How to add the KML layer for Openlayers switcher?

Question

how can i add a KML layer to the switcher by ol-ext Viglino?

When I add:

var vectorSource = new ol.layer.Vector({
  source: new ol.source.Vector({
  url: "IG1.kml",
  format: new ol.format.KML()
})

The layer does not appear on the map.

Answer 1

To appear in the layer switcher the layer must have a title property

var vectorSource = new ol.layer.Vector({
  title: "KML Layer",
  source: new ol.source.Vector({
    url: "IG1.kml",
    format: new ol.format.KML()
  })
})

If the layer is not appearing on the map check that .kml extension is enabled in your server MIME types.