I have a selectizeInput (with parameter multiple = FALSE) in a shiny app. I´m not able to change the multiple-parameter afterwards by using the server-side updateSelectizeInput() and setting the option there.
Here is an example:
library(shiny)
ui <- fluidPage(
selectizeInput(
inputId = "name",
label = "Select Name:",
choices = NULL
)
)
server <- function(input, output, session) {
updateSelectizeInput(
inputId = "name",
choices = c("Markus", "Lisa", "Peter"),
options = list(maxItems = 10),
server = TRUE # set consciously, I have a big list to handle
)
}
shinyApp(ui, server)
If I don´t set the server parameter to TRUE, everything works just fine. Is this a bug or do I miss something?
To select multiple items, you can set multiple=TRUE in the selectizeInput as shown below.
library(shiny)
ui <- fluidPage(
selectizeInput(
inputId = "name",
label = "Select Name:",
choices = NULL, multiple=T
)
)
server <- function(input, output, session) {
updateSelectizeInput(
inputId = "name",
choices = c("Markus", "Lisa", "Peter"),
options = list(maxItems = 10),
server = TRUE # set consciously, I have a big list to handle
)
}
shinyApp(ui, server)
Related
I am trying to change the color of the slide when updating its values. I have tried different ways without success. The following code does not run, but replicates what I am trying to do:
if (interactive()) {
library("shiny")
library("shinyWidgets")
ui <- fluidPage(
br(),
sliderTextInput(
inputId = "mySlider",
label = "Pick a month :",
choices = month.abb,
selected = "Jan"
),
verbatimTextOutput(outputId = "res"),
radioButtons(
inputId = "up",
label = "Update choices:",
choices = c("Abbreviations", "Full names")
)
)
server <- function(input, output, session) {
output$res <- renderPrint(str(input$mySlider))
observeEvent(input$up, {
choices <- switch(
input$up,
"Abbreviations" = month.abb,
"Full names" = month.name
)
updateSliderTextInput(
session = session,
inputId = "mySlider",
choices = choices,
color = "red" # This is the line I need to add
)
}, ignoreInit = TRUE)
}
shinyApp(ui = ui, server = server)
}
Maybe has someone the answer to this?
I was able to give this some more thought and figured out a way to update the slider color based on an input. shinyWidgets::setSliderColor essentially just injects CSS to overwrite all the classes associated with the sliderInputs. So it needs to be included in the UI instead of the server. (Took a min to realize that).
I set up a blank uiOutput which is then updated by observing input$up with the new or default color.
Demo
ui <- fluidPage(
br(),
mainPanel(class = "temp",
uiOutput('s_color'), # uiOuput
sliderTextInput(
inputId = "mySlider",
label = "Pick a month :",
choices = month.abb,
selected = "Jan"
),
verbatimTextOutput(outputId = "res"),
radioButtons(
inputId = "up",
label = "Update choices:",
choices = c("Abbreviations", "Full names")
)
)
)
server <- function(input, output, session) {
output$res <- renderPrint(str(input$mySlider))
# output$s_color = renderUI({})
observeEvent(input$up, {
choices <- switch(
input$up,
"Abbreviations" = month.abb,
"Full names" = month.name
)
updateSliderTextInput(
session = session,
inputId = "mySlider",
choices = choices
)
output$s_color = renderUI({ # add color
if (input$up == "Full names") {
setSliderColor(c("Red"), c(1))
} else {
setSliderColor(c("#428bca"), c(1))
}
})
}, ignoreInit = TRUE)
}
shinyApp(ui = ui, server = server)
BACKGROUND:
I have a large list of stock symbols, 27,000 rows, that I would like to be choices in a selectizeInput() on a shinyApp. Since the list is large I am using server = T in updateSelectizeInput().
AIM:
I would like the options list to not load/render until a user starts typing a string into selectizeInput(), so that I can return all symbols that start with that letter, to reduce loading all 27,000 rows in the input. I would like input$ticker to be what is observed and then what triggers the filtering code logic. How can i achieve this without using a specific button?
