DT SearchPanes Custom Filter - r

Question

I'm trying to do something like is seen here, but I'm having trouble figuring out how to do it in Shiny. As an example, it would be great to have a filter for mtcars of "efficient" (cars with at least 15 mpg) or "inefficient" (cars with less than 15 mpg).
Here is some code:
library(shiny)
library(DT)
ui <- shinyUI(
fluidPage(DT::dataTableOutput("mtcars_table"))
)
server <- shinyServer(function(input, output, session) {
output$mtcars_table <-
DT::renderDT({
DT::datatable(
mtcars,
options = list(dom = 'Pfrtip',
columnDefs = list(
list(
searchPanes = list(show = TRUE), targets = 1
),
list(
searchPanes = list(show = FALSE), targets = 2:11
))),
extensions = c('Select', 'SearchPanes'),
selection = 'none'
)
}, server = FALSE)
})
shinyApp(ui = ui, server = server)

Answer 1

Here is something to try based on the DataTables example with custom filtering options.
For the additional list options, I included a label like "Efficient", as well as a javascript function for value (rowData[1] should reference the first column, mpg).
library(shiny)
library(DT)
ui <- shinyUI(
fluidPage(DT::dataTableOutput("mtcars_table"))
)
server <- shinyServer(function(input, output, session) {
output$mtcars_table <-
DT::renderDT({
DT::datatable(
mtcars,
options = list(
dom = 'Pfrtip',
columnDefs = list(
list(
searchPanes = list(
show = TRUE,
options = list(
list(
label = "Efficient",
value = JS(
"function(rowData, rowIdx) { return rowData[1] >= 15; }"
)
),
list(
label = "Inefficient",
value = JS(
"function(rowData, rowIdx) { return rowData[1] < 15; }"
)
)
)
),
targets = 1
),
list(
searchPanes = list(show = FALSE), targets = 2:11
)
)
),
extensions = c('Select', 'SearchPanes'),
selection = 'none'
)
}, server = FALSE)
})
shinyApp(ui = ui, server = server)