Working with layers

1. Working with data layers

The global object josm.layers represents the current layers in josm. The methods and properties of this object are defined in the module josm/layers.

The following scripts prints the names of the currently opened layers:

import josm from 'josm'
import * as console from 'josm/scriptingconsole'
const numLayers = josm.layers.length
for (let i=0; i < numLayers; i++) {
   console.println(`Layer ${i}: name = '${josm.layers.get(i)}'`)
}

Working with data layers

Data layers are instances of the JOSM native class OsmDataLayer. You can open a file with OSM data in a new data layer with the method josm.open():

import josm from 'josm'
// Opens a new data layer for this file
josm.open('/my/data/file.osm')

Alternatively, you can create a data layer for a dataset, in particular for a dataset which has been downloaded from the central OSM server.

import josm from 'josm'
import {Api} from 'josm/api'
const dataset = Api.downloadArea({
      min: {lat: 46.9479186, lon: 7.4619484},
      max: {lat: 46.9497642, lon: 7.4660683}
})
josm.layers.addDataLayer({ds: dataset, name: 'Obstberg'})