What is the purpose of beginBody() , endBody() and other similar functions called in the layout?
What is the purpose of beginBody() , endBody() and other similar functions called in the layout?
"Placeholders" to inject code:
http://www.yiiframework.com/doc-2.0/guide-structure-views.html
Look and read at “Creating Layouts”. 
That’s what the documentation says. 
I guess my question was a bit vague. (Sorry for that).
What I want to know is how to use them?
say I want to insert some code at the beginning of the body only in a particular action. Do I have to override the beginBody() function? How?
Hi!
I think you have to trigger the events somehow.
Read about Events in Documentation.
Maybe that helps…
Sorry but I cant help much more or with a concrede example.
I’m not familar with YIIs events and handlers yet.
Just call them at the appropriate place.
No. Use beginBlock() / endBlock() for HTML or registerJs() for Javascript.The view component will takes care for the rest.