Update specific div using post request.

It is possible to update specific div in my rhtml file using post
request like ajax do?

It is possible to update a specific div using a post request like AJAX do.
you need to use link_to_remote method for this.

What does this link_to_remote method does…

Returns a link to a remote action defined by options[:url] (using
the url_for format) that’s called in the background using
XMLHttpRequest. The result of that request can then be inserted into a DOM
object whose id can be specified with options[:update]. Usually,
the result would be a partial prepared by the controller with render
:partial.
(from apis)
eg.

link_to_remote (“Delete”, :update=>“posts”, :url=> {:action =>“destroy”, :id=>post.id})

the above function call will generate a link called Delete which when called will delete the item specified by the id and simultaneously update the div having the id “posts” without reloading the page.

link_to_remote requests are posts so don’t need to worry about it.