Register shiny checkboxInput value on DT - r

Question

I am able to embed checkbox in each cell of a DT column from reading this post.
Imagine I have a dataframe with a logical column named "value" containing some TRUE values, and I want the checkbox in "value_check" column to appear as checked for those that are TRUE upon app start, like shown below: How would I do so?
library(shiny)
library(DT)
df <- data.frame(item = c("a", "b", "c"), value = c(TRUE, NA, NA))
shinyInput <- function(FUN, len, id, ...) {
inputs <- character(len)
for (i in seq_len(len)) {
inputs[i] <- as.character(FUN(paste0(id, i), label = NULL, ...))
}
inputs
}
## obtaining checkbox value
shinyValue = function(id, len) {
unlist(lapply(seq_len(len), function(i) {
value = input[[paste0(id, i)]]
if (is.null(value)) FALSE else value
}))
}
server <- function(input, output, session) {
output$tbl <- renderDT(server = FALSE, escape = FALSE, editable = TRUE, options = list(
dom = 't', paging = FALSE, ordering = FALSE,
preDrawCallback = JS('function() { Shiny.unbindAll(this.api().table().node()); }'),
drawCallback = JS('function() { Shiny.bindAll(this.api().table().node()); } ')
), {
df$value_check <- shinyInput(checkboxInput, nrow(df), "check")
df
}
)
}
ui <- fluidPage(
DTOutput("tbl")
)
shinyApp(ui, server)

Answer 1

I thought I had a solution but now I'm afraid I misunderstood your question. With the code below, the values in the value column are updated according to the status of the corresponding checkbox in the value_check column.
js <- c(
"$('[id^=check]').on('click', function(){",
" var id = this.getAttribute('id');",
" var i = parseInt(/check(\\d+)/.exec(id)[1]);",
" var value = $(this).prop('checked');",
" var cell = table.cell(i-1, 2).data(value).draw();",
"})"
)
then
output$tbl <- renderDT(server = FALSE, escape = FALSE, editable = TRUE,
callback = JS(js),
options = list(
dom = 't', paging = FALSE, ordering = FALSE,
preDrawCallback = JS('function() { Shiny.unbindAll(this.api().table().node()); }'),
drawCallback = JS('function() { Shiny.bindAll(this.api().table().node()); } ')
), {
df$value_check <- shinyInput(checkboxInput, nrow(df), "check")
df
}
)
But now I understand that you ask for the "converse" : check the checkbox according to the value in the value column. Right ? However don't you need the above as well ?
Then, to answer your question as I understand it now, I would do:
shinyCheckboxes <- function(len, id, checked){
inputs <- character(len)
for (i in seq_len(len)) {
inputs[i] <- as.character(checkboxInput(paste0(id, i), label=NULL,
value = checked[i]))
}
inputs
}
then
checked <- sapply(df$value, isTRUE)
df$value_check <- shinyCheckboxes(nrow(df), "check", checked)
Is it what you want ?