AsposePdfDeletePages

Delete pages from a PDF-file.

function AsposePdfDeletePages(
    fileBlob,
    fileName,
    fileNameResult,
    numPages
)

Parameters:

• fileBlob Blob object
• fileName file name
• fileNameResult result file name
• numPages page numbers:
  • string, include page numbers with intervals as “7, 20, 22, 30-32, 33, 36-40, 46”
  • array, array of page numbers, such as [1,3]
  • number, page number as 2

Return:

JSON object

• errorCode - code error (0 no error)
• errorText - text error ("" no error)
• fileNameResult - result file name

Web Worker example:

  /*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 ffileDeletePages = e => {
    const file_reader = new FileReader();
    file_reader.onload = event => {
      /*string, include number pages with interval: "7, 20, 22, 30-32, 33, 36-40, 46"*/
      const numPages = "1-3";
      /*array, array of number pages*/
      /*const numPages = [1,3];*/
      /*number, number page*/
      /*const numPages = 1;*/
      /*Delete pages from a PDF-file and save the "ResultDeletePages.pdf - Ask Web Worker"*/
      AsposePDFWebWorker.postMessage(
        { "operation": 'AsposePdfDeletePages',
          "params": [event.target.result, e.target.files[0].name, "ResultDeletePages.pdf", numPages] },
        [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;
    }

Simple example:

  var ffileDeletePages = function (e) {
    const file_reader = new FileReader();
    file_reader.onload = (event) => {
      /*Delete pages from a PDF-file and save the "ResultOptimize.pdf"*/
      const json = AsposePdfDeletePages(event.target.result, e.target.files[0].name, "ResultDeletePages.pdf", "1-3");
      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]);
  };