Q: How do you handle backspace navigation in an OTP input?

On keydown, if the key is Backspace and the current input is empty (!e.target.value) and it is not the first input, focus the previous input: if (e.key === 'Backspace' && !e.target.value && index > 0) inputs[index - 1].focus().

Question 1

How do you show a numeric keyboard on mobile for OTP input?

Accepted Answer

Set inputmode='numeric' on the input element. This tells mobile browsers to show a numeric keyboard instead of the full keyboard. Also set pattern='[0-9]*' for older browsers.

Question 2

How do you implement auto-focus in an OTP input in JavaScript?

Accepted Answer

On the input event, if a value was entered and it is not the last input, focus the next input: if (value && index < inputs.length - 1) inputs[index + 1].focus(). This moves the cursor forward automatically.

Question 3

How do you handle backspace navigation in an OTP input?

Accepted Answer

On keydown, if the key is Backspace and the current input is empty (!e.target.value) and it is not the first input, focus the previous input: if (e.key === 'Backspace' && !e.target.value && index > 0) inputs[index - 1].focus().

Question 4

Should you add arrow key navigation to an OTP input?

Accepted Answer

Yes. Arrow Left and Arrow Right let the user navigate between inputs without typing. This improves UX for correction. On keyup, if ArrowLeft and index > 0, focus previous. If ArrowRight and not last, focus next.

How do you show a numeric keyboard on mobile for OTP input?

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