How to implement Bootstrap 4 for Angular 2 ngb-pagination

I was searching for answers to this same question and nobody seems to post a clear answer.

Here's my solution:

ngbPagination with ngFor in Angular 7

export class HomeComponent implements OnInit {


currentPage = 1;
itemsPerPage = 5;
pageSize: number;

constructor() { }

  public onPageChange(pageNum: number): void {
    this.pageSize = this.itemsPerPage*(pageNum - 1);
  }
  
  public changePagesize(num: number): void {
  this.itemsPerPage = this.pageSize + num;
}

}

<div class="container-fluid">
    <div class="col-6 input-group">
        <div class="col-5 input-group-addon">
            <ngb-pagination [collectionSize]="users.length" #numPages [pageSize]="itemsPerPage" [(page)]="currentPage" (pageChange)="onPageChange(currentPage)"></ngb-pagination>
        </div>
        <div class="col-1 input-group-addon">
            <input class="input-sm text-center" type="number" [min]="10" [max]="users.length" step="1" [(ngModel)]="itemsPerPage" (onClick)="changePagesize(pageSize)">
        </div>
    </div>
    <ul *ngIf="users">
        <li *ngFor="let user of users | slice: pageSize | slice: 0:itemsPerPage">
            <img [src]="user.avatar" alt="{{ user.avatar }}">
            <p>{{ user.id }}. {{ user.first_name }} {{ user.last_name }}</p>
        </li>
    </ul>
    <pre><span class="float-md-left">Page: {{ currentPage }} / {{numPages.pageCount}}</span><span class="float-md-right">Found items: {{ itemsPerPage }} / {{ users.length }}</span></pre>
</div>

This solution also applies to Angular 6. I have not tested it on other versions.

For more information, check the documentation. Unfortunatley... it lacks vital information regarding ngFor iteration.

Another problem I had was how to set the number of pages. I decided to add my complete solution for those having the same problem. I found this answer here. Take note of the identifier #numPages above. Here is a live demo on stackblitz

it's my working solution. API for ngb-pagination: https://ng-bootstrap.github.io/#/components/pagination

    ...
</table>
<ngb-pagination [collectionSize]="totalItems" [pageSize]="itemsPerPage" [(page)]="page" [maxSize]="7" [rotate]="true" (pageChange)="loadPage($event)"></ngb-pagination>

In your component you need some like that. Don't forget set your variable in constructor:

  itemsPerPage: number;
  totalItems: any;
  page: any;
  previousPage: any;

  ...
  loadPage(page: number) {
    if (page !== this.previousPage) {
      this.previousPage = page;
      this.loadData();
    }
  }
  ...

  loadData() {
    this.dataService.query({
      page: this.page - 1,
      size: this.itemsPerPage,
    }).subscribe(
      (res: Response) => this.onSuccess(res.json(), res.headers),
      (res: Response) => this.onError(res.json())
      )
  }