Creating and downloading a text/JSON file with dynamic content in Angular 2+ is simple and straightforward

Question

Creating and downloading a text/JSON file with dynamic content in Angular 2+ is simple and straightforward

I'm seeking guidance on how to create a text file or JSON file with dynamic data that can be downloaded. Below is the service code:

Service Code

  validateUserData(userId) {
    var headers = new Headers();

    return this.http.get(`${this.baseUrl}/Users?userId=`+userId,{headers: headers}).map(result => {

      return result.json();

    });
  }

Component.ts

this.service.validateUserData(userId).subscribe( res => {

       console.log(res);    
       new Angular2Txt(res, 'My Report');
     });

I want to send the Response to a text or JSON file for user download. How can I achieve this utilizing the Angular package?

I attempted using the above package but only managed to download an empty file.

angular typescript

Answer 1

Answer №1

Here is a simple solution that does not require any external packages:

Link to Code

@Component({
  ...
})
export class AppComponent {
  private setting = {
    element: {
      dynamicDownload: null as HTMLElement
    }
  }

  fakeValidateUserData() {
    return of({
      userDate1: 1,
      userData2: 2
    });
  }
  
  dynamicDownloadTxt() {
    this.fakeValidateUserData().subscribe((res) => {
      this.dyanmicDownloadByHtmlTag({
        fileName: 'My Report',
        text: JSON.stringify(res)
      });
    });

  }

  dynamicDownloadJson() {
    this.fakeValidateUserData().subscribe((res) => {
      this.dyanmicDownloadByHtmlTag({
        fileName: 'My Report.json',
        text: JSON.stringify(res)
      });
    });
  }

  private dyanmicDownloadByHtmlTag(arg: {
    fileName: string,
    text: string
  }) {
    if (!this.setting.element.dynamicDownload) {
      this.setting.element.dynamicDownload = document.createElement('a');
    }
    const element = this.setting.element.dynamicDownload;
    const fileType = arg.fileName.indexOf('.json') > -1 ? 'text/json' : 'text/plain';
    element.setAttribute('href', `data:${fileType};charset=utf-8,${encodeURIComponent(arg.text)}`);
    element.setAttribute('download', arg.fileName);

    var event = new MouseEvent("click");
    element.dispatchEvent(event);
  }
}

<a (click)="dynamicDownloadTxt()">Download Txt</a>
<a (click)="dynamicDownloadJson()">Download JSON</a>

Answer 2

Here is a simple solution that does not require any external packages:

Link to Code

@Component({
  ...
})
export class AppComponent {
  private setting = {
    element: {
      dynamicDownload: null as HTMLElement
    }
  }

  fakeValidateUserData() {
    return of({
      userDate1: 1,
      userData2: 2
    });
  }
  
  dynamicDownloadTxt() {
    this.fakeValidateUserData().subscribe((res) => {
      this.dyanmicDownloadByHtmlTag({
        fileName: 'My Report',
        text: JSON.stringify(res)
      });
    });

  }

  dynamicDownloadJson() {
    this.fakeValidateUserData().subscribe((res) => {
      this.dyanmicDownloadByHtmlTag({
        fileName: 'My Report.json',
        text: JSON.stringify(res)
      });
    });
  }

  private dyanmicDownloadByHtmlTag(arg: {
    fileName: string,
    text: string
  }) {
    if (!this.setting.element.dynamicDownload) {
      this.setting.element.dynamicDownload = document.createElement('a');
    }
    const element = this.setting.element.dynamicDownload;
    const fileType = arg.fileName.indexOf('.json') > -1 ? 'text/json' : 'text/plain';
    element.setAttribute('href', `data:${fileType};charset=utf-8,${encodeURIComponent(arg.text)}`);
    element.setAttribute('download', arg.fileName);

    var event = new MouseEvent("click");
    element.dispatchEvent(event);
  }
}

<a (click)="dynamicDownloadTxt()">Download Txt</a>
<a (click)="dynamicDownloadJson()">Download JSON</a>

Answer 3

Answer №2

To begin with, we can utilize a library to assist in saving the file. I recently tested out FileSaver and found that it functions effectively, making it a suitable starting point.

Next, set up your HTTP request to return a Blob. Using HttpClient, the process is quite simple:

let url = "https://jsonplaceholder.typicode.com/todos/1";
this.http.get(url, {responseType: 'blob'})

Lastly, upon subscribing, save the blob using the aforementioned npm package as demonstrated below:

import { saveAs } from 'file-saver/FileSaver';

// ...

    let url = "https://jsonplaceholder.typicode.com/todos/1";
    this.http.get(url, {responseType: 'blob'})
      .subscribe((res) => {
        console.log(res)
        saveAs(res, "myfile.json")
      })

The specified filename in this scenario relates to the second option.

Check out the StackBlitz demo here

If you wish to witness the file download in action, uncomment the saveAs line.

Answer 4

To begin with, we can utilize a library to assist in saving the file. I recently tested out FileSaver and found that it functions effectively, making it a suitable starting point.

Next, set up your HTTP request to return a Blob. Using HttpClient, the process is quite simple:

let url = "https://jsonplaceholder.typicode.com/todos/1";
this.http.get(url, {responseType: 'blob'})

Lastly, upon subscribing, save the blob using the aforementioned npm package as demonstrated below:

import { saveAs } from 'file-saver/FileSaver';

// ...

    let url = "https://jsonplaceholder.typicode.com/todos/1";
    this.http.get(url, {responseType: 'blob'})
      .subscribe((res) => {
        console.log(res)
        saveAs(res, "myfile.json")
      })

The specified filename in this scenario relates to the second option.

Check out the StackBlitz demo here

If you wish to witness the file download in action, uncomment the saveAs line.

Answer 5

Answer №3

One way to achieve this is by following these steps:

let data = "Content to store in a document";
const fileBlob = new Blob([data], { type: 'text/plain' });
const fileUrl = window.URL.createObjectURL(fileBlob);
window.open(fileUrl);

Answer 6

One way to achieve this is by following these steps:

let data = "Content to store in a document";
const fileBlob = new Blob([data], { type: 'text/plain' });
const fileUrl = window.URL.createObjectURL(fileBlob);
window.open(fileUrl);

Creating and downloading a text/JSON file with dynamic content in Angular 2+ is simple and straightforward

Answer №1

Answer №2

Answer №3

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