Passing argument to a function in shiny R

问题

I'm trying to pass the node value of a simple network as an argument to a function in Shiny R. However, I'm getting this error:

Error in rsqlite_send_query: no such column: input$id

Can anyone help with this issue? Thanks.

library(shiny)
library(networkD3)
ui <- shinyUI(fluidPage(
fluidRow(
    column(4, simpleNetworkOutput("simple")),
    column(4, DT::dataTableOutput("table"))
)
))

server <- shinyServer(function(input, output, session) { 
  session$onSessionEnded(stopApp)
  output$simple <- renderSimpleNetwork({
  sn<-simpleNetwork(df)
  sn$x$options$clickAction = 'Shiny.onInputChange("id",d.name)'
  sn
})

 output$table <- DT::renderDataTable(DT::datatable(get(funct(input$id))))

})

shinyApp(ui = ui, server = server)

回答1:

take out the deparse and substitute from your sprintf command, and add single quotes around the value you want to match in the SQL statement you're generating
get rid of the get function because you're not trying to "get" an object

for example....

library(shiny)
library(networkD3)
library(DT)
library(sqldf)

df <- read.csv(header = T, text = '
source,name,age,hair
dad,Jon X,18,brown
dad,Jon Y,22,blonde
')

funct <-
  function (n) {
    isp <- sprintf("Select df.age From df Where df.name='%s';", n)
    isd <- sqldf::sqldf(isp)
    return(isd)
  }

ui <- shinyUI(fluidPage(
  fluidRow(
    column(4, simpleNetworkOutput("simple")),
    column(4, DT::dataTableOutput("table"))
  )
))

server <- shinyServer(function(input, output, session) { 
  session$onSessionEnded(stopApp)
  output$simple <- renderSimpleNetwork({
    sn<-simpleNetwork(df)
    sn$x$options$clickAction = 'Shiny.onInputChange("id",d.name)'
    sn
  })

  output$table <- DT::renderDataTable(DT::datatable(funct(input$id)))
})

shinyApp(ui = ui, server = server)

however, if all you want is to display a value associated with a given selection, I highly suggest drastically reducing the complexity to something like this

library(shiny)
library(networkD3)

df <- read.csv(header = T, text = '
source,name,age,hair
dad,Jon X,18,brown
dad,Jon Y,22,blonde
')

ui <- shinyUI(fluidPage(
  fluidRow(
    column(4, simpleNetworkOutput("simple")),
    column(4, textOutput("text"))
  )
))

server <- shinyServer(function(input, output, session) { 
  session$onSessionEnded(stopApp)
  output$simple <- renderSimpleNetwork({
    sn <- simpleNetwork(df)
    sn$x$options$clickAction <- 'Shiny.onInputChange("id", d.name)'
    sn
  })

  output$text <- renderPrint({ df$age[df$name == input$id] })
})

shinyApp(ui = ui, server = server)

来源：https://stackoverflow.com/questions/45558198/passing-argument-to-a-function-in-shiny-r

标签

Shiny

networkd3