[英]OpenLayers after load can't draw
我做了绘制和保存到GeoJson的功能。 然后我得到了: 保存结果
接下来,当我加载要素时可以按时进行绘制,但出现错误:“ layer.getSource()。getFeaturesCollection()” == null,但是我使用FeatureCollection类型保存了特征。 当我使用getFeatures()时,它返回功能数组
加载层的开始:
if(map_info != "") {
var layer_area = new ol.layer.Vector({
source: new ol.source.Vector({
features: (new ol.format.GeoJSON()).readFeatures(map_info['layers'][0])
}),
});
var layer_branch = new ol.layer.Vector({
source: new ol.source.Vector({ features: (new ol.format.GeoJSON()).readFeatures(map_info['layers'][1]) })
});
var layer_region = new ol.layer.Vector({
source: new ol.source.Vector({ features: (new ol.format.GeoJSON()).readFeatures(map_info['layers'][2]) })
});
var layer_ambon = new ol.layer.Vector({
source: new ol.source.Vector({ features: (new ol.format.GeoJSON()).readFeatures(map_info['layers'][3]) })
});
var view=new ol.View({
center: [{{map.pos_x}}, {{map.pos_y}}],
zoom: {{map.zoom}}
});
}else {
var layer_area = new ol.layer.Vector({
source: new ol.source.Vector({ features: new ol.Collection() })
});
var layer_branch = new ol.layer.Vector({
source: new ol.source.Vector({ features: new ol.Collection() })
});
var layer_region = new ol.layer.Vector({
source: new ol.source.Vector({ features: new ol.Collection() })
});
var layer_ambon = new ol.layer.Vector({
source: new ol.source.Vector({ features: new ol.Collection() })
});
var view=new ol.View({
center: [2097096.387839827, 6887410.172738342],
zoom: 5
});
}
绘图功能:
$("#draw_ambon").on("click", function(){
var layer=manager["ambon"];
map.removeInteraction(draw);
select !== null ? map.removeInteraction(select) : 0;
setInteraction(layer.getSource().getFeaturesCollection(), "Point");
layer.setStyle(pointStyleFunction);
layer.setMap(map);
draw.on("drawend", function(e){
layer.getSource().addFeatures(e.feature);
e.feature.setProperties({
'id': layer.getSource().getFeaturesCollection().getLength(),
'type': "ambona",
'name': ''
})
})
});
我解决了 只需将clas ol.Collection添加到源代码中的features选项:
source: new ol.source.Vector({ features: new ol.Collection(new ol.format.GeoJSON()).readFeatures(map_info['layers'][1])) })
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