Angular 4 Material Design CDK table that is updated every second. It uses trackBy

<!DOCTYPE html>
<html>
<head>
  <title>Angular Material Plunker</title>

  <!-- Load common libraries -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/typescript/2.1.1/typescript.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/2.4.1/core.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/zone.js/0.8.5/zone.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/hammer.js/2.0.8/hammer.min.js"></script>

  <!-- Configure SystemJS -->
  <script src="systemjs.config.js"></script>

  <script>
    System
      .import('main.ts')
      .catch(console.error.bind(console));
  </script>

  <!-- Load the Angular Material stylesheet -->
  <link href="https://unpkg.com/@angular/material/prebuilt-themes/indigo-pink.css" rel="stylesheet">
  <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
  <style>body { font-family: Roboto, Arial, sans-serif; }</style>
</head>

<body>
<table-basic-example>Loading Material Docs example...</table-basic-example>
</body>

</html>


<!-- Copyright 2017 Google Inc. All Rights Reserved.
    Use of this source code is governed by an MIT-style license that
    can be found in the LICENSE file at http://angular.io/license -->

/** Add Transpiler for Typescript */
System.config({
  transpiler: 'typescript',
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  packages: {
    '.': {
      defaultExtension: 'ts'
    },
    'vendor': {
      defaultExtension: 'js'
    }
  }
});

System.config({
  map: {
    'main': 'main.js',

    // Angular specific mappings.
    '@angular/core': 'https://unpkg.com/@angular/core/bundles/core.umd.js',
    '@angular/animations': 'https://unpkg.com/@angular/animations/bundles/animations.umd.js',
    '@angular/common': 'https://unpkg.com/@angular/common/bundles/common.umd.js',
    '@angular/compiler': 'https://unpkg.com/@angular/compiler/bundles/compiler.umd.js',
    '@angular/http': 'https://unpkg.com/@angular/http/bundles/http.umd.js',
    '@angular/forms': 'https://unpkg.com/@angular/forms/bundles/forms.umd.js',
    '@angular/router': 'https://unpkg.com/@angular/router/bundles/router.umd.js',
    '@angular/platform-browser': 'https://unpkg.com/@angular/platform-browser/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'https://unpkg.com/@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
    '@angular/animations/browser': 'https://unpkg.com/@angular/animations/bundles/animations-browser.umd.js',
    '@angular/platform-browser/animations': 'https://unpkg.com/@angular/platform-browser/bundles/platform-browser-animations.umd.js',
    '@angular/material': 'https://unpkg.com/@angular/material/bundles/material.umd.js',
    '@angular/cdk': 'https://unpkg.com/@angular/cdk/bundles/cdk.umd.js',
    '@angular/cdk/a11y': 'https://unpkg.com/@angular/cdk/bundles/cdk-a11y.umd.js',
    '@angular/cdk/bidi': 'https://unpkg.com/@angular/cdk/bundles/cdk-bidi.umd.js',
    '@angular/cdk/coercion': 'https://unpkg.com/@angular/cdk/bundles/cdk-coercion.umd.js',
    '@angular/cdk/collections': 'https://unpkg.com/@angular/cdk/bundles/cdk-collections.umd.js',
    '@angular/cdk/keycodes': 'https://unpkg.com/@angular/cdk/bundles/cdk-keycodes.umd.js',
    '@angular/cdk/observers': 'https://unpkg.com/@angular/cdk/bundles/cdk-observers.umd.js',
    '@angular/cdk/overlay': 'https://unpkg.com/@angular/cdk/bundles/cdk-overlay.umd.js',
    '@angular/cdk/platform': 'https://unpkg.com/@angular/cdk/bundles/cdk-platform.umd.js',
    '@angular/cdk/portal': 'https://unpkg.com/@angular/cdk/bundles/cdk-portal.umd.js',
    '@angular/cdk/rxjs': 'https://unpkg.com/@angular/cdk/bundles/cdk-rxjs.umd.js',
    '@angular/cdk/scrolling': 'https://unpkg.com/@angular/cdk/bundles/cdk-scrolling.umd.js',
    '@angular/cdk/table': 'https://unpkg.com/@angular/cdk/bundles/cdk-table.umd.js',
    '@angular/cdk/stepper': 'https://unpkg.com/@angular/cdk/bundles/cdk-stepper.umd.js',

