Yii2:Kartik Depdrop Widget 更新时的默认值

Question

我正在使用Kartik Depdrop小部件。

一切都工作正常，除了我在创建新记录时没有选择值的情况下，在更新时，依赖字段应该显示Please select，而它在下拉列表中显示第一个值，并且在更新时保存，而我希望值"请选择"即即使在更新时也根据情况保存 null。

示例 - 我选择一个房间类别 - 依赖值是包，也可以为空。所以我没有在依赖字段包中选择任何值。但是当我来更新表单时，默认情况下显示下拉列表中的第一个值，而我希望please select值为默认值。

如何纠正这种情况？

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

注意：如果我在创建时在依赖下拉列表中选择一个值，则更新时的值会正确显示。

Answer 1

它对我来说效果很好。

查看文件

<?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(kartikdepdropDepDrop::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'], 
    ],
]); ?>

控制器文件

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 yiihelpersJson::encode(['output' => $out, 'selected' => $selected_id]);
    }
    return yiihelpersJson::encode(['output' => '', 'selected' => '']);
}

Answer 2

好的，

这是您要执行的解决方案：

// THE VIEW
use kartikwidgetsDepDrop;
// 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'=>'']);
}

确保在页面完全加载时执行此过程。