React Native

Get a Header Field by Name

Demonstrates the Chilkat Email.GetHeaderField method, which returns the value of a header field by name. Header-field names are case-insensitive, so X-Priority and x-priority refer to the same field. This example reads several headers by name.

Background: Looking up a header by name is the quickest way to read a known field like Subject or a custom X- header. One caveat: some header names (such as Received) can legitimately appear more than once. When a field may repeat and you need every occurrence, enumerate by index with GetHeaderFieldName and GetHeaderFieldValue instead of looking up by name.

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React Native

import { Email } from '@chilkat/react-native'

function chilkatExample() {
  // Demonstrates the GetHeaderField method, which returns the value of a header field by
  // name.  Header-field names are case-insensitive.

  const email = new Email();
  email.subject = 'Quarterly report';
  email.from = 'alice@example.com';
  email.addHeaderField('X-Priority', '1');

  // Get header field values by name.
  console.log(`Subject = ${email.getHeaderField('Subject')}`);
  console.log(`From = ${email.getHeaderField('From')}`);
  console.log(`X-Priority = ${email.getHeaderField('x-priority')}`);
}