JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="textbox1">

JavaScript

$("#textbox1").keydown(function(event) {
					try 
					{
						if (event.keyCode >= 48 && event.keyCode <= 57)
						{
							alert("valid number");
						}   
						else
						{
							event.preventDefault();
							alert("It's NAN");
						}
					}
					catch(ex) {
						alert('An error occurred and I need to write some code to handle this!');
					}
					event.preventDefault();    
				});