[英]DT::replaceData() only executing once in observe()
I'm writing a simple shiny app that generates a table of random numbers every 5 seconds. 我正在编写一个简单的闪亮应用程序,该应用程序每5秒生成一个随机数表。 I first insert dummy values to the table then edit the table within an
observe()
loop using replaceData()
. 我首先将虚拟值插入表中,然后使用
replaceData()
在observe()
循环中编辑表。 When I run the app I see that the table gets populated with random numbers (which must come from the replaceData()
call) but the table does not get re-populated every 5 seconds after that. 当我运行该应用程序时,我看到该表填充了随机数(必须来自
replaceData()
调用),但是replaceData()
并没有每隔5秒重新填充该表。 It appears that all subsequent calls to replaceData()
within the observe()
function are ignored. 看来,
observe()
函数中对replaceData()
所有后续调用都将被忽略。
Does anyone have any suggestions/ideas as to what might be causing this? 是否有人对造成此问题有任何建议/想法?
app.R 应用程序
library(shiny)
library(DT)
library(data.table)
source("module.R")
ui <- fluidPage(
testTableUI('first')
)
server <- function(input, output, session){
callModule(testTable, 'first')
}
shinyApp(ui = ui, server = server)
module.R 模块
testTable <- function(input, output, session){
# insert dummy values into the table
dummyDT = data.table(a=1:5, b=1:5, c=1:5)
output$testTable <- renderDataTable({dummyDT})
# trigger every 5 seconds in observe() to generate a new table
invalidateTable <- reactiveTimer(5000)
testTableProxy <- dataTableProxy(session$ns('testTable'))
observe({
invalidateTable()
print('Updating table...')
a_vals <- sample(1:100, 5)
b_vals <- sample(1:100, 5)
c_vals <- sample(1:100, 5)
newDT = data.table(a=a_vals, b=b_vals, c=c_vals)
print(newDT)
# only updates table once
replaceData(testTableProxy, newDT)
})
}
testTableUI <- function(id){
ns = NS(id)
dataTableOutput(ns("testTable"))
}
Software specs: 软件规格:
R: 3.5.2 R:3.5.2
shiny: 1.2.0 闪亮的:1.2.0
DT: 0.5 DT:0.5
Replace 更换
testTableProxy <- dataTableProxy(session$ns('testTable'))
with 与
testTableProxy <- dataTableProxy('testTable')
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