JSFiddle - React, Tailwind, and code Playground

by Mustafa Oeztuerk

HTML

<div class="set_partsInput">
         <div class="save_button" id="SaveUserName">fdsafasf</div>
         <div class="icon-contacts icon-contact-add-2"></div>
          <form method='post' action=''>
          <input type="text" name="full_name" class="inlet_portion" value="aaabbb"/>
          <span class="bar"></span>
          </form>
          </div>

CSS

.save_button {
   display:none; 
    
}

JavaScript

$('body').on('keyup', '.inlet_portion', function(event) {
	   event.preventDefault();
    var textarea_value = $(".inlet_portion").val();
    if (textarea_value != '') {
      $('.save_button').fadeIn();
    } else {
      $('.save_button').fadeOut();
    }
   });