Is there any way to update elements of the webpage with multiple threads in an action?

rubyonrails-talk
1

I'm trying to update some elements of the webpage with AJAX, RJS, etc by making threads in an action of a controller and trying to partial render the results inside each thread. The problem is that rails wont let me have more than 1 render or redirect per action.

Is there any possible way to do this?

Thanks!

2

This may be enough to get you started.

You can use render :update (though some people will shun you for doing so) and call replace_html multiple times. Something like

render :update do |page|   page.replace_html 'some_div', :partial => 'some_partial'   page.replace_html 'some_other_div', :partial => 'some_other_partial'   page << "some raw javascript if you want" end

There are many things you can do with render :update.

Peace, Phillip

3

I was actually doing that at the begining but id like to do that render partial in different momtents. Each thread does something and then they update a certain div in the page. This is more less the code

def parse_services

    lfmthread=Thread.new do           parse_service_1

        lfmthread.exit       end

      ytthread=Thread.new do

          parse_service_2         ytthread.exit       end end

def parse_service_1       ...generate data...    render :update do |page|         page.replace_html :service_1_results, :partial => 'tag', :object => @tag     end end

Is it possible to do something like this? Thanks again!

4

Perhaps rather than calling render from each individual thread, have each thread send their results to some intermediary object. That object would then call render only once when it had received all the data from each thread.

I hope this is relevant. I'm not 100% sure I'm on the same page as you.

5

I definitly think that we are on the same page. Its just that an intermediary object doesn't help since the method of the object is called from the action itself and we have the same problem. Thanks again.

6

This is what I mean:

class Renderer

  def initialize no_of_threads     @max = no_of_threads     @count = 0     @content_to_render =   end

  def addContent dom_id, content     @content_to_render << {:dom_id => dom_id, :content => content}     @count++     if @count == @max       output     end   end

  def output     render :update do |page|       @content_to_render.each do |content|         page.replace_html content[:dom_id], content[:content]       end     end   end

end

renderer = Renderer.new(2)

thread1=Thread.new do   renderer.addContent :some_dom_id, (render_to_string :partial => "name_of_partial") end

thread2=Thread.new do   renderer.addContent :another_dom_id, "some more generated content" end

render_to_string thing not tested - I saw it at http://snippets.dzone.com/posts/show/396