如何在绑定到 API 响应的 angular 材料表中添加分页

Question

I'm new to angular. In my project shown list of products and its work correctly.

My HTML code is below:

<table mat-table [dataSource]="list_product" style="width: 20%;">
    <!-- id Column -->
    <ng-container matColumnDef="id" style="width: 20%;">
        <th mat-header-cell *matHeaderCellDef style="align-items: center;"> id </th>
        <td mat-cell *matCellDef="let list_product"> {{list_product.id}} </td>
    </ng-container>

    <!-- description Column -->
    <ng-container matColumnDef="description">
        <th mat-header-cell *matHeaderCellDef> Name </th>
        <td mat-cell *matCellDef="let list_product"> {{list_product.description}} </td>
    </ng-container>

    <tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
    <tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>
<mat-paginator [pageSizeOptions]="[5, 10, 20]" showFirstLastButtons></mat-paginator>

and my TypeScript code is -

import { Component, OnInit,ViewChild } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { analyzeAndValidateNgModules } from '@angular/compiler';
import { MatPaginator} from '@angular/material/paginator';
import { MatTableDataSource} from '@angular/material/table';

@Component({
    selector: 'app-basic',
    templateUrl: './basic.component.html',
    styleUrls: ['./basic.component.scss']
})
export class BasicComponent implements OnInit {

    public list_product:any=[];
    displayedColumns: string[] = ['id', 'description'];
    @ViewChild(MatPaginator) paginator: MatPaginator;

    constructor(private http:HttpClient) { }

    ngOnInit(): void {
        this.get_data();
        this.list_product.paginator = this.paginator;
    }

    get_data(){
        this.http.get<any>("http://localhost:3000/listp").subscribe(
            res => this.list_product = res
        )
    }
}

Pagination does not work and all of list are shown. Pagination buttons does not work in html file.

Answer 1

For client side pagination, you can use MatTableDataSource as the data source for your material table. It has pagination, sorting and filtering functionality built-in to it.

Try the following -

1. change list_product to a MatTableDataSource type and initialize it with an empty array -

public list_product = new MatTableDataSource<any>([]);

2. in the get_data() mehod set the data property of the data source -

get_data() {
    this.http.get<any>("http://localhost:3000/listp").subscribe(
        res => this.list_product.data = res
    )
}

3. get a reference of the table's paginator with @ViewChild -

@ViewChild(MatPaginator) private paginator: MatPaginator;

4. implement AfterViewInit and once the view initialized, set the paginator property of the data source -

ngAfterViewInit(): void {
    this.list_product.paginator = this.paginator;
}

Your final component code should look something like -

export class BasicComponent implements OnInit, AfterViewInit {
    
    public list_product = new MatTableDataSource<any>([]);
    displayedColumns: string[] = ['id', 'description'];
    @ViewChild(MatPaginator) private paginator: MatPaginator;

    constructor(private http:HttpClient) { }

    ngOnInit(): void {
        this.get_data();
    }

    get_data(){
        this.http.get<any>("http://localhost:3000/listp").subscribe(
            res => this.list_product.data = res
        );
    }
    
    ngAfterViewInit(): void {
        this.list_product.paginator = this.paginator;
    }
}

You should explore the documentation for further details.