public function __construct($controller, $name, $fields = null, $actions = null, $validator = null)
    {
        if (!$fields) {
            $helpHtml = _t('GroupImportForm.Help1', '<p>Import one or more groups in <em>CSV</em> format (comma-separated values).' . ' <small><a href="#" class="toggle-advanced">Show advanced usage</a></small></p>');
            $helpHtml .= _t('GroupImportForm.Help2', '<div class="advanced">
	<h4>Advanced usage</h4>
	<ul>
	<li>Allowed columns: <em>%s</em></li>
	<li>Existing groups are matched by their unique <em>Code</em> value, and updated with any new values from the 
	imported file</li>
	<li>Group hierarchies can be created by using a <em>ParentCode</em> column.</li>
	<li>Permission codes can be assigned by the <em>PermissionCode</em> column. Existing permission codes are not
	cleared.</li>
	</ul>
</div>');
            $importer = new GroupCsvBulkLoader();
            $importSpec = $importer->getImportSpec();
            $helpHtml = sprintf($helpHtml, implode(', ', array_keys($importSpec['fields'])));
            $fields = new FieldList(new LiteralField('Help', $helpHtml), $fileField = new FileField('CsvFile', _t('SecurityAdmin_MemberImportForm.FileFieldLabel', 'CSV File <small>(Allowed extensions: *.csv)</small>')));
            $fileField->getValidator()->setAllowedExtensions(array('csv'));
        }
        if (!$actions) {
            $action = new FormAction('doImport', _t('SecurityAdmin_MemberImportForm.BtnImport', 'Import from CSV'));
            $action->addExtraClass('ss-ui-button');
            $actions = new FieldList($action);
        }
        if (!$validator) {
            $validator = new RequiredFields('CsvFile');
        }
        parent::__construct($controller, $name, $fields, $actions, $validator);
        $this->addExtraClass('cms');
        $this->addExtraClass('import-form');
    }
 public function __construct($controller, $name, $fields = null, $actions = null, $validator = null)
 {
     if (!$fields) {
         $helpHtml = _t('ExcelGroupImportForm.Help1', '<p><a href="{link}">Download sample file</a></p>', array('link' => $controller->Link('downloadsample/Group')));
         $helpHtml .= _t('ExcelGroupImportForm.Help2', '<ul>' . '<li>Existing groups are matched by their unique <em>Code</em> value, and updated with any new values from the ' . 'imported file</li>' . '<li>Group hierarchies can be created by using a <em>ParentCode</em> column.</li>' . '<li>Permission codes can be assigned by the <em>PermissionCode</em> column. Existing permission codes are not ' . 'cleared.</li>' . '</ul>');
         $importer = new GroupCsvBulkLoader();
         $importSpec = $importer->getImportSpec();
         $helpHtml = sprintf($helpHtml, implode(', ', array_keys($importSpec['fields'])));
         $extensions = array('csv', 'xls', 'xlsx', 'ods', 'txt');
         $fields = new FieldList(new LiteralField('Help', $helpHtml), $fileField = new FileField('File', _t('ExcelGroupImportForm.FileFieldLabel', 'File <small><br/>(allowed extensions: {extensions})</small>', array('extensions' => implode(', ', $extensions)))));
         $fileField->getValidator()->setAllowedExtensions(array('csv'));
     }
     if (!$actions) {
         $action = new FormAction('doImport', _t('ExcelGroupImportForm.BtnImport', 'Import from file'));
         $action->addExtraClass('ss-ui-button');
         $actions = new FieldList($action);
     }
     if (!$validator) {
         $validator = new RequiredFields('File');
     }
     parent::__construct($controller, $name, $fields, $actions, $validator);
     $this->addExtraClass('cms');
     $this->addExtraClass('import-form');
 }