Backspace key char is 8 and key is “Backspace”. Use onkeydown event and e.preventDefault() to disable the backspace key.
Prevent Backspace key in JavaScript Example
HTML example code:
<!DOCTYPE html>
<html>
<body>
<input type="text" id="myInput">
<script>
window.onkeydown = function (event) {
if (event.which == 8) {
event.preventDefault(); // turn off browser transition to the previous page
alert("NOT ALLOWED");
} };
</script>
</body>
</html>Output:
Do comment if you have any doubts or suggestions on this JS code.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version