JSFiddle - React, Tailwind, and code Playground

by Joe

HTML

<form method="post">
  <textarea name="postes" id="textAreaPost" placeholder="Write what's you new" maxlength="500"></textarea>

  <span id="char_namb" style="padding: 4px; float: right; font-size: 20px; font-family: Cocon; text-align: center;">500 : 0</span>
</form>

JavaScript

$(function(){
    $('#textAreaPost').keyup(function(){
      var charsno = $(this).val().length;
      $('#char_namb').html("500 : " + charsno);
    });
});