Yii2:Kartik Depdrop Widget default value on update?

Question

I am using the Kartik Depdrop widget.

Everything is working fine except in the situation where I have not selected a value on creation of new record, on update the dependent field should show Please select whereas it is showing the first value in the drop-down and it is getting saved on update, whereas I want the value of 'please select' i.e. null to be saved even on update depending on the situation.

Example- I select a room-category - dependant value is packages, which can be null as well. So I didn't select any value in the dependent field packages. But when I come to update the form the first value in the drop-down is showing by default, whereas I want the please select as the default.

How can correct this?

$form->field($model, 'package')->widget(DepDrop::classname(), [                            
   'data'=>ArrayHelper::map(\app\models\Package::find()->all(), 'id', 'package_name' ),
   'pluginOptions'=>[
   'depends'=>['room_category'], 
   'placeholder'=>'Select...',
   'url'=>  \yii\helpers\Url::to(['patient-detail/subcat']),               
    ]
    ])

Note:If I am selecting a value in the dependant dropdown on creation, then the value on update is showing correctly.

Answer 1

It works well for me.

View file

<?php echo $form->field($model, 'area_parent_id')->dropDownList(AreaCode::getProvinceOption(), ['prompt' => 'select...', 'id' => 'parent_id']); ?>

<?php echo Html::hiddenInput('selected_id', $model->isNewRecord ? '' : $model->area_id, ['id'=>'selected_id']); ?>

<?php echo $form->field($model, 'area_id')->widget(\kartik\depdrop\DepDrop::classname(), [
    'options' => ['id' => 'area_id', 'class' => '', 'style' => ''],
    'pluginOptions' => [
        'depends' => ['parent_id'],
        'placeholder' => 'select...',
        'initialize' => $model->isNewRecord ? false : true,
        'url' => Url::to(['/area-code/subcat']),
        'params'=> ['selected_id'], 
    ],

]); ?>

Controller file

public function actionSubcat()
{
    $out = [];
    if (isset($_POST['depdrop_all_params'])) {
        $parent_id = $_POST['depdrop_all_params']['parent_id'];
        $selected_id = $_POST['depdrop_all_params']['selected_id']; 
        $out = AreaCode::find()->select(['id', 'name'])->where(['parent_id' => $parent_id])->asArray()->all();
        return \yii\helpers\Json::encode(['output' => $out, 'selected' => $selected_id]);
    }

    return \yii\helpers\Json::encode(['output' => '', 'selected' => '']);
}

Answer 2

Okay this is the solution you want to do:

// THE VIEW
use kartik\widgets\DepDrop;

// Top most parent
echo $form->field($account, 'lev0')->widget(Select2::classname(), [
'data' => ArrayHelper::map(Account::find()->where('parent IS NULL')->asArray()->all(), 'id', 'name')
]);

//ADDITIONAL PARAM ID YOU MAY USE TO SELECT A DEFAULT VALUE OF YOUR MODEL IN YOUR DEPDROP WHEN YOU WANT TO UPDATE:
echo Html::hiddenInput('model_id1', $model->id, ['id'=>'model_id1' ]);

// Child level 1
echo $form->field($account, 'lev1')->widget(DepDrop::classname(), [
'data'=> [6 =>'Bank'],
'options' => ['placeholder' => 'Select ...'],
'type' => DepDrop::TYPE_SELECT2,
'select2Options'=>['pluginOptions'=>['allowClear'=>true]],
'pluginOptions'=>[
    'depends'=>['account-lev0'],
    'url' => Url::to(['/account/child-account']),
    'loadingText' => 'Loading child level 1 ...',
    'params'=>['model_id1'] ///SPECIFYING THE PARAM
]
]);

// CONTROLLER
public function actionChildAccount() {
$out = [];
if (isset($_POST['depdrop_parents'])) {
    $id = end($_POST['depdrop_parents']);
    $list = Account::find()->andWhere(['parent'=>$id])->asArray()->all();
    $selected  = null;
    if ($id != null && count($list) > 0) {
        //EXACTLY THIS IS THE PART YOU NEED TO IMPLEMENT:
        $selected = '';
        if (!empty($_POST['depdrop_params'])) {
            $params = $_POST['depdrop_params'];
            $id1 = $params[0]; // get the value of model_id1

            foreach ($list as $i => $account) {
                $out[] = ['id' => $account['id'], 'name' => $account['name']];
                if ($i == 0){
                    $aux = $account['id'];
                }

                ($account['id'] == $id1) ? $selected = $id1 : $selected = $aux;
            }
        }
        // Shows how you can preselect a value
        echo Json::encode(['output' => $out, 'selected'=>$selected]);
        return;
    }
}
echo Json::encode(['output' => '', 'selected'=>'']);
}

Ensure this process to be executed when the page is completely loaded.