前端處理和後端處理

ngAfterViewInit

  ngAfterViewInit() {
    this.httpClient.get<any>(`https://api.github.com/search/issues?q=repo:angular/material2&page=${this
      .currentPage.pageIndex + 1}`).subscribe(data => {
      this.totalCount = data.items.length;
      this.emailsDataSource.data = data.items;
        
      // no need below line anymore  
      // this.emailsDataSource.paginator = this.paginator;
    });
  }