title: File input: Compare file type and accept only picture formats (jpg, bmp, etc)
body: <p>I am currently trying ot find a way to use jquery to validate if a a file is in picture format <code>(jpeg,jpg,bmp,gif,etc)</code>. I have been able to figure out if the input is empty or not with simple <code>.length</code> comparison. How would I be able to check the file type and only accept valid picture formats.</p>
  
  <p><strong>Emtpy or not input:</strong></p>
  
  <pre><code>if ($.trim($('#textInput').val()).length == 0) {
      alert("Should Not Be Empty!");
  }
  </code></pre>