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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Prevent return key should not submit form</title>
<script type="application/javascript">
function init() {
let input = document.getElementById("input");
input.addEventListener("keydown", function(aEvent) {
if (aEvent.keyCode == 13) { // return key
alert("Hello!");
aEvent.preventDefault();
return false;
}
return true;
}, {once: true});
let form = document.getElementById("form");
form.addEventListener("submit", function() {
let result = document.getElementById("result");
result.innerHTML = "submitted";
}, {once: true});
}
</script>
</head>
<body onload="init()">
<form id="form">
<input type="text" id="input">
<button type="submit" id="submitBtn">Submit</button>
</form>
<p id="result">not submitted</p>
</body>
</html>