Can a blob file be transformed into base64Data using Javascript specifically in Ionic and Angular frameworks?

Question

Can a blob file be transformed into base64Data using Javascript specifically in Ionic and Angular frameworks?

https://i.stack.imgur.com/3aMyx.png[

async FileZip() {
    const code = await fetch("./assets/input.txt")
    var blob = await downloadZip([code]).blob()
     console.log(blob);

 
   function blobToBase64(blob: Blob): Observable<string> {
      return new Observable<string>(observer => {
          const reader = new FileReader();
         reader.onerror = observer.error;
          reader.onabort = observer.error;
          reader.onload = () =>                     observer.next(reader.result as string);
          reader.onloadend = observer.complete;


    FileSharer.share({
      filename: "input.zip",
      base64Data: //base64datawillbehere ,
      contentType: 'application/zip'
    });
    reader.readAsDataURL(blob);
  })

I am brand new to the world of Ionic and App Development. I've successfully compressed a text file into a zip blob file using client-zip library. After utilizing downloadZip(), I obtained a zip blob file similar to this example. Now, my goal is to share this file as a zip file using Capacitor Filesharer. However, it appears that in order to use this Filesharer plugin, I need to convert the blob zip file into base64 data. Could someone provide guidance on how to achieve this? Is it even possible? Please excuse any ignorance in my question, as I'm still learning the ropes of JavaScript.

javascript angular typescript ionic-framework blob

Answer 1

Answer №1

Here is a useful function that you should consider implementing:

function convertBlobToBase64(blob: Blob): Observable<string> {
    return new Observable<string>(observer => {
        const reader = new FileReader();
        reader.onerror = observer.error;
        reader.onabort = observer.error;
        reader.onload = () => observer.next(reader.result as string);
        reader.onloadend = observer.complete;
        reader.readAsDataURL(blob);
    })
}

Answer 2

Here is a useful function that you should consider implementing:

function convertBlobToBase64(blob: Blob): Observable<string> {
    return new Observable<string>(observer => {
        const reader = new FileReader();
        reader.onerror = observer.error;
        reader.onabort = observer.error;
        reader.onload = () => observer.next(reader.result as string);
        reader.onloadend = observer.complete;
        reader.readAsDataURL(blob);
    })
}

Answer 3

Answer №2

Consider making the following adjustments to your code: (keeping the previous answer unchanged could help others who want to utilize the Observable strategy, unlike your scenario where using Promise is recommended)

ngOnInit(): void {
  this.fileZip();
}

private blobToBase64(blob: Blob): Promise<string> {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.onerror = reject;
    reader.onabort = reject;
    reader.onload = () => resolve(reader.result as string);
    reader.readAsDataURL(blob);
  })
}

private async fileZip(): Promise<void> {
  const code = await fetch("./assets/input.txt")
  const blob = await downloadZip([code]).blob();
  const base64Data = await this.blobToBase64(blob);
  await FileSharer.share({
    filename: "input.zip",
    base64Data: base64Data,
    contentType: "application/zip",
  })
}

Answer 4

Consider making the following adjustments to your code: (keeping the previous answer unchanged could help others who want to utilize the Observable strategy, unlike your scenario where using Promise is recommended)

ngOnInit(): void {
  this.fileZip();
}

private blobToBase64(blob: Blob): Promise<string> {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.onerror = reject;
    reader.onabort = reject;
    reader.onload = () => resolve(reader.result as string);
    reader.readAsDataURL(blob);
  })
}

private async fileZip(): Promise<void> {
  const code = await fetch("./assets/input.txt")
  const blob = await downloadZip([code]).blob();
  const base64Data = await this.blobToBase64(blob);
  await FileSharer.share({
    filename: "input.zip",
    base64Data: base64Data,
    contentType: "application/zip",
  })
}

Answer 5

Answer №3

Here is a code snippet that might help you:

functionZipFiles() {
constfiles = awaitfetch("./data/files.txt");
varzipFile = awaitcreateZip(files);
console.log(zipFile);
varzipData = newBlob();
zipData.readAsDataURL(zipFile); 
zipData.onloadend = ()=> {
constresult = zipData.resultasstring;
constencodedData = result.split(',')[1];
console.log(encodedData)
DownloadManager.downloadFile({
filename:"archive.zip",
data: encodedData,
type:'application/zip'
    });
  }
}

Answer 6

Here is a code snippet that might help you:

functionZipFiles() {
constfiles = awaitfetch("./data/files.txt");
varzipFile = awaitcreateZip(files);
console.log(zipFile);
varzipData = newBlob();
zipData.readAsDataURL(zipFile); 
zipData.onloadend = ()=> {
constresult = zipData.resultasstring;
constencodedData = result.split(',')[1];
console.log(encodedData)
DownloadManager.downloadFile({
filename:"archive.zip",
data: encodedData,
type:'application/zip'
    });
  }
}

Can a blob file be transformed into base64Data using Javascript specifically in Ionic and Angular frameworks?

Answer №1

Answer №2

Answer №3

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