JSFiddle - React, Tailwind, and code Playground

HTML

<form action="" method="post" onSubmit="if (this.message.value == '') {return false;}">
    <textarea id="message" name="message" maxlength="35"></textarea>
    <input id="send" type="image" src="http://dl.dropbox.com/u/26827941/submit.png" value="Submit">
</form>

JavaScript

$(function(){
   
    $("#send").submit(function(e){
        
      if($("#message").val()==""))
      {      
        e.preventDefault();
       }
    });        
    
});