Rails - Oct 2007 - passing a javascript variable to ruby in a view - possible?

Hello,

I have a simple application that allows you to create an account, sign
in, and play a game using an embedded web player on an .rhtml page.
The web player (Unity) is able to call javascript functions on
the .rhtml page. The .rhtml page uses a partial to render a high score
list.

I want to be able to refresh the current high score list based on the
level you are on in the game. The game calls the following JS when a
level is cleared:

<script language="javascript1.1"
type="text/javascript">
function loadHighScores(level)
{
	//this won''t work because the button is invisible in JS and because
level is not accessible to Ruby
        //
           <% form_remote_tag :url =>  { :action
=> :update_scores, :id => level } do %>
            <%= submit_tag "Refresh Scores for This Level" %>
	    <% end %>
}
</script>

So is there a way to:
a) pass the JS level variable to Ruby
b) perform the remote call without the user having to press a button;
in other words, only when the JS function loadHighScores is called by
the external game player (I would like to avoid the function
periodically_call_remote if possible)

My apologies if this post belongs in one of the spin-off groups
(AJAX).

Thanks,
n


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Just create an ajax request and allow a parameter to be passed in


<script type="text/javascript">
//<![CDATA[
function update_my_method(a_value) {
  new Ajax.Request(''/my_controller/my_method/''+a_value,
          {asynchronous:true, evalScripts:true})

}
//]]>
</script>

i don''t think that there is currently a helper to do  this.  This
quick and dirty helper (based on javascript_tag and code from
remote_function) will create a simple id value.

def pass_to_remote(options, function_name)
  javascript_options = options_for_ajax(options)
  function = "function #{function_name}(value){"
  function<< "new Ajax.Request("
     url_options = options[:url]
     url_options = url_options.merge(:escape => false) if
url_options.is_a?(Hash)
     function <<
"''#{url_for(url_options)}/''+value)"
     function << ", #{javascript_options}"
     function<< "}"
    return javascript_tag(function)
end

To use in the view something like.
<%=
pass_to_remote({:url=>{:action=>''change_something''}},
''remote_change'') %>
will create a javascript function called ''remote_change'', 
only url
option is included, and this should only contain action and
controller.

To test: (obviously you would have javascript code that can call
remote_change directly).
<a href=''#''
onclick=''remote_change(8)''>hello</a>


This works.  I have also tried extending the helper to allow a name
for the value to be included so that it appears with that name in the
params.  But this is a bit more tricky and I havn''t quite got it right
yet, separating the named value and the id value is not quite
straightforward.

hth
Tonypm


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On 6 Oct 2007, at 10:47, tonypm wrote:
>
> i don''t think that there is currently a helper to do  this.  This
> quick and dirty helper (based on javascript_tag and code from
> remote_function) will create a simple id value.
>
You can do this with :with

<script >
jsparams={person_name: ''bob'' quantity: 2};
</script>
<%= link_to_remote ''foo'', :url => {:action =>
''index''}, :with =>
''jsparams''%>

Clicking on the link results in

Processing FooController#index (for 127.0.0.1 at 2007-10-06 18:55:44)  
[POST]
   Session ID: cd593ad4bfc50ff48ce34d7fa4e0d7d1
   Parameters: {"person_name"=>"bob",
"quantity"=>"2",
"action"=>"index",
"controller"=>"foo"}

:with can be pretty much any javascript expression.

Fred

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