rshinyshinydashboard
How to ensure that in pickerInput choices at least one item is selected in each group
I have not been able to find an answer to this issue on SO. The code below
library(shiny)
library(shinydashboard)
library(shinyWidgets)
library(shinyjs)
library(magrittr)
library(dplyr)
ui <- dashboardPage(
dashboardHeader(title = "PickerInput Query", titleWidth=450),
dashboardSidebar( width = 300,
useShinyjs(),
sidebarMenu(id = "tabs")
),
dashboardBody(
tags$head(
tags$style(HTML("
.col-sm-10 {
width: 45% !important;
}
.col-sm-2 {
width: 55% !important;
}
"))),
uiOutput('groupvar'),
uiOutput('shapetype')
))
server <- function(input, output, session) {
sx <- c("M","F")
#arm <- c(rep("DrugA",2),rep("DrugB",2),rep("Placebo_NotDrug",1))
arm <- c(rep("Drug A",2),rep("Drug B",2),rep("Placebo NotDrug",1))
d <- data.frame(
subjectID = c(1:100),
sex = c(rep("F",9),rep(sx,43),rep("M",5)),
treatment = c(rep(arm,20)),
race = c(rep("W",76),rep("B",15),rep("O",5),rep("H",1),rep("A",3)),
baseline_result = c(rnorm(50, 4, 3), rnorm(50, 3, 3)),
postbase_result = c(rnorm(50, 5, 3), rnorm(50, 4, 2)),
stringsAsFactors = FALSE)
dat <- reactive(d)
myfun <- function(df, var1) {
df %>% mutate(newvar = !!sym(var1)) # create newvar
}
output$groupvar<-renderUI({
bc<-colnames(dat()[sapply(dat(),class)=="character"])
tagList(
pickerInput(inputId = 'group.var',
label = 'Select group by variable. Then select order, color and shape',
choices = c("NONE",bc[1:length(bc)]), selected="NONE",
width = "350px",
options = list(`style` = "btn-warning"))
)
})
### pick order, color and shape
observeEvent(input$group.var, {
output$shapetype<-renderUI({
req(input$group.var,dat())
if(is.null(input$group.var)){
return(NULL)
}else if(sum(input$group.var=="NONE")==1){
return(NULL)
}else{
mydf <- subset(dat(), dat()[input$group.var] != "")
mydf2 <- myfun(mydf,input$group.var) ## create a new variable named newvar
mygrp <- as.character(unique(mydf2$newvar))
ngrp <- length(mygrp)
myorder <- (1:ngrp)
mycolor <- c("red", "blue", "green", "brown", "orange", "maroon")
myshape <- c("circle", "triangle", "plus", "cross", "diamond", "downtriangle")
lapply(1:ngrp, function(i){
pickerInput(paste0("line.vars.",i),
label = paste0(mygrp[i], ":" ),
choices = list(DisplayOrder = myorder,
ShapeColor = mycolor,
ShapeType = myshape,
Group = mygrp), ## how do we hide or disable this 4th item
selected = list( i, mycolor[i], myshape[i], mygrp[i] ),
multiple = T,
inline = TRUE,
width = "275px" , #mywidth,
options = list('max-options-group' = 1,
`style` = "btn-primary"))
})
}
})
}, ignoreInit = TRUE)
}
shinyApp(ui, server)
gives the following output:
It gives the option for the user to pick the order, color and shape for each of the available group value in their data. However, when users accidentally click on their selected choice again, it deselects that choice. In the image above, I have deselected order, color and shape for Drug A. It should not allow a user to deselect any group. My expectation is that if color has a choice of red and blue, they should be able to pick either color but not none.
@Stephane Laurent's answer works for the first element. I am still able to deselect order, color and shape from the second element onwards in the treatment example above. Please see the output below:
output2
Solution
Try this. The JavaScript code prevents to deselect an option if it is the unique selected option.
