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ng-loading-bar

v0.0.10

Published

Automatic page loading / progress bar for Angular 2

Downloads

57

Readme

@ngx-loading-bar

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

Packages

Demo

  • online demo: https://angular-sypacw.stackblitz.io
  • demo-app: Example utilizing all @ngx-loading-bar libraries.

Quick Start

1. Install one or all @ngx-loading-bar libraries:

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

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

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

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

2. Import the installed libraries (LoadingBarHttpClientModule, LoadingBarHttpModule, LoadingBarRouterModule or LoadingBarModule):

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

import { LoadingBarHttpClientModule } from '@ngx-loading-bar/http-client';

// for Http import LoadingBarHttpModule:
// import { LoadingBarHttpModule } from '@ngx-loading-bar/http';

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

// for Core import LoadingBarModule:
// import { LoadingBarModule } from '@ngx-loading-bar/core';

import { AppComponent } from './app';

@NgModule({
  ...
  imports: [
    ...

    LoadingBarHttpClientModule

    // for HttpClient use:
    // LoadingBarHttpModule,

    // for Router use:
    // LoadingBarRouterModule

    // for HttpClient use:
    // LoadingBarHttpClientModule

    // for Core use:
    // LoadingBarHttpClientModule.forRoot()
  ],
})
export class AppModule {}

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

import { Component } from '@angular/core';

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

4. include the supplied CSS file (or create your own).

Manually manage loading service

1. Import the LoadingBarModule

import { NgModule } from '@angular/core';

import { LoadingBarModule } from '@ngx-loading-bar/core';

@NgModule({
  ...
  imports: [
    ...

    LoadingBarModule.forRoot(),
  ],
})
export class AppModule {}

2. Inject/Use LoadingBarService

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

@Component({
  selector: 'app',
  template: `
    ...
    <ngx-loading-bar></ngx-loading-bar>
    <button (click)="startLoading()">start</button>
    <button (click)="stopLoading()">stop</button>
  `,
})
export class App {
    constructor(private loadingBar: LoadingBarService) {}

    startLoading() {
        this.loadingBar.start();
    }
    
    stopLoading() {
        this.loadingBar.complete();
    }
}

Advanced

When you import LoadingBarHttpModule, http service observables become hot. That means that a HTTP request is sent as soon as a call to http.get (for example) has been made.


import { Component } from '@angular/core';
import { Http } from '@angular/http';


@Component({
    selector: 'ng-loading-bar-app',
    templateUrl: './app.html',
})
export class App {
    private request$;

    constructor(private _http: Http) {
        // http request is sent here
        this.request$ = _http.get('/app/heroes');
    }

    startLoadingBarHttpRequest() {
        if (false) {
            // Request has been sent to server 
            this.request$.subscribe();
        }
    }
}

This behavior is because the Loading bar module overrides default http service by setting up a subscription to the request. This subscription fires up the HTTP request.

If this behavior doesn't suit you, you should manage loading bar manually as in the component startHttpRequest above.

Credits