Dart

Add an HTML Alternative Body to an Email

Demonstrates the Chilkat Email.AddHtmlAlternativeBody method, which adds an HTML alternative body. Combined with a plain-text body, it produces a multipart/alternative email that offers both representations of the same content. This example sets a plain-text body, adds an HTML alternative, and prints the resulting alternative count.

Background: A well-formed HTML email usually ships two versions of the body: a rich HTML version and a plain-text fallback, wrapped in a multipart/alternative container. The receiving client displays whichever it prefers — modern clients show the HTML, while text-only clients (or spam filters and accessibility tools) use the plain text. Providing both improves deliverability and ensures every recipient can read the message.

Chilkat Dart Downloads

Download Chilkat for Dart

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the AddHtmlAlternativeBody method, which adds an HTML alternative body to
  // the email.  Combined with a plain-text body, this produces a multipart/alternative
  // email that offers both representations.

  final email = CkEmail();
  email.subject = 'Plain-text and HTML alternatives';

  // Start with a plain-text body.
  email.setTextBody('This is the plain-text version of the message.', 'text/plain');

  // Add an HTML alternative, creating a multipart/alternative email.
  email.addHtmlAlternativeBody('<html><body><b>This is the HTML version.</b></body></html>');

  print('NumAlternatives = ${email.numAlternatives}');
}