我用两个基本层构建了一个传单地图,这些基本层中的每一个都有自己独特的兴趣点。兴趣点被存储为geojson,我循环遍历以为不同类别创建多个叠加层。因此,在查看默认基础层时,您将看到“显示全部”,“ Cat1,Cat2等”的层。
我需要一种方法可以将覆盖层附加到基础层,或删除所有覆盖层,然后在基础层发生变化时加载相关的层。
我尝试通过baselayerchange事件使用以下项来切换类别,但是当我切换基础层时仍显示覆盖层。
layerControl._layers.forEach(function(layer){
if(layer.overlay){
map.removeLayer(layer.layer)
}
});
我一直在寻找几天没有任何运气的答案,非常感谢任何帮助。
为上下文发布其他代码。这还不是全部代码,有一些我不包含代码的插件,并且已经排除了几个变量的定义,但这应该可以更好地了解事物的工作方式。
//Initialize the map
var map = new L.Map('map', {
maxZoom: mapMaxZoom,
minZoom: mapMinZoom,
crs: crs1848,
attributionControl: false,
layers: [pano1848]
});
//add controls to the map
var layerControl = L.control.layers(null, null, {position: 'bottomleft'}).addTo(map);
//building category layers from geojson
var types = ['African Americans', 'Art Architecture Culture', 'Education Religion Reform', 'Everyday Life', 'Immigrants', 'Science Inventions', 'Transportation Industry Commerce'];
types.forEach(function(type){
var catType = type.replace(/\s/g,"");
var catPoints = L.geoJson(mapData, {
filter: function(feature, layer){
var cat = feature.properties['category'];
return cat.indexOf(catType) >= 0;
},
onEachFeature: function (feature, layer) {
layer.bindTooltip(feature.properties.name);
(function(layer, properties){
//Create Numeric markers
var numericMarker = L.ExtraMarkers.icon({
icon: 'fa-number',
markerColor: 'yellow',
number: feature.properties['id']
});
layer.setIcon(numericMarker);
layer.on('click', function() {
$.ajax({
url:feature.properties['url'],
dataType:'html',
success: function(result){
$('#detailContainer').html(result);
$('#overlay').fadeIn(300);
}
});
});
})(layer, feature.properties);
}
});
layerControl.addOverlay(catPoints, catType);
});
//Base Layer Change Event
map.on('baselayerchange', function(base){
var layerName;
layerControl._layers.forEach(function(layer){
if(layer.overlay){
map.removeLayer(layer.layer)
}
});
if(base._url.indexOf('1848') >= 0){
map.options.crs = crs1848;
map.fitBounds([
crs1848.unproject(L.point(mapExtent1848[2], mapExtent1848[3])),
crs1848.unproject(L.point(mapExtent1848[0], mapExtent1848[1]))
]);
var southWest = map.unproject([0, 8192], map.getMaxZoom());
var northEast = map.unproject([90112, 0], map.getMaxZoom());
map.setMaxBounds(new L.LatLngBounds(southWest, northEast));
map.addLayer(allPoints);
layerName = '1848 Panorama';
}
else if(base._url.indexOf('2018') >= 0){
map.options.crs = crs2018;
map.fitBounds([
crs2018.unproject(L.point(mapExtent2018[2], mapExtent2018[3])),
crs2018.unproject(L.point(mapExtent2018[0], mapExtent2018[1]))
]);
var southWest = map.unproject([0, 8192], map.getMaxZoom());
var northEast = map.unproject([49152, 0], map.getMaxZoom());
map.setMaxBounds(new L.LatLngBounds(southWest, northEast));
layerName = '2018 Panorama'
}
miniMap.changeLayer(minimapLayers[layerName]);
//map.setView(map.getCenter(), map.getZoom());
});
答案 0 :(得分:1)
您可以创建全局变量并称为“叠加层”,然后像下面的示例一样将其删除。
以下是用于说明您的问题的类似示例 jsFiddle
var overlays = {
'Name 1': catPoints,
'Name 2': catType
};
L.control.layers(null, overlays).addTo(map);
// Whenever you want to remove all overlays:
for (var name in overlays) {
map.removeLayer(overlays[name]);
}