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SO に関するこの投稿から、Google マップ用の外部 JSON スタイル ファイルを安全にロードし、コールバック関数を使用して競合状態を回避する方法を学びました。ただし、そのコードを追加すると、そのコードを追加する前に機能していたマップ上の後続のすべての操作が機能しなくなったようです。

問題を示すスニペットを次に示します (javascript の 6 ～ 39 行目をコメントアウトし、41 ～ 49 行目をコメント解除すると、スタイリング以外のすべての機能が示されます)。

コールバック ベースの JSON マップ スタイルを追加すると、後続のすべての操作がどのように壊れましたか?

var map;
var myParser;
var markerClusterer;

function initMap() {
  function loadJSON(callback) {
    var xobj = new XMLHttpRequest();
    xobj.overrideMimeType("application/json");
    xobj.open('GET', 'https://api.myjson.com/bins/uvef2', true);
    const readyOK = 4;
    const responseOK = 200;
    xobj.onreadystatechange = function() {
      if (xobj.readyState === readyOK && xobj.status === responseOK) {
        callback(xobj.responseText);
      }
    };
    xobj.send(null);
  }
  var loaded_json;
  loadJSON(function(response) {
    loaded_json = JSON.parse(response);
 //   console.log("loaded json");
 //   console.log(loaded_json);
    var styledMapType = new google.maps.StyledMapType(loaded_json, {
      name: 'Map'
    });
    map = new google.maps.Map(document.getElementById('map'), {
      gestureHandling: 'greedy',
      center: {lat: 45.41, lng: -75.7},
      zoom: 14,
      mapTypeControlOptions: {
        mapTypeIds: ['roadmap', 'satellite', 'hybrid', 'terrain', 'styled_map']
      }
    });
//    console.log("loaded map");
    map.mapTypes.set('styled_map', styledMapType);
    map.setMapTypeId('styled_map');
    console.log("styled_map set");
  });

/*   map = new google.maps.Map(document.getElementById('map'), {
    gestureHandling: 'greedy',
    center: {lat: 45.41, lng: -75.7},
    zoom: 14,
    mapTypeControlOptions: {
      mapTypeIds: ['roadmap', 'satellite', 'hybrid', 'terrain', 'styled_map']
    }
  });
   */
	markerClusterer = new MarkerClusterer(map, [], {});
  myParser = new geoXML3.parser({
    map: map,
    zoom: false,
    markerOptions: {
      icon: {
        url: "http://maps.google.com/mapfiles/ms/icons/yellow-dot.png", // url
        scaledSize: new google.maps.Size(32, 32) // scaled size
      }
    },
    createMarker: function(placemark) {
      var marker = myParser.createMarker(placemark);
      markerClusterer.addMarker(marker);
      return marker;
    },
    afterParse: useData
  });
  myParser.parseKmlString(file2kml);

  function useData(docs) {
    console.log("parsed " + docs[0].placemarks.length + " placemarks");
  }
}
google.maps.event.addDomListener(window, 'load', initMap);

