我能够使用renderUI动态生成不同的选择。现在,我希望使用选定的输入并在主面板上动态更改输出
selectInput包含不同数据库的列表。默认情况下,我使用最新的数据库,但我想为用户提供使用以前的数据库的选项。这些先前的数据库显示在selectInput下拉菜单中。如前所述,我可以显示所有不同的数据库,但是我不能选择一个数据库,也不能根据所选的选择更改mainPanel输出。
这是我的ui.R
shinyUI(fluidPage(
# Application title
titlePanel("Fill Traffic Analysis"),
# Sidebar with a slider input for number of bins
sidebarLayout(
sidebarPanel(
sliderInput("mkts",
"Percent of outside Fill traffic",
min = 0,
max = 100,
value = 60),
helpText("The following list will be generated dynamically"),
uiOutput("vx"),
#downloadButton("downloadData", "Download"),
width=2
),
# Show a plot of the generated distribution
mainPanel(
h1("Database"),
h2(textOutput("database")),
plotOutput("egressMkts.FillTraffic", width = "125%", height = 720)
)
)
)
)
这是我的服务器。R
shinyServer(
function(input, output) {
tryCatch({
#Let's set the working directory to /data which is where the database files are stored
setwd("/data")
#Find the first 10 files with the string "router" in it
files <- system("ls -lt | grep \"router\" | head", intern=TRUE)
pos=regexpr('router2router', files[1])
database <- substr(files[1],pos,nchar(files[1]))
output$database <- renderText(database)
output$vx <- renderUI({
selectInput("databaseList","Select a database",choices=substr(files,pos,nchar(files)))
})
#database <- get(input$databaseList)
#Connect to the SQL database
db<-dbConnect(SQLite(),dbname=database)
dbListTables(db)
dbListFields(db,"netflow_table")
#Query the database
query <- "select ingressGW, ingressCDN, ingressOnNet, egressGW, egressCDN, ipbusBytes from netflow_table where ingressCDN NOT LIKE
\"%notCDN%\" and egressCDN NOT LIKE \"%notCDN%\" "
raw.traffic.data <- dbGetQuery(db,query)
.
.
.
.
.
output$egressMkts.FillTraffic <- renderPlot({
#database <- get(input$databaseList)
.
.
.
.
.
.
})
},
error=function(e){
cat(paste("in err handler\n"),e)
},
warning=function(w){
cat(paste("in warn handler2\n"),w)
}
)
}
)
答案 0 :(得分:0)
尝试使用switch
:
selcted_database = reactive(switch(input$databaseList,
"DB1" = name_database_1,
"DB2" = name_database_2,
...))
M