    // Rxjs mapping
    'rxjs': 'https://unpkg.com/rxjs',
    //'rxjs': 'npm:rxjs',
  },
  packages: {
    // Thirdparty barrels.
    'rxjs': { main: 'index' },
  }
});

import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {BrowserModule} from '@angular/platform-browser';
import {BrowserAnimationsModule} from '@angular/platform-browser/animations';
import {NgModule} from '@angular/core';
import {FormsModule, ReactiveFormsModule} from '@angular/forms';
import {
  MatAutocompleteModule,
  MatButtonModule,
  MatButtonToggleModule,
  MatCardModule,
  MatCheckboxModule,
  MatChipsModule,
  MatDatepickerModule,
  MatDialogModule,
  MatExpansionModule,
  MatGridListModule,
  MatIconModule,
  MatInputModule,
  MatListModule,
  MatMenuModule,
  MatNativeDateModule,
  MatPaginatorModule,
  MatProgressBarModule,
  MatProgressSpinnerModule,
  MatRadioModule,
  MatRippleModule,
  MatSelectModule,
  MatSidenavModule,
  MatSliderModule,
  MatSlideToggleModule,
  MatSnackBarModule,
  MatSortModule,
  MatTableModule,
  MatTabsModule,
  MatToolbarModule,
  MatTooltipModule,
  MatStepperModule,
} from '@angular/material';
import {TableBasicExample} from './table-basic-example';
import {HttpModule} from '@angular/http';
import {CdkTableModule} from '@angular/cdk/table';

@NgModule({
  exports: [
    CdkTableModule,
    MatAutocompleteModule,
    MatButtonModule,
    MatButtonToggleModule,
    MatCardModule,
    MatCheckboxModule,
    MatChipsModule,
    MatStepperModule,
    MatDatepickerModule,
    MatDialogModule,
    MatExpansionModule,
    MatGridListModule,
    MatIconModule,
    MatInputModule,
    MatListModule,
    MatMenuModule,
    MatNativeDateModule,
    MatPaginatorModule,
    MatProgressBarModule,
    MatProgressSpinnerModule,
    MatRadioModule,
    MatRippleModule,
    MatSelectModule,
    MatSidenavModule,
    MatSliderModule,
    MatSlideToggleModule,
    MatSnackBarModule,
    MatSortModule,
    MatTableModule,
    MatTabsModule,
    MatToolbarModule,
    MatTooltipModule,
  ]
})
export class PlunkerMaterialModule {}

@NgModule({

  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    FormsModule,
    HttpModule,
    PlunkerMaterialModule,
    MatNativeDateModule,
    ReactiveFormsModule,
  ],

  declarations: [TableBasicExample],
  bootstrap: [TableBasicExample],
  providers: []
})
export class PlunkerAppModule {}

platformBrowserDynamic().bootstrapModule(PlunkerAppModule);


/**  Copyright 2017 Google Inc. All Rights Reserved.
    Use of this source code is governed by an MIT-style license that
    can be found in the LICENSE file at http://angular.io/license */

<div class="example-container mat-elevation-z8">
  <mat-table #table [dataSource]="dataSource" [trackBy]="trackById">

    <!--- Note that these columns can be defined in any order.
          The actual rendered columns are set as a property on the row definition" -->

    <!-- Position Column -->
    <ng-container matColumnDef="position">
      <mat-header-cell *matHeaderCellDef> No. </mat-header-cell>
      <mat-cell *matCellDef="let element"> {{element.position}} </mat-cell>
    </ng-container>

    <!-- Name Column -->
    <ng-container matColumnDef="name">
      <mat-header-cell *matHeaderCellDef> Name </mat-header-cell>
      <mat-cell *matCellDef="let element"> {{element.name}} </mat-cell>
    </ng-container>

    <!-- Weight Column -->
    <ng-container matColumnDef="weight">
      <mat-header-cell *matHeaderCellDef> Weight </mat-header-cell>
      <mat-cell *matCellDef="let element"> {{element.weight}} </mat-cell>
    </ng-container>

    <!-- Color Column -->
    <ng-container matColumnDef="symbol">
      <mat-header-cell *matHeaderCellDef> Symbol </mat-header-cell>
      <mat-cell *matCellDef="let element"> {{element.symbol}} </mat-cell>
    </ng-container>

