我正在制作一款应用程序,需要添加一个刷新页面的按钮(与按下F5键具有相同功能)。是否有人可以分享一段代码来实现它?
非常感谢!
我有一个非常简单而且好用的解决方案,但它不适用于文件输入。
这里有一个对于所有输入都有效,但不包括文件输入的解决方案:
更新2017年:在前两年中,这个解决方案对于文件输入无效,但现在它已经可行了。
library(shiny)
library(shinyjs)
runApp(shinyApp(
ui = fluidPage(
shinyjs::useShinyjs(),
div(
id = "form",
textInput("text", "Text", ""),
selectInput("select", "Select", 1:5),
actionButton("refresh", "Refresh")
)
),
server = function(input, output, session) {
observeEvent(input$refresh, {
shinyjs::reset("form")
})
}
))
当您按下“刷新”按钮时,所有输入将被重置为它们的初始值。这是评论中海报实际想做的事情。
但是文件输入非常奇怪,很难“重置”它们。在这里查看。如果您愿意,可以尝试使用一些JavaScript来几乎重置输入字段。
但是,为了完整起见,您也可以刷新整个页面。最简单的方法是使用session$reload()
。您还可以使用{shinyjs}来完成:
library(shiny)
library(shinyjs)
runApp(shinyApp(
ui = fluidPage(
shinyjs::useShinyjs(),
shinyjs::extendShinyjs(text = "shinyjs.refresh_page = function() { location.reload(); }", functions = "refresh_page"),
textInput("text", "Text", ""),
actionButton("refresh", "Refresh")
),
server = function(input, output, session) {
observeEvent(input$refresh, {
shinyjs::js$refresh_page()
})
}
))
免责声明:这两种解决方案都使用了我编写的软件包shinyjs
tags$a(href = "http://www.google.com", "点击我")
- DeanAttali
selectInput("domain", label = h4("Domain:"), choices = Domain, selected = CurrentDomain)
conn<-odbcDriverConnect(connString)
SystemInfo<-sqlQuery(conn, 'SELECT * FROM [DQ].[DQSystemInfo]', stringsAsFactors = FALSE)
close(conn)
Domain<-unique(SystemInfo$Domain)
Domain<-c(Domain,'NEW')
SubDomain<-unique(SystemInfo$SubDomain[SystemInfo$Domain==Domain[1]])
SubDomain<-c(SubDomain,'NEW')
CurrentDomain<-Domain[1]
CurrentSubDomain<-SubDomain[1]
SystemInfo1<-SystemInfo[SystemInfo$Domain==CurrentDomain & SystemInfo$SubDomain==CurrentSubDomain,]
jsResetCode <- "shinyjs.reset = function() {history.go(0)}"
shinyApp(
ui = fluidPage(
shinyjs::useShinyjs(),
shinyjs::extendShinyjs(text = "shinyjs.refresh = function() { location.reload(); }"),
# div(
# id = "form",
fluidRow(
column(6, selectInput("domain", label = h4("Domain:"),
choices = Domain, selected = CurrentDomain)),
column(6,uiOutput("Condition2"))
),
# fluidRow(column(2, verbatimTextOutput("value"))),
fluidRow(
column(6, uiOutput("Condition1")),
column(6,uiOutput("Condition3"))
),
extendShinyjs(text = jsResetCode),
fluidRow(
column(2, actionButton("submit", "Save", class="btn btn-primary btn-lg")),
column(2, actionButton("cancel", "Cancel", class="btn btn-primary btn-
lg")),
column(2, actionButton("delete", "Delete", class="btn btn-primary btn-lg"))
)
#)
),
server = function(input, output) {
observeEvent(input$domain, {
if (input$domain=='NEW') {
shinyjs::disable("domain")
shinyjs::disable("delete")
CurrentSubDomain<-'NEW'
output$Condition1 = renderUI({
textInput("domainT",label = "", value = "")
})
output$Condition3 = renderUI({
