JSFiddle - React, Tailwind, and code Playground

by dave r

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<input type="text" id="txtNumero"/>

JavaScript

$(function(){
  $('#txtNumero').focusout(function(){
  	if($('#txtNumero').val()=="0"){
    	$('#txtNumero').val("1");
    }
  })
})