React Native Requires Chilkat v11.7.0+

Exclude or Include Running Headers and Page Numbers

See more PDF Text Extraction Examples

Demonstrates the "repeatedHeadersFooters" filter. Text repeated at the same position on most pages, such as a running header and "Page N of 4" footers, is left out by default; set the filter to "include" to keep it. React Native

import { JsonObject, Pdf } from '@chilkat/react-native'

function chilkatExample() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  // The four-page PDF used in this example is available at running_header.pdf

  const pdf = new Pdf();
  try {
    pdf.loadFile('qa_data/pdf/running_header.pdf');
  } catch {
    console.log(pdf.lastErrorText);
    return;
  }

  const json = new JsonObject();
  const jsonOut = new JsonObject();

  // Every page has the header "Harbor Lighthouse Society - Annual Report 2026" at the top right
  // and "Page N of 4" at the bottom.  By default both are excluded, so the text of page 2 is just
  // its heading and paragraphs.
  json.updateString('pages', '2');
  try {
    pdf.extractText('text', json, jsonOut);
  } catch {
    console.log(pdf.lastErrorText);
    return;
  }

  console.log('---- default (repeated headers and footers excluded) ----');
  console.log(jsonOut.stringOf('text'));

  // Include them.  The detection looks at the neighbouring pages even when only one page is
  // selected, so a single page extracted on its own still loses its running head by default.
  json.updateString('repeatedHeadersFooters', 'include');
  try {
    pdf.extractText('text', json, jsonOut);
  } catch {
    console.log(pdf.lastErrorText);
    return;
  }

  console.log('---- repeatedHeadersFooters: include ----');
  console.log(jsonOut.stringOf('text'));

  // Sample output:

  // ---- default (repeated headers and footers excluded) ----
  // The Work
  // 
  // The restoration society took ownership in 2021 with three goals: make the structure watertight, return the tower to public access, and relight the lantern with a historically accurate lens. The first two were met in the second season, and the lens arrived on loan in November.
  // 
  // The spiral stair is original and is the most fragile part of the building. Twelve of the ninety-one treads were cracked or missing, and the central column had corroded badly at the second landing. The treads were cast from patterns taken off an intact tread.
  // ---- repeatedHeadersFooters: include ----
  // Harbor Lighthouse Society - Annual Report 2026
  // 
  // The Work
  // 
  // The restoration society took ownership in 2021 with three goals: ...
  // 
  // The spiral stair is original and is the most fragile part of the building. ...
  // 
  // Page 2 of 4
}