jQuery Tokeninput add if not exists

Question

I am in the process of writing a script that builds upon user input,

I have some fields that its values need to be quired from the database,

and if no entry fo

Answer 1

I have added some functionalities to SteveR's answer, because I wanted the value to appear at the top of the dropdown even if there are results. Also onAdd if the item selected does not exist in the databese I want to add it:

 $("#my_input").tokenInput(my_results_route), {
    hintText: "Select labels",
    noResultsText: "No results",
    searchingText: "Searching...",
    preventDuplicates: true,
    onResult: function(item) {
        if($.isEmptyObject(item)){
            return [{id:'0', name: $("tester").text()}];   
        } else {
            //add the item at the top of the dropdown
            item.unshift({id:'0', name: $("tester").text()});
            return item; 
        }
    },
    onAdd: function(item) {
        //add the new label into the database
        if(!parseInt(item.id)) {
            //database insertion ajax call
            console.log('Add to database');
        }
    }
});