test.js

function submitform() {

    // validate forms
    var valid = TXDocumentViewer.forms.validate();

    if (valid === false) { // not valid
        $('.alert-info').text(
            "Document contains invalid form fields.").show().delay(5000).fadeOut();
        return;
    }

    // -> valid

    // get the form values
    var formsJson = JSON.stringify(TXDocumentViewer.forms.getValues());

    // send values to controller
    var serviceURL = "@Url.Action("FormValues", "Home", new { username = Model.Username })";

    $.ajax({
        type: "POST",
        url: serviceURL,
        contentType: 'application/json',
        data: formsJson,
        success: successFunc,
        error: errorFunc
    });

    function successFunc(data, status) {
        $('.alert-info').text(
            "Thanks. Your document has been submitted!").show().delay(5000).fadeOut();
        TXDocumentViewer.downloadDocument(TXDocumentViewer.StreamType.AdobePDF, true);
    }

    function errorFunc() {
        $('.alert-info').text("Oops! There was an error.").show().delay(5000).fadeOut();
    }
}