I have a small Shiny app to randomize speaker's list using insertUI (in case there is be more of them).
The problem is that I only got it working using textInput and I fail to get it done without the input box - just to display the text without the box.
It's more of an aesthetics thing but after many hours of unsuccessful trials I'm reaching out for help here.
I really appreciate your help.
Herunia
Here is the code:
if (interactive()) {
ui <- fluidPage(
actionButton("add", "Next speaker")
)
# Server logic
server <- function(input, output, session) {
a <- sample(c("Speaker 1","Speaker 2","Speaker 3","Speaker 4","Speaker 5"))
uiCount = reactiveVal(0)
observeEvent(input$add, {
uiCount(uiCount()+1)
insertUI(
selector = "#add",
where = "afterEnd",
ui = textInput(paste0("txt", input$add), paste0("Speaker #", uiCount() , ": "),
placeholder = a[uiCount()] ),
)
})
}
shinyApp(ui, server)
}
Is this closer to what you want?
ui <- fluidPage(
actionButton("add", "Next speaker"),
uiOutput("txt")
)
server <- function(input, output, session) {
a <- sample(c("Speaker 1","Speaker 2","Speaker 3","Speaker 4","Speaker 5"))
uiCount = reactiveVal(0)
observeEvent(input$add, {
uiCount(uiCount()+1)
output$txt <- renderUI({
div(
p(
paste0("Speaker #", uiCount(), " :", a[uiCount()])
) #close p
) #close div
})
})
}
shinyApp(ui, server)
Related
I have a simple shiny app which I would like to show a warning if user input is bigger than a threshold.
library(shiny)
library(shinyalert)
ui <- fluidPage(
numericInput("obs", "Observations:", 1),
verbatimTextOutput("value")
)
server <- function(input, output) {
observeEvent(input$obs,{
if(!is.na(input$obs) && input$obs >10){
shinyalert("warning!", "input too big", type = "warning")
}
})
output$value <- renderText({ input$obs })
}
shinyApp(ui, server)
if user is not quick enough to provide input, let say for the input$obs = 110 we have 1 second delay between putting the second and third value the popups warning will appear !
How should I fix this ?
Use shinyCatch from spsComps to make your life easier
library(shiny)
library(spsComps)
ui <- fluidPage(
numericInput("obs", "Observations:", 1),
verbatimTextOutput("value")
)
server <- function(input, output) {
output$value <- renderText({
shinyCatch({
if(!is.na(input$obs) && input$obs >10) warning("input too big")
}, blocking_level = "warning", prefix = "")
input$obs
})
}
shinyApp(ui, server)
when blocking_level = "warning" is specified shinyCatch blocks following code in the renderText expression. So when your number is larger than 10, the new input$obs will not be rendered.
Here's what users see
Here's what developers see in the console
You can use showNotification() from shiny itself:
library(shiny)
ui <- fluidPage(
numericInput("obs", "Observations:", 1),
verbatimTextOutput("value")
)
server <- function(input, output) {
observeEvent(input$obs,{
if(!is.na(input$obs) && input$obs >10){
showNotification(
ui = tags$h4("Input Too Big!"),
type = "warning"
)
}
})
output$value <- renderText({ input$obs })
}
shinyApp(ui, server)
Or {shinytoastr}:
library(shiny)
library(shinytoastr)
ui <- fluidPage(
shinytoastr::useToastr(),
numericInput("obs", "Observations:", 1),
verbatimTextOutput("value")
)
server <- function(input, output) {
observeEvent(input$obs,{
if(!is.na(input$obs) && input$obs >10){
shinytoastr::toastr_warning(
message = "Decrease it.",
title = "Input too big!"
)
}
})
output$value <- renderText({ input$obs })
}
shinyApp(ui, server)
Or {spsComps} as #lz100 mentioned. The choice is yours.
Tell me in R Shiny, there are two action buttons. I want to update the data according to the button I press. But for some reason it only responds to the second button and not to the first button. What is the solution?
if (interactive()) {
ui <- fluidPage(
sidebarLayout(
sidebarPanel(
actionButton("action_1", "Get 1"),
actionButton("action_2", "Get 2"),
),
mainPanel(
textOutput("result")
),
)
)
server <- function(input, output) {
data <- eventReactive(input$action_1, 1)
data <- eventReactive(input$action_2, 2)
output$result <- renderText(data())
}
shinyApp(ui, server)
}
The second line of this piece of code overwrites the first one:
data <- eventReactive(input$action_1, 1)
data <- eventReactive(input$action_2, 2)
You can do:
ui <- fluidPage(
sidebarLayout(
sidebarPanel(
actionButton("action_1", "Get 1"),
actionButton("action_2", "Get 2"),
),
mainPanel(
textOutput("result")
),
)
)
server <- function(input, output) {
result <- reactiveVal()
observeEvent(input$action_1, { result(1) })
observeEvent(input$action_2, { result(2) })
output$result <- renderText(result())
}
shinyApp(ui, server)
}
If you have many buttons you can simply add a class to it and some simple JS to monitor the last click like so:
library(shiny)
monitorJS <- "$(document).on('click', '.monitor', function () {
Shiny.onInputChange('last_click',this.id);
});"
ui <- fluidPage(
tags$head(tags$script(monitorJS)),
sidebarLayout(
sidebarPanel(
uiOutput("buttons")
),
mainPanel(
textOutput("result")
),
)
)
server <- function(input, output, session) {
output$buttons <- renderUI({
a <- list()
for(i in 1:200){
id <- paste0("action_",i)
name <- paste0("Get ",i)
a[[i]] <- actionButton(id, name, class = "monitor")
}
tagList(a)
})
data <- eventReactive(input$last_click,{
# Your click ligic here
value <- gsub("action_","",input$last_click)
value
})
output$result <- renderText({
data()
})
}
shinyApp(ui, server)
I'd like to run the action button automatically when users open/land on 'tab1'. Therefore, instead of clicking the Refresh button to view the date, I'd like to have the date printed automatically. Is there a way to do this? My real code is more complicated that this simple example. However, it demonstrates what I'd like to do. Thank you!
