title: How to get the saved value form my custom form field type in joomla?
body: <p>I have created my custom form field for a module.However, it work will but when ever i get back to the module i don't know what is the previous value or the saved value, because i didn't make it selected there. </p>
  
  <pre><code>&lt;?php
  // Check to ensure this file is included in Joomla!
  defined('_JEXEC') or die('Restricted access');
  
  jimport('joomla.form.formfield');
  
  class JFormFieldSlidercategory extends JFormField {
  
      protected $type = 'Slidercategory';
  
      // getLabel() left out
  
      public function getInput() {
  
                  $db = JFactory::getDBO();
                  $query = $db-&gt;getQuery(true);
                  $query-&gt;select('id,title');
                  $query-&gt;from('#__h2mslider_categories');
                  $db-&gt;setQuery((string)$query);
                  $messages = $db-&gt;loadObjectList();
                  $options ='';
  
  
                  if ($messages)
                  {
                          foreach($messages as $message) 
                          {
                                  $options .= '&lt;option value="'.$message-&gt;id.'" &gt;'.$message-&gt;title.'&lt;/option&gt;';
                          }
                  }
  
  
                  $options = '&lt;select id="'.$this-&gt;id.'" name="'.$this-&gt;name.'"&gt;'.
                         '&lt;option value="0" &gt;--select a category--&lt;/option&gt;'.
                         $options.
                         '&lt;/select&gt;';
  
                  return $options ;
  
  
      }
  }
  </code></pre>
  
  <p>I need the function that return me the saved value.</p>