AsposePdfFindHiddenText

Find hidden text in a PDF-file.

function AsposePdfFindHiddenText(
    fileBlob,
    fileName
)

Parameters:

• fileBlob Blob object
• fileName file name

Return:

JSON object

• errorCode - code error (0 no error)
• errorText - text error ("" no error)
• textFragments - array of :
  • text - text fragment
  • xIndent - X coordinate
  • yIndent - Y coordinate
  • fontName - font name
  • fontSize - font size

Web Worker example:

  /*Create Web Worker*/
  const AsposePDFWebWorker = new Worker("AsposePDFforJS.js");
  AsposePDFWebWorker.onerror = evt => console.log(`Error from Web Worker: ${evt.message}`);
  AsposePDFWebWorker.onmessage = evt => document.getElementById('output').textContent = 
    (evt.data == 'ready') ? 'loaded!' :
      (evt.data.json.errorCode == 0) ? `textFragments:\n${JSON.stringify(evt.data.json.textFragments, null, 4)}` : `Error: ${evt.data.json.errorText}`; 

  /*Event handler*/
  const ffilePdfFindHiddenText = e => {
    const file_reader = new FileReader();
    file_reader.onload = event => {
      /*Find hidden text in a PDF-file - Ask Web Worker*/
      AsposePDFWebWorker.postMessage({ "operation": 'AsposePdfFindHiddenText', "params": [event.target.result, e.target.files[0].name] }, [event.target.result]);
    };
    file_reader.readAsArrayBuffer(e.target.files[0]);
  };

Simple example:

  var ffilePdfFindHiddenText = function (e) {
    const file_reader = new FileReader();
    file_reader.onload = (event) => {
      /*Find hidden text in a PDF-file*/
      const json = AsposePdfFindHiddenText(event.target.result, e.target.files[0].name);
      if (json.errorCode == 0) document.getElementById('output').textContent = "JSON:\n" + JSON.stringify(json, null, 4);
      else document.getElementById('output').textContent = json.errorText;
    };
    file_reader.readAsArrayBuffer(e.target.files[0]);
  };