Weirdness with periodically_call_remote

Rails
1

Hi everyone,

I’m having a bit of a hard time with the function
periodically_call_remote. Here is my problem:

I have a periodically_call_remote in a partial. With ajax, I do a
replace_html of this partial for another partial, view/edit type of
thing. The 2nd partial doesn’t contain a periodically_call_remote.
The problem is that the browser CONTINUES to query the server even tho
the periodically_call_remote shouldn’t be there anymore, because the
partial changed.

Does anyone know how to disable this behavior? Can I call something in
my .rjs templates to disable/enablethe periodically_call_remote?

Thanks,

Jd

2

On Sep 6, 2006, at 9:26 AM, jackdan wrote:

the periodically_call_remote shouldn’t be there anymore, because the
partial changed.

Does anyone know how to disable this behavior? Can I call
something in
my .rjs templates to disable/enablethe periodically_call_remote?

Thanks,

Jd

Hey JD-

You can setup a little switch you can use to turn of a periodical

call like that. Just replacing the html does not stop the js from
executing. You have to use a condition variable for that. Like this:

In the view partial to start the periodical call:

<%= periodically_call_remote(:url => {:action => 'update_results'}, :frequency => 5, :condition => "stop_polling == false") %>

And in the controller to handle the update and turn off the periodic
call:

def update_results
render :update do |page|
page[‘periodic’].replace_html :partial => ‘results_table’
page.assign ‘stop_polling’, true #<< here is the magick!
end
end

Cheers-
-Ezra

3

Ahhh, exactly what I was looking for… Thank you very much

But Unfortunately I have another question :slight_smile:

I do a periodically_call_remote with a timestamp, to see if the item
was modified ever since the last readout from the database.

What would be the best way to update the timestamp that
periodically_call_remove is called with when I update an item?

<%= periodically_call_remote :url => { :action =>
:check_for_modifications, :id => @item, :readout_from_db =>
Time.now.to_i},
:frequency => VERIFICATION_DELAY,
:condition => “stop_polling == false” %>

It is even possible ordo I have to refresh the entire page?

Thanks,

Jd

4

I hate replying to myself, but I just noticed somethign else. When I
come back from my partial that does not have a periodically_call_remote
to the one that has, the browser now queries the server TWICE. Once
for the original periodically_call_remote, and once for everytime the
partial is reloaded.

This is not good…