Source for file WCallbackButton.class.php

<?php
/**
 * @since Jul 20, 2005
 * @package polyphony.wizard.components
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: WCallbackButton.class.php,v 1.2 2007/09/19 14:04:51 adamfranco Exp $
 */ 
 
/**
 * This class simply evaluates its event as a callback function when pressed.
 * 
 * @since Jul 20, 2005
 * @package polyphony.wizard.components
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: WCallbackButton.class.php,v 1.2 2007/09/19 14:04:51 adamfranco Exp $
 */
class WCallbackButton 
    extends WEventButton
{
    
    
    
    /**
     * Tells the wizard component to update itself - this may include getting
     * form post data or validation - whatever this particular component wants to
     * do every pageload.
     * @param string $fieldName The field name to use when outputting form data or
     *  similar parameters/information.
     * @access public
     * @return boolean - TRUE if everything is OK
     */
    function update ($fieldName) {
        $val = RequestContext::value($fieldName);
        if ($val) {
            return eval($this->_event);
        }
        return true;
    }
    
    
    
}
 
?>