fix(wfs-filter): Dont query DescribeFeatureType multiple time for the…

… same layer

Fixes missing attribute names on layer toggle as well

projects/hslayers/components/wfs-filter/wfs-filter.component.ts

@@ -116,7 +116,8 @@ export class HsWfsFilterComponent extends HsPanelBaseComponent {
    */
   async selectLayer(layer: HsLayerDescriptor | null) {
     this.selectedLayer.set(layer);
-    if (!layer) {
+
+    if (!layer || this.setExistingLayerAttributes(layer)) {
       return;
     }
 
@@ -155,6 +156,18 @@ export class HsWfsFilterComponent extends HsPanelBaseComponent {
     this.hsFiltersService.setSelectedLayer(layer);
   }
 
+  /**
+   * Sets the existing layer attributes and returns true if successful, false otherwise
+   */
+  private setExistingLayerAttributes(layer: HsLayerDescriptor): boolean {
+    const layerAttributes = getWfsAttributes(layer.layer);
+    if (layerAttributes) {
+      this.hsFiltersService.setLayerAttributes(layerAttributes);
+      return true;
+    }
+    return false;
+  }
+
   /**
    * Parses the WFS DescribeFeatureType response XML into an array of feature attributes.
    * @param xmlString The XML string response from the WFS DescribeFeatureType request.