在yii2的select2下拉列表中设置默认值

我在yii2中有一个依赖于kartik select2的下拉列表，我想选择一个值作为默认的选定值

<?=$form->field($EmployeeLeaveModel, 'EmployeeID')->widget(Select2::classname(), [
                        'data' => $Employee,
                        'language' => 'en',
                        'options' => ['placeholder' => 'Select Employee  ...'],
                        'pluginOptions' => [
                                'allowClear' => true
                             ],
                ]);
        ?>

如何获取在下拉列表中选择的默认值？

在控制器中

$EmployeeLeaveModel->EmployeeID = value;

或

鉴于

$EmployeeLeaveModel->EmployeeID = value;

<?= $form->field($EmployeeLeaveModel, 'EmployeeID')->widget(Select2::classname(), [
     'data' => $Employee,
     'language' => 'en',
     'options' => ['placeholder' => 'Select Employee,...'],   
]) ?>

---

$EmployeeLeaveModel->EmployeeID=value；

$EmployeeLeaveModel->EmployeeID=value我必须在何处添加此项？在选择2中使用模型之前。可能在控制器中是好的，或者直接在视图中添加到您的字段之前。谢谢我实现了它。