fix: Navigating to page wouldn't load previous data

src/app/chart/chart.component.ts

@@ -31,7 +31,7 @@ export class ChartComponent implements OnInit {
   dataConfig: Array<Object> = [];
 
   async ngOnInit() {
-    let data = await this.logsService.getUpdates();
+    let data = await this.logsService.getLogsFirstRun();
     for (const key in data[0]['sensorReadings']) {
       if (data[0]['sensorReadings'].hasOwnProperty(key)) {
         const element = data[0]['sensorReadings'][key];

src/app/logs.service.ts

@@ -23,6 +23,12 @@ export class LogsService {
       .toPromise();
   }
 
+  async getLogsFirstRun(): Promise<Array<Object>> {
+    let data = await this.getLogs();
+    this.previousData = data;
+    return data;
+  }
+
   async getUpdates(): Promise<Array<Object>> {
     let prevData = this.previousData;
     if (!this.previousData) {

src/app/map/map.component.ts

@@ -38,8 +38,16 @@ export class MapComponent implements OnInit {
     // Add map controls
     // this.map.addControl(new mapboxgl.NavigationControl());
 
+    var firstRun: Boolean = true;
+
     this.sub = interval(1000).subscribe(async val => {
-      let data = await this.logsService.getUpdates();
+      let data: Array<Object>;
+      if (firstRun) {
+        data = await this.logsService.getLogsFirstRun();
+        firstRun = false;
+      } else {
+        data = await this.logsService.getUpdates();
+      }
       for (let log of data) {
         if (log['gps_data']['status'] == 'A') {
           let html =