在闪亮的应用程序中使用操作按钮移动到数据帧的下一行
Use actionbutton to move to the next row of dataframe in a shiny app
我有下面的 shiny
应用程序,当用户点击数据表的一行时,另一个数据框中会出现一个子集 df
并显示一个文本。
我想在按下 Next
actionbutton()
文本时显示子集数据帧的下一行数据。在这种情况下,它应该显示 "flower b has score 5"
.
我的原始数据会有很多行,所以每次按 Next
时,我需要根据对应的行调整文本。
shinyApp(
ui = fluidPage(DT::dataTableOutput('tableId'),
textOutput("celltext"),
actionButton("next","Next")),
server = function(input, output) {
output$tableId = DT::renderDataTable(
iris[,c(1,5)], selection = list(target = 'row',mode="single")
)
species<-c("setosa","setosa","virginica","virginica")
flower<-c("a","b","c","d")
score<-c(7,5,6,9)
df<-data.frame(species,flower,score)
observeEvent(input$tableId_rows_selected, {
output$celltext <- renderText({
cell <- input$tableId_rows_selected
dat<-df[df$species %in% iris[cell,5],]
df <-dat[order(dat$score,decreasing = T),]
df
paste("flower",df[1,2],"has score",df[1,3])
})
})
}
)
定义 reactiveValues
对象会有帮助。也许你正在寻找这个
shinyApp(
ui <- fluidPage(DT::dataTableOutput('tableId'),
textOutput("celltext"),
actionButton("next","Next")),
server <- function(input, output) {
rv <- reactiveValues(text=NULL)
dt <- reactiveValues(data=NULL)
rnum <- reactiveVal(0)
output$tableId = DT::renderDataTable(
iris[,c(1,5)], selection = list(target = 'row',mode="single")
)
species<-c("setosa","setosa","virginica","virginica","setosa","setosa","virginica","virginica")
flower<-c("a","b","c","d","e","f","g","h")
score<-c(7,5,6,9,1,2,3,4)
df<-data.frame(species,flower,score)
observeEvent(input$tableId_rows_selected, {
row <- input$tableId_rows_selected
dat<-df[df$species %in% iris[row,5],]
dt$data <-dat[order(dat$score,decreasing = T),]
rv$text <- paste("flower",dt$data[1,2],"has score",dt$data[1,3])
rnum(1)
output$celltext <- renderText({
rv$text
})
})
observeEvent(input[['next']], {
rnum(rnum()+1)
rv$text <- paste("flower",dt$data[rnum(),2],"has score",dt$data[rnum(),3])
})
}
)
我有下面的 shiny
应用程序,当用户点击数据表的一行时,另一个数据框中会出现一个子集 df
并显示一个文本。
我想在按下 Next
actionbutton()
文本时显示子集数据帧的下一行数据。在这种情况下,它应该显示 "flower b has score 5"
.
我的原始数据会有很多行,所以每次按 Next
时,我需要根据对应的行调整文本。
shinyApp(
ui = fluidPage(DT::dataTableOutput('tableId'),
textOutput("celltext"),
actionButton("next","Next")),
server = function(input, output) {
output$tableId = DT::renderDataTable(
iris[,c(1,5)], selection = list(target = 'row',mode="single")
)
species<-c("setosa","setosa","virginica","virginica")
flower<-c("a","b","c","d")
score<-c(7,5,6,9)
df<-data.frame(species,flower,score)
observeEvent(input$tableId_rows_selected, {
output$celltext <- renderText({
cell <- input$tableId_rows_selected
dat<-df[df$species %in% iris[cell,5],]
df <-dat[order(dat$score,decreasing = T),]
df
paste("flower",df[1,2],"has score",df[1,3])
})
})
}
)
定义 reactiveValues
对象会有帮助。也许你正在寻找这个
shinyApp(
ui <- fluidPage(DT::dataTableOutput('tableId'),
textOutput("celltext"),
actionButton("next","Next")),
server <- function(input, output) {
rv <- reactiveValues(text=NULL)
dt <- reactiveValues(data=NULL)
rnum <- reactiveVal(0)
output$tableId = DT::renderDataTable(
iris[,c(1,5)], selection = list(target = 'row',mode="single")
)
species<-c("setosa","setosa","virginica","virginica","setosa","setosa","virginica","virginica")
flower<-c("a","b","c","d","e","f","g","h")
score<-c(7,5,6,9,1,2,3,4)
df<-data.frame(species,flower,score)
observeEvent(input$tableId_rows_selected, {
row <- input$tableId_rows_selected
dat<-df[df$species %in% iris[row,5],]
dt$data <-dat[order(dat$score,decreasing = T),]
rv$text <- paste("flower",dt$data[1,2],"has score",dt$data[1,3])
rnum(1)
output$celltext <- renderText({
rv$text
})
})
observeEvent(input[['next']], {
rnum(rnum()+1)
rv$text <- paste("flower",dt$data[rnum(),2],"has score",dt$data[rnum(),3])
})
}
)