javascript - 传单，否则 if = 不显示标记

Question

我需要一种方法来在下面的“if and else if”处不显示标记或不可见标记。我有一个不允许在 map 上显示的要素属性值任何建议都会很棒，因为我没有想法

谢谢

pointToLayer: function(feature, latlng) {
    var stt = feature.properties.sid;
    var prd = feature.properties.utl;
    var marker;

    // filter
    if (stt === 162341 && prd === 'A') {
        marker = new L.marker(latlng, {icon: L.AwesomeMarkers.icon({icon: 'th-large', prefix: 'fa', markerColor: 'darkblue'}) });
      } else if (stt === 162341 && prd === 'B') {
        marker = new L.marker(latlng, {icon: L.AwesomeMarkers.icon({icon: 'navicon', prefix: 'fa', markerColor: 'darkblue'}) });
      } else if (stt === 162341 && prd === 'AB') {
        marker = new L.marker(latlng, {icon: L.AwesomeMarkers.icon({icon: 'list', prefix: 'fa', markerColor: 'darkblue'}) });
      } else if (stt === 162341 && prd === 'X') {
        marker = new L.marker(latlng, {icon: L.AwesomeMarkers.icon({icon: 'circle-thin', prefix: 'fa', markerColor: 'darkblue'}) });
      } else {
        marker = show no marker on map with this property value};
      }
    return marker;
    }
}).addTo(map);

Answer 1

您正在使用 pointToLayer，它告诉我您正在使用 L.GeoJson 来解析一些 GeoJSON 并从中创建标记。

让我引用Leaflet documentation关于L.GeoJson的可能选项:

pointToLayer A Function defining how GeoJSON points spawn Leaflet layers. It is internally called when data is added, passing the GeoJSON point feature and its LatLng. The default is to spawn a default Marker

filter A Function that will be used to decide whether to include a feature or not. The default is to include all features

考虑到这一点，显然可以使用两者一个filter函数(对于那些不符合条件的点，它应该返回false)显示)，然后是一个 pointToLayer 函数(它应该实例化未过滤掉的点的 Marker)。