How To Upload Multiple Images Using Angular 7

Introduction 

 

In this article, I am going to explain how to upload multiple images using angular 7 and Web API. I am also creating a demo project for  better understanding. This article will help beginners who are getting started with Angular.

 

Prerequisites

• Angular 7
• Web API
• SQL Server
• HTML/Bootstrap 

Steps required

1. Create a database and 2 tables in SQL Server
2. Create a Web API using ASP.NET Web API
3. Create a new project in Angular 7

For this article, I have created a database and two tables. For creating the database, we follow the following steps.

 

Step 1

 

Let's open SSMS (SQL Server Management Studio).

 

 

  

Step 2

 

Connect to the SSMS.

 

 

Step 3

 

I have created the database using the following query. 

create database db_multipleimage

Step 4

 

I have created an Imagemaster table. 

CREATE TABLE [dbo].[imagemaster](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [ImageName] [varchar](50) NULL,
    [Remark] [varchar](50) NULL,
 CONSTRAINT [PK_imagemaster] 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]

Now, the database looks like below.

 

 

I have created a Web API using ASP.NET Web API. For creating the Web API, we need to follow the following steps.

 

Step 1

 

Open Visual Studio 2017 and go to File > New > Project.

 

 

 

Step 2

 

Select Web >> ASP.NET Web Application.

 

 

Step 3

 

Then, select Web API and click OK.

 

 

Step 4

 

Now, create a new Controller named FileUploadController.

 

 

 

Step 5

 

Now, import the database using Entity Framework.

 

 

Step 6

 

Now, create a method (UploadFiles) for inserting images in the table and save images in a folder in FileUploadController.

[HttpPost()]
       public string UploadFiles()
       {
           string sPath = "";
           sPath = System.Web.Hosting.HostingEnvironment.MapPath("~/image/");
           var request = System.Web.HttpContext.Current.Request;
           System.Web.HttpFileCollection hfc = System.Web.HttpContext.Current.Request.Files;
           var remark = request["remark"].ToString();
           for (int iCnt = 0; iCnt <= hfc.Count - 1; iCnt++)
           {
               System.Web.HttpPostedFile hpf = hfc[iCnt];
               if (hpf.ContentLength > 0)
               {
                   string FileName = (Path.GetFileName(hpf.FileName));
                   if (!File.Exists(sPath + FileName))
                   {
                       // SAVE THE FILES IN THE FOLDER.
                       hpf.SaveAs(sPath + FileName);
                       imagemaster obj = new imagemaster();
                       obj.Remark = remark;
                       obj.ImageName = FileName;
                       wmsEN.imagemasters.Add(obj);
                       wmsEN.SaveChanges();
                   }
               }
           }
           return "Upload Failed";
       }

For this article, I have created an Angular project using Angular 7. For creating an Angular project, we need to follow the following steps.

 

Step 1

 

I have created a project using the following command in the Command Prompt.

ng new fileupload

Step 2

 

Open project in Visual Studio Code using the following commands.

cd fileupload

code .

 

Step 3

 

Now, we need to install bootstrap in our project using the following command in the terminal.

npm install --save bootstrap

Step 4

 

After installing bootstrap, we should import bootstrap in style.css.

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

Step 5

 

I have declared methods to upload images using the following code in App.component.ts

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

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'fileupload';
  remark = '';
  constructor(private httpService: HttpClient) { }
  myFiles: string[] = [];

  sMsg: string = '';
  StudentIdUpdate: string;
  ngOnInit() {}

  getFileDetails(e) {
    //console.log (e.target.files);
    for (var i = 0; i < e.target.files.length; i++) {
      this.myFiles.push(e.target.files[i]);
    }
  }
  uploadFiles() {
    const frmData = new FormData();
    for (var i = 0; i < this.myFiles.length; i++) {
      frmData.append("fileUpload", this.myFiles[i]);
      if (i == 0) {
        frmData.append("remark", this.remark);
      }
    }
    this.httpService.post('http://localhost:50401/api/FileUpload/UploadFiles', frmData).subscribe(
      data => {
        // SHOW A MESSAGE RECEIVED FROM THE WEB API.
        this.sMsg = data as string;
        console.log(this.sMsg);
      }
    );
  }
}

Step 6

 

Put this code in app.component.html 

<!--The content below is only a placeholder and can be replaced.-->
<div style="text-align:center">
  <h1>
    Welcome to {{ title }}!
  </h1>
  <img width="300" alt="Angular Logo" src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNTAgMjUwIj4KICAgIDxwYXRoIGZpbGw9IiNERDAwMzEiIGQ9Ik0xMjUgMzBMMzEuOSA2My4ybDE0LjIgMTIzLjFMMTI1IDIzMGw3OC45LTQzLjcgMTQuMi0xMjMuMXoiIC8+CiAgICA8cGF0aCBmaWxsPSIjQzMwMDJGIiBkPSJNMTI1IDMwdjIyLjItLjFWMjMwbDc4LjktNDMuNyAxNC4yLTEyMy4xTDEyNSAzMHoiIC8+CiAgICA8cGF0aCAgZmlsbD0iI0ZGRkZGRiIgZD0iTTEyNSA1Mi4xTDY2LjggMTgyLjZoMjEuN2wxMS43LTI5LjJoNDkuNGwxMS43IDI5LjJIMTgzTDEyNSA1Mi4xem0xNyA4My4zaC0zNGwxNy00MC45IDE3IDQwLjl6IiAvPgogIDwvc3ZnPg==">
</div>

<div class="col-sm-5">
  <ng-container>
      <input type="file" id="file" multiple (change)="getFileDetails($event)">
      <input type="text" [(ngModel)]="remark">
      <button class="btn btn-primary" (click)="uploadFiles()">Upload</button>
  </ng-container>
</div>

Now, run the project using the following command.

ng serve

 

 

 

Summary

 

In this article, I have discussed how to upload multiple images in a Web API using Angular 7. In my next article, I am going to discuss how to upload a video using Angular 7 in a Web API.