Minimum checkbox selection
Is there anyway I can let a group of checkboxes have at least one choice?
I would like the vector to have at least one selection instead of zero. Is it possible to change the input element if this checkbox group doesn't support UI.R
library(shiny)
# Define UI for miles per gallon application
shinyUI(pageWithSidebar(
# Application title
titlePanel("Demo Assignment for SHINY Coursera"),
# Sidebar with checkbox to select the variable to plot against mpg
# and to specify whether outliers should be included
sidebarPanel(
selectInput("variable1", "Performance Variable:",
list("MPG" = "mpg",
"qsec" = "qsec")),
checkboxGroupInput("variable", "Variable:",
c("Cylinders" = "cyl",
"Displacement" = "disp",
"HP" = "hp",
"Rear Axle Ratio" = "drat",
"Weight" = "wt",
"Transmission" = "am",
"Carburetors" = "carb",
"Gears" = "gear"), selected = "cyl")
),
# Show the caption and plot of the requested variable against mpg
mainPanel(
h4(textOutput("Var_1")),
h4(textOutput("Var_2")),
h4(textOutput("caption")),
h4("Analysis:"),
plotOutput("mpgPlot")
)
))
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