JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="text" id="custName-info" />

JavaScript

$("#custName-info").keypress(function (event) {
            var inputValue = event.charCode;
            if (!(inputValue >= 65 && inputValue <= 120) && (inputValue != 32 && inputValue != 0)) {
                event.preventDefault();
            }
        });