JavaScript » Radio » checked

Syntax:

object.checked

This property, which is by default tainted, is a Boolean value which reflects whether a particular radio button has been selected, returning true if it has and false if not. As only one radio button in a set can be selected at any one time, it follows that if the select property of one is true, then that property for the others of that set is false. The checked property can be set at any time and the change is immediately reflected in the display.