start of chart component

src/app/app.module.ts

@@ -21,6 +21,7 @@ import { environment } from '../environments/environment';
 import { DashboardComponent } from './dashboard/dashboard.component';
 import { MatCardModule } from '@angular/material/card';
 import { FlexLayoutModule } from '@angular/flex-layout';
+import { DonutChartComponent } from './donut-chart/donut-chart.component';
 
 @NgModule({
   declarations: [
@@ -30,6 +31,7 @@ import { FlexLayoutModule } from '@angular/flex-layout';
     DeviceListComponent,
     StatusToggleComponent,
     DashboardComponent,
+    DonutChartComponent,
   ],
   imports: [
     BrowserModule,

src/app/dashboard/dashboard.component.html

@@ -6,13 +6,17 @@
   <div gdArea="folders">
     <mat-card>
       <mat-card-title>Folders</mat-card-title>
-      <mat-card-content></mat-card-content>
+      <mat-card-content>
+        <app-donut-chart [elementID]="foldersChart"></app-donut-chart>
+      </mat-card-content>
     </mat-card>
   </div>
   <div gdArea="devices">
     <mat-card>
       <mat-card-title>Devices</mat-card-title>
-      <mat-card-content></mat-card-content>
+      <mat-card-content>
+        <app-donut-chart [elementID]="devicesChart"></app-donut-chart>
+      </mat-card-content>
     </mat-card>
   </div>
   <app-status-list gdArea="status-list"></app-status-list>

src/app/dashboard/dashboard.component.ts

@@ -7,6 +7,9 @@ import { SystemConfigService } from '../system-config.service';
   styleUrls: ['./dashboard.component.scss']
 })
 export class DashboardComponent {
+  foldersChart = 'foldersChart';
+  devicesChart = 'devicesChart';
+
   constructor(private systemConfigService: SystemConfigService) { }
 
   ngOnInit() {

src/app/donut-chart/donut-chart.component.html

@@ -0,0 +1 @@
+<canvas id={{elementID}} width="200%" height="100%"></canvas>

src/app/donut-chart/donut-chart.component.spec.ts

@@ -0,0 +1,25 @@
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { DonutChartComponent } from './donut-chart.component';
+
+describe('DonutChartComponent', () => {
+  let component: DonutChartComponent;
+  let fixture: ComponentFixture<DonutChartComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ DonutChartComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(DonutChartComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/donut-chart/donut-chart.component.ts

@@ -0,0 +1,48 @@
+import { Component, OnInit, AfterViewInit, Input } from '@angular/core';
+import { Chart } from 'chart.js'
+import { flatMap } from 'rxjs/operators';
+
+@Component({
+  selector: 'app-donut-chart',
+  templateUrl: './donut-chart.component.html',
+  styleUrls: ['./donut-chart.component.scss']
+})
+export class DonutChartComponent implements OnInit {
+  @Input() elementID: string;
+
+  private canvas: any;
+  private ctx: any;
+
+  constructor() { }
+
+  ngOnInit(): void {
+  }
+
+  ngAfterViewInit(): void {
+    console.log("elementID?", this.elementID)
+    this.canvas = document.getElementById(this.elementID);
+    this.ctx = this.canvas.getContext('2d');
+    const myChart = new Chart(this.ctx, {
+      type: 'doughnut',
+      data: {
+        labels: ["Up to Date", "Syncing", "Waiting to Sync", "Out of Sync", "Failed Items"],
+        datasets: [{
+          data: [1, 2, 3, 0, 0],
+          backgroundColor: [
+            '#56C568',
+            'rgba(54, 162, 235, 1)',
+            'rgba(255, 206, 86, 1)'
+          ],
+          borderWidth: 1
+        }]
+      },
+      options: {
+        responsive: false,
+        display: false,
+        legend: {
+          display: false
+        }
+      }
+    });
+  }
+}

src/app/system-config.service.ts

@@ -24,7 +24,7 @@ export class SystemConfigService {
   private systemConfigUrl = environment.production ? apiURL + 'rest/system/config' : 'api/config';
   private httpOptions;
 
-  private checkInterval: number = 200;
+  private checkInterval: number = 500;
 
   constructor(private http: HttpClient, private cookieService: CookieService) {
     this.httpOptions = { headers: new HttpHeaders(this.cookieService.getCSRFHeader()) };
@@ -52,19 +52,11 @@ export class SystemConfigService {
         observer.next(this.folders);
       } else {
         // create timer to keep checking for folders
-        let check = (): Boolean => {
-          if (this.folders) {
-            observer.next(this.folders);
-            return true;
-          }
-          return false;
-        }
         let t = setInterval(() => {
-          if (check())
+          if (check(this.folders))
             clearInterval(t);
+          observer.next(this.folders);
         }, this.checkInterval);
-
-        check(); // try right away
       }
     });
     return folderObservable;
@@ -75,22 +67,21 @@ export class SystemConfigService {
       if (this.folders) {
         observer.next(this.devices);
       } else {
-        // create timer to keep checking for devices 
-        let check = (): Boolean => {
-          if (this.devices) {
-            observer.next(this.devices);
-            return true;
-          }
-          return false;
-        }
         let t = setInterval(() => {
-          if (check())
+          if (check(this.devices)) {
             clearInterval(t);
+            observer.next(this.devices);
+          }
         }, this.checkInterval);
-
-        check() // try right away
       }
     });
     return deviceObserverable;
   }
+}
+
+const check = (target: any): Boolean => {
+  if (target) {
+    return true;
+  }
+  return false;
 }