我已经阅读了这篇文章(How do I make the choices in radioButtons reactive in Shiny?),它向我展示了如何以被动的方式更新radioButton
。但是,当我尝试从同一数据更新两组按钮时,只有一组渲染。例如:
服务器:
# Create example data
Wafer <- rep(c(1:3), each=3)
Length <- c(1,1,2,1,1,1,3,5,1)
Width <- c(3,1,6,1,1,1,1,1,6)
dd <- data.frame(Wafer, Length, Width)
shinyServer(function(input, output, session){
# Create reactive dataframe to store data
values <- reactiveValues()
values$df <- data.frame()
# Get Lengths and Widths of wafer from user input
a <- eventReactive(input$do, {
subset(dd, Wafer %in% input$wafer, select = Length:Width)
})
# Update reactive data frame will all Lengths and Widths that have been selected by the user input
observe({
if(!is.null(a())) {
values$df <- rbind(isolate(values$df), a())
}
})
output$wl <- renderDataTable({ a() })
# Update radio buttons with unique Length and Widths stored in values$df
# Which ever "observe" I put first in the code, is the one which updates
# the radio buttons. Cut and paste the other way round and "width"
# updates but not "length" radio buttons
observe({
z <- values$df
updateRadioButtons(session, "length", choices = unique(z$Length), inline=TRUE)
})
observe({
z <- values$df
updateRadioButtons(session, "width", choices = unique(z$Width), inline=TRUE)
})
})
UI:
library(markdown)
shinyUI(fluidPage(
titlePanel("Generic grapher"),
sidebarLayout(
sidebarPanel(
numericInput("wafer", label = h3("Input wafer ID:"), value = NULL),
actionButton("do", "Search wafer"),
radioButtons("length", label="Length", choices=""),
radioButtons("width", label="Width", choices = "")
),
mainPanel(
dataTableOutput(outputId="wl")
)
)
)
)
在上面,radiobutton确实更新,但仅按代码的顺序更新第一组按钮,即&#34;长度&#34;更新,但&#34;宽度&#34;没有按&#39;吨。如果我反向写它们,&#34;宽度&#34;更新,但&#34;长度&#34;没有按&#39;吨。我是否需要定义新会话?
答案 0 :(得分:0)
事实证明:
&#34;它是因为如果choice参数不是一个JS错误就会发生 字符向量。&#34;
我在Shiny&#39; Github上发布了一个问题:
https://github.com/rstudio/shiny/issues/1093
这可以通过以下方式解决:
要解决您的问题,您可以将选择转换为字符 使用as.character或set选择随机字符串,例如&#34;&#34;。
请参阅: