Fix to show custom layer if it is the only one defined

to close #230

CHANGELOG.md

@@ -1,5 +1,6 @@
 ### Change Log for Node-RED Worldmap
 
+ - v2.37.2 - If custom layer is only layer then show it automatically. Issue #230
  - v2.37.1 - Warn (and drop) messages that are missing a payload. Issue #229
  - v2.37.0 - Allow fly instead of fit option when using command to move view window. (PR #225)
  - v2.36.0 - Add edge icons for SIDC markers just off the map.

README.md

@@ -11,6 +11,7 @@ map web page for plotting "things" on.
 
 ### Updates
 
+- v2.37.2 - If custom layer is only layer then show it automatically. Issue #230
 - v2.37.1 - Warn (and drop) messages that are missing a payload. Issue #229
 - v2.37.0 - Allow fly instead of fit option when using command to move view window. (PR #225)
 - v2.36.0 - Add edge icons for SIDC markers just off the map.

package.json

@@ -1,6 +1,6 @@
 {
     "name": "node-red-contrib-web-worldmap",
-    "version": "2.37.1",
+    "version": "2.37.2",
     "description": "A Node-RED node to provide a web page of a world map for plotting things on.",
     "dependencies": {
         "@turf/bezier-spline": "~6.5.0",

worldmap/worldmap.js

@@ -2388,6 +2388,11 @@ function doCommand(cmd) {
         if (!existsalready) {
             layercontrol.addBaseLayer(basemaps[cmd.map.name],cmd.map.name);
         }
+        // if new layer is only layer then show it.
+        if (Object.keys(basemaps).length === 1) {
+            baselayername = cmd.map.name;
+            basemaps[baselayername].addTo(map);
+        }
     }
     // Add or swap new minimap layer
     if (cmd.map && cmd.map.hasOwnProperty("minimap")) {