How To Add Loader/Spinner In Angular 8 Application

Introduction

 

In this article, we will learn how we can show the Loader in Angular 8 using Ngx spinner library. Ngx spinner is a library for loading spinner for Angular, which is meant to inform the user that data loading is in progress. Basically Loader is used to show the loading state of data in application.

 

Prerequisites

• Basic Knowledge of Angular 2 or higher
• Visual Studio Code
• Visual studio and SQL Server Management studio
• Node and NPM installed
• Bootstrap

Step 1

 

Create an Angular project by using the following command.

ng new Angularloader

Step 2 

 

Open this project in Visual Studio Code and install bootstrap by using following command

npm install bootstrap --save

Now open styles.css file and add Bootstrap file reference. To add reference in styles.css file add this line.

@import '~bootstrap/dist/css/bootstrap.min.css';

Step 3

 

Now install ngx spinner library in this project, to install ngx spinner library use the following command

npm install ngx-spinner --save

Step 4

 

Now Update app.module.ts

 

Open app.module.ts file and add Import NgxSpinnerModule in the root module, 

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { HttpClientModule } from '@angular/common/http'
import { EmployeedetailsComponent } from './employeedetails/employeedetails.component';
import { NgxSpinnerModule } from "ngx-spinner";
@NgModule({
  declarations: [
    AppComponent,
    EmployeedetailsComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule,
    NgxSpinnerModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

 

Step 5

 

Now create a new component by using the following command.

ng g c Employeedetails --spec=false

Now open employeedetails.component.ts file and import NgxSpinnerService 

import { Component, OnInit } from '@angular/core';
import { EmployeeService } from "../employee.service";
import { Employe } from "../employe";
import { NgxSpinnerService } from "ngx-spinner";
@Component({
  selector: 'app-employeedetails',
  templateUrl: './employeedetails.component.html',
  styleUrls: ['./employeedetails.component.css']
})
export class EmployeedetailsComponent implements OnInit {
  emp: any;
  constructor(private employeeService: EmployeeService,
    private SpinnerService: NgxSpinnerService) { }

  ngOnInit() {
    this.GetemployeeDetails();
  }
  GetemployeeDetails() {
    this.SpinnerService.show();
    this.employeeService.GetemployeeDetails().subscribe((data: any) => {
      this.emp = data;
      console.log(this.emp);
       this.SpinnerService.hide();
    });
  }
}

 

Open employeedetails.component.html file and following lines

<div>
    <div class="row" style="margin-top:10px;margin-bottom: 10px;">
      <div class="col-sm-12 btn btn-success">
        Loader in Angular Application with Dynamic  Data
      </div>
    </div>
    <div class="row" style="margin-top:10px;margin-bottom: 10px;">
    </div>
  </div>
  <hr style="background-color:black" />

<div>
    <table class="table table-dark table-striped">
      <thead>
        <tr>
          <th>Id</th>
          <th>Name</th>
          <th>Age</th>
          <th>Address</th>
          <th>City</th>
          <th>ContactNum</th>
          <th>Salary</th>
          <th>Department</th>
        </tr>
      </thead>
      <tbody>
        <tr *ngFor="let e of emp">
          <td>{{e.Id}}</td>
          <td>{{e.Name}}</td>
          <td>{{e.Age}}</td>
          <td>{{e.Address}}</td>
          <td>{{e.City}}</td>
          <td>{{e.ContactNum}}</td>
          <td>{{e.Salary}}</td>
          <td>{{e.Department}}</td>
        </tr>
      </tbody>
    </table>
  </div>
  <ngx-spinner bdColor="rgba(51, 51, 51, 0.8)" size="default" type="ball-spin-clockwise">
    <p style="color: white">Please Wait. </p>
    </ngx-spinner>

Step 6

 

Create a new class using following command,

ng g class  Employe --spec=false

Now open employe.ts file and add the following line in this class

export class Employe {
    Id:number;
    Name:any;
    Age:any;
    Address:any;
    City:any;
    ContactNum:number;
    Salary:number;
    Department:any;
}

Step 7

 

Create a new service using following command

ng g s Employee --spec=false

Now open employee.service.ts file and add following lines

import { Injectable } from '@angular/core';
import { HttpClient } from "@angular/common/http";
@Injectable({
  providedIn: 'root'
})
export class EmployeeService {
  url:any;
  constructor(private http:HttpClient ) {

  }
  GetemployeeDetails()
  {
    this.url='http://localhost:56932/api/Employee/Employeedetails';
    return this.http.get(this.url);
  }
}

Step 8 - Create database and a table 

 

Open SQL Server Management Studio, create a database named "Employee", and in this database, create a table. Give that table a name like "employee".

CREATE TABLE [dbo].[Employee](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [Name] [varchar](50) NULL,
    [Age] [int] NULL,
    [Address] [varchar](50) NULL,
    [City] [varchar](50) NULL,
    [ContactNum] [varchar](50) NULL,
    [Salary] [decimal](18, 0) NULL,
    [Department] [varchar](50) NULL,
 CONSTRAINT [PK_Employee] PRIMARY KEY CLUSTERED
(
    [Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

SET ANSI_PADDING OFF
GO

Create a new Web API project

 

Step 9

 

Open Visual Studio and create a new project.

 

 

Step 10

 

Change the name to LoaderDemo

 

 

Step 11

 

Choose the template as Web API. 

 

 

Step 12

 

Right-click the Models folder from Solution Explorer and go to Add >> New Item >> data.

 

 

Step 13

 

Click on the "ADO.NET Entity Data Model" option and click "Add".

 

 

Step 14

 

Select EF Designer from the database and click the "Next" button.

 

 

Step 15

 

Add the connection properties and select database name on the next page and click OK. 

 

 

Step 16

 

Check the "Table" checkbox. The internal options will be selected by default. Now, click the "Finish" button. 

 

 

Step 17

 

Right-click on the Controllers folder and add a new controller. Name it as "Employee controller" and add the following namespace in the Employee controller. 

using LoaderDemo.Models;

Step 18

 

Now, add a method to fetch data from database.

 

Employee controller 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using LoaderDemo.Models;

namespace LoaderDemo.Controllers
{
    [RoutePrefix("Api/Employee")]
    public class EmployeeController : ApiController
    {
        [Route("Employeedetails")]
        [HttpGet]
        public object Studentdetails()
       {
            EmployeeEntities DB = new EmployeeEntities();
            var emp = DB.Employees.ToList();
            return emp;
        }
    }
}

Step 19

 

Now, let's enable CORS. Go to Tools, open NuGet Package Manager, search for CORS, and install the "Microsoft.Asp.Net.WebApi.Cors" package. Open Webapiconfig.cs and add the following lines.

EnableCorsAttribute cors = new EnableCorsAttribute("*", "*", "*");
config.EnableCors(cors);

Step 20

 

Now run the project and check result

 

 

When data is load, the loader is hidden.

Summary

 

In this article, we learned how we add Loader in Angular application with dynamic data load.