Conditional validation if input field is empty or not? - yii2

Question

I have form which contain address, country, district field. If address is not empty then country and district is required. If address is empty then country, district not required.
I define in table model rules method like this using conditional validation as document says
public function rules()
{
return [
[['username', 'password', 'email', 'tanggal_daftar','password_validate'], 'required'],
[['customer_id','propinsi_id', 'kota_id', 'kecamatan_id', 'user_status_id','poin'], 'integer'],
[['tanggal_daftar','mobile_token','fb_id','newsletter','agree','password_validate','old_password'], 'safe'],
[['username', 'jenis_kelamin'], 'string', 'max' => 10],
[['password'], 'string', 'max' => 70],
[['identitas'], 'required', 'on' => 'login'],
[['email','username'], 'unique','except' => 'login'],
[['email'],'email'],
[['nama', 'hobby', 'pekerjaan'], 'string', 'max' => 30],
//address field
[['alamat'], 'string', 'max' => 200],
//country field
[['negara_id'], 'string', 'max' => 3],
[['kode_pos'], 'string', 'max' => 6],
[['hp'], 'string', 'max' => 18],
[['is_agent'],'boolean'],
[['profile_picture'],'string','max' => 100],
[['password_validate'], 'compare', 'compareAttribute'=>'password', 'message'=>Yii::t('app', 'Password tidak sama')],
[['agree'],'compare','operator' => '==','compareValue' => true,'message' => ''],
//country field
[['country_id'], 'required', 'when' => function($model){
return $model->address != null;
..
what about the code if address is empty then country not required??
}],
My view
...
...
.. address field ..
<?= $form->field($model, 'alamat')->textInput(['maxlength' => true,'class'=>'input_text'])->label('Address')?>
... country field drop down ..
<?= $form->field($model, 'negara_id')->dropDownList(ArrayHelper::map(TbNegara::find()->all(), 'negara_id', 'negara_name'),['prompt'=>'-- Pilih Negara --','id'=>'negara_id','class'=>'input_select'])->label('Country') ?>
...
...
If I test above code, whether address empty or not in my form then country field always required.
Am I doing wrong?
UPDATED
country is required when address is not null is working now.
so if I type in address field and press submit button it show required error, then if I type nothing in adress field and press submit button, it will process the submit.
Solution is
without 'enableAjaxValidation' => true, at begin form
and here is my table model rules for country field
[['negara_id'], 'required', 'when' => function($model){
return $model->alamat != null;
}, 'whenClient' => "function (attribute, value){
return $('#tbcustomer-alamat').val() != '';
}"],
now I have other similar problem when I implement this code
[['propinsi_id'], 'required', 'when' => function($model){
//district required if country is set
return $model->negara_id != null;
}, 'whenClient' => "function (attribute, value){
return $('#negara_id').val() != '';
}"],
district is not required even country is set, it should required if country set.
so If I type in address and set country, and leave district blank and I press submit, it will process submit but resulting in district cann't be blank [ 'propinsi_id' => [ 0 => 'ID Propinsi cannot be blank.' ] ]
something like my validation work on server side but not in client side.
district loaded via ajax when country is set
here is view for district field
<div class="form_grup leftside fl">
<div class="input_select">
<?php
if (isset($model->propinsi)){
echo $form->field($model, 'propinsi_id')->widget(DepDrop::classname(), [
'options'=>['id'=>'propinsi_id','class'=>'input_select'],
'data'=>[$model->propinsi_id=>$model->propinsi->propinsi_name],
'pluginOptions'=>[
'initialize' => true,
//depends on country
'depends'=>['negara_id'],
'class'=>'input_select',
'placeholder'=>'-- Pilih Propinsi --',
'url'=>Url::to(['customer2/propinsi'])
]
]);
} else {
echo $form->field($model, 'propinsi_id')->widget(DepDrop::classname(), [
'options'=>['id'=>'propinsi_id','class'=>'input_select'],
'pluginOptions'=>[
'initialize' => true,
//depends on country
'depends'=>['negara_id'],
'class'=>'input_select',
'placeholder'=>'-- Pilih Propinsi --',
'url'=>Url::to(['customer2/propinsi'])
]
]);
}
?>
<!-- <i class="fa fa-angle-down"></i> -->
</div>
</div>
what am I doing wrong for district field client side validation?

Answer 1

_form.php
<?php $form = ActiveForm::begin(['enableAjaxValidation' => true]); ?>
controller
if ($model->load(Yii::$app->request->post()) && Yii::$app->request->isAjax) {
\Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
return \yii\widgets\ActiveForm::validate($model);
}
model
[['country_id'], 'required', 'when' => function ($model) { return $model->address != null;}, 'enableClientValidation' => false ],
[['propinsi_id'], 'required', 'when' => function ($model) { return $model->country_id != null;}, 'enableClientValidation' => false ],