behavior: radio

Standard radio button implementation. Can be applied to any group of elements having the same name to achieve one-of-group checked functionality.

Elements

that have this behavior applied by default:

• <input type="radio"> - standard HTML inline radio button;
• <button type="radio"> - inline radio button, use it as <button|radio(group)>first</button> <button|radio(group)>second</button>.

Attributes

that this behavior knows about:

• checked - if provided will initialize value of runtime state of the flag checked.
• name="groupname" - standard attribute name has special meaning for the radio: radio buttons with the same name constitute single group.
• value="..." - standard value attribute (used by behavior:form).
• as="string | integer | float | numeric | auto" - defines how value attribute is reported to script. By default value of element with value="42" will be just as a string "42" but value="42" as="integer" will yield integer 42.

Events

Aside of standard set of events (mouse, keyboard, focus) behavior:radio generates:

• BUTTON_STATE_CHANGED event - the button just changed its state to checked. Asynchronous event.
• BUTTON_PRESS event - mouse down or spacebar key down when button is in focus. Synchronous event.

Value

true/false, reflects current status of :checked state flag.

Note: behavior:form treats all radio elements of the group as a single value.