Creating an item if not already exists in Selectize.js select box and ajax update the new added item

Question

I was using Selectize.js in a select box, What i need is, if an item is not in the list of options i would need to add a new item. When new item is added, i want to have an ajax

Answer 1

Thanks a lot, @Corgalore. Its working for me like
$(function(){
        $('#desig').selectize({
            create:function (input, callback){
                $.ajax({
                    url: "url(null, array('controller' => 'employee-detail', 'action' => 'add-new-desig-ajax'));?>",
                    type: 'POST',
                    data:{'designation':input},
                    success: function (result) {
                        if (result) {
//                            console.log('sdfasf',result);
                            callback({ value: result.id, text: input });
                        }
                    }
                });
            }
        });
    });