Home Button in Header in R shiny Dashboard - r

Question

I am trying to add a home button in the header of my Shiny app so that whenever anyone clicks it from any tab, it will redirect to the first page. Currently I am using one actionButton in every tab with observeEvent to go back to first page.
I am not able to add any actionButton in the header section of Shiny app. Is there any way around for this feature?
It is something like this:
Sample Shiny Look
Reproducible Code:
library(shiny)
library(shinydashboard)
library(shinyjs)
options(shiny.maxRequestSize=1000*1024^2)
app <- shinyApp(
a <- dashboardPage(
dashboardHeader(title = "Sample Shiny", titleWidth=1450),
dashboardSidebar(sidebarMenu(id='tabs',
menuItem("Welcome", tabName = "welcome"),
menuItem("Tab1", tabName = "tab1"),
menuItem("Tab2",
menuSubItem("Tab2_1", tabName = "tab2_1"),
menuSubItem("Tab2_2", tabName = "tab2_2"))
)
),
dashboardBody( shinyjs::useShinyjs(),
tabItems(
tabItem(tabName="welcome", tabPanel(title = "Score",fluidRow(valueBoxOutput("box_01"),valueBoxOutput("box_02")))),
# First tab content
tabItem(tabName = "tab1",actionButton("homeButton1", "Home")),
# Second tab content
tabItem(tabName = "tab2_1",tabsetPanel(id = "test",tabPanel(title = "tab2_1",actionButton("homeButton2", "Home"),actionButton("NextButton2", "Tab3")))),
tabItem(tabName = "tab2_2",tabsetPanel(id = "outputTabset",tabPanel(title = "Tab 3",actionButton("homeButton3", "Home"))))
)
)),
b<-shinyServer(function(input, output, session) {
##########Links from first page
output$box_01 <- renderValueBox({
box1<-valueBox(value=01,
icon = icon("database",lib="font-awesome")
,width=NULL
,color = "blue"
,href="#"
,subtitle=HTML("<b>Tab 1</b>")
)
box1$children[[1]]$attribs$class<-"action-button"
box1$children[[1]]$attribs$id<-"button_box_01"
return(box1)
})
output$box_02 <- renderValueBox({
box2<-valueBox(value=02,
icon = icon("user-secret",lib="font-awesome")
,width=NULL
,color = "yellow"
,href="#"
,subtitle=HTML("<b>Tab 2</b>")
)
box2$children[[1]]$attribs$class<-"action-button"
box2$children[[1]]$attribs$id<-"button_box_02"
return(box2)
})
observeEvent(input$button_box_01,{
if(input$button_box_01[1]>0){
newtab <- switch(input$tabs,
"welcome" = "tab1",
"tab1" = "welcome"
)
updateTabItems(session, "tabs", newtab)
} })
observeEvent(input$button_box_02,{
if(input$button_box_02[1]>0){
newtab <- switch(input$tabs,
"welcome" = "tab2_1",
"tab2_1" = "welcome"
)
updateTabItems(session, "tabs", newtab)
} })
### HomeButtons
observeEvent(input$homeButton1,{
newtab <- switch(input$tabs,
"welcome" = "tab1",
"tab1" = "welcome"
)
updateTabItems(session, "tabs", newtab)
})
observeEvent(input$homeButton2,{
newtab <- switch(input$tabs,
"welcome" = "tab2_1",
"tab2_1" = "welcome"
)
updateTabItems(session, "tabs", newtab)
})
observeEvent(input$NextButton2,{
newtab <- switch(input$tabs,
"tab2_2" = "tab2_1",
"tab2_1" = "tab2_2"
)
updateTabItems(session, "tabs", newtab)
})
observeEvent(input$homeButton3,{
newtab <- switch(input$tabs,
"welcome" = "tab2_2",
"tab2_2" = "welcome"
)
updateTabItems(session, "tabs", newtab)
})
#######SideBar Disable
addClass(selector = "body", class = "sidebar-collapse")
})
)
shiny::runApp(app,launch.browser=TRUE,host="0.0.0.0",port=6105)

Answer 1

See the following solution. You need to style the position with CSS, still. Key is to put the actionButton into the header with tags$li(class = "dropdown", ...), otherwise dashboardHeader will not accept it:
ui <- dashboardPage(
dashboardHeader(title = "Demo", tags$li(class = "dropdown", actionButton("home", "Home"))),
dashboardSidebar(sidebarMenu(id = "sidebar", # id important for updateTabItems
menuItem("Home", tabName = "home", icon = icon("house")),
menuItem("Tab1", tabName = "tab1", icon = icon("table")),
menuItem("Tab2", tabName = "tab2", icon = icon("line-chart")),
menuItem("Tab3", tabName = "tab3", icon = icon("line-chart")))
),
dashboardBody(
tabItems(
tabItem("home", "This is the home tab"),
tabItem("tab1", "This is Tab1"),
tabItem("tab2", "This is Tab2"),
tabItem("tab3", "This is Tab3")
))
)
server = function(input, output, session){
observeEvent(input$home, {
updateTabItems(session, "sidebar", "home")
})
}
shinyApp(ui, server)

Answer 2

Here's an option using javascript and a home icon which fits into the header nicely:
dashboardHeader(title = "Your Title",
tags$li(a(onclick = "openTab('home')",
href = NULL,
icon("home"),
title = "Homepage",
style = "cursor: pointer;"),
class = "dropdown",
tags$script(HTML("
var openTab = function(tabName){
$('a', $('.sidebar')).each(function() {
if(this.getAttribute('data-value') == tabName) {
this.click()
};
});
}")))
)
Change home in the openTab('home') part to whatever your home tab is called and it will switch to that tab when clicked.