FileReader onload works on browser but not in mobile ( ionic 6) capacitor

FileReader onload works on browser but not in mobile (Ionic 6) Capacitor

If you are developing a mobile application using Ionic 6 and Capacitor, you may have encountered an issue where the FileReader onload event works perfectly fine on a browser but fails to trigger on a mobile device. This can be frustrating, but don’t worry, there are solutions available to overcome this problem.

Solution 1: Using the `readAsDataURL` method

One possible solution is to use the readAsDataURL method instead of readAsText or readAsArrayBuffer. The readAsDataURL method will read the file as a base64-encoded string, which is compatible with both browsers and mobile devices.

Here’s an example code snippet to demonstrate this solution:

const fileInput = document.getElementById('file-input');
const file = fileInput.files[0];

const reader = new FileReader();

reader.onload = (event) => {
  const base64String = event.target.result;
  // Do something with the base64-encoded string
};

reader.readAsDataURL(file);

This solution should work on both browsers and mobile devices, ensuring that the onload event is triggered correctly.

Solution 2: Using the Capacitor Filesystem plugin

Another solution is to utilize the Capacitor Filesystem plugin, which provides a unified API for reading and writing files across different platforms.

First, make sure you have installed the Capacitor Filesystem plugin by running the following command:

npm install @capacitor/filesystem
npx cap sync

Then, you can use the plugin’s readFile method to read the file and handle it accordingly. Here’s an example code snippet:

import { Plugins } from '@capacitor/core';
const { Filesystem } = Plugins;

const fileInput = document.getElementById('file-input');
const file = fileInput.files[0];

Filesystem.readFile({
  path: file.name,
  directory: 'DOCUMENTS'
}).then(result => {
  const data = result.data;
  // Do something with the file data
}).catch(error => {
  console.error('Error reading file:', error);
});

By using the Capacitor Filesystem plugin, you can ensure that the file reading functionality works consistently across browsers and mobile devices.

With these solutions at your disposal, you should be able to overcome the issue of the FileReader onload event not working on mobile devices while using Ionic 6 and Capacitor.

Remember to choose the solution that best fits your specific requirements and project setup. Happy coding!

FileReader onload works on browser but not in mobile ( ionic 6) capacitor