JSFiddle - React, Tailwind, and code Playground

HTML

<input class="only-number" />

<input id="Name" />

CSS

.only-number{
    margin-bottom:10px;
}

JavaScript

$('.only-number').keyup(function(evt) {
		if( (evt.keyCode < 48 || evt.keyCode) > 57 && evt.keyCode != 8) return false;
	});
$('#Name').keyup(function(evt) {
		if((evt.keyCode < 97 || evt.keyCode > 122) && (evt.keyCode < 65 || evt.keyCode > 90) &&  (evt.keyCode != 32)&& (evt.keyCode != 46) &&  evt.keyCode != 8) return false;
	});