I was struck by the fact that there doesn't seem to be a way to use RJS to install a callback. For example:
page.visual_effect :slideup, @dom_id, :afterFinish => XXXXX
I want the XXXXX to be more RJS code. I don't want to have to revert back to Javascript! But that seems the only solution. What if I have a bunch of DOM manipulation I have do after I have slide the area up? What I want is something like:
page.visual_effect :slideup, @dom_id, :afterFinish => page.function {|p| p.replace_html 'foo', 'Bar' p.show 'baz' }
So I took a stab at implementing Javascript functions via RJS. The below implementation allows you to define a anonymous function which is returned as a string. Or you can give the function a name (and possible some argument names) and you get to define a named function (although I haven't really tested this as I really only need anonymous functions for callbacks). I welcome feedback and hope this is useful to someone else.
module ActionView module Helpers module PrototypeHelper class JavaScriptGenerator module GeneratorMethods # Will create a function using the block as the defination for the # function. If the function is given a name then it will be recorded # to the page under the name given. If a name is not given then # an anonymous function is instead created as a string and returned. # nothing is recorded to the page. This allows your function to be # used as a callback such as in :after_finish on a visual_effect. def function(name=nil, *arg_names, &blk)
# Run block to collect lines sub_gen = JavaScriptGenerator.new @context, &blk body = sub_gen.instance_variable_get("@lines") * ";#{$/}\t"
# For line from block execution line = "function #{name}(#{arg_names.collect(&:to_s).join ', ' }) {#{$/}\t#{body}#{$/}}"
name ? record(line) : line end end
