test.ts

saveDocument(name: string) {

  let streamType = TXTextControl.StreamType.InternalUnicodeFormat;

  switch (this.selectedDocument?.name.split('.').pop()) {
    case 'docx':
      streamType = TXTextControl.StreamType.WordprocessingML;
      break;
    case 'rtf':
      streamType = TXTextControl.StreamType.RichTextFormat;
      break;
    case 'doc':
      streamType = TXTextControl.StreamType.MSWord;
      break;
  }

  TXTextControl.saveDocument(streamType, (document: any) => {
    if (this.selectedDocument) {
      this.selectedDocument.data = document.data;

      // Send a POST request to the server
      this.http.post('/document/save', this.selectedDocument).subscribe(
        (result) => {
          alert("Document saved successfully");
          this.getFilenames();
        }
      );
    }
  });
}