title: Show button if input is not empty
body: <p>I am not much of a JavaScript guru, so I would need help with a simple code.
  I have a button that clears the value of an input field. </p>
  
  <p>I would like it (the button) to be hidden if input field is empty and vice versa (visible if there is text inside the input field).</p>
  
  <p>The solution can be pure JavaScript or jQuery, it doesn't matter. The simpler, the better.</p>