index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Control and UIComponents - Custom InfoWindow</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
    .container{width:100%;height:100%}
    .content{color:#fff;width:190px;height:128px;background-color:#051127;border:1px solid #0c2c45}
    .pop_title{float:left;padding-left:10px;width:180px;height:36px;line-height:36px;background:url(title.png);font-weight:bold;font-size:16px}
    .pop_time{float:left;width:183px;height:30px;margin:0 10px;line-height:36px}
    .pop_dept{float:left;padding:5px;max-width:65px;line-height:15px;text-align:center;border:1px solid #192b41;margin:0 10px}
    .pop_arrow{float:left;width:15px;height:24px;line-height:24px;background:url(arrow.png) no-repeat center center}
    .arrow{display:block;width:17px;height:10px;background:url(em.png) no-repeat;position:absolute;left:50%;margin-left:-5px;bottom:-10px}
  </style>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/maptalks@0.40.3/dist/maptalks.css">
  <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/maptalks@0.40.3/dist/maptalks.min.js"></script>
  <body>

    <div id="map" class="container"></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 coordinate = map.getCenter().toFixed(3);

      var options = {
        //'autoOpenOn' : 'click',  //set to null if not to open window when clicking on map
        'single' : false,
        'width'  : 183,
        'height' : 105,
        'custom' : true,
        'dx' : -3,
        'dy' : -12,
        'content'   : '<div class="content">' +
          '<div class="pop_title">Custom InfoWindow</div>' +
          '<div class="pop_time">' + new Date().toLocaleTimeString() + '</div><br>' +
          '<div class="pop_dept">' + coordinate.x + '</div>' +
          '<div class="pop_dept">' + coordinate.y + '</div>' +
          '<div class="arrow"></div>' +
          '</div>'
      };
      var infoWindow = new maptalks.ui.InfoWindow(options);
      infoWindow.addTo(map).show(coordinate);

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