title: I need help making the submit button only appear when you have typed in the text box
body: <p>I'm using html and I have a text box and I also have the submit button but I only want the button to appear when you have typed text into the text box. I also have a lot of php in my scripts you its fine if you do it with that.</p>
  
  <p>I've tried different on click events and I've searched everywhere but i can't find anything. I know this is probably a simple question but I'm completely stuck.</p>
  
  <pre><code>&lt;div class = "profileLeftSideContent"&gt;
  
  &lt;form action="&lt;?php echo $username; ?&gt;" method="post"&gt;
  
  &lt;textarea id="post" name="post" rows="15" cols="40" placeholder="Bio goes 
  here..."&gt;
  &lt;/textarea&gt;
  
  &lt;input id="buddon" type="submit" name="send" 
  value="Save" style="background-color: #DCE5EE; border: 3px solid #666; 
  color:#666; height: 65px; width: 73px;"&gt;
  
      &lt;/form&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I want the button named save to only appear when you have typed in the above text area. (note, there is more code than this and the text box and button show up fine normally)</p>