Yii2 renderPartial clientSide validation doesn't work - yii2

Question

renderPartial clientSide validation doesn't work. I want to render part of form with ajax. Ex.:
_form.php
$form = ActiveForm::begin([
'options' => [
'enableAjaxValidation' => true,
]
]);
$form->field($model, 'category_id')->dropDownList($category, [
'onchange'=>'
$.get( "'.Url::toRoute('/controller/params').'", { id: $(this).val() } )
.done(function( data ) {
$( "#offers-param-content" ).html( data );
}
);'
]);
Controller.php
public function actionParams($id)
{
$model = new Param();
$params = EavAttribute::find()->where(['category_id'=>$id])->all();
$this->renderPartial('_params', ['model' => $model, 'params' => $params];
}
_params.php
foreach($params as $item){
echo Html::activeTextInput('text', $model, $item->name);
}

Answer 1

If you want to enable client validation, then set this property to true.
$form = ActiveForm::begin([
'options' => [
'enableAjaxValidation' => true,
'enableClientValidation'=>true
]
]);
And use renderAjax() function in place of renderPartial() it will inject into the rendering result with JS/CSS scripts and files which are registered with the view

Answer 2

In your Controller.php you need to set layout to false and die the execution
public function actionParams($id)
{
$this->layout = false;
$model = new Param();
$params = EavAttribute::find()->where(['category_id'=>$id])->all();
$this->renderPartial('_params', ['model' => $model, 'params' => $params];
die;
}

Answer 3

Your not returning any validation errors from your controller to your view.
To archive that use
yii\widgets\ActiveForm::validate($yourModel);
If your not using activeform you can return errors by
$model->getErrors();//will return errors from $model->validate()
From your excerpt try this
public function actionParams($id) {
$model = new Param();
if ($model->load(Yii::$app->request->post())) {
if (Yii::$app->request->isAjax) {
Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
return ActiveForm::validate($model); /* Validation error messages are returned by this static function */
}
$params = EavAttribute::find()->where(['category_id' => $id])->all();
$this->renderPartial('_params', ['model' => $model, 'params' => $params]);
}
}