InsertSubTextPart.js

function InsertSubTextPart(name, protect) {
 	// retrieve the JS Selection object
	var sel = TXTextControl.selection

	// check, if something has been selected
	sel.getBounds(function (e) {
		if (e.length == 0) {
			alert('SubTextPart cannot be added - please select text.');
			return;
		}
		else {
   			// save the current selection
			TXTextControl.saveSelection(
				TXTextControl.streamType.InternalUnicodeFormat,
				function (e) {

					var serviceURL = "/Home/InsertSubTextPart";

					$.ajax({
						type: "POST",
						url: serviceURL,
						contentType: 'application/json',
						data: JSON.stringify({
							Name: name,
							BinaryDocument: e.data,
							Protected: protect
						}),
						success: successFunc,
						error: errorFunc
					});

					function successFunc(data, status) {
						// load the created SubTextPart into the current Selection
						TXTextControl.loadSelection(
							TXTextControl.StreamType.InternalUnicodeFormat, data);
					}

					function errorFunc() {
						alert('Error');
					}
				});
		}
	})
}