Try putting input inside a form tag, and submitting the form instead of the input tag
...
<body>
<form id="CityForm" onsubmit="u()" action="/" method="post">
<input id="City" placeholder="EnterCity" />
</form>
</body>
<script>
function u(){
document.getElementById("City").addEventListener("keyup", function(event) {
if (event.keyCode === 13) {
var x = document.getElementById("CityForm");
x.submit();
return false;
}
});
}
</script>
...
You submit form's, not individual input elements. On your input element you can have an action like onChange which will run every time the input tag get's input, but the actual submission is handled by the form
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