Use success
property. Here is the documentation http://x-editable.demopage.ru/index.php?r=site/widgets#Options
Try this
<?php
$this->widget('editable.EditableField', array(
'type' => 'select',
'params' => array('YII_CSRF_TOKEN' => Yii::app()->request->csrfToken),
'model' => $model,
'attribute' => 'category_id',
'url' => $this->createUrl('course/updateSameInfo'),
'source' => Editable::source(Coursecat::model()->findAll(), 'id', 'name'),
'placement' => 'right',
'success' => 'js: function(response, newValue) {
console.log(response); //Open the browser console to check the data
}'
));
?>