In this post, I’ll go over a SharePoint Hosted App (Add-In) which adds/removes user custom actions at the site collection level. In Visual Studio, you are able to add custom actions, but they are scoped to the host web, not site collection. This app will also demo the new features of the gd-sprest library available on github and npm.
This post will go over adding a custom picture library to a SharePoint Hosted app.
When developing app parts, you want to focus on the main content of the page. Instead of using css and js to hide the ribbon and other parts of the page, I wanted to figure out the minimum required to use JSOM or interact with the REST API. I believe the code example below has the minimum. Please add a comment if this doesn’t work for you, or if I missed anything.