Disable submit button until textarea ihas more than 100 chars
<p>How can I disable the submit button until the chars of a textarea are more than 100 chars? </p>

<p>This is a code used to check if the user has selected to upload an image. Please inform me how should I name my textarea and guide me through the installation of it.</p>

<pre><code>$(function() {
   $('form').submit(function() {
      if(!$("form input[type=file]").val()) {
         alert('You must select a file!');
         return false;
      }
   });
});
</code></pre>
