Accordion reports `NULL` value during panel switch when `multiple = TRUE`
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Description
In the following app code, which throttles the accordion's reported value, you can see that when one panel is active and you activate another panel, the accordion input value briefly reports a NULL state.
Reprex code
library(shiny)
library(bslib)
ui <- page_fluid(
layout_columns(
accordion(
id = "accordion",
multiple = FALSE,
accordion_panel("One", "First panel"),
accordion_panel("Two", "Second panel"),
),
verbatimTextOutput("debug")
)
)
server <- function(input, output) {
accordion_value <- throttle(reactive(input$accordion), 1000)
output$debug <- renderPrint(accordion_value())
}
shinyApp(ui, server)
https://github.com/rstudio/bslib/assets/5420529/ed70dbaa-fdf0-41cc-9ddd-2d3061e8742f
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by running the provided Shiny reprex with bslib's accordion() and its throttled reactive value, then trace the accordion input updates during a panel switch. Done means switching panels with multiple selection enabled no longer produces a transient NULL value in the reported accordion input.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- r
- Domain
- frontend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100