maptalks - Identify geometries by mouse click

Identify geometries by mouse click

index.html

<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>User Interactions - Identify geometries by mouse click</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
    .container{width:100%;height:100%}
    .pane{background:#34495e;line-height:28px;color:#fff;z-index:10;padding:10px;position:absolute;top:20px;right:20px}
  </style>
  <link rel="stylesheet" href="https://unpkg.com/maptalks/dist/maptalks.css">
  <script type="text/javascript" src="https://unpkg.com/maptalks/dist/maptalks.min.js"></script>
  <body>

    <div id="map" class="container"></div>
    <div class="pane">click on circles to identify</div>

    <script>

      var map = new maptalks.Map('map', {
        center: [-0.113049,51.498568],
        zoom: 14,
        attribution: true,
        baseLayer: new maptalks.TileLayer('base', {
          urlTemplate: 'https://{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 layer = new maptalks.VectorLayer('v').addTo(map);

      map.on('click', function (e) {
        //reset colors
        layer.forEach(function (g) {
          g.updateSymbol({
            'markerFill' : '#0e595e'
          });
        });
        //identify
        map.identify(
          {
            'coordinate' : e.coordinate,
            'layers' : [layer]
          },
          function (geos) {
            if (geos.length === 0) {
              return;
            }
            geos.forEach(function (g) {
              g.updateSymbol({
                'markerFill' : '#f00'
              });
            });
          }
        );
      });

      //prepare data
      var center = map.getCenter(), width = 0.055, height = 0.03,
        markers = [];
      for (var i = 65; i <= 90; i++) {
        var x = center.x + (Math.random() - 0.5) * width;
        var y = center.y + (Math.random() - 0.5) * height;
        markers.push(new maptalks.Marker([x, y], {
          'symbol' : {
            'textName' : String.fromCharCode(i),
            'textSize' : 30,
            'textFill' : 'White',
            'markerType' : 'ellipse',
            'markerFill' : '#0e595e',
            'markerFillOpacity' : 0.4,
            'markerLineWidth' : 2,
            'markerLineColor' : 'white',
            'markerWidth' : 70,
            'markerHeight' : 70
          }
        }));
      }
      layer.addGeometry(markers);

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

var map = new maptalks.Map('map', {
  center: [-0.113049, 51.498568],
  zoom: 14,
  attribution: true,
  baseLayer: new maptalks.TileLayer('base', {
    urlTemplate: 'https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
    subdomains: ["a", "b", "c", "d"],
    attribution: '© <a href="http://osm.org">OpenStreetMap</a>  contributors, © <a href="https://carto.com/">CARTO</a> '
  })
});

var layer = new maptalks.VectorLayer('v').addTo(map);

map.on('click', function(e) {
  //reset colors
  layer.forEach(function(g) {
    g.updateSymbol({
      'markerFill': '#0e595e'
    });
  });
  //identify
  map.identify({
      'coordinate': e.coordinate,
      'layers': [layer]
    },
    function(geos) {
      if (geos.length === 0) {
        return;
      }
      geos.forEach(function(g) {
        g.updateSymbol({
          'markerFill': '#f00'
        });
      });
    }
  );
});

//prepare data
var center = map.getCenter(),
  width = 0.055,
  height = 0.03,
  markers = [];
for (var i = 65; i <= 90; i++) {
  var x = center.x + (Math.random() - 0.5) * width;
  var y = center.y + (Math.random() - 0.5) * height;
  markers.push(new maptalks.Marker([x, y], {
    'symbol': {
      'textName': String.fromCharCode(i),
      'textSize': 30,
      'textFill': 'White',
      'markerType': 'ellipse',
      'markerFill': '#0e595e',
      'markerFillOpacity': 0.4,
      'markerLineWidth': 2,
      'markerLineColor': 'white',
      'markerWidth': 70,
      'markerHeight': 70
    }
  }));
}
layer.addGeometry(markers);