--- a/client/src/components/map/Maplayer.vue	Thu Nov 29 13:06:14 2018 +0100
+++ b/client/src/components/map/Maplayer.vue	Thu Nov 29 14:16:16 2018 +0100
@@ -55,7 +55,7 @@
     };
   },
   computed: {
-    ...mapGetters("map", ["getLayerByName"]),
+    ...mapGetters("map", ["getLayerByName", "getVSourceByName"]),
     ...mapState("map", [
       "extent",
       "layers",
@@ -127,9 +127,7 @@
         */
 
         // trying the GetFeatureInfo way for WMS
-        var wmsSource = this.getLayerByName(
-          "Inland ECDIS chart Danube"
-        ).data.getSource();
+        var wmsSource = this.getVSourceByName("Inland ECDIS chart Danube");
         var url = wmsSource.getGetFeatureInfoUrl(
           coordinate,
           100 /* resolution */,
@@ -189,10 +187,11 @@
     },
     updateBottleneckFilter(bottleneck_id, datestr) {
       console.log("updating filter with", bottleneck_id, datestr);
-      var layer = this.getLayerByName("Bottleneck isolines");
-      var wmsSrc = layer.data.getSource();
+      const layer = this.getLayerByName("Bottleneck isolines");
+      const wmsSrc = layer.data.getSource();
+      const exists = bottleneck_id != "does_not_exist";
 
-      if (bottleneck_id != "does_not_exist") {
+      if (exists) {
         wmsSrc.updateParams({
           cql_filter:
             "date_info='" +
@@ -201,12 +200,9 @@
             bottleneck_id +
             "'"
         });
-        layer.isVisible = true;
-        layer.data.setVisible(true);
-      } else {
-        layer.isVisible = false;
-        layer.data.setVisible(false);
       }
+      layer.isVisible = exists;
+      layer.data.setVisible(exists);
     },
     onBeforePrint(/* evt */) {
       // console.log("onBeforePrint(", evt ,")");
@@ -300,11 +296,9 @@
         }
       }
     ).then(response => {
-      var features = new GeoJSON().readFeatures(JSON.stringify(response.data));
-      var vectorSrc = this.getLayerByName(
-        "Fairway Dimensions"
-      ).data.getSource();
-      vectorSrc.addFeatures(features);
+      this.getVSourceByName("Fairway Dimensions").addFeatures(
+        new GeoJSON().readFeatures(JSON.stringify(response.data))
+      );
       // would scale to the extend of all resulting features
       // this.openLayersMap.getView().fit(vectorSrc.getExtent());
     });