【发布时间】：2019-02-15 02:12:12
【问题描述】：
背景：在我的应用程序中，我构建了一个弹出模式，用户可以在其中定义变量/参数，然后在按下actionButton 后将它们存储在reactiveValues() 中。这似乎工作正常。
问题：我有一个单独的actionButton，它应该清除/清空保存上述输入的reactiveValues。不幸的是，这似乎不起作用——也就是说，按下按钮没有任何作用。
最少可重现的代码：
library(DT)
# UI modules
sidebarCharts <- function(id) {
ns <- NS(id)
tagList(
p(),
actionButton(ns("settings"), "Settings",
icon = icon("cogs"),
width = '100%',
class = "btn btn-info"),
p(),
actionButton(ns("refreshMainChart") ,"Refresh",
icon("refresh"),
width = '100%',
class = "btn btn-primary"),
p(),
textOutput(ns("info")) # FOR DEBUGGING
)
}
mainChartUI <- function(id) {
ns <- NS(id)
plotOutput(ns("mainChart"), width = "100%")
}
# UI module for the 2 buttons in the modal:
modalFooterUI <- function(ns) {
tagList(
modalButton("Cancel", icon("remove")),
actionButton(ns("modalApply"), "Apply",
icon = icon("check"))
)
}
# module server
modal <- function(input, output, session) {
# Init reactiveValues() to store default values and updated values; https://github.com/rstudio/shiny/issues/1588
rv <- reactiveValues(clicks = 0,
applyClicks = 0,
bins = 20,
bandwidth = 1)
reactiveBlotter <- reactiveValues() # Empty reactiveValues()
# DEBUGGING
output$info <- renderText({
paste("You clicked the 'Settings' button",
rv$clicks,
"times. You clicked the 'Apply' button",
rv$applyClicks,
"times. The bin size is currently set to",
rv$bins,
"and the bandwidth is currently set to",
rv$bandwidth)
})
settngsModal <- function(ns) {
modalDialog(
withTags({ # UI elements for the modal go in here
fluidPage(
# titlePanel("Modal title optional"),
sidebarLayout(
sidebarPanel(
selectInput(ns("n_breaks"),
label = "Number of bins:",
choices = c(10, 20, 35, 50),
selected = rv$bins, width = '100%'),
sliderInput(ns("bw_adjust"),
label = "Bandwidth adjustment:",
min = 0.2,
max = 2,
value = rv$bandwidth,
step = 0.2, width = '100%'),
textInput(ns("testInputName"),
label = "Name",
width = '100%'),
selectInput(ns("testInput"),
label = "Test Input",
choices = c('A','B','C'),
width = '100%'),
selectInput(ns("testInput2"),
label = "Test Input 2",
choices = c('D','E','F'),
width = '100%'),
actionButton(ns("addToRV"),
label = 'Add to reactiveValues'),
p(),
actionButton(ns("clearRV"),
label = 'Clear reactiveValues')
),
mainPanel(
# "Blotter table goes here.",
fluidRow(
DT::DTOutput(ns("blotterDT"))
)
)
)
)
}),
title = "Settings",
footer = modalFooterUI(ns),
size = "l",
easyClose = FALSE,
fade = TRUE)
}
# Sidebar 'Settings' modal
observeEvent(input$settings, {
showModal(settngsModal(session$ns)) # This opens the modal; settngsModal() defined below
rv$clicks <- rv$clicks + 1 # FOR DEBUGGING
})
observeEvent(input$modalApply, {
rv$applyClicks <- rv$applyClicks + 1 # FOR DEBUGGING
rv$bins <- input$n_breaks # This is where I set the reactiveValues() to those inputted into the modal.
rv$bandwidth <- input$bw_adjust
removeModal() # This should dismiss the modal (but it doesn't seem to work)
})
observeEvent(input$addToRV, {
req(input$testInputName, input$testInput, input$testInput2)
reactiveBlotter[[input$testInputName]] <- list(testInputName = input$testInputName,
testInput = input$testInput,
testInput2 = input$testInput2)
})
observeEvent(input$clearRV, {
reactiveBlotter <- reactiveValues() # This is the part that doesn't seem to work
})
blotterDf <- reactive({
do.call("rbind", lapply(reactiveBlotter, FUN = function(x) {
data.frame(name = x[["testInputName"]],
input1 = x[["testInput"]],
input2 = x[["testInput2"]])
}))
})
output$blotterDT <- DT::renderDT({
validate(need(length(names(reactiveBlotter)) > 0,
"Add something to the blotter."))
DT::datatable(blotterDf(),
style = 'bootstrap',
class = 'table-bordered table-condensed',
rownames = TRUE,
options = list(dom = 't',
paging = F)
)
})
output$mainChart <- renderPlot({
input$refreshMainChart # Take dependency on the 'Refresh' buton
hist(faithful$eruptions, probability = TRUE,
breaks = as.numeric(rv$bins),
xlab = "Duration (minutes)",
main = "Geyser Eruption Duration")
dens <- density(faithful$eruptions, adjust = rv$bandwidth)
lines(dens, col = "blue")
})
}
# Define UI
ui <- fluidPage(
# Application title
titlePanel("stackoverflow example"),
sidebarLayout(
sidebarPanel(
sidebarCharts("main")
),
mainPanel(
mainChartUI("main")
)
)
)
# Server logic
server <- function(input, output) {
callModule(modal, "main")
}
# Complete app with UI and server components
shinyApp(ui, server)
我在这里缺少什么？非常感谢任何帮助！
【问题讨论】：
标签： r shiny shinydashboard shinyjs shiny-reactivity