html input only 4 digits
<input type="text" name="pincode" maxlength="4" id="pin" pattern="^0[1-9]|[1-9]\d$" required/>html input only 4 digits
<input type="text" name="pincode" maxlength="4" id="pin" pattern="^0[1-9]|[1-9]\d$" required/>make only one digit input box
<input type="text" maxlength="1" oninput="this.value=this.value.replace(/[^0-9]/g,'');" />Copyright © 2021 Codeinu
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