2018.2

Radio Button Group
A Radio Button Group is not an input element itself. Rather it is a group of Radio Buttons that
have the same submit name, indicating that they belong to the same group. Multiple Radio
Buttons in the same group only accept one option to be selected. Only the value of the selected
Radio Button will be sent to the server on submitting the form. If more options are to be allowed
at the same time you should use Checkboxes instead.
The option to add a Radio Button Group is only available in the Form Wizard; see "Forms" on
page619. You could also create a Radio Button Group by specifying the same submit name for
a number of Radio Buttons when adding them to a Form.
Radio Button
A radio button sends information to the server whether it is selected (true) or not (false). When
adding a Radio Button you can set its initial state and its value. The contents of the value
property do not appear in the user interface. If a Radio Button is in selected state when the form
is submitted, the name of the Radio Button is sent along with its value.
If a Radio Button is not checked, no information is sent when the form is submitted. Fortunately,
there is a workaround to submit the status of the unchecked radio button, see "Using Form
elements" on page477.
The submit name of a Radio Button indicates to which Radio Button Group the Radio Button
belongs.
Select
A Select element is a drop-down list with multiple entries from which the user can select only
one option. When adding a Select to a Form you can type the options to be given in the drop-
down list and the values related to them. Only the value of the selected option will be sent to the
server on submitting the form.
To learn how to dynamically add options to a Select element, see this how-to: to Dynamically
add options to a dropdown.
Button
The Button element is an element that can be clicked. When adding a Button to a Form you can
set the button's type:
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