enabled

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

<input id="number" />
<script type="text/javascript">
    $(function () {
        $("#number").shieldNumericTextBox({
            enabled: false  // initially disabled
        });

        console.log($("#number").swidget().enabled());  // prints false
  
        $("#number").swidget().enabled(true);  // enables the widget
  
        console.log($("#number").swidget().enabled());  // prints true
    });
</script>