JavaScript

Create a multipart/alternative MIME Entity

Demonstrates the Chilkat Mime.NewMultipartAlternative method, which initializes the object as an empty multipart/alternative entity. It takes no arguments; the alternative representations are then appended.

Background: multipart/alternative holds several renderings of the same content and lets the client pick the best one it can display — the standard way to send an email as both plain text and HTML. Order matters: parts go from least to most preferred, so the plain-text version comes first and the HTML last, and a client shows the last one it understands.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

JavaScript

var success = false;

//  Demonstrates the Mime.NewMultipartAlternative method, which initializes the object as an empty
//  multipart/alternative entity, clearing any existing content.  It takes no arguments.

var mime = new CkMime();

success = mime.NewMultipartAlternative();
if (success == false) {
    console.log(mime.LastErrorText);
    return;
}

//  multipart/alternative holds two representations of the SAME content; the client displays the
//  last one it can render.  Add a plain-text part, then an HTML part.
var textPart = new CkMime();
success = textPart.SetBodyFromPlainText("Hello (plain text version).");
if (success == false) {
    console.log(textPart.LastErrorText);
    return;
}

success = mime.AppendPart(textPart);
if (success == false) {
    console.log(mime.LastErrorText);
    return;
}

var htmlPart = new CkMime();
success = htmlPart.SetBodyFromHtml("<html><body><b>Hello</b> (HTML version).</body></html>");
if (success == false) {
    console.log(htmlPart.LastErrorText);
    return;
}

success = mime.AppendPart(htmlPart);
if (success == false) {
    console.log(mime.LastErrorText);
    return;
}

console.log("Number of alternatives: " + mime.NumParts);