class.ilDclExportGUI.php

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

class ilDclExportGUI extends ilExportGUI
{

    protected function buildExportTableGUI()
    {
        $table = new ilDclExportTableGUI($this, 'listExportFiles', $this->obj);

        return $table;
    }


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

        return parent::createExportFile();
    }


    protected function checkForExportableFields()
    {
        global $DIC;
        $ilCtrl = $DIC['ilCtrl'];
        $lng = $DIC['lng'];
        foreach ($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");
    }
}