@ngx-loading-bar

A fully automatic loading bar with zero configuration for Angular app (http, http-client and router).

---

Packages

• @ngx-loading-bar/router - Display loading bar when navigating between routes.
• @ngx-loading-bar/http-client - Display the progress of your @angular/common/http requests.
• @ngx-loading-bar/core - Core module to manage the progress bar manually.

Demo

• https://aitboudad.github.io/ngx-loading-bar/

Table of contents

• Getting started
  • 1. Install @ngx-loading-bar
  • 2. Import the installed libraries
  • 3. Include ngx-loading-bar in your app component
• Global config
• Ignoring particular requests
• Manage multi loading bars separately
• Manually manage loading service
• Integration with Material Progress bar
• Credits

Getting started

1. Install @ngx-loading-bar:

  # if you use `@angular/common/http`
  npm install @ngx-loading-bar/core @ngx-loading-bar/http-client --save

  # if you use `@angular/router`
  npm install @ngx-loading-bar/core @ngx-loading-bar/router --save

  # to manage loading-bar manually
  npm install @ngx-loading-bar/core --save

Which Version to use?

Angular version	@ngx-loading-bar/core
>=16.0	7.x
>=13.0	6.x
>=9.0	5.x
>=7.0	4.x

2. Import the installed libraries:

// app.config.ts
import { ApplicationConfig, importProvidersFrom } from '@angular/core';

// for HttpClient import:
import { provideHttpClient, withInterceptorsFromDi } from '@angular/common/http';
import { provideLoadingBarInterceptor } from '@ngx-loading-bar/http-client';

// for Router import:
import { provideLoadingBarRouter } from '@ngx-loading-bar/router';

export const appConfig: ApplicationConfig = {
  providers: [
    // for HttpClient use:
    provideHttpClient(withInterceptorsFromDi()),
    provideLoadingBarInterceptor(),

    // for Router use:
    provideLoadingBarRouter(),
  ],
};

3. use ngx-loading-bar in your app component:

import { Component } from '@angular/core';
import { NgxLoadingBar } from '@ngx-loading-bar/core';

@Component({
  selector: 'app',
  imports: [NgxLoadingBar],
  standalone: true,
  template: `
    ...
    <ngx-loading-bar></ngx-loading-bar>
  `,
})
export class AppComponent {}

Customize ngx-loading-bar

You can pass the following inputs to customize the view:

Input	Description
color	The color of loading bar. Default value is #29d.
includeSpinner	Hide or show the Spinner. Default value is true.
includeBar	Hide or show the Bar. Default value is true.
height	The height of loading bar. Default value is 2px.
diameter	The diameter of the progress spinner. Default value is 14px.
fixed	set loading bar on the top of the screen or inside a container. Default value is true.
value	Set the value of the progress bar.
ref	Select the ref of a loading bar instance to display (http, router, ...)

Global config

The global config can be adjusted using provideLoadingBar in the application's config.

import { ApplicationConfig, importProvidersFrom } from '@angular/core';
import { provideLoadingBar } from '@ngx-loading-bar/core';

export const appConfig: ApplicationConfig = {
  providers: [provideLoadingBar({ latencyThreshold: 100 })],
};

Option	Description
latencyThreshold	The initial delay time to wait before displaying the loading bar. Default value is 0.

Ignoring particular requests

The loading bar can also be forced to ignore certain requests, for example, when long-polling or periodically sending debugging information back to the server.

http-client:

// ignore a particular $http GET:
httpClient.get('/status', {
  context: new HttpContext().set(NGX_LOADING_BAR_IGNORED, true),
});

router:

• using the router.navigateByUrl() method:

this.router.navigateByUrl('/custom-path', {
  state: { ignoreLoadingBar: true },
});

• using the routerLink directive:

<a routerLink="/custom-path" [state]="{ ignoreLoadingBar: true }">Go</a>

Manage multi loading bars separately

In some case you may want to differentiate the reason why the loading bar is showing for example show the loading bar when an HttpClient request is being made, and a full page darkening overlay with a spinner when the router is routing to a new page in that case either use ref input or LoadingBarService to control a specific loading bar instance:

• using ref input:

<!-- loading bar for router -->
<ngx-loading-bar ref="router"></ngx-loading-bar>

<!-- loading bar for http -->
<ngx-loading-bar ref="http"></ngx-loading-bar>

• using LoadingBarService service:

// select the router loader instance
const state = this.loader.useRef('router');

// control state
state.start();
state.complete();

// get the progress value
const value$ = state.value$;

Manually manage loading service

import { Component } from '@angular/core';
import { NgxLoadingBar, LoadingBarService } from '@ngx-loading-bar/core';

@Component({
  selector: 'app',
  imports: [NgxLoadingBar],
  standalone: true,
  template: `
    ...
    <ngx-loading-bar></ngx-loading-bar>
    <button (click)="loader.start()">start</button>
    <button (click)="loader.complete()">Complete</button>
  `,
})
export class App {
  loader = this.loadingBar.useRef();
  constructor(private loadingBar: LoadingBarService) {}
}

Integration with Material Progress bar

import { Component } from '@angular/core';
import { LoadingBarService } from '@ngx-loading-bar/core';

@Component({
  selector: 'app',
  template: `
    ...
    <mat-progress-bar mode="determinate" [value]="loader.value$ | async"></mat-progress-bar>
  `,
})
export class App {
  constructor(public loader: LoadingBarService) {}
}

Lazy Loading modules

If you're using Lazy Loaded Modules in your app, please use LoadingBarRouterModule, because although a request is being fired in the nework console to fetch your lazy load module.js file, it won't trigger the LoadingBarHttpClientModule.

Credits

• angular-loading-bar
• https://github.com/sir-valentin/Angular2LoadingBar.git