class.ilDclExportGUI.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */

require_once('./Services/Export/classes/class.ilExportGUI.php');
require_once('./Modules/DataCollection/classes/class.ilDclExportTableGUI.php');

class ilDclExportGUI extends ilExportGUI
{
        protected function buildExportTableGUI()
        {

                $table = new ilDclExportTableGUI($this, 'listExportFiles', $this->obj);
                return $table;
        }


        function createExportFile() {
                if ($_POST['format'] == 'xlsx') {
                        $this->checkForExportableFields();
                }

                return parent::createExportFile();
        }


        protected function checkForExportableFields() {
                global $ilCtrl, $lng;
                foreach ($this->obj->getTables() as $tbl) {
                        foreach ($tbl->getFields() as $field) {
                                if ($field->getExportable()) {
                                        return true;
                                }
                        }
                }

                ilUtil::sendFailure($lng->txt('dcl_no_export_data_available'),true);
                $ilCtrl->redirect($this, "listExportFiles");
        }

}