var file2kml = `<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
  <Document>
    <name>test placemarks</name>
    <Style id="icon-1899-DB4436-labelson">
      <IconStyle>
        <color>ff3644db</color>
        <scale>1</scale>
        <Icon>
          <href>http://maps.google.com/mapfiles/ms/icons/red-dot.png</href>
        </Icon>
        <hotSpot x="32" xunits="pixels" y="64" yunits="insetPixels"/>
      </IconStyle>
    </Style>
    <Placemark>
      <name>Church Of Ascension</name>
      <description><![CDATA[latitude: 45.410755<br>longitude: -75.681623]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.410755</value>
        </Data>
        <Data name="longitude">
          <value>-75.681623</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.681623,45.410755,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Bank Street Dragon</name>
      <description><![CDATA[latitude: 45.420032<br>longitude: -75.699788]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.420032</value>
        </Data>
        <Data name="longitude">
          <value>-75.699788</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.699788,45.420032,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Place Bell Canada</name>
      <description><![CDATA[latitude: 45.420214<br>longitude: -75.692603]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.420214</value>
        </Data>
        <Data name="longitude">
          <value>-75.692603</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.692603,45.420214,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>The Royal Canadian Legion Dominion Command</name>
      <description><![CDATA[latitude: 45.310682<br>longitude: -75.899762]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.310682</value>
        </Data>
        <Data name="longitude">
          <value>-75.899762</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.899762,45.310682,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Lieutenant Colonel John By</name>
      <description><![CDATA[latitude: 45.422076<br>longitude: -75.692515]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.422076</value>
        </Data>
        <Data name="longitude">
          <value>-75.692515</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.692515,45.422076,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Oscar Peterson, the Street Musician</name>
      <description><![CDATA[latitude: 45.42268<br>longitude: -75.693955]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.42268</value>
        </Data>
        <Data name="longitude">
          <value>-75.693955</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.693955,45.42268,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Somerset Square</name>
      <description><![CDATA[latitude: 45.406222<br>longitude: -75.722117]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.406222</value>
        </Data>
        <Data name="longitude">
          <value>-75.722117</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.722117,45.406222,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Windsor Park Flood Control</name>
      <description><![CDATA[latitude: 45.39149<br>longitude: -75.677548]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.39149</value>
        </Data>
        <Data name="longitude">
          <value>-75.677548</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.677548,45.39149,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Frank Clair Statue</name>
      <description><![CDATA[latitude: 45.397413<br>longitude: -75.683657]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.397413</value>
        </Data>
        <Data name="longitude">
          <value>-75.683657</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.683657,45.397413,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Ottawa Mill St. Brewpub</name>
      <description><![CDATA[latitude: 45.419537<br>longitude: -75.71263]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.419537</value>
        </Data>
        <Data name="longitude">
          <value>-75.71263</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.71263,45.419537,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>David Perry Memorial Bench</name>
      <description><![CDATA[latitude: 45.397002<br>longitude: -75.6743]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.397002</value>
        </Data>
        <Data name="longitude">
          <value>-75.6743</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.6743,45.397002,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Companions of the Cross</name>
      <description><![CDATA[latitude: 45.412132<br>longitude: -75.70911]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.412132</value>
        </Data>
        <Data name="longitude">
          <value>-75.70911</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.70911,45.412132,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>The Sunburst Building</name>
      <description><![CDATA[latitude: 45.419296<br>longitude: -75.699572]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.419296</value>
        </Data>
        <Data name="longitude">
          <value>-75.699572</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.699572,45.419296,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Rideau Curling Club</name>
      <description><![CDATA[latitude: 45.413011<br>longitude: -75.704687]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.413011</value>
        </Data>
        <Data name="longitude">
          <value>-75.704687</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.704687,45.413011,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Carling Otrain Station  </name>
      <description><![CDATA[latitude: 45.397474<br>longitude: -75.709528]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.397474</value>
        </Data>
        <Data name="longitude">
          <value>-75.709528</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.709528,45.397474,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Geese Artwork</name>
      <description><![CDATA[latitude: 45.417308<br>longitude: -75.700673]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.417308</value>
        </Data>
        <Data name="longitude">
          <value>-75.700673</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.700673,45.417308,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name><![CDATA[Saint Patrick\'s Basilica]]></name>
      <description><![CDATA[latitude: 45.41667<br>longitude: -75.70057]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.41667</value>
        </Data>
        <Data name="longitude">
          <value>-75.70057</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.70057,45.41667,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Headless Elephants</name>
      <description><![CDATA[latitude: 45.409045<br>longitude: -75.688275]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.409045</value>
        </Data>
        <Data name="longitude">
          <value>-75.688275</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.688275,45.409045,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Valour Bridge</name>
      <description><![CDATA[latitude: 45.310651<br>longitude: -75.901318]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.310651</value>
        </Data>
        <Data name="longitude">
          <value>-75.901318</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.901318,45.310651,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Marble Soccer Balls</name>
      <description><![CDATA[latitude: 45.404574<br>longitude: -75.711718]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.404574</value>
        </Data>
        <Data name="longitude">
          <value>-75.711718</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.711718,45.404574,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Shrine To Mary.</name>
      <description><![CDATA[latitude: 45.414046<br>longitude: -75.708891]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.414046</value>
        </Data>
        <Data name="longitude">
          <value>-75.708891</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.708891,45.414046,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Guigues Hall Saint Paul University</name>
      <description><![CDATA[latitude: 45.408308<br>longitude: -75.676281]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.408308</value>
        </Data>
        <Data name="longitude">
          <value>-75.676281</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.676281,45.408308,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Ottawa Chinese Bible Church</name>
      <description><![CDATA[latitude: 45.41234<br>longitude: -75.680081]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.41234</value>
        </Data>
        <Data name="longitude">
          <value>-75.680081</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.680081,45.41234,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Canadian Bank Note Company</name>
      <description><![CDATA[latitude: 45.395734<br>longitude: -75.745783]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.395734</value>
        </Data>
        <Data name="longitude">
          <value>-75.745783</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.745783,45.395734,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Dominion Arboretum</name>
      <description><![CDATA[latitude: 45.391174<br>longitude: -75.704042]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.391174</value>
        </Data>
        <Data name="longitude">
          <value>-75.704042</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.704042,45.391174,0
        </coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>BiTe This</name>
      <description><![CDATA[latitude: 45.395077<br>longitude: -75.747579]]></description>
      <styleUrl>#icon-1899-DB4436-labelson</styleUrl>
      <ExtendedData>
        <Data name="latitude">
          <value>45.395077</value>
        </Data>
        <Data name="longitude">
          <value>-75.747579</value>
        </Data>
      </ExtendedData>
      <Point>
        <coordinates>
          -75.747579,45.395077,0
        </coordinates>
      </Point>
    </Placemark>
  </Document>
</kml>
`;
html,
body {
  height: 100%;
  ;
  width: 100%;
  padding: 0px;
  margin: 0px;
}

#map {
  height: 90%;
  width: 100%;
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<script src="https://cdn.rawgit.com/geocodezip/geoxml3/master/polys/geoxml3.js"></script>
<script src="https://cdn.rawgit.com/googlemaps/v3-utility-library/master/markerclustererplus/src/markerclusterer.js"></script>
<div id="map"></div>

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