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我正在从事的这个项目有一个纬度和经度字段。我正在尝试整合对外部信息源的需求，并尝试将 Google Maps API 合并到这个项目中。我对 JavaScript 和 Google Maps API 非常熟悉。我的目标是让您单击一个链接，该链接会打开一个新窗口并显示谷歌地图。然后，您可以滚动、缩放等以找到您想要的内容，然后单击，窗口关闭，纬度/经度神奇地填充在原始页面上。我还想让地图显示已从数据库中单击的现有标记。我一直在关注这个https://developers.google.com/maps/articles/phpsqlajax_v3，现在在底部添加了 Lat/Long 字段。建议我使用

google.maps.event.addListener(marker, 'click', function (event) {
document.getElementById("latbox").value = this.getPosition().lat();
document.getElementById("lngbox").value = this.getPosition().lng();
});

但是，因为我是 n00b，所以我不知道在教程中的代码块中将该代码放在哪里工作：

function load() {
      var map = new google.maps.Map(document.getElementById("map"), {
        center: new google.maps.LatLng(47.6145, -122.3418),
        zoom: 13,
        mapTypeId: 'roadmap'
      });

      var infoWindow = new google.maps.InfoWindow;

      // Change this depending on the name of your PHP file
      downloadUrl("getdata.php", function(data) {
        var xml = data.responseXML;
        var markers = xml.documentElement.getElementsByTagName("marker");
        for (var i = 0; i < markers.length; i++) {
          var name = markers[i].getAttribute("name");
          var address = markers[i].getAttribute("address");
          var type = markers[i].getAttribute("type");
          var point = new google.maps.LatLng(
              parseFloat(markers[i].getAttribute("lat")),
              parseFloat(markers[i].getAttribute("lng")));
          var html = "<b>" + name + "</b> <br/>" + address;
          var icon = customIcons[type] || {};
          var marker = new google.maps.Marker({
            map: map,
            position: point,
            icon: icon.icon,
            shadow: icon.shadow
          });
          bindInfoWindow(marker, map, infoWindow, html);
        }
      });
    }

    google.maps.event.addListener(marker, 'click', function (event) {
        document.getElementById("latbox").value = this.getPosition().lat();
        document.getElementById("lngbox").value = this.getPosition().lng();
    });

    function bindInfoWindow(marker, map, infoWindow, html) {
      google.maps.event.addListener(marker, 'click', function() {
        infoWindow.setContent(html);
        infoWindow.open(map, marker);
      });
    }

    function downloadUrl(url, callback) {
      var request = window.ActiveXObject ?
          new ActiveXObject('Microsoft.XMLHTTP') :
          new XMLHttpRequest;

      request.onreadystatechange = function() {
        if (request.readyState == 4) {
          request.onreadystatechange = doNothing;
          callback(request, request.status);
        }
      };

      request.open('GET', url, true);
      request.send(null);
    }
    function doNothing() {}
  </script>
  </head>
  <body onload="load()">
    <div id="map" style="width: 1024px; height: 800px"></div>
    <input type="text" name="latFld" id="latFld" /><br />
    <input type="text" name="lngFld" id="lngFld" /><br />

  </body>
</html>
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