You could have a problem described below
This has been copied from https://disqus.com/home/discussion/krajee/not_found_404_kartik_439/
I am having a problem with the editable column in a gridview, I was hopingfor a point in the right direction to resolve. When I add a row in a blank grid via ajax, I reload the grid using pjax. On the Pjax reload the editable column comes up as a button and has no events triggered. Firebug reports the following error.
TypeError: jQuery(…).editable is not a function.
On a page reload after adding the first row everything works as expected. Adding a second line to the grid everything works as expected. The problem only occurs when the first row is added and the grid refreshed via pjax.
This can be fixed by loading the assets manually .
Just put this on the top of your view and it will work fine.
I have also reported it kartik here where more info can be found regards this issue.
Have a happy Yii2 programming!