javascript - 标记不会出现在 GeoChart 上，但 map 显示得很好

Question

我在将地理图表标记加载到 map 上时遇到问题。 Google 提供的脚本在我的网站上呈现空白 map ，但标记和 map 在 jsfiddle 上显示应有的样子。任何帮助将不胜感激。

代码如下:

<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script> 
<script type="text/javascript" src="https://www.google.com/jsapi"></script>

<script type="text/javascript">

google.charts.load('current', {'packages': ['geochart']});
google.charts.setOnLoadCallback(drawMarkersMap);

  function drawMarkersMap() {
  var data = google.visualization.arrayToDataTable([
    ['City', 'Collaborator'],
    ['Detroit', "text here"],
    ['Cleveland', "text here"],
    ['Joondalup', "text here"],
    ['Wanaka', "text here"]
    ['Liverpool', "text here"],
    ['Styria', "text here"],
    ['Edwardsville', "text here"],
    ['Austin', "text here"],
    ['Houston', "text here"],
    ['Stockholm', "text here"],
    ]);

  var options = {
    region: 'world',
    displayMode: 'markers',
    backgroundColor: '#252426',
    colorAxis: {colors: ['blue']},
    magnifyingGlass: {enable: false},
    defaultColor: '#f1910e',
    enableRegionInteractivity: 'true',
     };

  var chart = new google.visualization.GeoChart(document.getElementById('chart_div'));
  chart.draw(data, options);
};
</script>

Answer 1

我明白了!显然，谷歌现在需要 API key 才能在地理图表上显示标记。这是修改后的功能脚本。 第二行是唯一的变化。

<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script> 
<script type="text/javascript" src="//maps.googleapis.com/maps/api/js?key=YOUR_API_KEY_GOES_HERE" async="" defer="defer"></script>

<script type="text/javascript">

google.charts.load('current', {'packages': ['geochart']});
google.charts.setOnLoadCallback(drawMarkersMap);

function drawMarkersMap() {
var data = google.visualization.arrayToDataTable([
['City', 'Collaborator'],
['Detroit', "text here"],
['Cleveland', "text here"],
['Joondalup', "text here"],
['Wanaka', "text here"]
['Liverpool', "text here"],
['Styria', "text here"],
['Edwardsville', "text here"],
['Austin', "text here"],
['Houston', "text here"],
['Stockholm', "text here"],
]);

var options = {
region: 'world',
displayMode: 'markers',
backgroundColor: '#252426',
colorAxis: {colors: ['blue']},
magnifyingGlass: {enable: false},
defaultColor: '#f1910e',
enableRegionInteractivity: 'true',
};

var chart = new google.visualization.GeoChart(document.getElementById('chart_div'));
chart.draw(data, options);
};
</script>

只要您的网站没有收到太多流量，API key 就可以通过 Google 免费获得。您需要注册一个“浏览器 key ”。这是进行设置的链接: https://developers.google.com/maps/documentation/javascript/get-api-key