When I tried adding a slash after the second character using the replace method, I found that I couldn't remove it afterwards.
When I tried adding a slash after the second character using the replace method, I found that I couldn't remove it afterwards.
To identify the pressed key, utilize event.key. If the key happens to be either Backspace or Delete, simply exit from the event handler without proceeding with the insertion of the /:
const input = document.querySelector('input');
input.addEventListener('keydown', () => {
if(event.key === 'Backspace' || event.key === 'Delete') {
return;
}
if(input.value.length === 2) input.value += '/';
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