title: Show alert if no check box is selected
body: <p>I have a table and I need to show an alert if no check box is selected. </p>
  
  <p>Below is the table structure</p>
  
  <pre><code>&lt;table id="mytable"&gt;
    &lt;tr&gt;&lt;td&gt;&lt;input type="checkbox" name="one" value="1" /&gt;&lt;/td&gt;&lt;/tr&gt;
    &lt;tr&gt;&lt;td&gt;&lt;input type="checkbox" name="two" value="2" /&gt;&lt;/td&gt;&lt;/tr&gt;
    &lt;tr&gt;&lt;td&gt;&lt;input type="checkbox" name="three" value="3" /&gt;&lt;/td&gt;&lt;/tr&gt;
  &lt;/table&gt;
  </code></pre>
  
  <p>Please guide me how can I achieve this?</p>