Remove/Delete a layer or layergroup with mouse click

Question

I add a ol.layer.Vector OR ol.layer.Group with a mouse click in the map. By a new mouse click should the layer removed/deleted AND a new layer should be add. etc.

I have search and search and don't found a simple methode. There is all complicated or don't work, or with Ajax or JQuery (i don't use it).

Then i use this and that is the best solution:

if (map.getLayers().array_.length > 1) {
map.getLayers().array_.pop();
}

That works absolutelly perfect and is absolutelly simple. OpenLayers does not seem to have such a simple solution.

Answer 1

Properties ending with underscore are usually only available in debug builds of OpenLayers. getArray() returns an OpenLayers collection which has getLength() and pop() methods.

if (map.getLayers().getLength() > 1) {
  map.getLayers().pop();
}

Answer 2

I have found it myself. There is a getArray().

if (map.getLayers().getArray().length > 1) {
map.getLayers().getArray().pop();
}