The remaining parameters are unique to the control. The third parameter is typically value, which, where possible, lets you set the default value. Shiny doesn’t place any restrictions on this string, but you’ll need to carefully think about it to make sure that your app is usable by humans! This is used to create a human-readable label for the control. Most input functions have a second parameter called label. If it’s not unique, you’ll have no way to refer to this control in your server function! Name it like you would name a variable in R. It must be a simple string that contains only letters, numbers, and underscores (no spaces, dashes, periods, or other special characters allowed!). This is the identifier used to connect the front end with the back end: if your UI has an input with ID "name", the server function will access it with input$name. The former is currently more up-to-date with modern Shiny features, whereas the latter takes a deeper, more visual, dive into fundamental concepts. For help with learning fundamental Shiny programming concepts, check out the Mastering Shiny book and the Shiny Tutorial. You can find a comprehensive, actively-maintained list of other packages at, maintained by Nan Xiao.Īs usual, we’ll begin by loading the shiny package:Īll input functions have the same first argument: inputId. For more examples and inspiration, check out the Shiny User Gallery. This lesson will get you started building Shiny apps. However, there is a rich and vibrant community of extension packages, like shinyWidgets, colorpicker, and sorttable. Shiny is an R package that makes it easy to build interactive web applications (apps) straight from R. Here I’ll mostly stick to the inputs and outputs built into Shiny itself. You don’t yet have many ways to stitch the inputs and outputs together, but we’ll come back to that in Chapter 6. This gives you the ability to capture many types of data and display many types of R output. Shiny helps you turn your analyses into interactive web applications without requiring HTML, CSS, or JavaScript knowledge. In this chapter, we’ll focus on the front end, and give you a whirlwind tour of the HTML inputs and outputs provided by Shiny. Shiny is an open source R package that provides an elegant and powerful web framework for building web applications using R. Now that you have a basic app under your belt, we can start to explore the details that make Shiny tick.Īs you saw in the previous chapter, Shiny encourages separation of the code that generates your user interface (the front end) from the code that drives your app’s behaviour (the back end).
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