Convert PDF/A to PDF format

Convert PDF/A to PDF format

  /*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 ffilePdfAConvertToPDF = e => {
      const file_reader = new FileReader();
      file_reader.onload = event => {
        /*convert a PDF/A-file to PDF and save the "ResultConvertToPDF.pdf" - Ask Web Worker*/
        AsposePDFWebWorker.postMessage({ "operation": 'AsposePdfAConvertToPDF', "params": [event.target.result, e.target.files[0].name, "ResultConvertToPDF.pdf"] }, [event.target.result]);
      };
      file_reader.readAsArrayBuffer(e.target.files[0]);
    };
  /// [Code snippet]

    /*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;
      }

The following JavaScript code snippet shows simple example of coverting PDF/A to PDF:

1. Select a PDF file for converting.
2. Create a ‘FileReader’.
3. The AsposePdfAConvertToPDF function is executed.
4. The name of the resulting file is set, in this example “ResultConvertToPDFA.pdf”.
5. Next, if the ‘json.errorCode’ is 0, then your DownloadFile is given the name you specified earlier. If the ‘json.errorCode’ parameter is not equal to 0 and, accordingly, there will be an error in your file, then information about such an error will be contained in the ‘json.errorText’ file.
6. As a result, the DownloadFile function generates a link and allows you to download the resulting file to the user’s operating system.

    var ffilePdfAConvertToPDF = function (e) {
      const file_reader = new FileReader();
      file_reader.onload = (event) => {
        /*convert a PDF/A-file to PDF and save the "ResultConvertToPDF.pdf"*/
        const json = AsposePdfAConvertToPDF(event.target.result, e.target.files[0].name, "ResultConvertToPDF.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]);
    };