<!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>