[英]How to trigger observeEvent and action with different input types in R Shiny?
What I have我拥有的
I made a Shiny app that shows a plot with some points.我制作了一个 Shiny 应用程序,它显示了一些点的情节。
You can manually change the y axis.您可以手动更改 y 轴。 There is a button that allows to automatically adjust the y axis so it fits the data.
有一个按钮可以自动调整 y 轴,使其适合数据。 There is a drop-down box that allows you to select data.
有一个下拉框可让您选择数据。
I have this code:我有这个代码:
library(shiny)
# user interface ----------------------------------------------------------
ui <- fluidPage(
fluidRow(plotOutput("myplot")),
tabsetPanel(
tabPanel(
"Input",
fluidRow(
column(
2,
numericInput(inputId = "ymax", label = "y-axis maximum", value = 30),
numericInput(inputId = "ymin", label = "y-axis minimum", value = 9),
actionButton("fity", label = "zoom to fit")
),
column(
2,
selectInput(inputId = "yaxis", label = "y-axis",
choices = list("1 to 5" = 1,
"3 to 7" = 2)
),
checkboxInput("mybx", label = "checkbox", value = TRUE)
)
)
),
fluidRow()
)
)
# server function ---------------------------------------------------------
server <- function(input, output, session) {
ydata <- reactive({
switch(input$yaxis,
"1" = {
updateCheckboxInput(session, "mybx", value = TRUE)
1:5},
"2" = {
updateCheckboxInput(session, "mybx", value = FALSE)
3:7}
)
})
observeEvent(input$fity, {
newymax <- trunc(max(ydata())) + 1
newymin <- trunc(min(ydata()))
updateNumericInput(session, "ymax", value = newymax)
updateNumericInput(session, "ymin", value = newymin)}
)
output$myplot <- renderPlot({
par(mar = c(4, 4, 0.1, 0.1))
plot(x = 1:5, y = ydata(), ylim = c(input$ymin, input$ymax))
})
}
shinyApp(ui = ui, server = server)
What I want to do我想做的事
I want that the fit-y-axis code triggered by the action button will also be triggered when I'm changing the data with the dropdown box.我希望当我使用下拉框更改数据时,也将触发由操作按钮触发的适合 y 轴代码。
Things I've tried:我尝试过的事情:
selectInput
together with the button.selectInput
与按钮一起使用。ydata <- reactive
and observeEvent
.ydata <- reactive
observeEvent
和observeEvent
调用该函数。 Did not work. Any help would be appreciated.任何帮助,将不胜感激。
Why not just have another observeEvent
that monitors the change in the yaxis
input?为什么不只是有另一个
observeEvent
监控的变化yaxis
输入?
library(shiny)
# user interface ----------------------------------------------------------
ui <- fluidPage(
fluidRow(plotOutput("myplot")),
tabsetPanel(
tabPanel(
"Input",
fluidRow(
column(
2,
numericInput(inputId = "ymax", label = "y-axis maximum", value = 30),
numericInput(inputId = "ymin", label = "y-axis minimum", value = 9),
actionButton("fity", label = "zoom to fit")
),
column(
2,
selectInput(inputId = "yaxis", label = "y-axis",
choices = list("1 to 5" = 1,
"3 to 7" = 2)
),
checkboxInput("mybx", label = "checkbox", value = TRUE)
)
)
),
fluidRow()
)
)
server <- function(input, output, session) {
ydata <- reactive({
switch(input$yaxis,
"1" = {
updateCheckboxInput(session, "mybx", value = TRUE)
1:5},
"2" = {
updateCheckboxInput(session, "mybx", value = FALSE)
3:7}
)
})
observeEvent(input$fity, {
newymax <- trunc(max(ydata())) + 1
newymin <- trunc(min(ydata()))
updateNumericInput(session, "ymax", value = newymax)
updateNumericInput(session, "ymin", value = newymin)}
)
observeEvent(input$yaxis, {
newymax <- trunc(max(ydata())) + 1
newymin <- trunc(min(ydata()))
updateNumericInput(session, "ymax", value = newymax)
updateNumericInput(session, "ymin", value = newymin)}
)
output$myplot <- renderPlot({
par(mar = c(4, 4, 0.1, 0.1))
plot(x = 1:5, y = ydata(), ylim = c(input$ymin, input$ymax))
})
}
shinyApp(ui = ui, server = server)
But this makes your 'zoom to fit' button redundant.但这会使您的“缩放以适合”按钮变得多余。
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