html - 分页在角度 7 中不起作用。(我使用角度 Material )

Question

我需要在客户端实现分页。从后面，我收到以卡片形式带来的待办事项。我决定连接 mat-paginator，但遇到了问题。我把待办事项的数量传给了[length] = "length"，但是翻页把总数拆分成几个部分是行不通的，在不同的页面显示。比如我现在有13个todo(可能还有更多)，我需要在1个页面上显示4个todo。 4 然后是第二个，依此类推。这是我的代码。

component.html

...
<div class="tasks-list" >
    <mat-card class="task-card" *ngFor="let task of tasks">
        <mat-card-header>
            <mat-card-title>
/////////some code////////////
 </mat-card>
</div>

<mat-paginator [length]="length"
          [pageSize]="4"
          [pageSizeOptions]="[4, 8, 12]">
</mat-paginator>

component.ts

@ViewChild(MatPaginator) paginator: MatPaginator;
constructor(private taskService: TaskListService) {}
ngOnInit() { this.getTasks();}

getTasks() {
this.taskService.getTasks()
  .subscribe(
    (data) => {
      this.tasks = data;
      this.length = this.tasks.length;
    }) 
}

我很困惑下一步该怎么做才能让它发挥作用。我到处都主要写如何在表格中打开分页，但我没有表格。如果该行添加 'async'，则它将不起作用。

Answer 1

分页器使用表格数据源。

所有的分页工作都是在迭代器方法中完成的。此方法计算出 skip and take 并将其分配给卡片列表的数据源。

Live Demo

查看:

<div class="tasks-list">
    <mat-card class="task-card" *ngFor="let task of dataSource">
        <mat-card-header>
            <mat-card-title>
        {{task}}
            </mat-card-title>
        </mat-card-header>
    </mat-card>
</div>

<mat-paginator #paginator [pageSize]="pageSize" [pageSizeOptions]="[1, 10, 20]" [showFirstLastButtons]="true" [length]="totalSize"
    [pageIndex]="currentPage" (page)="pageEvent = handlePage($event)">
</mat-paginator>

组件:

export class PaginatorOverviewExample implements OnInit {
  public tasks: any[];

  public dataSource: any;
  public pageSize = 1;
  public currentPage = 0;
  public totalSize = 0;

  @ViewChild(MatPaginator) paginator: MatPaginator;

  ngOnInit() { this.getTasks(); }

  getTasks() {
    // Replace with HTTP call
    var data = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11"];
    this.dataSource = new MatTableDataSource<any>(data);
    this.dataSource.paginator = this.paginator;
    this.tasks = data;
    this.totalSize = this.tasks.length;
    this.iterator(); 
  }

  handlePage(event?: PageEvent) {
    this.currentPage = event.pageIndex;
    this.pageSize = event.pageSize;
    this.iterator();
  }

  private iterator() {
    const end = (this.currentPage + 1) * this.pageSize;
    const start = this.currentPage * this.pageSize;
    const part = this.tasks.slice(start, end);
    this.dataSource = part;
  }
}