React Native Requires Chilkat v11.7.0+

Get the Text Block Below a PDF Caption

See more PDF Text Extraction Examples

Demonstrates the "label" option with labelValue "below", which captures the block of text directly under a caption such as "Ship To", ending at the next gap or heading. Combined with layout "lines", the lines of an address block are kept separate. 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 packing slip used in this example is available at packing_slip.pdf

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

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

  // The packing slip has the captions "Bill To" and "Ship To" side by side,
  // each with an address block below it.
  json.updateString('label', 'Ship To');

  // "below" means the value is the block of text directly under the label.
  json.updateString('labelValue', 'below');

  // With the default "flow" layout the lines of the block would be joined into one paragraph.
  // "lines" keeps each line of the address on its own line.
  json.updateString('layout', 'lines');

  try {
    pdf.extractText('text', json, jsonOut);
  } catch {
    console.log(pdf.lastErrorText);
    return;
  }

  console.log('Ship To:');
  console.log(jsonOut.stringOf('text'));
  console.log('');

  json.updateString('label', 'Bill To');
  try {
    pdf.extractText('text', json, jsonOut);
  } catch {
    console.log(pdf.lastErrorText);
    return;
  }

  console.log('Bill To:');
  console.log(jsonOut.stringOf('text'));
  console.log('');

  // A caption over a short paragraph works the same way.  Here the flow layout is better,
  // because the two lines are one piece of text.
  json.updateString('label', 'Special Instructions');
  json.updateString('layout', 'flow');
  try {
    pdf.extractText('text', json, jsonOut);
  } catch {
    console.log(pdf.lastErrorText);
    return;
  }

  console.log('Special Instructions:');
  console.log(jsonOut.stringOf('text'));

  // Sample output:

  // Ship To:
  // Frank Delgado
  // c/o Harbor Pet Boarding
  // 9 Ferry Lane
  // Portside, WA 98001
  // 
  // Bill To:
  // Frank Delgado
  // Apartment 3B
  // 41 Mill Street
  // Portside, WA 98000
  // 
  // Special Instructions:
  // Leave the carton with the boarding office if no one answers. Do not leave it outside; the cat tree is not packed for rain.
}