如何将Observable数组属性加载为Angular Material Table数据源?

Ore*_*ics 5 observable angular-material angular

我有一个Observable数组属性,其值是从Rest API获取的。

目前,我正在使用ngFor在标准html表中显示数据。

现在,我想切换到Angular Material Table(MatTableDataSource)。如何使用来自Observables的数据加载[dataSource]?

Pre*_*ton 5

干得好。别客气了。我在可称为service.service的服务中具有可观察性,它使用相同的代码来填充所有表。变量位于组件中,并传递给服务:

零件

private dbTable = 'members';  // The table name where the data is.
private dataSource = new MatTableDataSource();

private displayedColumns = [
    'firstName',
    'lastName',
...]

ngAfterViewInit() {
    this.dataSource.paginator = this.paginator;
 }

// ------ GET ALL -----

  private getAllRecords() {
    return this.mainProcessorService.getAllRecords(
      this.dbTable,
      this.dataSource,
      this.paginator,
      );
  }
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处理器服务

  getAllRecords(dbTable, dataSource, paginator) {

    dataSource.paginator = paginator;

    // Populate the Material2 DataTable.
    Observable.merge(paginator.page)
      .startWith(null)  // Delete this and no data is downloaded.
      .switchMap(() => {
        return this.httpService.getRecords(dbTable,
          paginator.pageIndex);
      })
      .map(data => data.resource)  // Get data objects in the Postgres resource JSON object through model.

      .subscribe(data => {
          this.dataLength = data.length;
          dataSource.data = data;
        },
        (err: HttpErrorResponse) => {
          console.log(err.error);
          console.log(err.message);
          this.messagesService.openDialog('Error', 'Database not available.');
        }
      );
  }
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我的html不是ngFor,但应该有用。结果将创建一个需要分页的长表,并可能完成您想要的操作。

<mat-table #table [dataSource]="dataSource" matSort>

        <ng-container matColumnDef="firstName">
          <mat-header-cell fxFlex="10%" *matHeaderCellDef> First Name </mat-header-cell>
          <mat-cell fxFlex="10%" *matCellDef="let row"> {{row.first_name}} </mat-cell>
        </ng-container>


        <ng-container matColumnDef="lastName">
          <mat-header-cell fxFlex="10%" *matHeaderCellDef mat-sort-header> Last Name </mat-header-cell>
          <mat-cell fxFlex="10%" *matCellDef="let row">  {{row.last_name}} </mat-cell>
        </ng-container>
...
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lk_*_*_vc 5

[dataSource]="Observable<ReadOnlyArray>"可以了。提交壮举(表):允许数据输入为数组,流(#9489)似乎在 Angular 5.2 中。目前,允许的类型是DataSource<T> | Observable<ReadonlyArray<T> | T[]> | ReadonlyArray<T> | T[].