typescript - How to save a downloaded file with Capacitor in Ionic4 Angular?

Typescript - How to save a downloaded file with Capacitor in Ionic4 Angular?

To save a downloaded file with Capacitor in an Ionic 4 Angular application, you can use Capacitor's Filesystem API. Here's a step-by-step guide:

  1. Install Capacitor Plugins: Make sure you have Capacitor installed in your Ionic project. If not, you can install it using the following command:
npm install @capacitor/core @capacitor/cli

You'll also need to install the @capacitor/filesystem plugin:

npm install @capacitor/filesystem
  1. Add the Platform: Before using any Capacitor plugin, you need to add the platform to your project. For example, for iOS:
npx cap add ios

Or for Android:

npx cap add android
  1. Download the File: Use whatever method you prefer to download the file. For example, you can use Angular's HttpClient:
import { HttpClient } from '@angular/common/http'; import { Injectable } from '@angular/core'; @Injectable({ providedIn: 'root' }) export class FileDownloadService { constructor(private http: HttpClient) { } downloadFile(url: string): Promise<Blob> { return this.http.get(url, { responseType: 'blob' }).toPromise(); } }
  1. Save the File: Once you have downloaded the file as a Blob, you can use Capacitor's Filesystem API to save it. Here's how you can do it:
import { Filesystem } from '@capacitor/filesystem'; import { Platform } from '@ionic/angular'; import { Injectable } from '@angular/core'; @Injectable({ providedIn: 'root' }) export class FileSaveService { constructor(private platform: Platform) { } async saveFile(blob: Blob, fileName: string): Promise<void> { if (this.platform.is('hybrid')) { const { FilesystemDirectory } = Filesystem; const directory = FilesystemDirectory.Documents; const path = `${directory}/${fileName}`; await Filesystem.writeFile({ path, data: blob, directory, recursive: true }); } else { // For web, use browser's download functionality const url = window.URL.createObjectURL(blob); const a = document.createElement('a'); a.href = url; a.download = fileName; document.body.appendChild(a); a.click(); window.URL.revokeObjectURL(url); document.body.removeChild(a); } } }

In this code:

  • We check if the platform is hybrid (iOS or Android). If it is, we use Capacitor's Filesystem API to write the file to the device's file system.
  • If it's not a hybrid platform (likely a web browser), we create a temporary URL for the blob, create an <a> element, set the href and download attributes, simulate a click, and then clean up.

Remember to handle platform-specific logic based on your requirements and use cases. Also, don't forget to handle any potential errors that may occur during the file saving process.

Examples

  1. How to download a file in Ionic 4 using Capacitor and TypeScript? Description: This query seeks guidance on implementing file download functionality in an Ionic 4 app using Capacitor and TypeScript. It may involve downloading files from a remote server and saving them locally on the device.

    import { Filesystem, Directory } from '@capacitor/filesystem'; async function downloadFile(url: string, filename: string) { const response = await fetch(url); const blob = await response.blob(); await Filesystem.writeFile({ path: filename, data: blob, directory: Directory.Documents }); } // Example usage downloadFile('https://example.com/file.pdf', 'downloaded_file.pdf');

  2. Ionic 4 Capacitor download file and save it to a specific directory using TypeScript Description: This query focuses on downloading a file in an Ionic 4 app using Capacitor and TypeScript and then saving it to a specific directory on the device, such as the Downloads directory.

    import { Filesystem, Directory } from '@capacitor/filesystem'; async function downloadAndSaveFile(url: string, directory: Directory, filename: string) { const response = await fetch(url); const blob = await response.blob(); await Filesystem.writeFile({ path: `${directory}/${filename}`, data: blob }); } // Example usage downloadAndSaveFile('https://example.com/file.pdf', Directory.Downloads, 'downloaded_file.pdf');

  3. How to use Capacitor to download files in Ionic 4 using TypeScript? Description: This query seeks guidance on utilizing Capacitor in an Ionic 4 app with TypeScript for downloading files. It may include handling different file types and saving them locally.

    import { Filesystem } from '@capacitor/filesystem'; async function downloadFile(url: string, filename: string) { const response = await fetch(url); const blob = await response.blob(); await Filesystem.writeFile({ path: filename, data: blob, directory: FilesystemDirectory.Documents }); } // Example usage downloadFile('https://example.com/file.pdf', 'downloaded_file.pdf');

