\
**Category:** Rails\
**Created:** [June 1, 2007, 2:22pm UTC](https://www.ruby-forum.com/t/page-replace-html-problem/105694 "2007-06-01T14:22:56Z")\
**Posts on this page:** 4\
**Page:** 1
**Author:**  [@emiliano](https://www.ruby-forum.com/u/emiliano)\
**Post date:** [June 1, 2007, 2:22pm UTC](https://www.ruby-forum.com/t/page-replace-html-problem/105694/1 "2007-06-01T14:22:56Z")
Hi all,
I tried to use ajax in a simple eshop application, but the
page.replace\_html fail in strange mode.
Controller code:
class mycontroller \< ApplicationController
# Some code
def login
# Check user existence in db
```
# if the user exist replace the login form with the user menu'
```
class mycontroller \< ApplicationController
# Some code
def login
# Check user existence in db
```
# if the user exist replace the login form with the user menu'
if session[:user] != nil
create_user_menu
end
```
end
def create\_user\_menu
@user = session[:user]
```
render :update do |page|
page.replace_html "login", :partial => 'user_menu', :locals
```
=\> { :user =\> @user }
page.visual\_effect :highlight, “login”
end
end
end
Layout code:
\<%= render :partial =\> 'login' %\>
The partial \_login.rhtml code:
\<%= start\_form\_tag({:action =\> ‘login’}, {:name =\> ‘form\_login’}) %\>
\<%= render :partial =\> ‘login\_form’ %\>
\<%= link\_to\_function(“Login”, “document.form\_login.submit()”)
%\>
\<%= end\_form\_tag %\>
The partial \_user\_menu.rhtml contain only a simple html table.
When i click on “Login” link, the browser show a new page with
my\_controller/login action and the code generted by the js helper,
instead the correct user menu in the page my\_controller.
Where is the error?
Thanks in advance, Emiliano.
---
**Author:**  [@emiliano](https://www.ruby-forum.com/u/emiliano)\
**Post date:** [June 1, 2007, 2:52pm UTC](https://www.ruby-forum.com/t/page-replace-html-problem/105694/2 "2007-06-01T14:52:00Z")
do you have this line somewhere in your layout header ?
\<%= javascript\_include\_tag :defaults %\>
fo the ajax stuff you need prototype and its friends
---
**Author:**  [@emiliano](https://www.ruby-forum.com/u/emiliano)\
**Post date:** [June 1, 2007, 3:00pm UTC](https://www.ruby-forum.com/t/page-replace-html-problem/105694/3 "2007-06-01T15:00:00Z")
You use a normal form to send the login form’s content. this launched
a full request cycle and results in a complete page being loaded.
so the browser expects your server to return a complete page, while
your server only returns a bit of javascript and the partial, which
should of course only be done when the request was an AJAX request.
You have to use remote\_form\_for or form\_remote\_tag to send the form
data via AJAX.See the API for Documentation.
[http://api.rubyonrails.org/classes/ActionView/Helpers/PrototypeHelper.html#M000529](http://api.rubyonrails.org/classes/ActionView/Helpers/PrototypeHelper.html#M000529)
[http://api.rubyonrails.org/classes/ActionView/Helpers/PrototypeHelper.html#M000530](http://api.rubyonrails.org/classes/ActionView/Helpers/PrototypeHelper.html#M000530)
---
**Author:**  [@emiliano](https://www.ruby-forum.com/u/emiliano)\
**Post date:** [June 1, 2007, 5:50pm UTC](https://www.ruby-forum.com/t/page-replace-html-problem/105694/4 "2007-06-01T17:50:33Z")
ha scritto:
>
Yes! This is the solution.
Many thanks.