Shiny 0.10 is now available on CRAN.

Interactive documents

In this release, the biggest changes were under the hood to support the creation of interactive documents. If you haven’t had a chance to check out interactive documents, we really encourage you to do so—it may be the easiest way to learn Shiny.

New layout functions

Three new functions—flowLayout(), splitLayout(), and inputPanel()—were added for putting UI elements side by side.

A new logical argument inline was also added to checkboxGroupInput() and radioButtons() to arrange check boxes and radio buttons horizontally.

Custom validation error messages

Sometimes you don’t want your reactive expressions or output renderers in server.R to proceed unless certain input conditions are satisfied, e.g. a select input value has been chosen, or a sensible combination of inputs has been provided. In these cases, you might want to stop the render function quietly, or you might want to give the user a custom message. In shiny 0.10.0, we introduced the functions validate() and need() which you can use to enforce validation conditions. This won’t be the last word on input validation in Shiny, but it should be a lot safer and more convenient than how most of us have been doing it.

See the article Write error messages for your UI with validate for details and examples.

Sever-side processing for Selectize input

In the previous release of Shiny, we added support for Selectize, a powerful select box widget. At that time, our implementation passed all of the data to the web page and used JavaScript to do any paging, filtering, and sorting. It worked great for small numbers of items but didn’t scale well beyond a few thousand items.

For Shiny 0.10, we greatly improved the performance of our existing client-side Selectize binding, but also added a new mode that allows the paging, filtering, and sorting to all happen on the server. Only the results that are actually displayed are downloaded to the client. This approach works well for hundreds of thousands or millions of rows.

For more details and examples, see the article Using selectize input on


We also split off Shiny’s HTML generating library (tags and friends) into a separate htmltools package. If you’re writing a package that needs to generate HTML programmatically, it’s far easier and safer to use htmltools than to paste HTML strings together yourself. We’ll have more to share about htmltools in the months to come.

Other changes

For the full list, you can take a look at the NEWS file. Please let us know if you have any comments or questions.