Last updated: 2019-04-11
Checks: 2 0
Knit directory: for-future-reference/
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| File | Version | Author | Date | Message |
|---|---|---|---|---|
| Rmd | 5d6218b | John Blischak | 2019-04-11 | Add notes on Shiny. |
Some notes on using Shiny from the DataCamp course Building Web Applications in R with Shiny:
To require that an input not be NULL, put req(input$n) inside of the reactive function. This is especially useful to avoid throwing an error before the user has a chance to enter a value.
To select multiple values from a potentially long list, set multiple = TRUE for the UI function selectInput(). The default selectize = TRUE will show potential values that update as the user types.
To optionally display output, put if (input$id) inside of a render function. To include UI as well, use conditionalPanel().
plotOutput(brush = "id") -> Server: brushedPoints(df, brush = input$id)plotOutput(hover = "id") -> Server: nearPoints(df, coordinfo = input$id)textOutput() (div tag) - use for normal textverbatimTextOutput() (pre tag) - use to format as codeIn UI, refer to IDs as strings. Order matters. In Server, refer to IDs as elements of list. Order doesn’t matter.
Download data - UI: downloadButton(), Server: downloadHandler()
Output arbitrary HTML that includes reactive components - UI: outputUI(), Server: renderUI()
To view reactlog, run options(shiny.reactlog = TRUE) and click Ctrl+F3 while Shiny app is open.
observe() - automatically perform side effectreactive() - automatically recalculate valueobserveEvent() - perform side effect when triggeredeventReactive() - recalculate value when triggeredthemeSelector() widget to UIui <- fluidPage(theme = shinytheme("cerulean"),Can use individual HTML tags such as p(), br(), etc. or directly write HTML with HTML().