OpenLayers => feature is null
OpenLayers => feature is null
这是我的GeoJSON结果。PasteBin但当我加载它时,我在firebug中得到的结果是空的。为什么,我的结果有错误吗?JSON中的坐标是用投影WGS84编写的,在代码中我还将externalProjection设置为WGS84。那么,为什么我得到返回"特性是空的"?我用来管理地图的代码是:
$(document).ready(function() {
var wgs84 = new OpenLayers.Projection('EPSG:4326');
var layer = null;
var map = new OpenLayers.Map('map',{projection: wgs84});
layer = new OpenLayers.Layer.OSM( "Simple OSM Map");
var baseProjection = layer.projection;
map.addLayer(layer);
map.setCenter(new OpenLayers.LonLat(10,10), 4);
map.events.register("moveend", null, function(){
if(map.zoom == 10)
{
var bounds = map.getExtent();
console.log(bounds);
var ne = new OpenLayers.LonLat(bounds.right,bounds.top).transform(map.getProjectionObject(),wgs84);
var sw = new OpenLayers.LonLat(bounds.left,bounds.bottom).transform(map.getProjectionObject(),wgs84);
var vectorLayer = new OpenLayers.Layer.Vector();
map.addLayer(vectorLayer);
$.getJSON('ajax.php?a=markers&type=json&sw=('+sw.lon+','+sw.lat+')&ne=('+ne.lon+','+ne.lat+')',function(data){
//$.getJSON('test.json',function(data){
var geojson_format = new OpenLayers.Format.GeoJSON({
'externalProjection': wgs84,
'internalProjection': baseProjection
});
vectorLayer.addFeatures(geojson_format.read(data));
});
}
});
});
您的示例OpenLayer代码工作正常,问题在于您的GeoJSON:您将坐标拼错为" coordinates "
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