Html Form Multiple Selectbox using SumoSelect, mark required fields -

i using sumoselect, jquery dropdown, <select> fields in html form. how can mark them required when submitting form? native <select> fields notice chrome, firefox, etc. can replicate behavior?

this possible using jquery validation plugin:

$(sumoselectfieldselector).rules("add",{     required:true,     messages:{         required:"field required"         } })