R Shiny Dynamic Input
Solution 1:
See a working example below
library(shiny)
ui <- shinyUI(fluidPage(
titlePanel("Old Faithful Geyser Data"),
sidebarLayout(
sidebarPanel(
numericInput("numInputs", "How many inputs do you want", 4),
# place to hold dynamic inputs
uiOutput("inputGroup")
),
# this is just a demo to show the input values
mainPanel(textOutput("inputValues"))
)
))
# Define server logic required to draw a histogram
server <- shinyServer(function(input, output) {
# observe changes in "numInputs", and create corresponding number of inputs
observeEvent(input$numInputs, {
output$inputGroup = renderUI({
input_list <- lapply(1:input$numInputs, function(i) {
# for each dynamically generated input, give a different name
inputName <- paste("input", i, sep = "")
numericInput(inputName, inputName, 1)
})
do.call(tagList, input_list)
})
})
# this is just a demo to display all the input values
output$inputValues <- renderText({
paste(lapply(1:input$numInputs, function(i) {
inputName <- paste("input", i, sep = "")
input[[inputName]]
}))
})
})
# Run the application
shinyApp(ui = ui, server = server)