The extended 'required' method of validatebox component can be achieved as below:
$.extend($.fn.validatebox.methods, {
required: function(jq, required){
return jq.each(function(){
var opts = $(this).validatebox('options');
opts.required = required != undefined ? required : true;
$(this).validatebox('validate');
})
}
})
Usage example:
$('#WX').combobox('required', false); // disable required validation
$('#WX').combobox('required'); // enable required validation