jQueryUI 1.8.14 Autocomplete

HTML

<script src="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.14/jquery-ui.min.js"></script>
<link rel="stylesheet" href="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.14/themes/black-tie/jquery-ui.css">
<input type="text" id="auto" />
<span></span>

JavaScript

$("#auto").autocomplete({ 
    source: ['hi', 'bye', 'foo', 'bar'],
    change: function(event, ui) {
        console.log(this.value);
        if (ui.item == null) {
            $("span").text("new item: " + this.value);
        } else {
            $("span").text("selected item: " + ui.item.value);
        }
    }
});