JSFiddle - React, Tailwind, and code Playground

HTML

<div id="plugInDemo" class="vMarginLarge">
	<h4>Demo of the plug-in	</h4>
	<div id="demoFields" class="marginSmall">
		<div class="vMarginSmall">
			<div>Any Number</div>
			<div>
				<input type="text" id="anyNumber" />
			</div>
		</div>
	</div>
</div>

JavaScript

//	Author: Joshua De Leon - File: numericInput.js - Description: Allows only numeric input in an element. - If you happen upon this code, enjoy it, learn from it, and if possible please credit me: www.transtatic.com
(function(b){var c={allowFloat:false,allowNegative:false};b.fn.numericInput=function(e){var f=b.extend({},c,e);var d=f.allowFloat;var g=f.allowNegative;this.keypress(function(j){var i=j.which;var h=b(this).val();if(i>0&&(i<48||i>57)){if(d==true&&i==46){if(g==true&&a(this)==0&&h.charAt(0)=="-"){return false}if(h.match(/[.]/)){return false}}else{if(g==true&&i==45){if(h.charAt(0)=="-"){return false}if(a(this)!=0){return false}}else{if(i==8){return true}else{return false}}}}else{if(i>0&&(i>=48&&i<=57)){if(g==true&&h.charAt(0)=="-"&&a(this)==0){return false}}}});return this};function a(d){if(d.selectionStart){return d.selectionStart}else{if(document.selection){d.focus();var f=document.selection.createRange();if(f==null){return 0}var e=d.createTextRange(),g=e.duplicate();e.moveToBookmark(f.getBookmark());g.setEndPoint("EndToStart",e);return g.text.length}}return 0}}(jQuery));

$(function() {
   $("#anyNumber").numericInput({ allowFloat: true, allowNegative: true });
});