今天下午开始摸索使用grid扩展来展示表格，现在已经能展示出数据来了，但是点击导出的图标却显示不出来选项列表。
现在页面效果如下：
view部分的代码如下：
'pjax' => true,//加载loading动画
'bordered' => true,
'striped' => false,
'condensed' => false,
'responsive' => true,
'hover' => true,
'floatHeader' => true,
'floatHeaderOptions' => ['scrollingTop' => 50],
// 'showPageSummary' => true,
'panel' => [
'heading'=>'<h3 class="panel-title"><i class="glyphicon glyphicon-globe"></i> Countries</h3>',
'type'=>'success',
'before'=>Html::a('<i class="glyphicon glyphicon-plus"></i> Create Country', ['create'], ['class' => 'btn btn-success']),
'after'=>Html::a('<i class="glyphicon glyphicon-repeat"></i> Reset Grid', ['get-school-in-province'], ['class' => 'btn btn-info']),
'footer'=>false,
'export'=>true,
'toolbar'=>true,
],
'exportConfig' => [
GridView::PDF => [
'label' => '导出CSV',
'iconOptions' => ['class' => 'text-primary'],
'showHeader' => true,
'showPageSummary' => true,
'showFooter' => true,
'showCaption' => true,
'filename' => '用户表'.date("Y-m-d"),
'alertMsg' => '确定要导出CSV格式文件？',
'options' => [
'title'=>'',
],
'mime' => 'application/pdf',
'config' => [
'colDelimiter' => ",",
'rowDelimiter' => "\r\n",
],
],
// GridView::HTML => [],
// GridView::PDF => [],]
报错如下：
为什么点击右上角的导出下拉框，却没反应呢。
求答疑解惑！！！