textInput("subdomainT", label = "",value = "")
})
})
} else {
CurrentDomain<-input$domain
SubDomain<-unique(SystemInfo$SubDomain[SystemInfo$Domain==input$domain])
SubDomain<-c(SubDomain,'NEW')}
output$Condition2 = renderUI({
selectInput("subdomain", label = h4("SubDomain:"),
choices = SubDomain, selected =CurrentSubDomain)
})
})
observeEvent(input$subdomain, {
if (input$subdomain=='NEW') {
shinyjs::disable("domain")
shinyjs::disable("subdomain")
shinyjs::disable("delete")
output$Condition3 = renderUI({
textInput("subdomainT", label = "", value = "")
})
} else {
CurrentSubDomain<-input$subdomain
conn<-odbcDriverConnect(connString)
SystemInfo<-sqlQuery(conn, 'SELECT * FROM [DQ].[DQSystemInfo]', stringsAsFactors = FALSE)
close(conn)
SystemInfo1<-SystemInfo[SystemInfo$Domain==input$domain & SystemInfo$SubDomain==input$subdomain,]
}
})
observeEvent(input$submit, {
conn<-odbcDriverConnect(connString)
DQ.DQSystemInfo<-SystemInfo[FALSE,c("Domain","SubDomain")]
DQ.DQSystemInfo[1,]<-c("","","","","","","",0,48)
DQ.DQSystemInfo$Domain<-ifelse(input$domain=='NEW',input$domainT,input$domain)
DQ.DQSystemInfo$SubDomain<-input$subdomainT
varType1 <- c("varchar(20)", "varchar(20)" )
names(varType1)<-colnames(DQ.DQSystemInfo)
sqlSave(conn, DQ.DQSystemInfo, append = TRUE, rownames = FALSE, varTypes = varType1)
close(conn)
# js$reset()
#shinyjs::reset("form")
# js$reset("form")
conn<-odbcDriverConnect(connString)
SystemInfo<-sqlQuery(conn, 'SELECT * FROM [DQ].[DQSystemInfo]', stringsAsFactors = FALSE)
close(conn)
Domain<-unique(SystemInfo$Domain)
Domain<-c(Domain,'NEW')
SubDomain<-unique(SystemInfo$SubDomain[SystemInfo$Domain==Domain[1]])
SubDomain<-c(SubDomain,'NEW')
CurrentDomain<-Domain[1]
CurrentSubDomain<-SubDomain[1]
SystemInfo1<-SystemInfo[SystemInfo$Domain==CurrentDomain & SystemInfo$SubDomain==CurrentSubDomain,]
shinyjs::js$refresh()
})
observeEvent(input$cancel, {
#js$reset()
#shinyjs::reset("form")
#js$reset("form")
shinyjs::js$refresh()
})
observeEvent(input$delete, {
conn<-odbcDriverConnect(connString)
delete.query <- paste0("DELETE DQ.DQSystemInfo WHERE Domain='",
input$domain,"' and SubDomain='",input$subdomain,"'")
sqlQuery(conn, delete.query)
close(conn)
#js$reset()
# shinyjs::reset("form")
# js$reset("form")
conn<-odbcDriverConnect(connString)
SystemInfo<-sqlQuery(conn, 'SELECT * FROM [DQ].[DQSystemInfo]', stringsAsFactors = FALSE)
close(conn)
Domain<-unique(SystemInfo$Domain)
Domain<-c(Domain,'NEW')
SubDomain<-unique(SystemInfo$SubDomain[SystemInfo$Domain==Domain[1]])
SubDomain<-c(SubDomain,'NEW')
CurrentDomain<-Domain[1]
CurrentSubDomain<-SubDomain[1]
SystemInfo1<-SystemInfo[SystemInfo$Domain==CurrentDomain & SystemInfo$SubDomain==CurrentSubDomain,]
shinyjs::js$refresh()
})
},options = list(height = 520))