UI for adding rows and columns.

tilorswift/js/Tilorswift.js

@@ -33,13 +33,13 @@ export default class Tilorswift
     {
         if (!terrain.hasEntrancePoint()) {
             alert('Es muss ein Startpunkt definiert sein!');
-            return;
+            return false;
         }
 
         let filename = prompt('Dateiname', 'terrain.json');
 
         if (filename === null) {
-            return;
+            return false;
         }
 
         let json = Tilorswift.getTerrainAsJson(terrain);
@@ -49,5 +49,7 @@ export default class Tilorswift
         download.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(json));
         download.click();
         download.remove();
+
+        return true;
     }
 }