This is adaptation jquery.fix.clone.js for Yii2.

The preferred way to install this extension is through composer.

Run

php composer.phar require kosv/yii2-jquery-fix-clone "~1.0"

Or, you may add

"kosv/yii2-jquery-fix-clone": "~1.0"

to the require section of your composer.json file and execute php composer.phar update.