Stackoverflow Response: how can I set limit to checkbox selection using radio button values

http://stackoverflow.com/questions/16156088/how-can-i-set-limit-to-checkbox-selection-using-radio-button-values/16156544#16156544

HTML

<input type="radio" name="attending_days" value="06-18-13" checked="checked" />Tuesday June 18, 2013
<br>
<input type="radio" name="attending_days" value="06-19-13" />Wednesday June 19, 2013
<br>
<input type="radio" name="attending_days" value="both_days" />Both days
<br>

<div id="checkboxes">
  <input type="checkbox" name="checkboxes" value="1" />1
  <br />
  <input type="checkbox" name="checkboxes" value="2" />2
  <br />
  <input type="checkbox" name="checkboxes" value="3" />3
  <br />
  <input type="checkbox" name="checkboxes" value="4" />4
  <br />
  <input type="checkbox" name="checkboxes" value="5" />5
  <br />
  <input type="checkbox" name="checkboxes" value="6" />6
  <br />
  <input type="checkbox" name="checkboxes" value="7" />7
  <br />
  <input type="checkbox" name="checkboxes" value="8" />8
  <br />
  <input type="checkbox" name="checkboxes" value="9" />9
  <br />
  <input type="checkbox" name="checkboxes" value="10" />10
  <br />
  <input type="checkbox" name="checkboxes" value="11" />11
  <br />
  <input type="checkbox" name="checkboxes" value="12" />12
  <br />
  <input type="checkbox" name="checkboxes" value="13" />13
  <br />
  <input type="checkbox" name="checkboxes" value="14" />14
  <br />
  <input type="checkbox" name="checkboxes" value="15" />15
  <br />
  <input type="checkbox" name="checkboxes" value="16" />16
  <br />
  <input type="checkbox" name="checkboxes" value="17" />17
  <br />
  <input type="checkbox" name="checkboxes" value="18" />18
  <br />
  <input type="checkbox" name="checkboxes" value="19" />19
  <br />
  <input type="checkbox" name="checkboxes" value="20" />20
  <br />
</div>

JavaScript

$('input[name=checkboxes]').on('click', function() {
      var lastOneChecked = $('input[name=attending_days]:last:checked').length,
        iLimit = lastOneChecked ? 8 : 4,
        iChecked = $('input[name=checkboxes]:checked').length;

      if (iChecked > iLimit) {
        return false;
      }

      return true; // added so that anonymous function always returns something
    });

    $('input[name=attending_days]').on('click', function() {
      $('input[name=checkboxes]').prop('checked', false);
    });