js <- "
$(document).ready(function(){
$('#somevalue').on('show.bs.select', function(){
$('a[role=option]').on('click', function(e){
var selections = $('#somevalue').val();
if(selections.length === 1 && $(this).hasClass('selected')){
e.stopImmediatePropagation();
};
});
}).on('hide.bs.select', function(){
$('a[role=option]').off('click');
});
});"
ui <- fluidPage(
tags$head(tags$script(HTML(js))),
pickerInput(
inputId = "somevalue",
label = "A label",
choices = c("a", "b"),
multiple = TRUE
),
verbatimTextOutput("value")
)
server <- function(input, output) {
output$value <- renderPrint(input$somevalue)
}
shinyApp(ui, server)
EDIT
I see that you are using pickerInput with groups of options. Here is the JS code for this situation:
js <- "
$(document).ready(function(){
$('#groups').on('show.bs.select', function(){
$('a[role=option]').on('click', function(e){
var classes = $(this).parent().attr('class').split(/\\s+/);
if(classes.length === 2){
var group = classes[0];
var selections = $('.' + group + '.selected');
if(selections.length === 1){
e.stopImmediatePropagation();
}
}
});
}).on('hide.bs.select', function(){
$('a[role=option]').off('click');
});
});"
ui <- fluidPage(
tags$head(tags$script(HTML(js))),
pickerInput(
inputId = "groups",
label = "Select one from each group below:",
choices = list(
Group1 = c("1", "2", "3", "4"),
Group2 = c("A", "B", "C", "D")
),
multiple = TRUE
),
verbatimTextOutput(outputId = "res_grp")
)
server <- function(input, output) {
output$res_grp <- renderPrint(input$groups)
}
shinyApp(ui, server)
EDIT
For your case:
library(shiny)
library(shinydashboard)
library(shinyWidgets)
library(dplyr)
js <- "
$(document).ready(function(){
$('#shapetype').on('show.bs.select', 'select[id^=linevars]', function(){
$('a[role=option]').on('click', function(e){
var classes = $(this).parent().attr('class').split(/\\s+/);
if(classes.length === 2){
var group = classes[0];
var selections = $('.' + group + '.selected');
if(selections.length === 1){
e.stopImmediatePropagation();
}
}
});
}).on('hide.bs.select', function(){
$('a[role=option]').off('click');
});
});"
ui <- dashboardPage(
dashboardHeader(title = "PickerInput Query", titleWidth=450),
dashboardSidebar( width = 300,
sidebarMenu(id = "tabs")
),
dashboardBody(
tags$head(
tags$style(HTML("
.col-sm-10 {
width: 45% !important;
}
.col-sm-2 {
width: 55% !important;
}
")),
tags$script(HTML(js))
),
uiOutput('groupvar'),
uiOutput('shapetype')
))
server <- function(input, output, session) {
sx <- c("M","F")
#arm <- c(rep("DrugA",2),rep("DrugB",2),rep("Placebo_NotDrug",1))
arm <- c(rep("Drug A",2),rep("Drug B",2),rep("Placebo NotDrug",1))
d <- data.frame(
subjectID = c(1:100),
sex = c(rep("F",9),rep(sx,43),rep("M",5)),
treatment = c(rep(arm,20)),
race = c(rep("W",76),rep("B",15),rep("O",5),rep("H",1),rep("A",3)),
baseline_result = c(rnorm(50, 4, 3), rnorm(50, 3, 3)),
postbase_result = c(rnorm(50, 5, 3), rnorm(50, 4, 2)),
stringsAsFactors = FALSE)
dat <- reactive(d)
myfun <- function(df, var1) {
df %>% mutate(newvar = !!sym(var1)) # create newvar
}
output$groupvar<-renderUI({
bc<-colnames(dat()[sapply(dat(),class)=="character"])
tagList(
pickerInput(inputId = 'group.var',
label = 'Select group by variable. Then select order, color and shape',
choices = c("NONE",bc[1:length(bc)]), selected="NONE",
width = "350px",
options = list(`style` = "btn-warning"))
)
})
### pick order, color and shape
observeEvent(input$group.var, {
output$shapetype<-renderUI({
req(input$group.var,dat())
if(is.null(input$group.var)){
return(NULL)
}else if(sum(input$group.var=="NONE")==1){
return(NULL)
}else{
mydf <- subset(dat(), dat()[input$group.var] != "")
mydf2 <- myfun(mydf,input$group.var) ## create a new variable named newvar
mygrp <- as.character(unique(mydf2$newvar))
ngrp <- length(mygrp)
myorder <- (1:ngrp)
mycolor <- c("red", "blue", "green", "brown", "orange", "maroon")
myshape <- c("circle", "triangle", "plus", "cross", "diamond", "downtriangle")
lapply(1:ngrp, function(i){
pickerInput(paste0("linevars",i),
label = paste0(mygrp[i], ":" ),
choices = list(DisplayOrder = myorder,
ShapeColor = mycolor,
ShapeType = myshape,
Group = mygrp), ## how do we hide or disable this 4th item
selected = list( i, mycolor[i], myshape[i], mygrp[i] ),
multiple = T,
inline = TRUE,
width = "275px" , #mywidth,
options = list('max-options-group' = 1,
`style` = "btn-primary"))
})
}
})
}, ignoreInit = TRUE)
}
shinyApp(ui, server)
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