JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="test" maxlength="14" name="test" onkeypress="return isNumber(event)" />

JavaScript

function isNumber(event) {
    event = (event) ? event : window.event;
    var charCode = (event.which) ? event.which : event.keyCode;
    if (charCode > 31 && (charCode < 48 || charCode > 57)) {
        return false;
    }
    return true;
}