javascript - 传单 geojson 不会显示标记

Question

我正在尝试在我的应用程序中用带有传单的标记来可视化一个点。 为此，我正在构建一个功能，该功能正在测试网站上运行(https://embed.plnkr.co/plunk/iiGl5i)

[{"type":"Feature","geometry":{"type":"Point","coordinates":[30.0,34.0]},"properties":{"divesite_id":8,"name":"Cyprus, Larnaca, Zenobia","show_on_map":true}}]

如果我使用 L.marker 和 addTo(map)，则与传单的集成有效，但与 geojson 的集成无效。

application.html.erb

<link rel="stylesheet" href="https://unpkg.com/leaflet@1.6.0/dist/leaflet.css"
   integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ=="
   crossorigin=""/>
   <script src="https://unpkg.com/leaflet@1.6.0/dist/leaflet.js"
   integrity="sha512-gZwIG9x3wUXg2hdXF6+rVkLF/0Vi9U8D2Ntg4Ga5I5BZpVkVxlJWbSQtXPSiUTtC0TjtGOmxa1AJPuV0CPthew=="
   crossorigin=""></script>

   <style>
     #map {height: 400px}
   </style>

_form.html.erb

<div id=map></div>
<script>
  var lng = '<%= @divesite.longitude %>';
  var lat = '<%= @divesite.latitude %>';
  var popup = '<b><%= @divesite.name %></b><br><%= @divesite.description %>';
  var geojson = '<%= @geojson %>';
  var map = L.map('map').setView([lat, lng], 5);
  L.tileLayer('https://api.maptiler.com/maps/topo/{z}/{x}/{y}.png?key=WuMlitiPNaB5uEkyEiZc').addTo(map);
  // var marker1 = L.marker([lat, lng]).addTo(map);
  // marker1.bindPopup(popup);

  function onEachFeature(feature, layer) {
      var popupContent = "<p> "+feature.properties.name + "</p>";

      if (feature.properties && feature.properties.popupContent) {
        popupContent += feature.properties.popupContent;
      }

      layer.bindPopup(popupContent);
    };

 L.geoJson(geojson,{onEachFeature: onEachFeature}).addTo(map);

</script>

我尝试了几种找到的编码方法，但找不到使其工作。请帮忙:)

Answer 1

你的geojson是一个字符串，你必须将它解析为一个对象。

var hospitals = JSON.parse(geojson):
L.geoJson(hospitals ,{onEachFeature: onEachFeature}).addTo(map);

更新

要解码 html，您可以使用以下命令:(感谢@ghybs)

function htmlDecode(input) {
  var doc = new DOMParser().parseFromString(input, "text/html");
  return doc.documentElement.textContent;
}
var hospitals = JSON.parse(htmlDecode(geojson)):
L.geoJson(hospitals ,{onEachFeature: onEachFeature}).addTo(map);

https://stackoverflow.com/a/34064434/8283938