JavaScript

Check if a MIME Part is Text

Demonstrates the Chilkat Mime.IsText method, which returns whether the Content-Type begins with text/. It takes no arguments and applies to the current part.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: IsText is the broad check for any textual part — text/plain, text/html, text/xml, and so on — which is what decides whether it is safe to decode the body to a string. For binary parts, decode to bytes instead. Use the narrower predicates when you need the exact text subtype.

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.IsText method, which returns whether the Content-Type begins with text/.  It takes no arguments and applies to the current
//  part.  This example iterates the parts of a multipart message and reports which ones match.

var mime = new CkMime();
success = mime.LoadMimeFile("qa_data/multipart_message.eml");
if (success == false) {
    console.log(mime.LastErrorText);
    return;
}

var n = mime.NumParts;
var part = new CkMime();
var i;
for (i = 0; i <= n - 1; i++) {
    success = mime.PartAt(i,part);
    if (success == false) {
        console.log(mime.LastErrorText);
        return;
    }

    if (part.IsText()) {
        console.log("Part " + i + " (" + part.ContentType + ") is text.");
    }

}