在Shiny App中,我有一个看似很小但很棘手的问题。
该应用程序旨在显示选择公司时的lineChart,并在选择“全部”时显示所有公司的条形图。例如,选择:
按类别1 = 3过滤并按类别1:2过滤ui,只有4家公司留在公司下拉,我希望能够选择公司中的公司A下拉以获得折线图对于公司A.
问题在于,当我选择公司A时,它会显示公司A的lineChart 1秒钟,然后跳回“All”。
我认为问题在于以下几行:
output$firm <- renderUI({
selectInput("firm", "Filter by Firm:",
choices = c("All",as.character(unique(subset_data()$FIRM))))
})
我要求的选择是“全部”和“公司X”。它首先为公司X创建lineChart,然后在“All”下创建图表。因此,我试图从选择中删除“全部”,但这不起作用。
任何帮助非常感谢! 感谢
这是一个可重复的例子:
首先创建样本数据:
set.seed(1)
df <- data.frame(FIRM=rep(LETTERS[1:7],each=10), CATEG_1=rbinom(70,4,0.9),CATEG_2=rbinom(70,1,0.2),date=as.Date("2014-01-01")+1:10,y1=sample(1:100,70))
ShinyApp:
library(shiny)
library(rCharts)
library(doBy)
library(plyr)
shinyApp(ui =
shinyUI(pageWithSidebar(
# Application title
headerPanel("Example"),
sidebarPanel(
uiOutput("firm"),
# selectInput("firm", "Filter by firm:",
# choices = unique(as.character(df))),
selectInput("categ_1", "Filter by Category 1:",
choices = c("All",unique(as.character(df$CATEG_1)))),
selectInput("date", "Filter by Date:",
choices = c("All","Last 28 Days","Last Quarter")),
selectInput("categ_2", "Filter by Category 2:",
choices = c("All",unique(as.character(df$CATEG_2))))
), #sidebarPanel
mainPanel(
h4("Example plot",style = "color:grey"),
showOutput("plot", "nvd3")
) # mainPanel
) #sidebarLayout
) #shinyU
,
server = shinyServer(function(input, output, session) {
subset_data <- reactive({df <- filter_data(df,input$firm,
input$date,
input$categ_1,
input$categ_2)
shiny::validate(need(!is.null(df),"No data to display"))
return(df)})
output$firm <- renderUI({
selectInput("firm", "Filter by Firm:",
choices = c("All",as.character(unique(subset_data()$FIRM))))
})
output$plot<-renderChart2({ build_plot(subset_data()) })
##############
#below are the functions used in the code
##############
# function for date subsetting
filter_date<-function(df,dateRange="All"){
filt <- df
td <- max(as.Date(filt$date))
if (dateRange=='Last 28 Days'){filt <-filt[filt$date>=(td-28),]}
if (dateRange=='Last Quarter'){filt <-filt[filt$date>=(td-84),]}
return(filt)
} # filter by date
# function for data subsetting
filter_data<-function(df,firm=NULL,dateRange="All",categ_1=NULL,categ_2=NULL)
{
filt<-filter_date(df,dateRange)
if (!is.null(firm)) {
if(firm!='All') {filt <- filt[filt$FIRM==firm,]}
}
if (!is.null(categ_1)){
if (categ_1!='All') {filt <- filt[filt$CATEG_1==categ_1,]}
}
if (!is.null(categ_2)) {
if (categ_2!='All') {filt <- filt[filt$CATEG_2==categ_2,]}
}
if(nrow(filt)==0) {filt <- NULL}
return(filt)
} # prepare data to be plotted
# function to create plot
build_plot <- function(df) {
plotData<-df
# If 1 partner selected, time series is shown
if (length(as.character(unique(plotData$FIRM)))==1) {
tabledta<-summaryBy(y1~FIRM+date,data=plotData,FUN=sum,keep.names=TRUE)
filler = expand.grid(FIRM=as.character(unique(df$FIRM)),
date=seq(min(tabledta$date),max(tabledta$date),by='1 day'))
df = merge(filler,
tabledta,
by=c('date','FIRM'),
all.x=T)
df[is.na(df)]=0
p <- nPlot(y1 ~ date, group = 'FIRM', data = df, type = 'lineChart')
p$chart(margin=list(left=150))
p$yAxis(showMaxMin = FALSE)
p$xAxis(tickFormat ="#!function(d) {return d3.time.format('%Y-%m-%d')(new Date(d * 24 * 60 * 60 * 1000));}!#")
p
}
# If "All" partners are selected, barchart of Top 5 is shown
else{
SummaryTab<-aggregate(y1~FIRM,data=plotData,FUN=sum)
SummaryTab$rank=rank(SummaryTab$y1)
SummaryTab$rank[SummaryTab$rank>5]<-6
if (length(SummaryTab$rank)>5) {
#Top 5 partners in terms of y1 are shown
top5<-SummaryTab[SummaryTab$rank<=5,]
# other partners are collapsed, shown as 1 entry
others<-aggregate(y1~rank,data=SummaryTab,FUN=sum)
others<-others[others$rank==6,]
others$FIRM<-"Others"
# Create the summarytable to be plotted
plotData=rbind(top5,others)}
tabledta<-summaryBy(y1~FIRM,data=plotData,FUN=sum,keep.names=TRUE)
tabledta<-arrange(tabledta,y1)
# if(is.null(tabledta)) {print("Input is an empty string")}
p <- nPlot(y1 ~ FIRM,data = tabledta, type = 'multiBarHorizontalChart')
p$chart(margin=list(left=150))
p$yAxis(showMaxMin = FALSE)
p
}
}
}) #shinyServer
)
答案 0 :(得分:6)
问题是输出$ firm在您的代码中是自我反应的,因为它取决于输入$ firm。
输出$ firm表达式为输入$ firm生成一个用户界面,它自动触发所有依赖于输入$ form的反应式表达式的重新评估。其中一个反应式表达式是输出$ firm本身(它取决于输入$ firm通过subset_data()),因此每次调用输出$ firm将导致其递归重新评估。
您需要隔离subset_data()表达式,这将阻止触发subset_data()中的更改:
output$firm <- renderUI({
input$date
input$categ_1
input$categ_2
selectInput("firm", "Filter by Firm:",
choices = c("All",as.character(unique(isolate(subset_data()$FIRM)))))
})
请注意,我插入了几个输入$ ...行,以确保输出$ firm将触发这些输入的任何更改。