<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <input type="text" id="field" />
    <button id="myBtn">Go</button>

    <script type="text/javascript">
        document.getElementById("myBtn").addEventListener("click", function(){
            var url = document.getElementById("field").value;

            window.location.href = url;

            // OR

            window.open(url);
        });
    </script>
</body>
</html>