JSFiddle - React, Tailwind, and code Playground

by Filipe Augusto Lima de Souza

HTML

<form>
<input type="text" id="number"value="" />
<input type="submit" onclick="return validateNumber();"/> 
</form>

JavaScript

function validateNumber()
{
   var number = $('#number').val();
   var cnumber = parseFloat(number);
   alert(number)
   
   if(isNaN(cnumber))
   {
    alert("only number");
    return false;
   }
   return true;
 }