Rails - Dec 2007 - Message to user while page loads

In my RoR project, I have an action that loads a ton of information
than displays it to the user.  When the user ask that resource, he has
to wait a couple of seconds before something shows up.  I''d like to
give users a message while they are waiting.

I first thought that this would be easy, but I was wrong.  How can I
render a view before processing the action and then render another
view?

Any help would be greatly appreciated.

Thank you

Olivier Dupuis
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On Dec 28, 2007, at 10:18 AM,
olivierdupuis-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
>
> In my RoR project, I have an action that loads a ton of information
> than displays it to the user.  When the user ask that resource, he has
> to wait a couple of seconds before something shows up.  I''d like
to
> give users a message while they are waiting.
>
> I first thought that this would be easy, but I was wrong.  How can I
> render a view before processing the action and then render another
> view?
>
> Any help would be greatly appreciated.
>
In AQDWR v2 (Rails 1.2), there is this example:

<% form_remote_tag(:url => {:action =>
''iffy_function''},
:before => "Element.show(''spinner'');",
:success => "show_results(xhr);",
:failure => "show_error(xhr);",
:complete => "Element.hide(''spinner'');") do %>

Maybe this can get you started?

Peace,
Phillip


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I actually thought of using Ajax, since this seems to be the most
obvious choice.  The page would load, then I could send a xhr to the
server and update a div with my results.

The only problem is, I can''t find a way to call a xhr only once when
the page is loaded, without the intervention of the user.  When I look
at the prototype library, the periodically_call_remote method comes
closest to what I want.  But the only option I have is the frequency
at which the request should be made.  That means the request would be
made multiple time...

Any idea of an ajax call I could use to do this?

Thanks again

Olivier

On Dec 28, 11:35 am, Phillip Koebbe
<phillipkoe...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On Dec 28, 2007, at 10:18 AM,
olivierdup...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
>
>
>
> > In my RoR project, I have an action that loads a ton of information
> > than displays it to the user.  When the user ask that resource, he has
> > to wait a couple of seconds before something shows up.  I''d
like to
> > give users a message while they are waiting.
>
> > I first thought that this would be easy, but I was wrong.  How can I
> > render a view before processing the action and then render another
> > view?
>
> > Any help would be greatly appreciated.
>
> In AQDWR v2 (Rails 1.2), there is this example:
>
> <% form_remote_tag(:url => {:action =>
''iffy_function''},
> :before => "Element.show(''spinner'');",
> :success => "show_results(xhr);",
> :failure => "show_error(xhr);",
> :complete => "Element.hide(''spinner'');") do
%>
>
> Maybe this can get you started?
>
> Peace,
> Phillip
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On Dec 28, 2007, at 10:46 AM,
olivierdupuis-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
>
> I actually thought of using Ajax, since this seems to be the most
> obvious choice.  The page would load, then I could send a xhr to the
> server and update a div with my results.
>
> The only problem is, I can''t find a way to call a xhr only once
when
> the page is loaded, without the intervention of the user.  When I look
> at the prototype library, the periodically_call_remote method comes
> closest to what I want.  But the only option I have is the frequency
> at which the request should be made.  That means the request would be
> made multiple time...
>
> Any idea of an ajax call I could use to do this?
>
I generally do something like this by outputting some Javascript at  
the end of the page, like

<script type="text/javascript">
some_function_call();
</script>

Then in your js file, have some_function_call make your xhr request.   
The more appropriate way to do this is to use window.onload, but then  
you''ve got to figure out where to make the assignment

window.onload = some_function_call

That''s why I often just put it at the end of the page. There is  
probably a more proper Rails/Prototype way to do it, but I haven''t  
yet dug that deep.

Peace,
Phillip


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