library(shiny)
ui <- fluidPage(
shiny::tabPanel(value = 'tab1', title = 'Data page',
br(),
shiny::actionButton("btn", "Refresh!"),
br(),
shiny::verbatimTextOutput("out")
)
)
server <- function(input, output, session) {
curr_date <- shiny::eventReactive(input$btn, {
format(Sys.Date(), "%c")
})
output$out <- shiny::renderText({
print(curr_date())
})
}
shinyApp(ui, server)
You can make curr_date reactive to the tabset:
library(shiny)
ui <- fluidPage(
tabsetPanel(
tabPanel(value = 'tab1', title = 'Data page',
br(),
actionButton("btn", "Refresh!"),
br(),
verbatimTextOutput("out")
),
tabPanel(value = 'tab2', title = 'Other tab'),
id = "tabset"
)
)
server <- function(input, output, session) {
curr_date <- eventReactive(list(input$btn, input$tabset), {
req(input$tabset == 'tab1')
format(Sys.time(), "%c")
})
output$out <- renderText({
print(curr_date())
})
}
shinyApp(ui, server)
You should use reactiveValues() and observeEvent() for this. Inside server function:
server <- function(input, output, session) {
text_out <- reactiveValues(date = format(Sys.Date(), "%c"))
observeEvent(input$btn, {
text_out$date <- "something else"
})
output$out <- renderText({
print(text_out$date)
}
I want to generate a boxPlus around my DT-Output. Now when I start my APP, the frame of the box is already there. How do I manage that the box is only displayed when the tableoutput is finished? As input I use a text input.
In my UI I use for the Input:
textInput("name", "Insert Number:")
the final box I create with:
uiOutput("box")
On Serverside I do:
output$name <- renderText(input$name)
New_input <- reactive({
list(input$name)
})
and the box I create like this:
output$box <- renderUI({
boxPlus(
div(style = 'overflow-x: scroll;'), dataTableOutput("table")
)
})
I tried it with: Similar Problem but I can not resolve the problem. Without the box everything works fine.
Never use reactive expressions inside a renderText function.
You have to wrap tagList around your two elements to return a SINGLE element (a list in your case).
Here is a reproduceable example.
library(shiny)
library(shinydashboardPlus)
library(dplyr)
# Define UI for application that draws a histogram
ui <- fluidPage(
# Application title
titlePanel("Hide box"),
# Sidebar with a slider input for number of bins
sidebarLayout(
sidebarPanel(
textInput("name", "Insert Number to filter cyl:")
),
mainPanel(
uiOutput("box")
)
)
)
server <- function(input, output) {
resultdf <- reactive({
mtcars %>%
filter(cyl > input$name)
})
output$box <- renderUI({
output$table <- renderDataTable({
resultdf()
})
if(input$name == "") {
return(NULL)
} else {
return(
tagList(
boxPlus(
div(style = 'overflow-x: scroll;'), dataTableOutput("table")
)
)
)
}
})
}
# Run the application
shinyApp(ui = ui, server = server)
I am learning R and shiny and have been trying to play around with some of the code from the shiny package documentation here. I have been trying to figure out why the conditional I have added is not responding to my condition.
What am I doing wrong as I do not get an error?
ui <- fluidPage(
uiOutput("ex")
)
server <- function(input, output) {
output$ex <- renderUI({
tagList(
selectInput("n","Please Select :",
choices = c("N","U","T")),
conditionalPanel(condition = "n"=="N",
textInput("inmean"," Mean:",0.25),
textInput("invsd","Sd", 0.02)),
conditionalPanel(condition = "n"== "U",
textInput("inmean","Mean:",0.25),
textInput("insd","Sd", 0.02))
)
})
}
shinyApp(ui, server)
Personally I wouldn't do it this way. I would use an observe({}) statement looking at the input of "n" and use updateTextInput() to change the value.
But this seems to work with the method you're using:
ui <- fluidPage(
selectInput("n","Please Select :",
choices = c("N","U","T")),
uiOutput('ex')
)
server <- function(input, output) {
output$ex <- renderUI({
if(input$n == 'N'){
tagList(
textInput("inmean"," Mean:",0.25),
textInput("invsd","Sd", 0.02)
)
}else if(input$n == 'U'){
tagList(
textInput("inmean","Mean:",0.2),
textInput("insd","Sd", 0.01)
)
}
})
}
shinyApp(ui, server)