A template with a tabbed layout
JavaScript CSS
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TabView Template

This template provides a basic tabbed view layout, using some web components from Brick.

This is part of the mortar template collection for building Open Web Apps.


There are a few ways to get this template:

If you use Git:

git clone https://github.com/mozilla/mortar-tab-view.git

Or download the latest version in this ZIP file.


Start a local server to simulate accessing the hosted app from the browser, and trying the Install button flow.

For example:

python -m SimpleHTTPServer 8000

then access localhost:8000 or your.computer.ip:8000 (for example, using Firefox (Desktop or Mobile), or the Browser app in a Firefox OS simulator (or device).

You'll need to use the IP address when using a physical device. Change the port accordingly, if you're running a webserver in this port already.

Code walkthrough

The manifest.webapp file contains metadata about the app, such as its name, description, icon and required permissions for running under Firefox OS.

There really isn't much logic or behaviour baked into this template--it's more about demonstrating how to build an app using web components, and how to provide Install functionality, since this is a hosted web app.

The app layout consists of a top level x-layout element which contains an x-appbar, an x-deck and a x-tabbar. To see this code in place, have a look at index.html and the comments.

The app logic is defined in js/app.js. Here we first wait for the DOMComponentsLoaded event to fire. This is so that we ensure that the web components are ready before using them.

Then we get a handle to the deck and the tabbar so we can call methods on them. We select the first tab and show the first card in the deck.

After that, we set up the installation functionality, which is associated to the install button. We're using a small library for dealing with installs; this library is in js/lib/AppInstall.js and is referenced in index.html, right before js/app.js, so that the code is available when we want to use it.

Getting help

If you find something that doesn't quite work as you'd expect, we'd appreciate if you filed a bug!

We need your help in order to help you. Therefore:

  1. Tell us which version of the template are you using. Where did you get the code from?
  • Specify the environment where the bug occurs i.e. which browser were you using, or which version of the Simulator or Firefox OS device. An example would be Firefox 30.0a1 Nightly 20140210. You can generally get this data from the About menu in your browser. Also maybe tell us if you have experimental features enabled in your browser (for example, support for web components).
  • Describe the problem in detail. What were you doing? What happened? What did you expect to happen?
  • Probably also provide a test case so we can see what is happening and try to reproduce the error.

Ultimately it all boils down to the fact that if we can't reproduce it, we can't help you or fix it either.


Contributions are always welcome! If you want to collaborate, whether that is with a new feature or fixing a bug, we recommend you...

  1. Have a look at the issue tracker first--to make sure there isn't anyone working on that already.
  • If it's a new issue/feature, or no one is working on it already, fork the project in GitHub (you'll need an account if you don't have one yet).
  • Create the bug to let us know you want to work on this. That way we are aware of and can keep an eye on it, or maybe tell you that it is not a bug but an intended feature, and save you the hassle of working on something that is not needed.
  • Clone your fork to your computer (i.e. get the code onto your computer)
  • Make a new branch, and switch to that new branch
  • Do the changes you deem necessary
  • Push the branch to GitHub
  • Send a pull request

To make your changes as easy to merge back onto the project as possible, you should only work on one feature per branch. That makes code review simpler and faster!