[Rails] On click, open new text box in Ruby on Rails

Hello,

I have a BlogPost resources, where in BlogPost 'show' screen, I want a
"new comment" button to be displayed and only on clicking that button I
want the new Comment view to be rendered into the same page. I would
like to use ajax concept to do this. How do I do this?

NOTE: I have BlogPost and Comment as seperate resources(plural)
Resources I've defined in my routes looks like this:

map.resources :blog_posts, :has_many => :comments

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