  4. Ionic 4 Capacitor file download and save example with TypeScript Description: This query looks for an example implementation demonstrating how to download and save files in an Ionic 4 app using Capacitor and TypeScript.

    import { Filesystem } from '@capacitor/filesystem'; async function downloadAndSaveFile(url: string, filename: string) { const response = await fetch(url); const blob = await response.blob(); await Filesystem.writeFile({ path: filename, data: blob, directory: FilesystemDirectory.Documents }); } // Example usage downloadAndSaveFile('https://example.com/file.pdf', 'downloaded_file.pdf');

  5. How to save a downloaded file with Capacitor in Ionic 4 using TypeScript? Description: This query focuses specifically on saving downloaded files in an Ionic 4 app using Capacitor and TypeScript, potentially addressing file storage and retrieval mechanisms.

    import { Filesystem } from '@capacitor/filesystem'; async function saveDownloadedFile(filename: string, blob: Blob) { await Filesystem.writeFile({ path: filename, data: blob, directory: FilesystemDirectory.Documents }); } // Example usage saveDownloadedFile('downloaded_file.pdf', downloadedBlob);

  6. Ionic 4 Capacitor download file to specific folder TypeScript Description: This query seeks information on how to download a file to a specific folder within an Ionic 4 app using Capacitor and TypeScript, potentially specifying a custom directory for file storage.

    import { Filesystem } from '@capacitor/filesystem'; async function downloadFileToFolder(url: string, folder: string, filename: string) { const response = await fetch(url); const blob = await response.blob(); await Filesystem.writeFile({ path: `${folder}/${filename}`, data: blob, directory: FilesystemDirectory.Documents }); } // Example usage downloadFileToFolder('https://example.com/file.pdf', 'my_folder', 'downloaded_file.pdf');

  7. Ionic 4 Capacitor save downloaded file to device storage TypeScript Description: This query is interested in how to save files downloaded within an Ionic 4 app to the device storage using Capacitor and TypeScript, focusing on robust storage solutions.

    import { Filesystem } from '@capacitor/filesystem'; async function saveToDeviceStorage(filename: string, blob: Blob) { await Filesystem.writeFile({ path: filename, data: blob, directory: FilesystemDirectory.Documents }); } // Example usage saveToDeviceStorage('downloaded_file.pdf', downloadedBlob);

  8. How to download and save a file with Capacitor in Ionic 4 using TypeScript? Description: This query is about the general process of downloading and saving files within an Ionic 4 app using Capacitor and TypeScript, encompassing the entire workflow from fetching to storage.

    import { Filesystem } from '@capacitor/filesystem'; async function downloadAndSaveFile(url: string, filename: string) { const response = await fetch(url); const blob = await response.blob(); await Filesystem.writeFile({ path: filename, data: blob, directory: FilesystemDirectory.Documents }); } // Example usage downloadAndSaveFile('https://example.com/file.pdf', 'downloaded_file.pdf');

  9. How to implement file download and save functionality in Ionic 4 using Capacitor and TypeScript? Description: This query is about implementing file download and save functionality within an Ionic 4 app using Capacitor and TypeScript, potentially involving user interactions and error handling.

    import { Filesystem } from '@capacitor/filesystem'; async function downloadAndSaveFile(url: string, filename: string) { const response = await fetch(url); const blob = await response.blob(); await Filesystem.writeFile({ path: filename, data: blob, directory: FilesystemDirectory.Documents }); } // Example usage downloadAndSaveFile('https://example.com/file.pdf', 'downloaded_file.pdf');

  10. Ionic 4 Capacitor save downloaded file with TypeScript Description: This query seeks information on how to save files downloaded within an Ionic 4 app using Capacitor and TypeScript, focusing on straightforward and efficient implementation methods.

    import { Filesystem } from '@capacitor/filesystem'; async function saveDownloadedFile(filename: string, blob: Blob) { await Filesystem.writeFile({ path: filename, data: blob, directory: FilesystemDirectory.Documents }); } // Example usage saveDownloadedFile('downloaded_file.pdf', downloadedBlob);

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