- Create a Service to Handle PDF Generation and Download:
First, create a service to manage the PDF files. This service will handle generating blob URLs and triggering downloads.
typescriptimport { Injectable } from '@angular/core';
@Injectable({
providedIn: 'root'
})
export class PdfService {
constructor() { }
generateBlobUrl(pdfData: Blob): string {
return URL.createObjectURL(pdfData);
}
downloadPdf(blobUrl: string, fileName: string): void {
const a = document.createElement('a');
a.href = blobUrl;
a.download = fileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
URL.revokeObjectURL(blobUrl);
}
}
- Create a Component to Trigger the Download:
Next, create a component that will call the service to generate and download the PDFs.
typescriimport { Component } from '@angular/core';
import { PdfService } from './pdf.service';
@Component({
selector: 'app-pdf-downloader',
templateUrl: './pdf-downloader.component.html',
})
export class PdfDownloaderComponent {
constructor(private pdfService: PdfService) {}
downloadBulkPdfs() {
const pdfDataArray: { data: Blob; name: string }[] = this.getPdfData();
pdfDataArray.forEach(pdf => {
const blobUrl = this.pdfService.generateBlobUrl(pdf.data);
this.pdfService.downloadPdf(blobUrl, pdf.name);
});
}
private getPdfData(): { data: Blob; name: string }[] {
// Simulating PDF data retrieval. Replace this with actual PDF data retrieval logic.
return [
{ data: new Blob(['PDF Content 1'], { type: 'application/pdf' }), name: 'file1.pdf' },
{ data: new Blob(['PDF Content 2'], { type: 'application/pdf' }), name: 'file2.pdf' },
// Add more PDF data as needed
];
}
}
- Create the HTML Template:
Finally, create an HTML template for your component.
html<button (click)="downloadBulkPdfs()">Download PDFs</button>
Explanation:
- Blob Creation: Each PDF is represented as a
Blob
. Replace the simulated PDF data ingetPdfData
with your actual PDF generation logic. - Blob URLs:
URL.createObjectURL()
generates a URL for each PDF Blob. - Download Logic: A temporary anchor element is created for downloading each PDF file.
- Memory Management:
URL.revokeObjectURL()
is called after the download to release memory.
Final Notes:
Ensure you have the necessary permissions and configurations set up in your Angular application to handle file downloads properly. You may also want to handle errors and loading states for a better user experience.
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