我在yii2中的可搜索下拉列表不起作用

use yii\web\View;

$this->registerJsFile('@web/path/to/select2.min.js', ['depends' => [View::class]]);
$this->registerCssFile('@web/path/to/select2.min.css', ['depends' => [View::class]]);

public function rules()
{
    return [
        // 其他规则...
        [['category_id'], 'integer'],
    ];
}

use yii\helpers\ArrayHelper;
use yii\widgets\ActiveForm;
use kartik\select2\Select2;

$form = ActiveForm::begin();

echo $form->field($model, 'category_id')->widget(Select2::class, [
    'data' => ArrayHelper::map($categories, 'id', 'name'),
    'options' => ['placeholder' => '请选择分类'],
    'pluginOptions' => [
        'allowClear' => true,
    ],
]);

ActiveForm::end();

public function actionYourAction()
{
    $model = new YourModel();

    if ($model->load(Yii::$app->request->post()) && $model->validate()) {
        // 处理提交的表单数据

        return $this->redirect(['success']);
    }

    return $this->render('your-view', [
        'model' => $model,
    ]);
}