JavaScript

Set a MIME Body, Preserving Content Headers

Demonstrates the Chilkat Mime.SetBody method, which sets the current part's body while preserving the existing content headers (Content-Type, charset, Content-Transfer-Encoding). The only argument is the body text; it is a void method.

Background: Unlike the SetBodyFrom... methods, which set both the content and the headers that describe it, SetBody replaces only the body text and leaves the existing Content-Type and encoding in place. That is what you want when the media type is already correct and you simply need to swap in new content — updating a templated part, for instance — without re-declaring its type.

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.SetBody method, which sets the current part's body while preserving the
//  existing content headers (Content-Type, charset, Content-Transfer-Encoding).  The only argument
//  is the body text.  It is a void method.

var mime = new CkMime();

//  Establish the content headers first.
success = mime.SetBodyFromPlainText("initial");
if (success == false) {
    console.log(mime.LastErrorText);
    return;
}

//  Replace just the body text, keeping the existing Content-Type and encoding.
mime.SetBody("This is the replacement body text.");

var mimeText = mime.GetMime();
if (mime.LastMethodSuccess == false) {
    console.log(mime.LastErrorText);
    return;
}

console.log(mimeText);