Modify the name of the document

I have a piece of code that retrieves a file from the clipboard and I need to change its name if it is named image.png.

Below is the code snippet where I attempt to achieve this:

@HostListener('paste', ['$event'])
onPaste(e: ClipboardEvent) {
  const clipboardData = e.clipboardData || (window as any).clipboardData;
  const items: DataTransferItem[] = Array.from(clipboardData.items);
  let copiedFiles: File[] = [];

  for (let i = 0; i < items.length; i++) {
    let file = items[i].getAsFile();
    if (file.name.includes('image')) {
      file.name = this.getScreenshotFilename();
    } 
    copiedFiles.push(items[i].getAsFile());
  }

  this.files = this.concat(copiedFiles);
}

private getScreenshotFilename(): string {
  return `Screenshot_${formatDate(new Date(), 'yymmddHHMMss', DATE_LOCALE)}`;
}

However, when attempting to set the file name in this line

file.name = this.getScreenshotFilename();
, an error occurs:

Cannot assign to 'name' because it is a read-only property.

Is there a way to edit the file name?

Answer №1

Visit MDN File() documentation

Create a new File object: new File([oldFile], 'image.png', { type: oldFile.type })

  // ...

  @HostListener('paste', ['$event'])
  onPaste(e: ClipboardEvent) {
    const clipboardData = e.clipboardData || (window as any).clipboardData;
    const items: DataTransferItem[] = Array.from(clipboardData.items);
    let copiedFiles: File[] = [];

    for (let i = 0; i < items.length; i++) {
      let file = items[i].getAsFile();
      let newFile;

      if (file.name.includes('image')) {
        newFile = new File([file], this.generateFileName(), { type: file.type })
        
        copiedFiles.push(newFile);
      } else {
        // Handle exceptions here
      }
    }

    this.files = this.concatenateFiles(copiedFiles);
  }

  private generateFileName(): string {
  return `Screenshot_${formatDate(new Date(), 'yymmddHHMMss', DATE_LOCALE)}`;
}

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