How do you build an OTP input component in JavaScript?
Create multiple input elements with maxlength=1. Add event listeners: input (auto-focus next, numeric only), keydown (backspace to previous), paste (fill multiple boxes), and keyup (arrow key navigation). Enable the verify button when all inputs are filled.
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Listen for the paste event, prevent default, get the pasted text from clipboardData, filter to numeric only, and split each character across the input boxes starting from the current index. Focus the last filled input.
Listen for keydown. If the key is Backspace and the current input is empty, focus the previous input. This lets the user go back to correct a digit without clicking.
On the input event, replace non-numeric characters: e.target.value = e.target.value.replace(/\D/g, ''). Also set inputmode='numeric' on the input for mobile keyboards.
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