chore: added click interactivity to receptor fp

chore: added no pr or ar message

src/ui/regionalFeatures/singleFeatures/receptorDensity/receptorDensity/receptorDensity.component.ts

-import { Component, EventEmitter, OnDestroy, Optional } from "@angular/core";
-import { Observable, of, Subscription } from "rxjs";
+import { Component, ElementRef, EventEmitter, HostListener, OnDestroy, Optional } from "@angular/core";
+import { fromEvent, Observable, of, Subscription } from "rxjs";
 import { RegionalFeaturesService } from "src/ui/regionalFeatures/regionalFeature.service";
 import { PureContantService } from "src/util";
 import { RegionFeatureBase } from "../../base/regionFeature.base";
@@ -16,12 +16,18 @@ export class ReceptorDensityFeatureCmp extends RegionFeatureBase implements ISin
   public DS_PREVIEW_URL = DATASET_PREVIEW_URL
   viewChanged: EventEmitter<null> = new EventEmitter()
 
+  private WEB_COMPONENT_MOUSEOVER_EVENT_NAME = 'kg-ds-prv-regional-feature-mouseover'
+  private webComponentOnHover: string = null
+
+  public selectedReceptor: string
+
   public darktheme$: Observable<boolean>
 
   private subs: Subscription[] = []
   public depScriptLoaded$: Observable<boolean>
   constructor(
     regService: RegionalFeaturesService,
+    el: ElementRef,
     @Optional() pureConstantService: PureContantService
   ){
     super(regService)
@@ -31,9 +37,20 @@ export class ReceptorDensityFeatureCmp extends RegionFeatureBase implements ISin
     } else {
       this.darktheme$ = of(false)
     }
+
+    this.subs.push(
+      fromEvent(el.nativeElement, this.WEB_COMPONENT_MOUSEOVER_EVENT_NAME).subscribe((ev: CustomEvent) => {
+        this.webComponentOnHover = ev.detail?.data?.receptor?.label
+      })
+    )
   }
 
-  public selectedReceptor: string
+  @HostListener('click')
+  onClick(){
+    if (this.webComponentOnHover) {
+      this.selectedReceptor = this.webComponentOnHover
+    }
+  }
 
   ngOnDestroy(){
     while(this.subs.length > 0) this.subs.pop().unsubscribe()

src/ui/regionalFeatures/singleFeatures/receptorDensity/receptorDensity/receptorDensity.template.html

@@ -12,18 +12,26 @@
   </ng-container>
 </ng-container>
 
-<mat-form-field class="mt-2 w-100">
-  <mat-label>
-    Select a receptor
-  </mat-label>
-  <mat-select [(value)]="selectedReceptor">
-    <mat-option
-      *ngFor="let receptor of (data$ | async | getAllReceptors)"
-      [value]="receptor">
-      {{ receptor }}
-    </mat-option>
-  </mat-select>
-</mat-form-field>
+<ng-container *ngIf="data$ | async | getAllReceptors as allReceptors; else selectPlaceHolderTmpl">
+
+  <mat-form-field class="mt-2 w-100" *ngIf="allReceptors.length > 0; else selectPlaceHolderTmpl">
+    <mat-label>
+      Select a receptor
+    </mat-label>
+    <mat-select [(value)]="selectedReceptor">
+      <mat-option
+        *ngFor="let receptor of allReceptors"
+        [value]="receptor">
+        {{ receptor }}
+      </mat-option>
+    </mat-select>
+  </mat-form-field>
+
+</ng-container>
+
+<ng-template #selectPlaceHolderTmpl>
+  <span class="text-muted">No profile or autoradiographs available.</span>
+</ng-template>
 
 <ng-template [ngIf]="selectedReceptor">
   <ng-container *ngTemplateOutlet="prArTmpl; context: { filter: '_pr_', label: 'Profile' }">