Where to put my JS stuff?

Hello,
I’d link to know your opinion about where should I put some JS logic, In
a
form i put it all in the submit button, and in another I put it in the
controller. See:

First way:

Form:
<%= submit_to_remote ‘Save’, ‘Save’,
:url => {:action => ‘update’, :id => @folder},
:update => ‘main_tab_content’,
:before => ‘loading()’ ,
:complete => “unloading();tree.refreshFolder(’#{@folder.parent.id}’)” %>

Controller:
def update
@folder = Folder.find(params[:id])
if @folder.update_attributes(params[:folder])
flash[:notice] = ‘Folder was successfully updated.’
redirect_to :action => ‘_edit’, :id => @folder
else
render :action => ‘edit’
end
end

Second way:
*
*
Form:
<%= submit_to_remote ‘Create’, ‘Create’,
:url => {:action => ‘create’},
:before => ‘loading()’,
:complete => ‘unloading();’ %>

Controller:
def create
parent = Folder.find_by_id(params[:target_id])
@folder = parent.children.create(params[:folder])
if parent && @folder.save
flash[:notice] = ‘Folder was successfully created.’
render :update do |page|
page.replace_html ‘main_tab_content’, :partial => ‘edit’
page.call ‘tree.refreshFolder’, @folder.parent.id.to_s
end
else
render :action => ‘new’
end
end

First way let the controller cleaner and the submit call more complex.
Second way is the opposite.
What’s the preferred way? What would make the application easier to
maintain
at the end?

Thanks

Mathieu