IOWA binding magic (long)

[Mark Probert]

Hi, Kirk and everyone.

This one is a little tough to explain so please bear with me.

Like DemoApp, I have a header and leftnav, with Header importing LeftNav.
Header.iwa looks like:

import 'LeftNav'
class Header < Iowa::Component
attr_binding :user, :ulevel
# stuff gone
end

<?
leftnav {
user = user
ulevel = ulevel
}
?>


LeftNav.iwa like:

class LeftNav < Iowa::Component
attr_binding :user, :ulevel

def foo_page
newPage = page_named("Run::Foo")
newPage.user = @user
newPage.ulevel = @ulevel
yield newPage
end
end

<?
header {
user = user
ulevel = ulevel
}
?>

LeftNav.html looks like:

<div id="pagebody">
<div id="menu">
<ul>
<li><a href="@index_page">Login</a></li>
<li><a oid="foo_page">Foo</a></li>
</ul>
user='@user'
level='@ulevel'
</div>
</div>

The main page (Index.html) has a login form from which I extract user and
ulevel (user access level).

So, when I login I go to page Bar which is generated from the Login
button on the main form (Index.iwa) like:

def goLogin
check_login_details # form validation .. errors into @errlist
if @errlist.empty?
# Now go into the application itself
newPage = page_named('Run::Main')
@ulevel = $hcSecurity.userGroup(@username)
newPage.user = CGI::escapeHTML(@username)
newPage.ulevel = @ulevel
yield newPage
end
end

Which works fine. Run::Main has the correct username and ulevel. [As an
aside, I noted that CGI::escapeHTML(@username) wiped @username. Is this
expected behanviour?]

However, if I click on the LeftNav foo link, the username and ulevel are
both blank (empty strings). Obviously, I am not getting the bindings
right somewhere.

Main.iwa is very simple and looks like:

import 'Header'
import 'Footer'

class Main < Iowa::Component

attr_accessor :header, :user, :ulevel

def run_single
new_page = page_named("Run::SingleCmd")
yield new_page
end
end

<?
header {
user = user
ulevel = ulevel
}
?>

This make any sense?

Also, I notice that there is an 'attr_binding' attribute. Can you
explain that one to me?

Regards,