如何在dropDownlist中顯示默認值

Question

我在索引中有兩個dropDownlist，當我選擇提交按鈕時，它將在控制器中得到動作，並且它執行一些操作並再次使用gridview渲染索引，但是所選dropDownList變爲空白，我怎麼能在dropDownllist中設置默認？

任何建議應appreciatable ...... 這是我的看法

<div class="col-sm-12" align="center"> 
       <?= $form->field($model, 'fk_int_payroll_month')->dropDownList(
        ArrayHelper::map(TblPayrollMonth::find()->all(), 'pk_int_payroll_month_id','vchr_month'), 
       ['prompt'=> 'Select...']) 
       ?> 
</div> 


<div class="col-sm-12" align="center"> 
      <?= $form->field($model, 'fk_int_payroll_year')->dropDownList(
       ArrayHelper::map(TblPayrollYear::find()->all(), 'pk_int_payroll_year_id','year'), 
       ['options' => [isset($_POST['fk_int_payroll_year'])?'fk_int_payroll_year':'' => ['Selected'=>true]]], 
      ['prompt'=> 'Seect...']) 
      ?> 
     </div> 

這是我的控制器

public function actionDisplay() 
    { 
     $model  = new TblPayroll(); 
     if(Yii::$app->request->post()!=null) 
     { 
      $data = Yii::$app->request->post(); 
      // var_dump($data); 
      // die; 
      $month = $data['TblPayroll']['fk_int_payroll_month']; 
      $year = $data['TblPayroll']['fk_int_payroll_year']; 

      /* Be careful with this! */ 
      $dataProviderSearch = new ActiveDataProvider 
      ([ 
       'query' => TblPayroll::find()->where(['fk_int_payroll_month'=>$month, 'fk_int_payroll_year'=> $year]), 
       'pagination' => ['pageSize' => 5], 
      ]); 


      if($dataProviderSearch) 
      { 
       return $this->render('index', [ 
       'dataProviderSearch' => $dataProviderSearch, 
       'model' => $model, 
       ]); 
      } 
     } 
      else{ 
       return $this->render('index', ['model' => $model]); 

}

當我選擇下拉會戈特actionDisplay，並找到數據提供者，然後它再次渲染到索引，以便該如何顯示默認的選擇值dropDownlist？

Answer 1

如果您正在使用一個ActiveRecord然後controllerAction你應該分配給$模型 - > your_fiedl你需要爲默認

 else{ 
      $model->fk_int_payroll_month = 3 
      return $this->render('index', ['model' => $model]); 

     } 

，如果你不使用的活動記錄的值，你可以使用

->dropDownList($yourlist ,$selection) 

如

->dropDownList(ArrayHelper::map(TblPayrollMonth::find()->all() ,3)