Add export Excel with post as a method.

[jiwom]

Use exportPostExcel as button. This button is recommended for IE browsers since IE has URL length limit.

[jiwom]

change exportPostExcel to postExcel

sample code would be

public function html()
    {
        return $this->builder()
                    ->columns($this->getColumns())
                    ->parameters([
                        'buttons'      => ['postExcel'],
                    ]);
    }

Take note of adding CSRF token

<meta name="csrf-token" content="{{ csrf_token() }}" />
<script type="text/javascript">
$.ajaxSetup({
    headers: {
        'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
    }
});
</script>

Take note of your Routing

$router->post('sample/export', SampleController::class . '@index');

[yajra]

Please solve conflict / remove the same script found on #41 as it was already merged. Thanks!

[yajra]

Please also submit a PR on docs if possible. Thanks!