R中闪亮的反应选择输入
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【中文标题】R中闪亮的反应选择输入【英文标题】：Shiny reactive selectInput in R 【发布时间】：2020-07-04 22:44:21 【问题描述】：我有一个包含反应数据的闪亮应用程序。我希望应用程序只为 X 和 Y 轴选择非空列。目前我在colnames(TD[,3:7]) 之间进行选择，但列也有空值，所以我不希望这些列显示为变量选择。下面是一个例子和我的代码：
type <- as.character(c('summer','summer','summer','summer','winter','winter','winter','winter'))
country <- as.character(c('A','A','B','B','A','A','B','B'))
year <- c(2011,2012,2013,2014,2011,2012,2013,2014)
col1 <- c(33,7,NA,NA,5,11,NA,NA)
col2 <- c(10,3,NA,NA,8,15,NA,NA)
col3 <- c(NA,NA,10,15,NA,NA,20,25)
col4 <- c(NA,NA,8,5,NA,NA,22,16)
TD <- data.frame(type,country,year,col1,col2,col3,col4,stringsAsFactors=FALSE)
library(readxl)
library(shiny)
library(ggplot2)
library(shinythemes)
library(DT)
ui <-shinyUI(fluidPage(pageWithSidebar(
headerPanel("Test App"),
sidebarPanel(
selectInput("type","Choose a type", choices = c("All",unique(TD$type))),
selectInput("country","Choose an country", choices = c("All",unique(TD$country))),
selectInput("yaxis", "Choose a y variable", choices = colnames(TD[,3:7])),
selectInput("xaxis", "Choose a x variable", choices = colnames(TD[,3:7])),
actionButton("goButton", "Update")
),
mainPanel(
tabsetPanel(
tabPanel('Plot', plotOutput("plot1"))
))
)
))
server <- shinyServer(function(input,output, session)
data1 <- reactive(
if(input$type == "All")
TD
else
TD[which(TD$type == input$type),]
)
data2 <- eventReactive(input$goButton,
if (input$country == "All")
TD
else
TD[which(TD$country == input$country),]
)
observe(
if(input$type != "All")
updateSelectInput(session,"country","Choose a country", choices = c("All",unique(data1()$country)))
else if(input$country != 'All')
updateSelectInput(session,"type","Choose a type", choices = c('All',unique(data2()$type)))
else if (input$type == "All" & input$country == "All")
updateSelectInput(session,"country","Choose a country", choices = c('All',unique(TD$country)))
updateSelectInput(session,"type","Choose a type", choices = c('All',unique(TD$type)))
)
data3 <- eventReactive( input$goButton,
req(input$goButton)
req(input$goButton)
if(input$country == "All")
data1()
else if (input$type == "All")
data2()
else if (input$country == "All" & input$type == "All")
TD
else
TD[which(TD$country== input$country & TD$type == input$type),]
)
x_var<- eventReactive(input$goButton,
input$xaxis
)
y_var <- eventReactive(input$goButton,
input$yaxis
)
output$plot1 <- renderPlot(
x <- x_var()
y <- y_var()
p <- ggplot(data3(),aes(x=data3()[,x], y=data3()[,y])) + geom_line() + geom_point()
p + labs(x = x_var(), y = y_var()) + theme(plot.title = element_text(hjust = 0.5, size=20))
)
)
shinyApp(ui,server)
【问题讨论】：
col3 和 col4 在你的例子中不是空的，所以我不明白你的意思。 “空”是什么意思？
啊，我想我现在明白了。 col3 仅缺少 Country A 的值。
【参考方案1】：
这是一种方法。它使用 selectize 插件 disable_options。
下载插件here。将其保存在应用文件夹的 www 子文件夹中的名称 selectize-disable-options.js 下。
然后这里是应用程序：
library(shiny)
library(ggplot2)
CSS <- "
.selectize-dropdown [data-selectable].option-disabled
color: #aaa;
cursor: default;
"
type <- as.character(c('summer','summer','summer','summer','winter','winter','winter','winter'))
country <- as.character(c('A','A','B','B','A','A','B','B'))
year <- c(2011,2012,2013,2014,2011,2012,2013,2014)
col1 <- c(33,7,NA,NA,5,11,NA,NA)
col2 <- c(10,3,NA,NA,8,15,NA,NA)
col3 <- c(NA,NA,10,15,NA,NA,20,25)
col4 <- c(NA,NA,8,5,NA,NA,22,16)
TD <- data.frame(type,country,year,col1,col2,col3,col4,stringsAsFactors=FALSE)
ui <- fluidPage(
tags$head(
tags$script(src = "selectize-disable-options.js"),
tags$style(html(CSS))
),
titlePanel("Test App"),
sidebarLayout(
sidebarPanel(
selectInput("type","Choose a type", choices = c("All",unique(TD$type))),
selectInput("country","Choose an country", choices = c("All",unique(TD$country))),
selectizeInput("yaxis", "Choose a y variable", choices = colnames(TD[,3:7])),
selectInput("xaxis", "Choose a x variable", choices = colnames(TD[,3:7])),
actionButton("goButton", "Update")
),
mainPanel(
tabsetPanel(
tabPanel('Plot', plotOutput("plot1"))
)
)
)
)
server <- function(input, output, session)
data1 <- reactive(
if(input$type == "All")
TD
else
TD[TD$type == input$type,]
)
data2 <- reactive(
if(input$country == "All")
TD
else
TD[TD$country == input$country,]
)
observe(
if(input$type != "All")
selected_country <- isolate(input$country)
countries <- unique(data1()$country)
updateSelectInput(
session, "country",
choices = c("All", countries),
selected = ifelse(selected_country %in% countries, selected_country, "All")
)
else if(input$country != 'All')
selected_type <- isolate(input$type)
types <- unique(data2()$type)
updateSelectInput(
session, "type",
choices = c('All', types),
selected = ifelse(selected_type %in% types, selected_type, "All")
)
else if(input$type == "All" && input$country == "All")
updateSelectInput(
session, "country",
choices = c('All', unique(TD$country))
)
updateSelectInput(
session, "type",
choices = c('All', unique(TD$type))
)
)
data3 <- reactive(
if(input$country == "All")
data1()
else if(input$type == "All")
data2()
else if(input$country == "All" && input$type == "All")
TD
else
TD[which(TD$country== input$country & TD$type == input$type),]
)
observeEvent(data3(),
emptyColumns <- sapply(data3()[,3:7], function(x)
all(is.na(x))
)
choices <- colnames(TD[,3:7])
choices[emptyColumns] <- paste(choices[emptyColumns], "(no data)")
updateSelectizeInput(
session, "yaxis", choices = choices,
options = list(
plugins = list(
disable_options = list(
disableOptions = as.list(choices[emptyColumns])
)
)
)
)
)
data4 <- eventReactive(input$goButton,
data3()
)
x_var<- eventReactive(input$goButton,
input$xaxis
)
y_var <- eventReactive(input$goButton,
input$yaxis
)
output$plot1 <- renderPlot(
x <- x_var()
y <- y_var()
p <- ggplot(data4(), aes_string(x=x, y=y)) + geom_line() + geom_point()
p + labs(x = x, y = y) + theme(plot.title = element_text(hjust = 0.5, size=20))
)
shinyApp(ui,server)
选择输入中的空列被禁用：
【讨论】：
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