src/components-examples/material/table/table-dynamic-observable-data/table-dynamic-observable-data-example.ts - main - githubmirror/components

src/components-examples/material/table/table-dynamic-observable-data/table-dynamic-observable-data-example.ts

71 строка2 KB

Kristiyan Kostadinov

docs: remove standalone flag from examples

17 окт 2024, 17:40

17 окт 2024, 17:4036f4cca

import {Component} from '@angular/core';
import {DataSource} from '@angular/cdk/collections';
import {Observable, ReplaySubject} from 'rxjs';
import {MatTableModule} from '@angular/material/table';
import {MatButtonModule} from '@angular/material/button';

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

const ELEMENT_DATA: PeriodicElement[] = [
  {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'},
];

/**
 * @title Adding and removing data when using an observable-based datasource.
 */
@Component({
  selector: 'table-dynamic-observable-data-example',
  styleUrl: 'table-dynamic-observable-data-example.css',
  templateUrl: 'table-dynamic-observable-data-example.html',
  imports: [MatButtonModule, MatTableModule],
})
export class TableDynamicObservableDataExample {
  displayedColumns: string[] = ['position', 'name', 'weight', 'symbol'];
  dataToDisplay = [...ELEMENT_DATA];

  dataSource = new ExampleDataSource(this.dataToDisplay);

  addData() {
    const randomElementIndex = Math.floor(Math.random() * ELEMENT_DATA.length);
    this.dataToDisplay = [...this.dataToDisplay, ELEMENT_DATA[randomElementIndex]];
    this.dataSource.setData(this.dataToDisplay);
  }

  removeData() {
    this.dataToDisplay = this.dataToDisplay.slice(0, -1);
    this.dataSource.setData(this.dataToDisplay);
  }
}

class ExampleDataSource extends DataSource<PeriodicElement> {
  private _dataStream = new ReplaySubject<PeriodicElement[]>();

  constructor(initialData: PeriodicElement[]) {
    super();
    this.setData(initialData);
  }

  connect(): Observable<PeriodicElement[]> {
    return this._dataStream;
  }

  disconnect() {}

  setData(data: PeriodicElement[]) {
    this._dataStream.next(data);
  }
}