Flowdock
replace_html(id, *options_for_render) public

Replaces the inner HTML of the DOM element with the given id.

options_for_render may be either a string of HTML to insert, or a hash of options to be passed to ActionView::Base#render. For example: 

  # Replace the HTML of the DOM element having ID 'person-45' with the
  # 'person' partial for the appropriate object.
  # Generates:  Element.update("person-45", "-- Contents of 'person' partial --");
  page.replace_html 'person-45', :partial => 'person', :object => @person
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July 5, 2009
2 thanks

To verify if the element exists before replacing.

Just add this code into a initializer file.

Atention: The code starts at the “module ActionView” and the last “end” has to be copied too.

module ActionView

module Helpers
  module PrototypeHelper
    class JavaScriptGenerator #:nodoc:
      module GeneratorMethods
        def replace_html_if_exists(id, *options_for_render)
          call "if($('#{id}')) Element.update", id, render(*options_for_render)
        end
      end
    end
  end
end

end