Shown below is
intended output, but with a button to produce the behavior instead of the user being in the text box. This is along the lines of what I would like, but does not automatically start searchign when I type in the box and has bad code smell to me.
current logic, using input$ticker in an observer to trigger selection of df and populate updateSelectize() with new choices, but is failing and the app is evaluating too soon?\
trying to load choices once, using upload button only doesn't work
REPREX:
1.
library(shiny)
tickers <- rep(rownames(mtcars), 850)
ui <- {
renderUI(
shiny::fluidRow(
bs4Dash::box(
title = shiny::selectizeInput(
inputId = "ticker",
label = "Ticker:",
choices = NULL,
selected = "AAPL",
options = list(
placeholder = "e.g AAPL",
create = TRUE,
maxOptions = 50L
)
),
actionButton(
inputId = "update",
label = "UPDATE NOW"
),
id = "tickerBox",
closable = F,
maximizable = F,
width = 12,
height = "250px",
solidHeader = FALSE,
collapsible = F
)
)
)
}
server <- function(input, output, session){
choice <- reactive(
tickers[startsWith(tickers$symbol, input$ticker), ]
)
observeEvent(input$update, {
updateSelectizeInput(
session = session,
label = "Ticker:",
inputId ="ticker",
choices = choice(),
server = TRUE
)
})
}
shiny::shinyApp(ui = ui, server = server)
# REPREX for selectize, glitches and `input$ticker` observer causes loop gltich?
library(shiny)
tickers <- rep(rownames(mtcars), 850)
ui <- {
renderUI(
shiny::fluidRow(
bs4Dash::box(
title = shiny::selectizeInput(
inputId = "ticker",
label = "Ticker:",
choices = NULL,
selected = "AAPL",
options = list(
placeholder = "e.g AAPL",
create = TRUE,
maxOptions = 50L
)
),
actionButton(
inputId = "update",
label = "UPDATE NOW"
),
id = "tickerBox",
closable = F,
maximizable = F,
width = 12,
height = "250px",
solidHeader = FALSE,
collapsible = F
)
)
)
}
server <- function(input, output, session){
# updateSelectizeInput(
# session = session,
# label = "Ticker:",
# inputId ="ticker",
# choices = tickers,
# server = TRUE
# )
observeEvent(input$ticker, {
choices <- tickers[startsWith(tickers$symbol, input$ticker), ]
updateSelectizeInput(
session = session,
label = "Ticker:",
inputId ="ticker",
choices = choices,
server = TRUE
)
})
}
shiny::shinyApp(ui = ui, server = server)
# REPREX for selectize
library(shiny)
tickers <- rep(rownames(mtcars), 850)
ui <- {
renderUI(
shiny::fluidRow(
bs4Dash::box(
title = shiny::selectizeInput(
inputId = "ticker",
label = "Ticker:",
choices = NULL,
selected = "AAPL",
options = list(
placeholder = "e.g AAPL",
create = TRUE,
maxOptions = 50L
)
),
actionButton(
inputId = "update",
label = "UPDATE NOW"
),
id = "tickerBox",
closable = F,
maximizable = F,
width = 12,
height = "250px",
solidHeader = FALSE,
collapsible = F
)
)
)
}
server <- function(input, output, session){
# One call to try and load ticker df
observeEvent(input$update, {
updateSelectizeInput(
session = session,
label = "Ticker:",
inputId ="ticker",
choices = ticker,
server = TRUE
)
})
}
shiny::shinyApp(ui = ui, server = server)
SEE SIMILAR POSTS:
SO POST 1, SO POST 2, SO POST 3
What do you think about something like this?
library(shiny)
tickers <- rep(rownames(mtcars), 850)
ui <- fluidPage(
tags$head(
tags$script(
HTML(
'document.addEventListener("keydown", function(e) {
Shiny.setInputValue("key_pressed", e.key);
})'
)
)
),
fluidRow(
column(2, selectizeInput("select", "Select", choices = "")),
column(1, actionButton("btn", "Search"))
)
)
server <- function(input, output, session) {
observeEvent(input$btn, {
req(input$key_pressed)
updateSelectizeInput(session, "select", choices = tickers[startsWith(tickers, input$key_pressed)], server = TRUE)
})
}
shinyApp(ui, server)
Basically I think it is not possible to just use the words which are putted to the selectInput and we need separate input. I think that selectInput is truthy (isTruthy()) only after some option was chosen (and it can't be "" of course), so we can't use anything which is putted as a word to the selectInput box before some option is actually chosen. I'm not sure, but if I'm right, it is necessary to have separate input for what you want.
