if (e.which == 13) ?
<div class="ui-widget"> <label for="tags">Tags: </label> <input id="tags" /> </div>
var sectionAdata = ["ActionScript","AppleScript","Asp"];
$("#tags").on('keyup', function (e) { if(e.which == 13) alert("send to section B" + this.value); }).autocomplete({ source: availableTags, select: function (event, ui) {} });