    <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
    <mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>
  </mat-table>
</div>


<!-- Copyright 2017 Google Inc. All Rights Reserved.
    Use of this source code is governed by an MIT-style license that
    can be found in the LICENSE file at http://angular.io/license -->

import {Component} from '@angular/core';
import {DataSource} from '@angular/cdk/collections';
import {Observable} from 'rxjs/Observable';
import {BehaviorSubject} from 'rxjs/BehaviorSubject';
import 'rxjs/add/operator/map';
import 'rxjs/add/observable/of';
import 'rxjs/add/observable/timer';

/**
 * @title Basic table
 */
@Component({
  selector: 'table-basic-example',
  styleUrls: ['table-basic-example.css'],
  templateUrl: 'table-basic-example.html',
})
export class TableBasicExample {
  displayedColumns = ['position', 'name', 'weight', 'symbol'];
  dataSource = new ExampleDataSource();
}

export interface Element {
  name: string;
  position: number;
  weight: number;
  symbol: string;
}

const data: Element[] = [
  {position: 1, name: 'Hydrogen', weight: 1.0079, symbol: 'H'},
  {position: 2, name: 'Helium', weight: 4.0026, symbol: 'He'},
  {position: 3, name: 'Lithium', weight: 6.941, symbol: 'Li'},
  {position: 4, name: 'Beryllium', weight: 9.0122, symbol: 'Be'},
  {position: 5, name: 'Boron', weight: 10.811, symbol: 'B'},
  {position: 6, name: 'Carbon', weight: 12.0107, symbol: 'C'},
  {position: 7, name: 'Nitrogen', weight: 14.0067, symbol: 'N'},
  {position: 8, name: 'Oxygen', weight: 15.9994, symbol: 'O'},
  {position: 9, name: 'Fluorine', weight: 18.9984, symbol: 'F'},
  {position: 10, name: 'Neon', weight: 20.1797, symbol: 'Ne'},
  {position: 11, name: 'Sodium', weight: 22.9897, symbol: 'Na'},
  {position: 12, name: 'Magnesium', weight: 24.305, symbol: 'Mg'},
  {position: 13, name: 'Aluminum', weight: 26.9815, symbol: 'Al'},
  {position: 14, name: 'Silicon', weight: 28.0855, symbol: 'Si'},
  {position: 15, name: 'Phosphorus', weight: 30.9738, symbol: 'P'},
  {position: 16, name: 'Sulfur', weight: 32.065, symbol: 'S'},
  {position: 17, name: 'Chlorine', weight: 35.453, symbol: 'Cl'},
  {position: 18, name: 'Argon', weight: 39.948, symbol: 'Ar'},
  {position: 19, name: 'Potassium', weight: 39.0983, symbol: 'K'},
  {position: 20, name: 'Calcium', weight: 40.078, symbol: 'Ca'},
];

/**
 * Data source to provide what data should be rendered in the table. The observable provided
 * in connect should emit exactly the data that should be rendered by the table. If the data is
 * altered, the observable should emit that new set of data on the stream. In our case here,
 * we return a stream that contains only one set of data that doesn't change.
 */
export class ExampleDataSource extends DataSource<any> {
  dataS: BehaviorSubject<object[]>;
  dataO: Observable<object[]>;
  constructor() {
    super();
    this.dataS = new BehaviorSubject([]);
    this.dataO = this.dataS.asObservable();
    
    Observable
      .timer(0, 1000)
      .map((tick) => {
        data.forEach((value, index) => {
          value.weight = 'weight -- ' + Date.now() ;
          console.log(value);
        });
        return data;
      })
      .subscribe(this.dataS);
    
  }
  
  trackById(index, item) 
  {
    return item.position;
  }
  
  /** Connect function called by the table to retrieve one stream containing the data to render. */
  connect(): Observable<Element[]> {
    return this.dataO;
  }

  disconnect() {}
}


/**  Copyright 2017 Google Inc. All Rights Reserved.
    Use of this source code is governed by an MIT-style license that
    can be found in the LICENSE file at http://angular.io/license */

.example-container {
  display: flex;
  flex-direction: column;
  max-height: 500px;
  min-width: 300px;
}

.mat-table {
  overflow: auto;
  max-height: 500px;
}