JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text"></input>

JavaScript

function isNumber(n){
  return (parseFloat(n) == n);
}

$("document").ready(function(){
    $("input").keyup(function(event){
        var input = $(this).val();
        if(!isNumber(input)){
           
            $(this).val(input.substring(0, input .length-1));
        }
    });
});