private Double getUiValue() {
        String v = JQMCommon.getVal(input.getElement().getId());
        if (v == null || v.isEmpty()) return null;
        return Double.valueOf(v);
    }
private Double getUiValue ( ) { String v = JQMCommon . getVal ( input . getElement ( ) . getId ( ) ) ; if ( v == null || v . isEmpty ( ) ) return null ; return Double . valueOf ( v ) ; }
@return - null if slider is not created/initialized/attached yet and therefore have no UI value.