Use onkeydown event to check backspace key trigger or not in JavaScript.
Trigger backspace event in JavaScript example
HTML example code has an input field, if the user pressed a backspace key it will popup an alert box.
The backspace key char is 8, so we will check the condition with the same value.
<!DOCTYPE html>
<html>
<body>
<input type="text" id="myInput">
<script>
var input = document.getElementById('myInput');
input.onkeydown = function() {
var key = event.keyCode || event.charCode;
if( key == 8 ){
alert(event.code + " " + key);
}
};
</script>
</body>
</html>Output:
Do comment if you have any doubts or suggestions on this JS event code.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version