How to use paginator from material angular?

I'm new to angular and trying to implement pagination in my app. I am trying to use this material component.

With the code below, I can get length, pagesize, and pageSizeOptions in my .ts file

<md-paginator [length]="length"
              [pageSize]="pageSize"
              [pageSizeOptions]="pageSizeOptions"
</md-paginator>

export class PaginatorConfigurableExample {

  length = 100;
  pageSize = 10;
  pageSizeOptions = [5, 10, 25, 100];

  }
}

but I can't seem to trigger a function to change the data on the table above when the page is changed. Also, how do I use the nextPage, previousPage, hasNextPage, and hasPreviousPage methods?

Solution 1:

I'm struggling with the same here. But I can show you what I've got doing some research. Basically, you first start adding the page @Output event in the foo.template.ts:

 <md-paginator #paginator
                [length]="length"
                [pageIndex]="pageIndex"
                [pageSize]="pageSize"
                [pageSizeOptions]="[5, 10, 25, 100]"
                (page)="pageEvent = getServerData($event)"
                >
 </md-paginator>

And later, you have to add the pageEvent attribute in the foo.component.ts class and the others to handle paginator requirements:

pageEvent: PageEvent;
datasource: null;
pageIndex:number;
pageSize:number;
length:number;

And add the method that will fetch the server data:

ngOnInit() {
   getServerData(null) ...
}

public getServerData(event?:PageEvent){
  this.fooService.getdata(event).subscribe(
    response =>{
      if(response.error) {
        // handle error
      } else {
        this.datasource = response.data;
        this.pageIndex = response.pageIndex;
        this.pageSize = response.pageSize;
        this.length = response.length;
      }
    },
    error =>{
      // handle error
    }
  );
  return event;
}

So, basically, every time you click the paginator, you'll activate getServerData(..) method that will call foo.service.ts getting all data required. In this case, you do not need to handle nextPage and nextXXX events because they will be automatically calculated upon view rendering.

I hope this can help you. Let me know if you had success. =]

Solution 2:

Hey so I stumbled upon this and got it working, here is how:

inside my component.html

<mat-paginator #paginator [pageSize]="pageSize" [pageSizeOptions]="[5, 10, 20]" [showFirstLastButtons]="true" [length]="totalSize"
    [pageIndex]="currentPage" (page)="pageEvent = handlePage($event)">
</mat-paginator>

Inside my component.ts

public array: any;
public displayedColumns = ['', '', '', '', ''];
public dataSource: any;    

public pageSize = 10;
public currentPage = 0;
public totalSize = 0;

@ViewChild(MatPaginator) paginator: MatPaginator;

constructor(private app: AppService) { }

ngOnInit() {
  this.getArray();
}

public handlePage(e: any) {
  this.currentPage = e.pageIndex;
  this.pageSize = e.pageSize;
  this.iterator();
}

private getArray() {
  this.app.getDeliveries()
    .subscribe((response) => {
      this.dataSource = new MatTableDataSource<Element>(response);
      this.dataSource.paginator = this.paginator;
      this.array = response;
      this.totalSize = this.array.length;
      this.iterator();
    });
}

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

All the paging work is done from within the iterator method. This method works out the skip and take and assigns that to the dataSource for the Material table.

Solution 3:

based on Wesley Coetzee's answer i wrote this. Hope it can help anyone googling this issue. I had bugs with swapping the paginator size in the middle of the list that's why i submit my answer:

Paginator html and list

<mat-paginator [length]="localNewspapers.length" pageSize=20
               (page)="getPaginatorData($event)" [pageSizeOptions]="[10, 20, 30]"
               showFirstLastButtons="false">
</mat-paginator>
<mat-list>
   <app-newspaper-pagi-item *ngFor="let paper of (localNewspapers | 
                         slice: lowValue : highValue)"
                         [newspaper]="paper"> 
  </app-newspaper-pagi-item>

Component logic

import {Component, Input, OnInit} from "@angular/core";
import {PageEvent} from "@angular/material";

@Component({
  selector: 'app-uniques-newspaper-list',
  templateUrl: './newspaper-uniques-list.component.html',
})
export class NewspaperUniquesListComponent implements OnInit {
  lowValue: number = 0;
  highValue: number = 20;

  // used to build a slice of papers relevant at any given time
  public getPaginatorData(event: PageEvent): PageEvent {
    this.lowValue = event.pageIndex * event.pageSize;
    this.highValue = this.lowValue + event.pageSize;
    return event;
  }

}

Solution 4:

Another way to link Angular Paginator with the data table using Slice Pipe.Here data is fetched only once from server.

View:

 <div class="col-md-3" *ngFor="let productObj of productListData | 
     slice: lowValue : highValue">
       //actual data dispaly  
 </div>

<mat-paginator [length]="productListData.length" [pageSize]="pageSize" 
   (page)="pageEvent = getPaginatorData($event)">
</mat-paginator> 

Component

    pageIndex:number = 0;
    pageSize:number = 50;
    lowValue:number = 0;
    highValue:number = 50;       

  getPaginatorData(event){
     console.log(event);
     if(event.pageIndex === this.pageIndex + 1){
        this.lowValue = this.lowValue + this.pageSize;
        this.highValue =  this.highValue + this.pageSize;
       }
    else if(event.pageIndex === this.pageIndex - 1){
       this.lowValue = this.lowValue - this.pageSize;
       this.highValue =  this.highValue - this.pageSize;
      }   
       this.pageIndex = event.pageIndex;
 }