Add support for areas.json geojson hidden property (#364)

* Add support for areas.json geojson hidden property

* Add hidden property to areas.example.json

* Fix lint

Author: versx

static/custom/areas.example.json

@@ -21,7 +21,8 @@
                 "fill-opacity": 0.5, 
                 "stroke": "#352BFF", 
                 "stroke-width": 2.0, 
-                "fill": "#0651FF"
+                "fill": "#0651FF",
+                "hidden": false
             }
         }
     ]

static/js/index.js

@@ -2671,10 +2671,12 @@ function loadScanAreaPolygons () {
     try {
         let areaGeoPolys = L.geoJson(scanAreasDb, {
             onEachFeature: function(features, featureLayer) {
-                let coords = features.geometry.coordinates[0];
-                let areaSize = geodesicArea(coords);
-                let size = convertAreaToSqkm(areaSize).toFixed(2);
-                featureLayer.bindPopup(getScanAreaPopupContent(features.properties.name, size));
+                if (!features.properties.hidden) {
+                    const coords = features.geometry.coordinates[0];
+                    const areaSize = geodesicArea(coords);
+                    const size = convertAreaToSqkm(areaSize).toFixed(2);
+                    featureLayer.bindPopup(getScanAreaPopupContent(features.properties.name, size));
+                }
             }
         });
         scanAreaLayer.addLayer(areaGeoPolys);