What is the exact API to get all features in a vector layer in OpenLayers? Suppose I have the "map" object, within which is a "Vector Layer": how can I obtain features in the layer?
As far as I can tell, it's not part of the vector layer api OpenLayers -Vector-js.html.
vector_layer.features should do the trick, though. This is an array maintained by the layer, which saves references to each geometry it contains.
I don't know if you use the Firefox add-on called Firebug, but among other things, it makes interrogating the internals of javascript objects a breeze.
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Just a note, it is part of the API, so layer.features is the right to get at them. dev.openlayers.org/docs/files/OpenLayers/Layer/… – Vadim Nov 10 '11 at 19:52
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Yes, I also noted that. But it seems that the property
featurescan only be obtained fromOpenLayers.Layer.Vector, while the objectmaponly has access toOpenLayer.Layer. The former is inherited from the latter. Then how can I getOpenLayer.Layer.Vector? – ChanDon Nov 11 '11 at 8:16 -
if you use c#or java, you need to do a cast, but here you can use use javascript magic :) if (layer.features) { //do stuff } – D_Guidi Nov 11 '11 at 8:51
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Since
vector_layer.featuresis somewhat internal we ended up extending the Vector layer and override the add method to keep a reference to added features. – Martin Algesten Nov 13 '11 at 10:03
