radioGroupButtons() from shinyWidgets broken in Shiny 1.11.0 – “Unexpected input value mode: 'undefined'” error

[kathrinramsmeier]

After updating to Shiny 1.11.0, radioGroupButtons() from the shinyWidgets package no longer works correctly. It was working as expected with Shiny 1.10.0.

When launching the app, I receive the following JavaScript console error:

inputValidateDecorator.ts:16 Uncaught Error: Unexpected input value mode: 'undefined'

This occurs even with minimal code, shown below.

Minimal reproducible example:

library(shiny)
library(shinyWidgets)

ui <- fluidPage(
  h3("Test radioGroupButtons"),
  radioGroupButtons(
    inputId = "choice",
    label = "Choose one:",
    choices = c("Option 1", "Option 2", "Option 3"),
    justified = TRUE,
    status = "primary"
  ),
  verbatimTextOutput("selected")
)

server <- function(input, output, session) {
  output$selected <- renderPrint({
    input$choice
  })
}

shinyApp(ui, server)

Environment:

• shiny version: 1.11.0
• shinyWidgets version: 0.9.0
• Browser: Chrome 135.0.7049.97
• OS: Linux Ubuntu 20.04.6 LTS

Notes:

• Downgrading to Shiny 1.10.0 resolves the issue.
• Possibly related to recent changes regarding input value validation or submit button handling (#4209).
• May also be related to an open issue in shinyWidgets: dreamRs/shinyWidgets#741.

Would appreciate any help or clarification on this. Thank you for your work on Shiny!

[gadenbuie]

Thanks for reporting and for taking the time to include a detailed reprex! This was originally reported in #4240 and will be fixed by #4243. We'll get a patch release out as soon as we can.