Question

我正在尝试将一些来自SQL DB的LatLongs加载到webpage上的Google Maps API中。我一直在关注这个tutorial，甚至直接从它复制代码，因为我是一个Javascript noob。

到目前为止我所拥有的是：

- 可以从页面右侧的表单添加协调（它们显示在phpMyAdmin中）

- 制作一个laLongs的xml的php脚本完美无缺（你的意思是我只能获得2个链接？）

问题是标记不会显示在地图上，但地图仍然加载。在我尝试重写页面以更好地匹配教程中的代码之后，地图本身将不会加载。我已经阅读了SE上与本教程有关的其他一些线程，但这些内容似乎没有任何作用......

<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBvwCMuLz31gLXoawbDBntieQjGPMrf5vA" type="text/javascript"></script>
    <script type="text/javascript">
    //<![CDATA[

    var customIcons = {
      well: {
        icon: 'http://labs.google.com/ridefinder/images/mm_20_blue.png',
        shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
      }
    };

    function load() {
      var map = new google.maps.Map(document.getElementById("map"), {
        center: new google.maps.LatLng(55.000, -115.000),
        zoom: 6
      });
      var infoWindow = new google.maps.InfoWindow;

      // Change this depending on the name of your PHP file
      downloadUrl("create_xml.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 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/>";
          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);
        }
      });
    }

    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="float:left; width:50%;"></div>

提前致谢！

Answer 1

您当前的问题是您的地图没有尺寸。你改变了这个：

<div id="map" style="width: 500px; height: 300px"></div>

为：

<div id="map" style="float:left; width:50%; height:100%"></div>

为此，您还需要添加额外的css：

html, body {
  height: 100%;
  width: 100%;
}

概念验证片段：

var customIcons = {
  well: {
    icon: 'http://labs.google.com/ridefinder/images/mm_20_blue.png',
    shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
  }
};

function load() {
  var map = new google.maps.Map(document.getElementById("map"), {
    center: new google.maps.LatLng(55.000, -115.000),
    zoom: 6,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  });
  var infoWindow = new google.maps.InfoWindow();
}
load();

html,
body {
  height: 100%;
  width: 100%;
}

<script src="https://maps.googleapis.com/maps/api/js?v=3" type="text/javascript"></script>

  <div id="map" style="float:left; width:50%; height:100%;"></div>

  <div style="float:right; width:50%;">
    <h1>WellMap</h1>
    <br>
    <!-- <img src="well_icon.png"> -->
    <br>

    <form name="new_well" method="" action="">
      Well Name:
      <input type="text" name="wellName" id="wellName"/>
      <br/>Well Latitude:
      <input type="text" name="wellLat" id="wellLat" />
      <br/>Well Longitude:
      <input type="text" name="wellLong" id="wellLong" />
      <br/>
      <input type="submit" name="submit" value="Add Well" />
    </form>
  </div>

通过XML放置来自PHP / SQL的GoogleMap标记

1 个答案: