title: jQuery what is the 'ui' in the following example?
body: <p>chrisrbailey's comment on this question:</p>
  
  <p><a href="https://stackoverflow.com/questions/621147/jquery-ui-slider-cant-slide-to-0">jQuery UI slider - can&#39;t slide to 0</a></p>
  
  <p>helped me solve that exact same issue I was having with a slider. I'd like to extend that example into another question. Could someone help me understand the difference between these two examples:</p>
  
  <pre><code>$("#slider1").slider({
    slide:  function(event,ui){$('#field1').val(ui.value)}
  });
  
  $("#slider1").slider({
    slide:  function(event,ui){$('#field1').val($(this).slider("value"))}
  });
  </code></pre>
  
  <p>As the aforementioned question/answer indicates, ui.value and $(this).slider("value") are actually grabbing different things. I'm not used to the ui.value and was wondering if anyone had a good explanation/link to tutorial that talks more about using the 'event,ui' items in jQuery. </p>