conditionalPanel {shiny} | R Documentation

## Conditional Panel

### Description

Creates a panel that is visible or not, depending on the value of a JavaScript expression. The JS expression is evaluated once at startup and whenever Shiny detects a relevant change in input/output.

### Usage

    conditionalPanel(condition, ...)

### Arguments

`condition` | A JavaScript expression that will be evaluated repeatedly to determine whether the panel should be displayed.
`...` | Elements to include in the panel.

### Details

In the JS expression, you can refer to `input` and `output` JavaScript objects that contain the current values of input and output. For example, if you have an input with an id of `foo`, then you can use `input.foo` to read its value. (Be sure not to modify the input/output objects, as this may cause unpredictable behavior.)

### Note

You are not recommended to use special JavaScript characters such as a period `.` in the input id's, but if you do use them anyway, for example, `inputId = "foo.bar"`, you will have to use `input["foo.bar"]` instead of `input.foo.bar` to read the input value.

### Examples

    sidebarPanel(
       selectInput(
          "plotType", "Plot Type",
          c(Scatter = "scatter",
            Histogram = "hist")),

       # Only show this panel if the plot type is a histogram
       conditionalPanel(
          condition = "input.plotType == 'hist'",
          selectInput(
             "breaks", "Breaks",
             c("Sturges",
               "Scott",
               "Freedman-Diaconis",
               "[Custom]" = "custom")),

          # Only show this panel if Custom is selected
          conditionalPanel(
             condition = "input.breaks == 'custom'",
             sliderInput("breakCount", "Break Count", min=1, max=1000, value=10)
          )
       )
    )

[Package shiny version 0.14.2 Index]