title: uncheck checkbox with same classname in jquery doesn't work
body: <p>I used jquery to set the checked/unchecked the checkboxes with same class name. I searched web at <a href="https://stackoverflow.com/questions/15044340/jquery-set-checkbox-checked">jquery set checkbox checked</a>. I tried to using prop and attr too. However it doesn't work for me, but I can disable the checkbox. Would someone tell me what I missing. </p>
  
  <p>There is the jquery I used:</p>
  
  <pre><code> &lt;script language="javascript" src="jquery-2.1.4.js" type="text/javascript"&gt;&lt;/script&gt;
  &lt;script language="javascript" src="jquery-ui-1.11.4/jquery-ui.js" type="text/javascript"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>There are the checkbox in page:</p>
  
  <pre><code>&lt;asp:CheckBox ID="chkOne" runat="server" Text="One"  CssClass="optionsBoxes"/&gt;
  &lt;asp:CheckBox ID="chkTwo" runat="server" Text="Two"  CssClass="optionsBoxes"/&gt;
  &lt;asp:CheckBox ID="chkThree" runat="server" Text="Three"  CssClass="optionsBoxes"/&gt;
  &lt;asp:CheckBox ID="chkFour" runat="server" Text="Four"  CssClass="optionsBoxes"/&gt;
  </code></pre>
  
  <p>My jquery:</p>
  
  <pre><code>$('.optionsBoxes').attr('checked', false);    
  $('.optionsBoxes').prop('checked', true);                  
  $('.optionsBoxes').attr('disabled', true);  //worked
  </code></pre>