我正在基于mtcars数据构建ShinyApp。我在计数值和显示 cyl button 的选择时遇到问题。 在显示按钮中选择了全部时，<圆筒>过滤器会显示准确的计数并显示选择。如果在 disp 中选择了 all 以外的其他值，则 cyl将给出0计数，并且不会显示任何选择。 有人可以看看我的代码吗？我将非常感谢。
图书馆（发光）
库（DT）
图书馆（dplyr）
图书馆（shinythemes）
库（htmlwidgets）
库（shinyWidgets）
库（shinydashboard）
data_table<-mtcars
data_table$hp<-NULL
data_table$qsec<-NULL
data_table$drat<-NULL
#ui
ui = fluidPage(
sidebarLayout(
sidebarPanel (
uiOutput("vs_selector"),
uiOutput("carb_selector"),
uiOutput("gear_selector"),
uiOutput("cyl_selector"),
valueBoxOutput("count_gear"),
valueBoxOutput("count_cyl")),
mainPanel(
DT::dataTableOutput('mytable')
)
))
#server
server = function(input, output, session) {
output$vs_selector <- renderUI({
selectInput(inputId = "vs",
label = "vs:", multiple = TRUE,
choices = c( unique(data_table$vs)),
selected = c(0))
})
output$carb_selector <- renderUI({
req(input$vs)
available0 <- data_table[c(data_table$vs %in% input$vs ), "carb"]
selectInput(
inputId = "carb",
label = "carb:",
multiple = TRUE,
choices = c('All',as.character(unique(available0))),
selected = c('4'))
})
output$gear_selector <- renderUI({
req(input$vs, input$carb)
available <- data_table[["gear"]][data_table$vs %in% input$vs]
if(! "All" %in% input$carb){
available <- available[data_table$carb %in% input$carb]
}
selectInput(
inputId = "gear",
label = "gear:",
multiple = TRUE,
choices = c('All',as.character(unique(available))),
selected = c('4'))
})
output$cyl_selector <- renderUI({
req(input$vs, input$carb, input$gear)
available <- data_table[["cyl"]][data_table$vs %in% input$vs]
selectInput(
inputId = "cyl",
label = "cyl:",
multiple = TRUE,
choices = c('All',as.character(unique(available))),
selected = c('6', '8', '4'))
})
output$count_gear <- renderValueBox({
valueBox(
value = length(unique(thedata()[["gear"]])),
subtitle = sprintf("Number of gear values" ))
})
output$count_cyl <- renderValueBox({
#req(input$vs, input$carb, input$gear)
#available <- data_table[["cyl"]][data_table$vs %in% input$vs]
valueBox(
# if("All" %in% input$cyl) {
# value = "All"
# } else(value = length(unique(input$cyl))),
value = length(unique(thedata()[["cyl"]])),
subtitle = sprintf("Number of cyl values" ))
})
thedata <- reactive({
req(input$gear, input$vs, input$carb, input$cyl)
data_table<-data_table[data_table$vs %in% input$vs,]
if(! "All" %in% input$carb){
data_table<-data_table[data_table$carb %in% input$carb,]
}
if(! "All" %in% input$gear){
data_table<-data_table[data_table$gear %in% input$gear,]
}
if(! "All" %in% input$cyl){
data_table<-data_table[data_table$cyl %in% input$cyl,]
}
data_table
})
output$mytable = DT::renderDataTable({
DT::datatable( {
thedata() # Call reactive thedata()
})
})
}
shinyApp(ui = ui, server = server)
答案 0 :(得分：0)
您可能需要找到优化代码的方法，因为它以复杂的方式完成了许多简单的事情。无论如何，这个问题已经解决了。
if条件input$cyl值更改了计数library(shiny)
library(DT)
library(dplyr)
library(shinythemes)
library(htmlwidgets)
library(shinyWidgets)
library(shinydashboard)
data_table<-mtcars
#ui
ui = fluidPage(
sidebarLayout(
sidebarPanel (
uiOutput("vs_selector"),
uiOutput("carb_selector"),
uiOutput("disp_selector"),
uiOutput("cyl_selector"),
valueBoxOutput("count_disp"),
valueBoxOutput("count_cyl")),
mainPanel(
DT::dataTableOutput('mytable')
)
))
#server
server = function(input, output, session) {
output$vs_selector <- renderUI({
selectInput(inputId = "vs",
label = "vs:", multiple = TRUE,
choices = c( unique(data_table$vs)),
selected = c(0,1))
})
output$carb_selector <- renderUI({
req(input$vs)
available0 <- data_table[c(data_table$vs %in% input$vs ), "carb"]
selectInput(
inputId = "carb",
label = "carb:",
multiple = TRUE,
choices = c('All',as.character(unique(available0))),
selected = 'All')
})
output$disp_selector <- renderUI({
req(input$vs, input$carb)
available <- data_table[["disp"]][data_table$vs %in% input$vs]
if(! "All" %in% input$carb){
available <- available[data_table$carb %in% input$carb]
}
selectInput(
inputId = "disp",
label = "disp:",
multiple = TRUE,
choices = c('All',as.character(unique(available))),
selected = c(160,108, 258, 360))
})
output$cyl_selector <- renderUI({
req(input$vs, input$carb, input$disp)
available <- data_table[["cyl"]][data_table$vs %in% input$vs]
selectInput(
inputId = "cyl",
label = "cyl:",
multiple = TRUE,
choices = c('All',as.character(unique(available))),
selected = 'All')
})
output$count_disp <- renderValueBox({
valueBox(
value = length(unique(thedata()[["disp"]])),
subtitle = sprintf("Number of disp values" ))
})
output$count_cyl <- renderValueBox({
#req(input$vs, input$carb, input$disp)
#available <- data_table[["cyl"]][data_table$vs %in% input$vs]
valueBox(
# if("All" %in% input$cyl) {
# value = "All"
# } else(value = length(unique(input$cyl))),
value = length(unique(thedata()[["cyl"]])),
subtitle = sprintf("Number of cyl values" ))
})
thedata <- reactive({
req(input$disp, input$vs, input$carb, input$cyl)
data_table<-data_table[data_table$vs %in% input$vs,]
if(! "All" %in% input$carb){
data_table<-data_table[data_table$carb %in% input$carb,]
}
if(! "All" %in% input$disp){
data_table<-data_table[data_table$disp %in% input$disp,]
}
if(! "All" %in% input$cyl){
data_table<-data_table[data_table$cyl %in% input$cyl,]
}
data_table
})
output$mytable = DT::renderDataTable({
DT::datatable( {
thedata() # Call reactive thedata()
})
})
}
shinyApp(ui = ui, server = server)
更新：
通过选择列从输出数据中获取气缸数。