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From YouTube: PnP WebCast - Building multi-view Angular 1.x client-side web parts with SharePoint Framework

Description

In this PnP Webcast, we concentrated on covering the considerations around multi-view web parts, where the presentation layer is changed based on the status of the web part. Typically single-page application solutions are implemented in away that they store the view status within the URL. Since client-side web parts are however hosted in SharePoint pages, this is not possible and you'll need to use alternative approaches for maintaining the UI state in your customizations. Considerations are being also demonstrated with a client-side web part built with Angular 1.x.

Additional details from http://dev.office.com/blogs