Pagination using angular with restful API

January 18, 2023February 11, 2023 admin@blogshub.co.in 0 Comments

In this post we will learn how to create pagination using angular, for pagination we will create a new angular application using below steps.

Step 1: Install angular

ng new a_pagination

Get in application

cd a_pagination

Step 2 : Install ngx pagination library

Now we have to install ngx pagination library , that library we will call inside component, Run below command for install pagination library.

npm install ngx-pagination

Step 3: npm start

Now run npm start command

npm start

Step 4: import NgxPaginationModule and HttpClientModule

Now open app module ts and import NgxPaginationModule, HttpClientModule inside it

src\app\app.module.ts

import { NgxPaginationModule } from 'ngx-pagination';
import { HttpClientModule } from '@angular/common/http';

imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule,
    NgxPaginationModule
  ],

Step 5 : Add bootstrap css in index file.

Open index.html file and add bootstrap css.

src\index.html

<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet">

Step 6 : Create Service

We have to create a service for communication with API, using below command we can create a service

ng generate service users

Open the service file and import Httpclient,Observable and create function for calling API

src\app\users.service.ts

import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

getUsers() {
    return this.http.get('https://jsonplaceholder.typicode.com/posts');
  }

Then import the user service inside app component and create function.

src\app\app.component.ts

import { UsersService } from './users.service';

getUsers(){
    this.userservice.getUsers().subscribe(res =>{
      this.USERS = res;
      console.log(this.USERS);
    });
  }

Now go inside component html page and display records

src\app\app.component.html

<div class="container">
<table class="table">
  <thead>
    <th>#</th>
    <th>User Detail</th>

  </thead>
  <tbody>
    <tr *ngFor="let user of USERS">
      <td>{{ user.id }}</td>
      <td>{{ user.title }}</td>
    </tr>
  </tbody>
</table>
</div>

Now create some more function for pagination in component ts file

src\app\app.component.ts

onTableDataChange(e:any){
    this.page = e;
    this.getUsers();
  }

  onSizeChange(e:any){
    this.tableSize = e.target.value;
    this.page = 1;
    this.getUsers();
  }

And now call pagination inside component html page

<tbody>
    <tr *ngFor="let user of USERS | paginate:{itemsPerPage: tableSize, currentPage: page, totalItems: count}; let i index">
      <td>{{ user.id }}</td>
      <td>{{ user.title }}</td>
    </tr>
  </tbody>
</table>

<div>
  <pagination-controls previousLabel="Prev" nextLabel="Next" (pageChange)="onTableDataChange($event)">

Complete Code

src\app\app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';

import { NgxPaginationModule } from 'ngx-pagination';
import { HttpClientModule } from '@angular/common/http';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule,
    NgxPaginationModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

src\index.html

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>APagination</title>
  <base href="/">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" type="image/x-icon" href="favicon.ico">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
  <app-root></app-root>
</body>
</html>

src\app\users.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class UsersService {

  constructor(private http:HttpClient) { }

  getUsers() {
    return this.http.get('https://jsonplaceholder.typicode.com/posts');
  }
}

src\app\app.component.ts

import { Component } from '@angular/core';
import { UsersService } from './users.service';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'a_pagination';
  USERS:any;
  page:number = 1;
  count:number = 0;
  tableSize:number = 10;
  tableSizes:any = [10,15,20,25];

  constructor (private userservice:UsersService){}

  ngOnInit(){
    this.getUsers();
  }

  getUsers(){
    this.userservice.getUsers().subscribe(res =>{
      this.USERS = res;
      console.log(this.USERS);
    });
  }

  onTableDataChange(e:any){
    this.page = e;
    this.getUsers();
  }

  onSizeChange(e:any){
    this.tableSize = e.target.value;
    this.page = 1;
    this.getUsers();
  }

}

src\app\app.component.html

<div class="container " >
<h2>Pagination - Blogshub.co.in</h2>
  <div class="row" >
    <select (change)="onSizeChange($event)" style="width:100px;" >
      <option *ngFor ="let size of tableSizes">
        {{ size }}
      </option>
    </select>
  </div>
  <div class="row" style="margin-top:50px;">
    <table class="table">
      <thead>
        <th>#</th>
        <th>User Detail</th>
    
      </thead>
      <tbody>
        <tr *ngFor="let user of USERS | paginate:{itemsPerPage: tableSize, currentPage: page, totalItems: count}; let i index">
          <td>{{ user.id }}</td>
          <td>{{ user.title }}</td>
        </tr>
      </tbody>
    </table>
    
    <div>
      <pagination-controls previousLabel="Prev" nextLabel="Next" (pageChange)="onTableDataChange($event)">
    
      </pagination-controls>
    </div>
  </div>

</div>

Run Application :

ng serve --open

Keep Learning 🙂

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