Adding back getInstanceByDivId method

src/app/shared/plotly.service.spec.ts

@@ -2,6 +2,7 @@ import { TestBed, inject } from '@angular/core/testing';
 import * as PlotlyJS from 'plotly.js/dist/plotly.js';
 
 import { PlotlyService } from './plotly.service';
+import { Plotly } from './plotly.interface';
 
 describe('PlotlyService', () => {
     beforeEach(() => {
@@ -63,4 +64,15 @@ describe('PlotlyService', () => {
         service.resize('one' as any);
         expect(plotly.Plots.resize).toHaveBeenCalledWith('one');
     }));
+
+
+    it('should get a plotly instance by id', inject([PlotlyService], (service: PlotlyService) => {
+        const instance = { id: 'aidi' } as Plotly.PlotlyHTMLElement;
+
+        PlotlyService.insert(instance);
+        expect(service.getInstanceByDivId('aidi')).toBe(instance);
+
+        PlotlyService.remove(instance);
+        expect(service.getInstanceByDivId('aidi')).toBeUndefined();
+    }));
 });

src/app/shared/plotly.service.ts

@@ -28,6 +28,15 @@ export class PlotlyService {
         }
     }
 
+    public getInstanceByDivId(id: string): Plotly.PlotlyHTMLElement | undefined {
+        for (const instance of PlotlyService.instances) {
+            if (instance.id === id) {
+                return instance;
+            }
+        }
+        return undefined;
+    }
+
     public getPlotly() {
         if (typeof PlotlyService._plotly === 'undefined') {
             throw new Error(`Peer dependency plotly.js isn't installed`);