The enabled() method, called without any parameters, will return the current enabled state of a RadioButton element.
The enabled(bool) method is used to update a RadioButton’s enabled/disabled state. Passing true will enable and false will disable the widget.

<input id="radiobutton" type="radio" ></div>

<script type="text/javascript">
    $(function () {
            label: "radiobutton 1",
            enabled: false

    $("#radiobutton").swidget().enabled(); // return false

    $("#radiobutton").swidget().enabled(true) // enable the widget

    $("#radiobutton").swidget().enabled(); // return true