title: Can I use jQuery to check whether at least one checkbox is checked?
body: <p>I have the following HTML form which can have many checkboxes. When the submit button is clicked, I want the user to get a javascript alert to check at least one checkbox if none are checked. Is there an easy way to do this using jQuery?</p>
  
  <pre><code>&lt;form name = "frmTest" id="frmTest"&gt;
    &lt;input type="checkbox" value="true" checked="true" name="chk[120]"&gt;
    &lt;input type="checkbox" value="true" checked="true" name="chk[128]"&gt;
    &lt;input type="checkbox" name="chk[130]"&gt;
    &lt;input type="checkbox" name="chk[143]"&gt;
    &lt;input type="submit" name="btnsubmit" value="Submit"&gt;
  &lt;/form&gt;
  </code></pre>