1) How can i validate doubleList(right side selected list should not be empty) in javascript ?
Since you know the ID of the second
<select> box generated by the optiontransferselect tag, so you can use the
options property in javascript and if the options property is empty, it means that no option has been transferred by the user. I've not tried it but it should work
2) How can i get doubleList in action class?
I'm unsure what you mean here.
See the
optiontransferselect tag to get more details about the tag...