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KML feature details

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JavaScript
function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 12,
    center: {lat: 37.06, lng: -95.68}
  });

  var kmlLayer = new google.maps.KmlLayer({
    url: 'http://kml-samples.googlecode.com/svn/trunk/kml/Placemark/placemark.kml',
    suppressInfoWindows: true,
    map: map
  });

  kmlLayer.addListener('click', function(kmlEvent) {
    var text = kmlEvent.featureData.description;
    showInContentWindow(text);
  });

  function showInContentWindow(text) {
    var sidediv = document.getElementById('content-window');
    sidediv.innerHTML = text;
  }
}
JavaScript + HTML
<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0">
    <meta charset="utf-8">
    <title>KML feature details</title>
    <style>
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        float: left;
        height: 100%;
        width: 79%;
      }
      #content-window {
        float: left;
        font-family: 'Roboto','sans-serif';
        height: 100%;
        line-height: 30px;
        padding-left: 10px;
        width: 19%;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <div id="content-window"></div>
    <script>

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 12,
    center: {lat: 37.06, lng: -95.68}
  });

  var kmlLayer = new google.maps.KmlLayer({
    url: 'http://kml-samples.googlecode.com/svn/trunk/kml/Placemark/placemark.kml',
    suppressInfoWindows: true,
    map: map
  });

  kmlLayer.addListener('click', function(kmlEvent) {
    var text = kmlEvent.featureData.description;
    showInContentWindow(text);
  });

  function showInContentWindow(text) {
    var sidediv = document.getElementById('content-window');
    sidediv.innerHTML = text;
  }
}

    </script>
    <script async defer
        src="https://maps.googleapis.com/maps/api/js?signed_in=true&callback=initMap">
    </script>
  </body>
</html>

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