However, if we could assume that:
User will use only one letter to get the options to choose
Then we can use "keydown" event (keydown). Now the user doesn't need to put anything to the selectInput box, she/he can just use a key in the keyboards, like C (letter size does matter here, because we are using startsWith()) and then push "Search" button (but of course this letter can still be put to the selectInput box to mimic what you tried to achieve). We could even imagine solution without the button, but I'm afraid in most use-cases it will be not recommended, I mean if user can interact with the app using keyboard not only to choose the options, but also for other purposes, then we would recompute new options everytime user uses key in the keyboard for - well - nothing.
Turns out that selectizeInput doesn't accept a df and must be an atomic vector. When I used tickers[[1]], the issue seemed to be solved, and the list would no longer flash.
When I use options = list(create = TRUE) in selectizeInput, I can manually add a value - see also https://selectize.dev/docs.html and example 3 in https://shiny.rstudio.com/gallery/selectize-examples.html.
How do I add a new value from server code? The example below use a hypothetical updateSelectizeInput and expectedly does not work.
library(shiny)
ui = fluidPage(
selectizeInput("select", 'Select',
choices = c("anton", "bertha"),
options = list(create = TRUE)
),
actionButton("settext", "Set Text from server")
)
server = function(input, output, session) {
# This code does not work, shows the idea
updateSelectizeInput(session, "select", options = list(value = "Caesar"))
}
shinyApp(ui, function(input, output, session) {})
Is this what you want to achieve?
library(shiny)
choices <- c("anton", "bertha")
ui = fluidPage(
selectizeInput("select", 'Select',
choices = choices,
options = list(create = TRUE)
),
actionButton("settext", "Set Text from server")
)
server = function(input, output, session) {
# Your update is appending Caesar to the choices
updateSelectizeInput(session, "select", choices = c(choices, "Caesar"))
}
shinyApp(ui,server)
library(shiny)
ui = fluidPage(
selectizeInput("select", 'Select or edit manually',
choices = c("anton", "bertha"),
options = list(create = TRUE)
),
verbatimTextOutput("showtext", placeholder = TRUE),
actionButton("goButton", "Get Text from server")
)
server = function(input, output, session) {
output$showtext = renderPrint({
input$goButton
isolate(input$select)
})
}
shinyApp(ui, server)
I want to update the choices-argument from a radioButtons-widget in R/shiny. When a user selected a choice, the choices argument should be updated based on the first choice of the user. I mocked this with 4 random letters with the sample-function. It appears that the update does not stop and is updated several times. How do I prevent the behavior of updating multiple times?
Here is code to reproduce my approach:
library("shiny")
ui <- fluidPage(
radioButtons("answerchoice", label = "item", choices = sample(letters, 4), selected = NULL,
)
)
server <- function(input, output, session) {
observeEvent(input$answerchoice,{
updateRadioButtons(
session = session,
inputId = "answerchoice",
choices = sample(letters, 4)
)
})
}
shinyApp(ui = ui, server = server)
Seems like the default setting of selected = NULL might be the problem. radioButton is picking one value initally. This may cause the multiple updates. By setting selected to nothing. The app is not updating uncontrollably.
library("shiny")
ui <- fluidPage(
radioButtons("answerchoice",
label = "item",
choices = sample(letters, 4),
selected = character(0)
)
)
server <- function(input, output, session) {
observeEvent(input$answerchoice,{
updateRadioButtons(
session = session,
inputId = "answerchoice",
choices = sample(letters, 4),
selected = character(0)
)
})
}
shinyApp(ui = ui, server = server)
I want to change the checkboxinput value to FALSE/TRUE during run-time. How can I do this?
checkboxInput(inputId = "smoother", label = "Overlay smooth trend line", value = FALSE)
You can use updateCheckboxInput(). See an example below:
Reproducible example:
library(shiny)
ui <- fluidPage(
actionButton(
inputId = "check",
label = "update checkbox"
),
checkboxInput(
inputId = "checkbox",
label = "Input checkbox"
)
)
server <- function(input, output, session) {
observeEvent(
eventExpr = input$check, {
updatedValue = !input$checkbox
updateCheckboxInput(
session = session,
inputId = "checkbox",
value = updatedValue
)
}
)
}
shinyApp(ui, server)