li{padding:0 8px;font-size:12px;line-height:24px}
    .custom_menu li:hover{background:#0e595e;cursor:pointer}
    .custom_menu li+li{border-top:1px solid #bbb}
  </style>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/maptalks.css">
  <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/dist/maptalks.min.js"></script>
  <body>
    <div id="map" class="container"></div>
    <div id="info"></div>

    <script>

      var map = new maptalks.Map('map', {
        center: [-0.113049,51.49856],
        zoom: 14,
        baseLayer: new maptalks.TileLayer('base', {
          urlTemplate: 'http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
          subdomains: ['a','b','c','d'],
          attribution: '&copy; <a href="http://osm.org">OpenStreetMap</a> contributors, &copy; <a href="https://carto.com/">CARTO</a>'
        })
      });

      var options = {
        'custom': true,
        'items'  : '<ul class="custom_menu">' +
          '<li onclick="clickItem(this);">Locate</li>' +
          '<li onclick="clickItem(this);">Mark</li>' +
          '<li onclick="clickItem(this);">Identify</li>' +
          '<li onclick="clickItem(this);">About</li>' +
          '</ul>'
      };
      map.setMenu(options).openMenu();

      map.on('contextmenu', function (e) {
        map.openMenu(e.coordinate);
      });

      function clickItem(dom) {
        document.getElementById('info').innerHTML = dom.innerText + ' clicked';
      }

    </script>
  </body>
</html>
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