entry(default="", label=as.character(NA), length=38, eval="key")"".38."key" - update on every keystroke (the default),
"focus" - update when the entry loses focus, or
"return" - updatetwiddlerControl.entry creates a text entry field twiddlerControl for manipulating a
string variable. The variable is updated on each keypress or when the input focus enters
or leaves the text field. See the eval parameter for details.twiddle