The input slot that will be used to access the value.
label
Display label for the control, or NULL for no label.
choices
List of values to select from (if elements of the list are
named then that name rather than the value is displayed to the user)
selected
The initially selected value (if not specified then
defaults to the first value)
inline
If TRUE, render the choices inline (i.e. horizontally)
width
The width of the input, e.g. '400px', or '100%';
see validateCssUnit.
Value
A set of radio buttons that can be added to a UI definition.
Details
If you need to represent a "None selected" state, it's possible to default
the radio buttons to have no options selected by using
selected = character(0). However, this is not recommended, as it gives
the user no way to return to that state once they've made a selection.
Instead, consider having the first of your choices be c("None selected"
= "").