File or Image upload in Angular 7 project

Posted By :Gagan Thakur |14th November 2019

In this blog we will learn how to use file Upload and File progress in an angular7 project.

Before start file uploading, We need a Angular 7 Project. You can create by using following commands : 

npm install -g @angular/cli // To install angular CLI
ng new helloworld  // To setup new project with the name "helloworld"
cd helloworld // to enter into the project directory
ng serve -o // to serve your new project on local system/browser

 

So let’s get started

Create template
First we need to create template. In this template we will create file input element that allows to us to choose the file and a button to submit the form. To create it open the app.component.html file and put the below html on it. Instead of app.component.html you can put on another component too!

<div class="container">

    <div class="row">

        <div class="col-md-6 offset-md-3">

            <h3>Choose File</h3>

            <form (ngSubmit)="onSubmit()">

                <div class="form-group">

                    <input type="file" name="image"  />

                </div>

                <div class="form-group">

                    <button class="btn btn-primary">Submit</button>

                </div>

            </form>

        </div>

    </div>

</div>

 

Configure the HttpClientModule
We can use HttpClient to upload the file on the server for our angular7 project.

firstly, open src/app/app.module.ts then add this import to your file.

import { HttpClientModule } from '@angular/common/http';

Add HttpClientModule to imports array under @NgModule

imports: [
    HttpClientModule
]

Now open the app.component.ts file and put the below code on it

fileData: File = null;

constructor(private http: HttpClient) { }

 

fileProgress(fileInput: any) {

    this.fileData = <File>fileInput.target.files[0];

}

 

onSubmit() {

    const formData = new FormData();

    formData.append('file', this.fileData);

    this.http.post('url/to/your/api', formData)

      .subscribe(res => {

        console.log(res);

        alert('SUCCESS !!');

      })

}

Here you can see the two methods onSubmit and fileProgress. The fileProgress method will called when the user choose file. It will get the file object of selected file and store in the fileData.

The onSubmit function will called when the form submit. Here we have created a formData object.

We will store the file object to the formData and then upload it to the server via Angular 7 HttpClient After the changes our app.component.ts file will looks like this

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 = 'helloworld';

   

  fileData = null;

  constructor(private http: HttpClient) { }

 

  ngOnInit() {

     

   

  }

 

  fileProgress(fileInput: any) {

    this.fileData = <File>fileInput.target.files[0];

  }

 

  onSubmit() {

    const formData = new FormData();

    formData.append('file', this.fileData);

    this.http.post('url/to/your/api', formData)

      .subscribe(res => {

        console.log(res);

        alert('SUCCESS !!');

      })

  }

 

}

 

Now you can upload the file, But in some case you need more control

Progress Event
If you are dealing with the big file or You may want to show progress to user, Angular 7 httpClient gives you the progress status.

First of all open the app.component.ts file and put the below import

import { HttpClient, HttpEventType } from '@angular/common/http';

Then you just need to add reportProgress to true and set the observe to events in the config like we have below. You will get all the events on subscribe

this.http.post('url/to/your/api', formData, {

    reportProgress: true,

    observe: 'events'   

})

.subscribe(events => {

    if(events.type == HttpEventType.UploadProgress) {

        console.log('Upload progress: ', Math.round(events.loaded / events.total * 100) + '%');

    } else if(events.type === HttpEventType.Response) {

        console.log(events);

    }

})

 

Thats it, by using these simple steps you can simply use file/image uploader in your angular project.

 

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About Author

Gagan Thakur

Frontend Developer with the experience and capabilities to build web applications using technologies like HTML, CSS, Bootstrap and client side scripts like Java Script .

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