如何通过单击一个按钮在随机标记上连续更改 Google 地图中心

Question

我对编程还很陌生。我试图在 Google Maps API v3 上放置四个随机标记，并在网页上添加一个经典按钮，该按钮将使地图在这些标记上一个接一个地居中。如果中心位于第三个标记上，则下一次单击应使地图在第一个标记上居中，依此类推。我无法使用 jquery 或除经典 javascript 和 html 之外的任何其他库。

Answer 1

使用中的代码并向现有代码添加 map.panTo(marker.getPosition()); 将根据单击标记列表或单击按钮使地图居中。

全屏查看效果更佳

// Locations: [title, lat, long, number]
var locations = [
  ['Bar Termini', 51.51367, -0.12981, 1],
  ['French House', 51.51272, -0.13170, 2],
  ['Mark\'s Bar', 51.51133, -0.13563, 3],
  ['Hakkasan (bar)', 51.51017, -0.14474, 4],
  ['Bar Américain at Brasserie Zédel', 51.51027, -0.14474, 5],
  ['Experimental Cocktail Club', 51.51193, -0.13103, 6],
  ['Milk & Honey', 51.51377, -0.13653, 7],
  ['Blind Pig', 51.51379, -0.13668, 8],
  ['Opium', 51.51176, -0.13145, 9]
];
var gmarkers = [];
// Map Settings
var map = new google.maps.Map(document.getElementById("map"), {
  zoom: 16,
  center: new google.maps.LatLng(51.51367, -0.12981),
  mapTypeId: google.maps.MapTypeId.ROADMAP
});

var infowindow = new google.maps.InfoWindow;

var marker, i;
for (i = 0; i < locations.length; i++) {
  marker = new google.maps.Marker({
    position: new google.maps.LatLng(locations[i][1], locations[i][2]),
    map: map,
    label: String(locations[i][3])
  });
  gmarkers.push(marker);
  google.maps.event.addListener(marker, 'click', (function(marker, i) {
    return function() {
      infowindow.setContent(locations[i][0]);
      infowindow.open(map, marker);
      map.panTo(marker.getPosition());
    }
  })(marker, i));
}

function centerMap(obj) {
  google.maps.event.trigger(gmarkers[obj], 'click');
}

function pickRandom() {
  var rnd = Math.floor(Math.random() * 7) + 0;
  google.maps.event.trigger(gmarkers[rnd], 'click');
}

#map {
  height: 400px;
  width: 100%;
}

a {
  cursor: pointer;
}

<div data-role="page" id="map_result">
  <div data-role="header" data-position="fixed">
    <h1>Multiple Marker</h1>
  </div>
  <div data-role="content" style="padding:0;">
    <div id="map"></div>
    <button onclick="pickRandom()">Random Select</button>
    <div id="list">

      <ol>Click on Link Below
        <li onclick="centerMap(0)">
          <a>Bar Termini</a>
        </li>
        <li onclick="centerMap(1)">
          <a>French House</a>
        </li>
        <li onclick="centerMap(2)">
          <a>Mark's Bar</a>
        </li>
        <li onclick="centerMap(3)">
          <a>Hakkasan (bar)</a>
        </li>
        <li onclick="centerMap(4)">
          <a>Bar Americain at Brasserie Zedel</a>
        </li>
        <li onclick="centerMap(5)">
          <a>Experimental Cocktail Club</a>
        </li>
        <li onclick="centerMap(6)">
          <a>Milk &amp; Honey</a>
        </li>
        <li onclick="centerMap(7)">
          <a>Blind Pig</a>
        </li>
        <li onclick="centerMap(8)">
          <a>Opium</a>
        </li>
      </ol>
    </div>

  </div>
</div>

<script type="text/javascript" src="https://maps.google.com/maps/api/js"></script>

如何通过单击一个按钮在随机标记上连续更改 Google 地图中心

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markers