In this tutorial, I will show you how to make Angular 16 Pagination example with existing API (server-side pagination) using ngx-pagination.
Related Posts:
- Angular 16 CRUD example with Rest Api
- Angular 16 Form Validation example (Reactive Forms)
- Angular 16 File upload example with Progress bar
- Angular 16 JWT Authentication example with Web Api
Fullstack with Node.js Express:
Server side Pagination with Node.js and Angular
Fullstack with Spring Boot:
Spring Boot + Angular: Server side Pagination example
Overview of Angular 16 Pagination example
One of the most important things to make a website friendly is the response time, and pagination comes for this reason. For example, this bezkoder.com website has hundreds of tutorials, and we don’t want to see all of them at once. Paging means displaying a small number of all, by a page.
Assume that we have tutorials table in database like this:
Our Angular 16 app will display the result with pagination:
You can change to a page with larger index:
Or change quantity of items per page:
Or paging with filter:
The API for this Angular client can be found at one of following posts:
- Node Express Pagination with MySQL
- Node Express Pagination with PostgreSQL
- Node Express Pagination with MongoDB
- Spring Boot Pagination & Filter example | Spring JPA, Pageable
- Spring Boot MongoDB Pagination example with Spring Data
These Servers will exports API for pagination (with/without filter), here are some url samples:
/api/tutorials?page=1&size=5
-
/api/tutorials?size=5
: using default value for page -
/api/tutorials?page=1
: using default value for size -
/api/tutorials?title=data&page=1&size=3
: pagination & filter by title containing 'data'
This is structure of the response (server-side pagination) for the HTTP GET request:
{
"totalItems": 8,
"tutorials": [...],
"totalPages": 3,
"currentPage": 1
}
This is a kind of server-side paging, where the server sends just a single page at a time. ngx-pagination
supports this scenario, so We actually only need to use tutorials
and totalItems
when working with this library.
ngx-pagination with Angular 16
ngx-pagination provides NgxPaginationModule
for displaying pagination with numbers and responsive style.
There are 2 main things that we're gonna use:
-
PaginatePipe
: placed at the end of anngFor
expression
<your-element *ngFor="let item of collection | paginate: { id: 'foo',
itemsPerPage: pageSize,
currentPage: page,
totalItems: total }">...</your-element>
Use the id
if you need to support more than one instance of pagination at a time.
-
PaginationControlsComponent
: a default component for displaying pagination controls
<pagination-controls></pagination-controls>
For example, this is the default display for simple pagination-controls
above:
We can customize the label displayed on the "previous"/"next" link using previousLabel
/nextLabel
, and enable "responsive" to hide individual page links on small screens.
<pagination-controls
previousLabel="Prev"
nextLabel="Next"
responsive="true"
></pagination-controls>
For handling page changes, we pass handlePageChange
to pageChange
.
Notice that count is totalItems
in the API response, and page
is the current page.
<pagination-controls
(pageChange)="handlePageChange($event)"
></pagination-controls>
<ul>
<li
*ngFor="let tutorial of tutorials | paginate: {
itemsPerPage: pageSize,
currentPage: page,
totalItems: count
}"
>
{{ tutorial.title }}
</li>
</ul>
@Component(...)
export class TutorialsListComponent {
...
page = 1;
handlePageChange(event) {
this.page = event;
}
}
pageChange
is the expression invoked whenever the page changes via a click on the pagination controls. The $event
argument will be the number of the new page.
There are more attributes that ngx-pagination
supports:
<pagination-controls id="some_id"
(pageChange)="pageChanged($event)"
(pageBoundsCorrection)="pageChanged($event)"
maxSize="9"
directionLinks="true"
autoHide="true"
responsive="true"
previousLabel="Previous"
nextLabel="Next"
screenReaderPaginationLabel="Pagination"
screenReaderPageLabel="page"
screenReaderCurrentLabel="You're on page">
</pagination-controls>
You can find the details at: https://www.npmjs.com/package/ngx-pagination.
Technology
- Angular 16
- RxJS 7
- ngx-pagination 6
Setup Angular 16 Pagination Project
Let's open cmd and use Angular CLI to create a new Angular Project as following command:
ng new angular-16-pagination-example
? Would you like to add Angular routing? Yes
? Which stylesheet format would you like to use? CSS
You can follow step by step, or get source code in this post:
Angular 16 CRUD example with Web API
The Angular 16 Project contains structure that we only need to add some changes (in tutorials-list component and tutorial.service.ts) to make the pagination work well.
Or you can get the new Github source code at the end of this tutorial.
Setup ngx-pagination for Angular 16 Pagination example
We need to install ngx-pagination
with command:
npm install ngx-pagination
Then open app.module.ts and import it:
...
import { HttpClientModule } from '@angular/common/http';
import { NgxPaginationModule } from 'ngx-pagination';
@NgModule({
declarations: [ ... ],
imports: [
...
NgxPaginationModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
Create Data Service
This service will use Angular HttpClient to send HTTP requests.
services/tutorial.service.ts
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';
import { Tutorial } from '../models/tutorial.model';
const baseUrl = 'http://localhost:8080/api/tutorials';
@Injectable({
providedIn: 'root'
})
export class TutorialService {
constructor(private http: HttpClient) { }
getAll(params: any): Observable<any> {
return this.http.get<any>(baseUrl, { params });
}
// other CRUD operations
}
In the code above, you can see that we pass params
object to GET method.
