2 Layouts in Polymer (ie: Main-App, Signup) - polymer

Question

In the PSK, the index.html references a my-app.html template. In there I have my main layout with app-drawer, header ect..
How do I then have a page without that template which just has for example a centered card with login fields.
Do I somehow use my-app.html to just contain nested layouts for each?
index.html
-my-app.html
--main-shell.html (main content with iron-pages)
--blank.html (for signup/login)
Thanks.

Answer 1

I recommend to those that ask, that below the my-app element you create a my-session element which handles authentication and a my-pages element to manage the application itself. Within my-session I unhide a login element if that is needed (I allow users with an authenticated cookie to access the application without logging in).
My my-app's outline is like this
<app-header-layout>
<app-header
fixed
effects="waterfall">
<app-toolbar>
...
</app-toolbar>
</app-header>
<my-session id="session" user="{{user}}"></my-session>
<my-pages
id="pages"
user="[[user]]"
unresolved
hidden="[[!isLoggedOn]]" >APPLICATION LOADING</my-pages>
</app-header-layout>
my-session then has a my-login element which will contain the login form centered on a paper-card in the middle of the page
This is done with
<dom-module id="my-session">
<template>
<style>
[hidden] {
display: none!important;
}
</style>
<iron-ajax
id="validateuser"
url="/api/validate_user"
handle-as="json"
method="POST"
body="{}"
content-type="application/json"
on-response="_validated"></iron-ajax>
<iron-ajax
id="logoff"
url="/logoff"
body="{}"
handle-as="json"
method = "POST"
content-type="application/json"></iron-ajax>
<my-waiting waiting="[[waiting]]"></my-waiting>
<my-logon user="{{user}}" hidden="[[!needsLogon]]"></my-logon>
</template>
<script>...</script>
</dom-module>
The iron-ajax requests are to validate a users cookie (I still ask the server to validate it, since it contains an encrypted token) and to log of the user. This is all handled in javascript which I don't show (for simplicities sake).