sarga/packages/Webkul/Admin/src/Http/Controllers/ExportController.php

<?php

namespace Webkul\Admin\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Webkul\Admin\Http\Controllers\Controller;
use Webkul\Admin\Exports\DataGridExport;
use Excel;

/**
 * Export controlller
 *
 * @author    Rahul Shukla <rahulshukla.symfony517@webkul.com>
 * @copyright 2018 Webkul Software Pvt Ltd (http://www.webkul.com)
 */
class ExportController extends Controller
{
    protected $exportableGrids = [
        'OrderDataGrid', 'OrderInvoicesDataGrid', 'OrderShipmentsDataGrid', 'CustomerDataGrid', 'TaxRateDataGrid'
    ];

    /**
     * Create a new controller instance.
     *
     */
    public function __construct()
    {
        $this->middleware('admin');
    }

    /**
     * function for export datagrid
     *
     * @return \Illuminate\Http\Response
    */
    public function export()
    {
        $criteria = request()->all();
        $format = $criteria['format'];

        $gridName = explode('\\', $criteria['gridName']);
        $path = '\Webkul\Admin\DataGrids'.'\\'.last($gridName);

        $proceed = false;

        foreach($this->exportableGrids as $exportableGrid) {
            if(last($gridName) == $exportableGrid) {
                $proceed = true;
            }
        }

        if(! $proceed) {
            return redirect()->back();
        }
        $gridInstance = new $path;

        $records = $gridInstance->export();

        if (count($records) == 0) {
            session()->flash('warning', trans('admin::app.export.no-records'));

            return redirect()->back();
        }

        if ($format == 'csv') {
            return Excel::download(new DataGridExport($records), last($gridName).'.csv');
        } else {
            if ($format == 'xls') {
                return Excel::download(new DataGridExport($records), last($gridName).'.xlsx');
            } else {
                session()->flash('warning', trans('admin::app.export.illegal-format'));

                return redirect()->back();
            }
        }


    }
}