Javascript 闪亮:删除行的次数不能超过1次
我正在开发一款闪亮的应用程序。server.R包含如下代码Javascript 闪亮:删除行的次数不能超过1次,javascript,r,datatables,shiny,Javascript,R,Datatables,Shiny,我正在开发一款闪亮的应用程序。server.R包含如下代码 dFt1 <- reactiveValues() dFt1$dat <- data.frame(loadTransactionData()) ... output$t_tab_1 <- DT::renderDataTable({ DT::datatable( dFt1$dat ,selection = list(mode = "single") ,options
dFt1 <- reactiveValues()
dFt1$dat <- data.frame(loadTransactionData())
...
output$t_tab_1 <- DT::renderDataTable({
DT::datatable(
dFt1$dat
,selection = list(mode = "single")
,options = list(
rownames = TRUE
,pageLength = 10
,order = list(list(2,"desc"),list(1,"asc"))
)
)
})
...
observe({
if (is.null(input$delete) || input$delete == 0){return()}
session$sendCustomMessage(
type = 'jsCode'
,list(value = 'confirm("Are You Sure?");')
)
})
observeEvent(input$deleteConfirmChoice, {
if (input$deleteConfirmChoice == "TRUE") {
x <- input$t_tab_1_rows_selected
deleteTransaction(x)
isolate(dFt1$dat <- dFt1$dat[row.names(dFt1$dat) != x, ])
}
})
deleteTransaction <- function(x) {
qy <- "DELETE FROM Transactions where timestamp = '<t>'"
qy <- gsub("<t>",x,qy)
db <- dbConnect(SQLite(), dbname=systemDatabase)
dbGetQuery(db,qy)
dbDisconnect(db)
}
dFt1好!终于找到了一些有用的东西
observeEvent(input$deleteConfirmChoice, {
if (input$deleteConfirmChoice == "TRUE") {
x <- input$t_tab_1_rows_selected
deleteTransaction(x)
isolate(dFt1$dat <- dFt1$dat[row.names(dFt1$dat) != x, ])
shinyjs::disable("delete")
shinyjs::disable("edit")
session$sendCustomMessage(
type = 'jsCode'
,list(value = '1 != 1;')
)
}
})
observeEvent(输入$deleteConfirmChoice{
if(输入$deleteConfirmChoice==“TRUE”){
这里是另一种方法
我更改了传递给会话$sendCustomMessage的javascript代码。单击“否”按钮返回0。单击“是”按钮返回一个随机数。我希望这将保证在连续两次单击“是”按钮时获得不同的值
observe({
if (is.null(input$delete) || input$delete == 0){return()}
session$sendCustomMessage(
type = 'jsCode'
,list(value =
'
(function() {
if (confirm("Are you sure?")) {
return Math.random()*3 + 1;
} else {
return 0;
}
})()
'
)
)
})
observeEvent(input$deleteConfirmChoice, {
if (input$deleteConfirmChoice == "TRUE") {
x <- input$t_tab_1_rows_selected
deleteTransaction(x)
isolate(dFt1$dat <- dFt1$dat[row.names(dFt1$dat) != x, ])
}
})
观察({
如果(is.null(输入$delete)|输入$delete==0){return()}
会话$sendCustomMessage(
类型='jsCode'
,列表(值=
'
(功能(){
如果(确认(“你确定吗?”){
返回Math.random()*3+1;
}否则{
返回0;
}
})()
'
)
)
})
observeEvent(输入$deleteConfirmChoice{
if(输入$deleteConfirmChoice==“TRUE”){
x我想我有一些线索。在第一次尝试中,我单击了OK按钮,将input$deleteConfirmChoice设置为TRUE。当我第二次这样做时,它的值仍然为TRUE,因此值没有变化。因此,代码无法执行。如何修复此问题?嗨,我是shinyjs的作者,我只想指出,如果您使用的是shinyjs,您不应该使用会话$sendCustomMessage
——您应该查看shinyjs::extendShinyjs
,以简化调用javascript函数的过程