如何使滑块输入独立于内部的反应变量?
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【中文标题】如何使滑块输入独立于内部的反应变量?【英文标题】:How to make the sliderinput independant of the reactive variables inside? 【发布时间】:2021-09-12 14:15:44 【问题描述】:在这个闪亮的应用程序中,3 个 selectInputs 是链接的,如果我们在第一个 selectInput 中选择一个国家,选择的国家不会出现在第二个中,第三个也是一样的。 未选择的 2 个国家出现在滑块输入的标签中(反应变量) 当您盯着滑块输入,并在上面的 selectInputs 中修改任何国家/地区时,sliderInput 不会保留先前选择的值。
我的问题是,如何保持滑块输入独立于修改 selectInput?感谢您的帮助
ui <- fluidPage(
sidebarLayout(
sidebarPanel(
uiOutput("BoxLPbilan"),
uiOutput("BoxLPX"),
uiOutput("BoxLPY"),
uiOutput("Balance_country1"),
uiOutput("Balance_country2")
),
mainPanel (
)
)
)
server <- function(input, output)
countries<-reactive(
c('FR','DE','BE','NL','AT')
)
output$BoxLPbilan <- renderUI(
# as.character: to get names of levels and not a numbers as choices in case of factors
selectInput("countrybilan",label = tags$span(style="color: blue;","Select the balance country") ,countries())
)
liste_paysX <- reactive (
w=countries()
sort(w[!w %in% input$countrybilan])
)
output$BoxLPX <- renderUI(
# as.character: to get names of levels and not a numbers as choices in case of factors
selectInput("countryX", label = tags$span(style="color: red;","Select the country of the X axis"),liste_paysX())
)
liste_paysY <- reactive (
w=countries()
w=(w[!w %in% input$countrybilan])
sort(w[!w %in% input$countryX])
)
output$BoxLPY <- renderUI(
# as.character: to get names of levels and not a numbers as choices in case of factors
selectInput("countryY", label = tags$span(style="color: red;","Select the country of the Y axis"),liste_paysY())
)
remaining_countries <- reactive (
w=countries()
w=(w[!w %in% input$countrybilan])
w=(w[!w %in% input$countryX])
sort(w[!w %in% input$countryY])
)
output$Balance_country1 <- renderUI(
sliderInput(inputId = "remaining_country1",
paste(remaining_countries()[1]," balance"),
min = -10000,
max = 10000,
step = 100,
value = 0)
)
output$Balance_country2 <- renderUI(
sliderInput(inputId = "remaining_country2",
paste(remaining_countries()[2]," balance"),
min = -10000,
max = 10000,
step = 100,
value = 0)
)
shinyApp(ui = ui, server = server)
【问题讨论】:
所以您在 3 个selectInput
中选择了 3 个国家/地区并希望在此之后修复 sliderInput
中的两个国家/地区?
是的,但是如果我们修改 selectInput 中选择的 3 个国家,sliderInput 中的两个国家会改变。如果我在 selectInput 中修改 3 个国家/地区,我想要得到的是将滑块输入保持在选定的值中谢谢您的帮助
对不起,我还是不清楚。你能向我解释一下预期的流程吗?首先我们在 selectInput
中选择 3 个国家。下一步是什么?
下一步:我们在滑块输入中选择值,然后我们更改一开始选择的国家,因此滑块输入不保留选择的值。无论修改的国家/地区如何,我都希望将 sliderInput 保留在所选值上
如果我们从sliderInput的标签中删除反应变量我们可以做到,但我想保留反应变量并让sliderInput独立于它谢谢
【参考方案1】:
您可以使用以下技巧 -
创建一个reactiveValues
来存储sliderInput
的当前值,并将sliderInput
的默认值作为存储值传递。
library(shiny)
ui <- fluidPage(
sidebarLayout(
sidebarPanel(
uiOutput("BoxLPbilan"),
uiOutput("BoxLPX"),
uiOutput("BoxLPY"),
uiOutput("Balance_country1"),
uiOutput("Balance_country2")
),
mainPanel (
)
)
)
server <- function(input, output)
rv <- reactiveValues(val1 = 0, val2 = 0)
countries<-reactive(
c('FR','DE','BE','NL','AT')
)
output$BoxLPbilan <- renderUI(
# as.character: to get names of levels and not a numbers as choices in case of factors
selectInput("countrybilan",label = tags$span(style="color: blue;","Select the balance country") ,countries())
)
liste_paysX <- reactive (
w=countries()
sort(w[!w %in% input$countrybilan])
)
output$BoxLPX <- renderUI(
# as.character: to get names of levels and not a numbers as choices in case of factors
selectInput("countryX", label = tags$span(style="color: red;","Select the country of the X axis"),liste_paysX())
)
liste_paysY <- reactive (
w=countries()
w=(w[!w %in% input$countrybilan])
sort(w[!w %in% input$countryX])
)
output$BoxLPY <- renderUI(
# as.character: to get names of levels and not a numbers as choices in case of factors
selectInput("countryY", label = tags$span(style="color: red;","Select the country of the Y axis"),liste_paysY())
)
remaining_countries <- reactive (
w=countries()
w=(w[!w %in% input$countrybilan])
w=(w[!w %in% input$countryX])
sort(w[!w %in% input$countryY])
)
output$Balance_country1 <- renderUI(
sliderInput(inputId = "remaining_country1",
paste(remaining_countries()[1]," balance"),
min = -10000,
max = 10000,
step = 100,
value = rv$val1)
)
output$Balance_country2 <- renderUI(
sliderInput(inputId = "remaining_country2",
paste(remaining_countries()[2]," balance"),
min = -10000,
max = 10000,
step = 100,
value = rv$val2)
)
observe(
req(input$remaining_country1, input$remaining_country2)
rv$val1 <- input$remaining_country1
rv$val2 <- input$remaining_country2
)
shinyApp(ui = ui, server = server)
【讨论】:
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