Getting started

2. Getting started

2.1 Install

Install ngx-ui-loader via NPM, using the command below.

NPM

$ npm install --save ngx-ui-loader

Or Yarn

$ yarn add ngx-ui-loader

* For Angular 4 and 5, please use ngx-ui-loader version 1.2.x

$ npm install --save ngx-ui-loader@1.2.5

2.2 Import NgxUiLoaderModule

Import the NgxUiLoaderModule in your root application module AppModule:

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

import { AppComponent } from './app.component';

import { NgxUiLoaderModule } from  'ngx-ui-loader';

@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    BrowserModule,
    // Import NgxUiLoaderModule
    NgxUiLoaderModule,
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

2.3 Include ngx-ui-loader component

After importing the NgxUiLoaderModule, use ngx-ui-loader component in your root app template:

<ngx-ui-loader></ngx-ui-loader>

See Attributes of NgxUiLoaderComponent for more details about attributes.

2.4 Multiple loaders

You can skip this step if you do not want to use multiple loaders

After importing the NgxUiLoaderModule, use ngx-ui-loader component in your template:

<div style="position: relative"> <!-- the position of the parent container must be set to relative -->
  <!-- It is really important to set loaderId for non-master loader -->
  <ngx-ui-loader [loaderId]="'loader-01'"></ngx-ui-loader>
</div>

<div style="position: relative"> <!-- the position of the parent container must be set to relative -->
  <!-- It is really important to set loaderId for non-master loader -->
  <ngx-ui-loader [loaderId]="'loader-02'"></ngx-ui-loader>
</div>

<ngx-ui-loader></ngx-ui-loader> <!-- this is master loader and its loaderId is "master" by default -->
<!-- Note 1: If you really want to change loaderId of master loader, please use NgxUiLoaderModule.forRoot() method. -->
<!-- Note 2: Your application can only have ONE master loader.
             The master loader should be placed in your app root template, so you can call it anywhere in you app. -->

See simple setup for multiple loaders here on Stackblitz.

Note:

• The application can have only one master loader and many non-master loader.
• The master loader will block the entire viewport.

2.5 Use NgxUiLoaderService service

Add NgxUiLoaderService service wherever you want to use the ngx-ui-loader:

import { Component, OnInit } from '@angular/core';
import { NgxUiLoaderService } from 'ngx-ui-loader'; // Import NgxUiLoaderService

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

  constructor(private ngxService: NgxUiLoaderService) { }

  ngOnInit() {
    this.ngxService.start(); // start foreground spinner of the master loader with 'default' taskId
    // Stop the foreground loading after 5s
    setTimeout(() => {
      this.ngxService.stop(); // stop foreground spinner of the master loader with 'default' taskId
    }, 5000);

    // OR
    this.ngxService.startBackground('do-background-things');
    // Do something here...
    this.ngxService.stopBackground('do-background-things');

    this.ngxService.startLoader('loader-01'); // start foreground spinner of the loader "loader-01" with 'default' taskId
    // Stop the foreground loading after 5s
    setTimeout(() => {
      this.ngxService.stopLoader('loader-01'); // stop foreground spinner of the loader "loader-01" with 'default' taskId
    }, 5000);
  }
}

See API - NgxUiLoaderService for more details.