How to render dynamic UIs based on user selection with shiny - r

Question

Given the set of shiny UIs and their differings arguments (to be read from a rdf, here given as explicit lists) how can the user select a desired type of input (for a data-model with many different inputs, all presetted with defaults) to be changed?
library(shiny)
library(shinyWidgets)
library(DT)
library(purrr)
library(dplyr)
library(data.table)
#-----------------someWidgetsAndArguments-------------------.
inputWidget <- list("selectInput", "sliderInput", "textInput", "numericInput")
inpWidgArgs <- list(list(inputId = "inpUI01", label = "seInp01", choices = "seq(1,20,1)", selected = 10),
list(inputId = "inpUI02", label = "slInp02", min= 0, max = 100, value = "c(25,75)" ),
list(inputId = "inpUI03", label = "txInp03", value = "enter some text"),
list(inputId = "inpUI04", label = "nrInp04", value = 1000000) )
#----------------presetPickerInput---------------------
if (interactive()) {
ui <- fluidPage(
sidebarLayout(
sidebarPanel(
pickerInput(inputId = "pkInp01",
label = "Select CF-Model Inputs for change",
choices = inputWidget,
selected = inputWidget[1:2],
multiple = TRUE,
options = list(`actions-box` = TRUE,
`selected-text-format`= "count",
`count-selected-text` = "{0} inputs of {1} selected") ),
uiOutput("inpUI"),
),
mainPanel(
dataTableOutput("table01")
)
)
)
#-----------------generateArguments4invoke_map---------------------------.
server <- function(input, output, session) {
#B: obs <- reactiveValues(
#A: pckdWdgt <- inputWidget[match(input$pkInp01, inputWidget)],
#A: wdgtArgs <- inpWidgArgs[match(input$pkInp01, inputWidget)]
#B: )
#B: observe({
#B: obs$pW01 = inputWidget[match(input$pkInp01, inputWidget)]
#B: obs$wA02 = inpWidgArgs[match(input$pkInp01, inputWidget)]
#B: })
#------------------renderAsManyInputUisAsPicked------------
output$inpUI <- renderUI({
#A: invoke_map(match.fun(pckdWdgt), wdgtArgs)
#B: invoke_map(match.fun(obs$pW01), obs$WA02)
invoke_map(list(selectInput, sliderInput), list(
list(inputId = "inpUI01", label = "selectInput01", choices = seq(1,20,1), selected = 10),
list(inputId = "inpUI02", label = "sliderInput02", min= 0, max = 100, value = c(25,75) )
)
)
})
}
}
#-----------------------------------------------------
shinyApp(ui, server)
With map() or invoke_map() it should be possible to pass the type of function/UIinput and its arguments (compare: https://hadley.shinyapps.io/ms-render-palette-full).
Two approaches (A: and B:) below fail (possible reason: environment/namespace?) Any suggestion highly appreciated.
Many thanks in advance

Answer 1

I cleaned some of your code and created the solution. To start a few minor things: The choices argument in seInp01 shouldn't be between quotations. The same goes for the value argument in slInp01. Lastly there is a trailing comma behind your uiOutput argument in the UI. For the functionality of the code I just put some codes that you already came up with in the right place, you had the right idea.
The code:
library(shiny)
library(shinyWidgets)
library(DT)
library(purrr)
library(dplyr)
library(data.table)
#-----------------someWidgetsAndArguments-------------------.
inputWidget <- list("selectInput", "sliderInput", "textInput", "numericInput")
inpWidgArgs <- list(list(inputId = "inpUI01", label = "seInp01", choices = seq(1,20,1), selected = 10),
list(inputId = "inpUI02", label = "slInp02", min= 0, max = 100, value = c(25,75) ),
list(inputId = "inpUI03", label = "txInp03", value = "enter some text"),
list(inputId = "inpUI04", label = "nrInp04", value = 1000000) )
#----------------presetPickerInput---------------------
if (interactive()) {
ui <- fluidPage(
sidebarLayout(
sidebarPanel(
pickerInput(inputId = "pkInp01",
label = "Select CF-Model Inputs for change",
choices = inputWidget,
selected = inputWidget[1:2],
multiple = TRUE,
options = list(`actions-box` = TRUE,
`selected-text-format`= "count",
`count-selected-text` = "{0} inputs of {1} selected") ),
uiOutput("inpUI")
),
mainPanel(
dataTableOutput("table01")
)
)
)
#-----------------generateArguments4invoke_map---------------------------.
server <- function(input, output, session) {
#------------------renderAsManyInputUisAsPicked------------
output$inpUI <- renderUI({
wdgtArgs <- inpWidgArgs[match(input$pkInp01, inputWidget)]
invoke_map(input$pkInp01, wdgtArgs)
})
}
}
#-----------------------------------------------------
shinyApp(ui, server)