Update form after ajax save - yii2

Question

I want form data updated after ajax save. Cause if item was new (id - empty), it tries to create new one each time. Also there are back-end generated fields which are appears after save.
<?php $form = ActiveForm::begin([
'method' => 'post',
'action' => ['category/save', 'id' => $category ? $category->id : ''],
'enableClientValidation' => true,
// 'enableAjaxValidation' => false,
'validateOnChange' => false,
'validateOnBlur' => false,
'validateOnSubmit' => true,
'options' => [
'id' => 'customer-update',
'class' => 'ajax-submit',
],
'fieldConfig' => [
'template' => '<div class="row-content-col1">{label}</div><div class="row-content-col2">{input}{error}</div>'
]
]); ?>
.......
<?php echo $form->field($category, 'url')->textInput(['class' => 'ip', 'readonly' => true]); ?>
......
<?php $form->end(); ?>
Form field produce such html:
<div class="row-content-col1"><label class="control-label" for="category-url">Url</label></div><div class="row-content-col2"><input type="text" id="category-url" class="ip" name="Category[url]" readonly><div class="help-block"></div></div>
</div>
And than on controller i return this (tried different variations):
{"error":false,"message":"Category 'asdfzsdf sdf' saved","data":{"name":"asdfzsdf sdf","url":"asdfzsdf-sdf","project_id":1,"id":21}}
What is valid response for ajax form? Or is there other way to handle this all ?

Answer 1

Pjax is really useful for your challenge, Just add your form inside of Pjax widget. add form action to new path(such: site/control-data).
In your action method do what you want, but send response like that :
return $this->renderAjax('form path',$model);
It's the general of what you must do.
But maybe you have problem with jquery or pjax or need some more data, but all questions have an answer,
See Pjax for ActiveForm