[英]Array of GeoJSON layers vs PanelLayers: Layer undefined
我从运行此代码得到了一系列GeoJSON图层:
var myURL = [ "url1", "url2", "url3" ];
for (var i = 0; i < myURL.length; i++) {
var scenario_json = [];
$.getJSON(myURL[i], function (data) {
var layer= new L.GeoJSON(data);
scenario_json.push(layer);
});
};
我想将此数组与Leaflet Addon Panel Layers一起使用 。 我想调用数组中存储的每个GeoJSON图层,并将它们添加到面板中的一组图层中。 这是我的代码:
osmLayer = new L.TileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png');
esriLayer = new L.tileLayer('http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}', {
attribution: 'Tiles © Esri — Source: Esri, i-cubed, USDA, USGS, AEX, GeoEye, Getmapping, Aerogrid, IGN, IGP, UPR-EGP, and the GIS User Community',
maxZoom: 17
});
var baseLayers = [
{
name: "OpenStreetMap",
layer: osmLayer
},
{
name: "Esri World Imagery",
layer: esriLayer
}
];
var overLayers = [
{
group: "Modelisation results",
layers: [
{
name: "Scenario 1",
icon: '<i class="icon icon-modelisation"></i>',
layer: scenario_json[1]
},
{
name: "Scenario 2",
icon: '<i class="icon icon-modelisation"></i>',
layer: scenario_json[2]
},
{
name: "Scenario 3",
icon: '<i class="icon icon-modelisation"></i>',
layer: scenario_json[3]
}
]
}
];
var panelLayers = new L.Control.PanelLayers(baseLayers, overLayers);
var map = L.map('map').setView([48.42432,-71.16237], 14);
map.addLayer(osmLayer);
map.addControl(panelLayers);
如果我放L.tilelayer.WMS
变量而不是L.tilelayer.WMS
scenario_json[x]
,它可以正常工作,但是我无法使它与数组一起使用,我一直在获取scenario_json is not defined
L.tilelayer.WMS
。
有人有解决方案吗?
我建议您将所有映射初始化代码包装到一个函数中,并在收到所有getJSON
响应时调用它。 就像是:
function initMap(scenario_json) {
osmLayer = new L.TileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png');
esriLayer = new L.tileLayer('http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}', {
attribution: 'Tiles © Esri — Source: Esri, i-cubed, USDA, USGS, AEX, GeoEye, Getmapping, Aerogrid, IGN, IGP, UPR-EGP, and the GIS User Community',
maxZoom: 17
});
var baseLayers = [
{
name: "OpenStreetMap",
layer: osmLayer
},
{
name: "Esri World Imagery",
layer: esriLayer
}
];
var overLayers = [
{
group: "Modelisation results",
layers: [
{
name: "Scenario 1",
icon: '<i class="icon icon-modelisation"></i>',
layer: scenario_json[1]
},
{
name: "Scenario 2",
icon: '<i class="icon icon-modelisation"></i>',
layer: scenario_json[2]
},
{
name: "Scenario 3",
icon: '<i class="icon icon-modelisation"></i>',
layer: scenario_json[3]
}
]
}
];
}
var myURL = [ "url1", "url2", "url3" ];
var scenario_json = [];
for (var i = 0; i < myURL.length; i++) {
$.getJSON(myURL[i], function (data) {
var layer= new L.GeoJSON(data);
scenario_json.push(layer);
if(scenario_json.length == myURL.length) {
initMap(scenario_json);
}
});
};
或者,您可以在jQuery.when()
方法的帮助下链接您的诺言:
$.when( $.ajax(myURL[1]), $.ajax(myURL[2]), $.ajax(myURL[3]) )
.done(function(first, second, third){
//collect scenario_json
//init map
})
.fail(function(){
//handle the error
});
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