AsposePdfFromImage

function AsposePdfFromImage(
    fileBlob,
    fileName,
    pdfPageSize,
    margin,
    isLandscape,
    fileNameResult 
)

  /*Create Web Worker*/
  const AsposePDFWebWorker = new Worker("AsposePDFforJS.js");
  AsposePDFWebWorker.onerror = evt => console.log(`Error from Web Worker: ${evt.message}`);
  AsposePDFWebWorker.onmessage = evt => document.getElementById('output').textContent = 
    (evt.data == 'ready') ? 'loaded!' :
      (evt.data.json.errorCode == 0) ? `Result:\n${DownloadFile(evt.data.json.fileNameResult, "application/pdf", evt.data.params[0])}` : `Error: ${evt.data.json.errorText}`;

  /*Event handler*/
  const ffileFromImage = e => {
    const file_reader = new FileReader();
    file_reader.onload = event => {
      /*Convert a Image-file to PDF and save the "ResultPDFFromImage.pdf" - Ask Web Worker*/
      AsposePDFWebWorker.postMessage({ "operation": 'AsposePdfFromImage', "params": [event.target.result, e.target.files[0].name, 'Module.PdfPageSize.A4', 0, true, "ResultPDFFromImage.pdf"] }, [event.target.result]);
    };
    file_reader.readAsArrayBuffer(e.target.files[0]);
  };

  /*Make a link to download the result file*/
  const DownloadFile = (filename, mime, content) => {
      mime = mime || "application/octet-stream";
      var link = document.createElement("a"); 
      link.href = URL.createObjectURL(new Blob([content], {type: mime}));
      link.download = filename;
      link.innerHTML = "Click here to download the file " + filename;
      document.body.appendChild(link); 
      document.body.appendChild(document.createElement("br"));
      return filename;
    }

  var ffileFromImage = function (e) {
    const file_reader = new FileReader();
    file_reader.onload = (event) => {
      /*Convert a Image-file to PDF and save the "ResultPDFFromImage.pdf"*/
      const json = AsposePdfFromImage(event.target.result, e.target.files[0].name, Module.PdfPageSize.A4, 10, false, "ResultPDFFromImage.pdf");
      if (json.errorCode == 0) document.getElementById('output').textContent = json.fileNameResult;
      else document.getElementById('output').textContent = json.errorText;
      /*Make a link to download the result file*/
      DownloadFile(json.fileNameResult, "application/pdf");
    }
    file_reader.readAsArrayBuffer(e.target.files[0]);
  }