function definition() {

global $COURSE;

$mform =& $this->_form;

$mform->addElement('text', 'name', get_string('groupselectname', 'groupselect'), array('size'=>'64'));

$mform->setType('name', PARAM_TEXT);

$mform->addRule('name', null, 'required', null, 'client');

$mform->addElement('htmleditor', 'intro', get_string('intro', 'groupselect'));

$mform->setType('intro', PARAM_RAW);

$mform->addRule('intro', get_string('required'), 'required', null, 'client');

$mform->setHelpButton('intro', array('questions', 'richtext'), false, 'editorhelpbutton');

$options = array();

$options[0] = get_string('fromallgroups', 'groupselect');

if ($groupings = groups_get_all_groupings($COURSE->id)) {

foreach ($groupings as $grouping) {

$options[$grouping->id] = format_string($grouping->name);

}

}

$mform->addElement('select', 'targetgrouping', get_string('targetgrouping', 'groupselect'), $options);

$mform->addElement('passwordunmask', 'password', get_string('password', 'groupselect'), 'maxlength="254" size="24"');

$mform->setType('password', PARAM_RAW);

$mform->addElement('text', 'maxmembers', get_string('maxmembers', 'groupselect'), array('size'=>'4'));

$mform->setType('maxmembers', PARAM_INT);

$mform->setDefault('maxmembers', 0);

$mform->addElement('date_time_selector', 'timeavailable', get_string('timeavailable', 'groupselect'), array('optional'=>true));

$mform->setDefault('timeavailable', 0);

$mform->addElement('date_time_selector', 'timedue', get_string('timedue', 'groupselect'), array('optional'=>true));

$mform->setDefault('timedue', 0);

$features = array('groups'=>true, 'groupings'=>true, 'groupmembersonly'=>true,

'outcomes'=>false, 'gradecat'=>false, 'idnumber'=>false);

$this->standard_coursemodule_elements($features);

//-------------------------------------------------------------------------------

// buttons

$this->add_action_buttons();

}

function validation($data, $files) {

global $COURSE;

$errors = parent::validation($data, $files);

$mform =& $this->_form;

$maxmembers = $data['maxmembers'];

if ($maxmembers < 0) {

$errors['maxmembers'] = get_string('error');

}

return $errors;

}