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    <p>The beginning of your post is confusing: your sentence states "While onchange the state the cities should be viewed in check boxes. Below is my code" ~ the states should be checkboxes or a select?</p> <p>Either way, I have this as working code with states as a 'select' and cities as 'checkboxes':</p> <pre><code>function state_form($form, &amp;$form_state) { $form = array(); $form['rate_the_service']['state'] = array( '#type' =&gt; 'select', '#prefix'=&gt;'&lt;div id="dropdown-third-replace"&gt;', '#suffix'=&gt;'&lt;/div&gt;', '#options'=&gt;array( '0' =&gt; t('Ohio'), '1' =&gt; t('New York'), ), '#validated' =&gt; TRUE, '#ajax' =&gt; array( 'event' =&gt; 'change', 'callback' =&gt; 'ajax_example_dependent_dcheck_state_callback', 'wrapper' =&gt; 'checkboxes-four-replace', ), ); $city_array = array( '1' =&gt; array( '1' =&gt; 'Cincinnati', '2' =&gt; 'Cleveland', '3' =&gt; 'Toledo' ), '2' =&gt; array( '4' =&gt; 'New York City', '5' =&gt; 'Buffalo', '6' =&gt; 'Syracuse' ), ); if (isset($form_state['values']['state']) &amp;&amp; $form_state['values']['state'] == 1) { $form['rate_the_service']['city'] = array( '#prefix'=&gt;'&lt;div id="checkboxes-four-replace"&gt;', '#type' =&gt; 'checkboxes', '#options' =&gt; $city_array[2], '#default_value' =&gt; isset($values['city']) ? $values['city'] : array('1'), '#suffix'=&gt;'&lt;/div&gt;&lt;/div&gt;', ); } else { $form['rate_the_service']['city'] = array( '#prefix'=&gt;'&lt;div id="checkboxes-four-replace"&gt;', '#type' =&gt; 'checkboxes', '#options' =&gt; $city_array[1], '#default_value' =&gt; isset($values['city']) ? $values['city'] : array('2'), '#suffix'=&gt;'&lt;/div&gt;&lt;/div&gt;', ); } return $form; } /** * Ajax Callback for development_form */ function ajax_example_dependent_dcheck_state_callback($form, $form_state) { return $form['rate_the_service']['city']; } </code></pre> <p>Optionally, if you wanted state to be 'checkboxes' as well as cities, you could do this:</p> <pre><code>function state_form($form, &amp;$form_state) { $form = array(); $form['rate_the_service']['state'] = array( '#type' =&gt; 'checkboxes', '#prefix'=&gt;'&lt;div id="dropdown-third-replace"&gt;', '#suffix'=&gt;'&lt;/div&gt;', '#options'=&gt;array( 'ohio' =&gt; t('Ohio'), 'new_york' =&gt; t('New York'), ), '#validated' =&gt; TRUE, '#ajax' =&gt; array( 'event' =&gt; 'change', 'callback' =&gt; 'ajax_example_dependent_dcheck_state_callback', 'wrapper' =&gt; 'checkboxes-four-replace', ), ); $city_array = array( '1' =&gt; array( '1' =&gt; 'Cincinnati', '2' =&gt; 'Cleveland', '3' =&gt; 'Toledo' ), '2' =&gt; array( '4' =&gt; 'New York City', '5' =&gt; 'Buffalo', '6' =&gt; 'Syracuse' ), ); // refine as needed to fit your validation, if this is your use case if (isset($form_state['values']['state']['ohio']) &amp;&amp; $form_state['values']['state']['ohio'] == 'ohio') { $form['rate_the_service']['city'] = array( '#prefix'=&gt;'&lt;div id="checkboxes-four-replace"&gt;', '#type' =&gt; 'checkboxes', '#options' =&gt; $city_array[1], '#default_value' =&gt; isset($values['city']) ? $values['city'] : array('1'), '#suffix'=&gt;'&lt;/div&gt;&lt;/div&gt;', ); } else if (isset($form_state['values']['state']['new_york']) &amp;&amp; $form_state['values']['state']['new_york'] == 'new_york') { $form['rate_the_service']['city'] = array( '#prefix'=&gt;'&lt;div id="checkboxes-four-replace"&gt;', '#type' =&gt; 'checkboxes', '#options' =&gt; $city_array[2], '#default_value' =&gt; isset($values['city']) ? $values['city'] : array('2'), '#suffix'=&gt;'&lt;/div&gt;&lt;/div&gt;', ); } else { $form['rate_the_service']['city'] = array( '#prefix'=&gt;'&lt;div id="checkboxes-four-replace"&gt;', '#type' =&gt; 'checkboxes', '#options' =&gt; array(), '#default_value' =&gt; isset($values['city']) ? $values['city'] : array('2'), '#suffix'=&gt;'&lt;/div&gt;&lt;/div&gt;', ); } return $form; } /** * Ajax Callback for development_form */ function ajax_example_dependent_dcheck_state_callback($form, $form_state) { return $form['rate_the_service']['city']; } </code></pre> <p>and here is the case with states as a 'select' box and cities as a 'select' box</p> <pre><code>function state_form($form, &amp;$form_state) { $form = array(); $form['rate_the_service']['state'] = array( '#type' =&gt; 'select', '#prefix'=&gt;'&lt;div id="dropdown-third-replace"&gt;', '#suffix'=&gt;'&lt;/div&gt;', '#options'=&gt;array( 'ohio' =&gt; t('Ohio'), 'new_york' =&gt; t('New York'), ), '#validated' =&gt; TRUE, '#ajax' =&gt; array( 'event' =&gt; 'change', 'callback' =&gt; 'ajax_example_dependent_dcheck_state_callback', 'wrapper' =&gt; 'checkboxes-four-replace', ), ); $city_array = array( '1' =&gt; array( '1' =&gt; 'Cincinnati', '2' =&gt; 'Cleveland', '3' =&gt; 'Toledo' ), '2' =&gt; array( '4' =&gt; 'New York City', '5' =&gt; 'Buffalo', '6' =&gt; 'Syracuse' ), ); if (isset($form_state['values']['state']) &amp;&amp; $form_state['values']['state'] == 'new_york') { $form['rate_the_service']['city'] = array( '#prefix'=&gt;'&lt;div id="checkboxes-four-replace"&gt;', '#type' =&gt; 'select', '#options' =&gt; $city_array[2], '#default_value' =&gt; isset($values['city']) ? $values['city'] : array('1'), '#suffix'=&gt;'&lt;/div&gt;&lt;/div&gt;', ); } else { $form['rate_the_service']['city'] = array( '#prefix'=&gt;'&lt;div id="checkboxes-four-replace"&gt;', '#type' =&gt; 'select', '#options' =&gt; $city_array[1], '#default_value' =&gt; isset($values['city']) ? $values['city'] : array('2'), '#suffix'=&gt;'&lt;/div&gt;&lt;/div&gt;', ); } return $form; } /** * Ajax Callback for development_form */ function ajax_example_dependent_dcheck_state_callback($form, $form_state) { return $form['rate_the_service']['city']; } </code></pre>
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