Refactor online status tracker.

src/app/_helpers/index.ts

@@ -9,3 +9,4 @@ export * from '@app/_helpers/mock-backend';
 export * from '@app/_helpers/read-csv';
 export * from '@app/_helpers/schema-validation';
 export * from '@app/_helpers/sync';
+export * from '@app/_helpers/online-status';

src/app/_helpers/online-status.ts

@@ -0,0 +1,17 @@
+const apiUrls = [
+  'https://api.coindesk.com/v1/bpi/currentprice.json',
+  'https://dog.ceo/api/breeds/image/random',
+  'https://ipinfo.io/161.185.160.93/geo',
+  'https://randomuser.me/api/',
+];
+
+async function checkOnlineStatus(): Promise<boolean> {
+  try {
+    const online = await fetch(apiUrls[Math.floor(Math.random() * apiUrls.length)]);
+    return online.status >= 200 && online.status < 300;
+  } catch (error) {
+    return false;
+  }
+}
+
+export { checkOnlineStatus };

src/app/shared/network-status/network-status.component.html

@@ -1,6 +1,6 @@
 <nav class="navbar navbar-dark background-dark">
   <h1 class="navbar-brand">
-    <div *ngIf="noInternetConnection; then offlineBlock; else onlineBlock"></div>
+    <div *ngIf="online; then onlineBlock; else offlineBlock"></div>
     <ng-template #offlineBlock>
       <strong style="color: red">OFFLINE </strong>
       <img width="20rem" src="assets/images/no-wifi.svg" alt="Internet Disconnected" />

src/app/shared/network-status/network-status.component.ts

@@ -1,4 +1,5 @@
 import { Component, OnInit, ChangeDetectionStrategy, ChangeDetectorRef } from '@angular/core';
+import { checkOnlineStatus } from '@src/app/_helpers';
 
 @Component({
   selector: 'app-network-status',
@@ -7,21 +8,30 @@ import { Component, OnInit, ChangeDetectionStrategy, ChangeDetectorRef } from '@
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
 export class NetworkStatusComponent implements OnInit {
-  noInternetConnection: boolean = !navigator.onLine;
+  online: boolean = navigator.onLine;
 
   constructor(private cdr: ChangeDetectorRef) {
     this.handleNetworkChange();
   }
 
-  ngOnInit(): void {}
+  ngOnInit(): void {
+    window.addEventListener('online', (event: any) => {
+      this.online = true;
+      this.cdr.detectChanges();
+    });
+    window.addEventListener('offline', (event: any) => {
+      this.online = false;
+      this.cdr.detectChanges();
+    });
+  }
 
   handleNetworkChange(): void {
-    setTimeout(() => {
-      if (!navigator.onLine !== this.noInternetConnection) {
-        this.noInternetConnection = !navigator.onLine;
+    setTimeout(async () => {
+      if (this.online !== (await checkOnlineStatus())) {
+        this.online = await checkOnlineStatus();
         this.cdr.detectChanges();
       }
       this.handleNetworkChange();
-    }, 5000);
+    }, 3000);
   }
 }