R Shiny - Editing a data table inside a dynamically created bsModal - html

Question

The app below contains an actionButton Add data that inserts a UI element each time it is clicked. Each UI element is a box that contains one selectInput Select data and an actionButton Edit that opens a modal when clicked.
Each modal contains:
A data table with two columns: Parameter and Value (this column is editable).
An actionButton Apply, which applies any changes made to the Value
column.
When the user selects a dataset inside box x, a reactiveValue is created to store the corresponding parameters in a data.frame x_paramset (where x is the id of the box inserted via insertUI) and add a val column which has the same value as default (see list at the top of code below). I then use renderDataTable to add the Value column (which contains the numericInput) - this data table is displayed inside the modal.
To update the data.frame to apply any changes the user may have made in the modal, I use an observeEvent that listens for the Apply button and updates the val column in the data.frame x_paramset with the values inside the numericInputs in the Value column.
Here is the app (the bsModal has been commented out and replaced with a shinyWidgets::dropdownButton):
library(shiny)
library(shinydashboard)
library(shinyjs)
library(shinyWidgets)
library(DT)
library(tidyverse)
all = list(p1 = list(a = list(id = "a", default = 10)),
p2 = list(x = list(id = "x", default = 20)))
# UI ----------------------------------------------------------------------
ui<-fluidPage(shinyjs::useShinyjs(),
tags$head(
tags$script("
$(document).on('click', '.dropdown-shinyWidgets li button', function () {
$(this).blur()
Shiny.onInputChange('lastClickId',this.id)
Shiny.onInputChange('lastClick',Math.random())
});
")
),
box(title = "Add data",
column(width = 12,
fluidRow(
tags$div(id = 'add')
),
fluidRow(
actionButton("addbox", "Add data")
))
)
)
# SERVER ------------------------------------------------------------------
server <- function(input, output, session) {
rvals = reactiveValues()
getInputs <- function(pattern){
reactives <- names(reactiveValuesToList(input))
name = reactives[grep(pattern,reactives)]
}
observeEvent(input$addbox, {
lr = paste0('box', input$addbox)
insertUI(
selector = '#add',
ui = tags$div(id = lr,
box(title = lr,
selectizeInput(lr, "Choose data:", choices = names(all)),
shinyWidgets::dropdownButton(inputId = paste0(lr, "_settings"),
circle = F, status = "success", icon = icon("gear"), width = "1000px",
tooltip = tooltipOptions(title = "Click to edit"),
tags$h4(paste0("Edit settings for Learner", lr)),
hr(),
DT::dataTableOutput( paste0(lr, "_paramdt") ),
bsButton(paste0(lr, "_apply"), "Apply")
) # end dropdownButton
)
) #end tags$div
) # end inserUI
# create reactive dataset
rvals[[ paste0(lr, "_paramset") ]] <- reactive({
do.call(rbind, all[[ input[[lr]] ]]) %>%
cbind(., lr) %>%
as.data.frame %>%
mutate(val = default)
}) # end reactive
# render DT in modal
output[[ paste0(lr, "_paramdt") ]] <- renderDataTable({
DT <- rvals[[ paste0(lr, "_paramset") ]]() %>%
mutate(
Parameter = id,
Value = as.character(numericInput(paste0(lr,"value",id), label = NULL, value = default))) %>%
select(Parameter:Value)
datatable(DT,
selection = 'none',
#server = F,
escape = F,
options = list(preDrawCallback = JS('function() { Shiny.unbindAll(this.api().table().node()); }'),
drawCallback = JS('function() { Shiny.bindAll(this.api().table().node()); } ')))
}) # end renderDT
# Apply changes
observeEvent(input$lastClick, {
# replace old values with new
rvals[[ paste0(lr, "_paramset") ]](rvals[[ paste0(lr, "_paramset") ]]() %>%
mutate(
val = input$box1valuea
)
)
}) # end apply changes observeEvent
}) #end observeEvent
}
shinyApp(ui=ui, server=server)
I encounter errors when I try the following:
Add data >> Edit >> make some change to numericInput >> Apply - this
resets the numericInput inside the modal back to its default whereas
I would like the user-specified value to persist upon applying
changes or closing the modal.
The app crashes when I try:
Add data >> Edit >> Apply >> close modal >> Add data OR
Click Add data twice and then click Edit in either box.
I am not sure where my server logic is failing. I know Shiny does not support "persistent use" modals (https://github.com/rstudio/shiny/issues/1590) but I was wondering if there was a workaround? I am also not sure what inside the insertUI observeEvent is causing the app to crash in the cases described above. Any help you can offer would be greatly appreciated!