How To Submit A JavaScript Array Via XHR?

Hello,

I would like to create a button that, when clicked, pulls a subset of fields out a form on the same page and sends those fields' values as an array to the server as an XHR.

The server's response would then be used to update another element on the page.

So far I have got a button that pulls the subset of fields from the form and bundles their values into an array. But I don't know how to submit this via XHR to the server.

My code looks like this:

   <%= button_to_function 'Calculate price', 'bundle_order();' %>

where bundle_order() is a JavaScript function I wrote in application.js.

Can anyone help?

Thanks and regards,
Andy Stewart

I just worked out how to do this. Here it is lest anyone else is interested:

1. Make a JavaScript function that returns a hash of the elements you wish to submit (not an array as I originally did). For example:

   public/javascripts/application.js:

     function subset() {
       p1 = $F('dom-id-of-element-x')
       p2 = $F('dom-id-of-element-y')
       return $H({ x: p1, y: p2 });
     }

2. Use the link_to_remote helper and -- here's the part I was missing before -- pass the :with key:

   app/views/your_controller/your_action.rhtml:

     <%= link_to_remote 'Do something...',
                        :url => {:action => 'foo'},
                        :update => 'dom-id-to-update',
                        :with => 'subset()' %>

Hope that helps somebody.

Regards,
Andy Stewart