The params
object will have one, two or all fields: title
, page
, size
.
Create Angular 16 Component with Pagination
This component has:
- a search bar for finding Tutorials by title.
- a select element for quantity of items per page.
- a
PaginationControlsComponent
component - a tutorials array displayed as a list on the left.
- a selected Tutorial which is shown on the right.
components/tutorials-list/tutorials-list.component.html
<div class="list row">
<div class="col-md-8">
<div class="input-group mb-3">
<input
type="text"
class="form-control"
placeholder="Search by title"
[(ngModel)]="title"
/>
<div class="input-group-append">
<button
class="btn btn-outline-secondary"
type="button"
(click)="searchTitle()"
>
Search
</button>
</div>
</div>
</div>
<div class="col-md-12">
<pagination-controls
previousLabel="Prev"
nextLabel="Next"
[responsive]="true"
(pageChange)="handlePageChange($event)"
></pagination-controls>
</div>
<div class="col-md-6">
<h4>Tutorials List</h4>
<ul class="list-group">
<li
class="list-group-item"
*ngFor="
let tutorial of tutorials | paginate : {
itemsPerPage: pageSize,
currentPage: page,
totalItems: count
};
let i = index
"
...
>
{{ tutorial.title }}
</li>
</ul>
</div>
...
<div class="mt-3">
...
Items per Page:
<select (change)="handlePageSizeChange($event)">
<option *ngFor="let size of pageSizes" [ngValue]="size">
{{ size }}
</option>
</select>
</div>
</div>
We will have following variables:
- search and display Tutorials:
title
tutorials
-
currentTutorial
andcurrentIndex
- pagination:
-
page
: current page -
count
: total pages -
pageSize
: number of items in each page
-
For pagination, we're gonna use TutorialService.getAll()
methods.
components/tutorials-list/tutorials-list.component.ts
import { Component, OnInit } from '@angular/core';
import { Tutorial } from 'src/app/models/tutorial.model';
import { TutorialService } from 'src/app/services/tutorial.service';
@Component({
selector: 'app-tutorials-list',
templateUrl: './tutorials-list.component.html',
styleUrls: ['./tutorials-list.component.css']
})
export class TutorialsListComponent implements OnInit {
tutorials: Tutorial[] = [];
currentTutorial: Tutorial = {};
currentIndex = -1;
title = '';
page = 1;
count = 0;
pageSize = 3;
pageSizes = [3, 6, 9];
constructor(private tutorialService: TutorialService) { }
ngOnInit(): void {
this.retrieveTutorials();
}
getRequestParams(searchTitle: string, page: number, pageSize: number): any {
let params: any = {};
if (searchTitle) {
params[`title`] = searchTitle;
}
if (page) {
params[`page`] = page - 1;
}
if (pageSize) {
params[`size`] = pageSize;
}
return params;
}
retrieveTutorials(): void {
const params = this.getRequestParams(this.title, this.page, this.pageSize);
this.tutorialService.getAll(params)
.subscribe(
response => {
const { tutorials, totalItems } = response;
this.tutorials = tutorials;
this.count = totalItems;
console.log(response);
},
error => {
console.log(error);
});
}
handlePageChange(event: number): void {
this.page = event;
this.retrieveTutorials();
}
handlePageSizeChange(event: any): void {
this.pageSize = event.target.value;
this.page = 1;
this.retrieveTutorials();
}
...
searchTitle(): void {
this.page = 1;
this.retrieveTutorials();
}
}
Let me explain some lines of code.
In the retrieveTutorials()
method:
- We get
title
,page
,pageSize
value and transform them intoparams
object:
{
"title": searchTitle,
"page": page - 1,
"size": pageSize
}
- We use
tutorials
andtotalItems
ascount
value from the response data:
{
"totalItems": 8,
"tutorials": [...],
"totalPages": 3,
"currentPage": 1
}
handlePageChange()
and handlePageSizeChange()
methods are for setting new page
and pageSize
, then we invoke retrieveTutorials()
that updates the tutorials List when pagination information changes.
Run Angular 16 Pagination example
First you need to run the Server at one of following posts:
- Node Express Pagination with MySQL
- Node Express Pagination with PostgreSQL
- Node Express Pagination with MongoDB
- Spring Boot Pagination & Filter example | Spring JPA, Pageable
- Spring Boot MongoDB Pagination example with Spring Data
Then you can run our App with command: ng serve --port 8081
.
If the process is successful, open Browser with Url: http://localhost:8081/
and check it.
Conclusion
Today we've built a Angular 16 Pagination example that consume API (server-side pagination) successfully with ngx-pagination
. I hope you apply it in your project at ease.
Happy learning, see you again!
Source Code
You can find the complete source code for this tutorial on Github.
Further Reading
Fullstack with Node.js Express:
Server side Pagination with Node.js and Angular
Fullstack with Spring Boot:
Spring Boot + Angular: Server side Pagination example
Top comments (1)
great Blog