autocomplete select submit form

HTML

<link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css">
<script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
<label for="states">Enter State:</label>
<input id="states">
<button id="go">GO</button>
<div id="no-result" style="display: none;">State not found.</div>

JavaScript

$("#go").click(function () {
    btnGoClick();
});
$("#states").keypress(function (event) {
    if (event.which == 13) {
        event.preventDefault();
        btnGoClick();
    }
});

var defaultNoMatchUrl = "http://www.google.com";
var currentUrl = "";

$(function () {

    var stateList = [{
        "value": "Tennessee",
            "url": "http://www.tennessee.gov"
    }, {
        "value": "Texas",
            "url": "http://www.texas.gov"
    }, {
        "value": "Colorado",
            "url": "http://www.colorado.gov"
    }, {
        "value": "Connecticut",
            "url": "http://www.ct.gov"
    }];

    $("#states").autocomplete({
        source: stateList,
        autoFocus: true,
        minLength: 3,
        select: function (event, ui) {
            go(ui.item.url);
        },
        response: function (event, ui) {
            if (!ui.content.length) {
                $("#no-result").show();
                currentUrl = defaultNoMatchUrl;
            } else {
                $("#no-result").hide();
            }
        },
        focus: function (event, ui) {
            currentUrl = ui.item.url;
        }
    });
});

function go(url) {
    window.open(url);
}

function btnGoClick() {
    if (currentUrl !== "") go(currentUrl);
}