Multiple group_by shiny app making a plot - r

Question

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I'm a really beginner in R Shiny.
I have a similar problem as at the link below.
multiple group_by in shiny app
Instead of making a table which worked out/I managed by following the instructions in the link above.
I would like to make a plot, preferably with hchart. In which i would to switch the information because of the group by. The difficult part / or the thing that doesn't work is putting the group_by on the x-axis.
## hier de tabel versie
df2 <- readRDS("Data.rds")
library(shiny)
library(DT)
library(dplyr)
ui <- fluidPage(
titlePanel("Dashboard"),
sidebarLayout(
sidebarPanel(
uiOutput("groups")
),
mainPanel(
DT::dataTableOutput("summary")
)
)
)
server <- function(input, output) {
mydata <- reactive({
data <- df2
data
})
output$groups <- renderUI({
df <- mydata()
selectInput(inputId = "grouper", label = "Group variable", choices = c("L","Lt","Lp"), selected = "L")
})
summary_data <- reactive({
req(input$grouper)
mydata() %>%
dplyr::group_by(!!!rlang::syms(input$grouper)) %>%
dplyr::summarise(aantal = n()) %>%
dplyr::arrange(desc(aantal))
})
output$summary <- DT::renderDataTable({
DT::datatable(summary_data())
})
}
shinyApp(ui, server)
The above code works, but i tried to make a plot like this:
df2 <- readRDS("Data.rds")
library(shiny)
library(highcharter)
library(dplyr)
ui <- fluidPage(
titlePanel("Dashboard"),
sidebarLayout(
sidebarPanel(
uiOutput("groups")
),
mainPanel(
highchartOutput("plotje")
)
)
)
server <- function(input, output) {
mydata <- reactive({
data <- df2
data
})
output$groups <- renderUI({
df <- mydata()
selectInput(inputId = "grouper", label = "Group variable", choices = c("L","Lt","Lp"), selected = "L")
})
summary_data <- reactive({
req(input$grouper)
mydata() %>%
dplyr::group_by(!!!rlang::syms(input$grouper)) %>%
dplyr::summarise(aantal = n()) %>%
dplyr::arrange(desc(aantal))
})
output$plotje <- renderHighchart({
data <- summary_data()
hchart(data, "column", hcaes(x = "grouper" , y = aantal)) # --> de plot zelf komt in het output deel van de UI
})
}
shinyApp(ui, server)
Could someone help me out?!
Thanks in advance!
Kind regards,
Steffie

Answer 1

You have the grouper column in the input$grouper var.
It's just a matter of unquoting it.
The line hchart(data, "column", hcaes(x = "grouper" , y = aantal)) should be:
hchart(data, "column", hcaes(x = !!input$grouper , y = aantal))
Full example (with iris data as you didn't provide an example of your own data):
library(shiny)
library(DT)
library(highcharter)
library(dplyr)
ui <- fluidPage(titlePanel("Dashboard"),
sidebarLayout(
sidebarPanel(uiOutput("groups")),
mainPanel(DT::dataTableOutput("summary"),
highchartOutput("plot"))
))
server <- function(input, output) {
mydata <- reactive({
iris
})
output$groups <- renderUI({
df <- mydata()
selectInput(
inputId = "grouper",
label = "Group variable",
choices = c("Petal.Length", "Species"),
selected = "Species"
)
})
summary_data <- reactive({
req(input$grouper)
mydata() %>%
dplyr::group_by(!!!rlang::syms(input$grouper)) %>%
dplyr::summarise(aantal = n()) %>%
dplyr::arrange(desc(aantal))
})
output$summary <- DT::renderDataTable({
DT::datatable(summary_data())
})
output$plot <- renderHighchart({
req(input$grouper)
data <- summary_data()
hchart(data, "column", hcaes(x = !!input$grouper, y = aantal))
})
}
shinyApp(ui, server)