In shinydashboard, one can create menuItem()s, which are tabs in the sidebar. I want to be able to poll which tab is active, by using the standard input$foo syntax.
However, I was not able to do so. I tried by referencing the menuItem()'s tabName or id but that did nothing.
Is there a way to do it?
sidebarMenu have optional id parametr you can use it
sidebarMenu(id="menu1",
menuItem("PointA_",tabName = "PointA")
)
On server side use input$menu1
Full working example, print PointA or PointB ( which tap active)
library(shiny)
library(shinydashboard)
ui <- dashboardPage(
dashboardHeader(
title = "Shiny"
),
dashboardSidebar(
sidebarMenu(id="sbmenu",
menuItem("PointA_",tabName = "PointA") ,
menuItem("PointB_",tabName = "PointB")
)
),
dashboardBody(
tabItems(
tabItem("PointA",h1("a")),
tabItem("PointB",h1("b"))
)
)
)
server <- function(input, output) {
observe(print(input$sbmenu))
}
shinyApp(ui,server)
Find a bit hack variant to do active+ dropdown + input
with using additional fucntion ( get idea here )
working example:
library(shiny)
library(shinydashboard)
convertMenuItem <- function(mi,tabName) {
mi$children[[1]]$attribs['data-toggle']="tab"
mi$children[[1]]$attribs['data-value'] = tabName
if(length(mi$attribs$class)>0 && mi$attribs$class=="treeview"){
mi$attribs$class=NULL
}
mi
}
ui <- dashboardPage(
dashboardHeader(
title = "Shiny"
),
dashboardSidebar(
sidebarMenu(id="sbmenu",
convertMenuItem(menuItem("PointA_",tabName="PointA", selected=TRUE,
checkboxInput("tc", "Test check", value=FALSE)
),'PointA') ,
convertMenuItem(menuItem("PointB_",tabName="PointB",checkboxInput("tc2", "Test check", value=FALSE)
),'PointB')
)
),
dashboardBody(
tabItems(
tabItem("PointA",h1("a")),
tabItem("PointB",h1("b"))
)
)
)
server <- function(input, output) {
observe({
print(input$sbmenu)
})
}
shinyApp(ui,server)
I dont know about documectation about children etc.
But if you lok at differences between menuItem and menuItem+additionlal element you can see :
aa=menuItem("PointA_",tabName="PointA", selected=TRUE,
checkboxInput("tc", "Test check", value=FALSE)
)
aa1=menuItem("PointA_",tabName="PointA", selected=TRUE)
> aa
<li class="treeview">
<a href="#shiny-tab-PointA">
<span>PointA_</span>
<i class="fa fa-angle-left pull-right"></i>
</a>
<ul class="treeview-menu">
<div class="form-group shiny-input-container">
<div class="checkbox">
<label>
<input id="tc" type="checkbox"/>
<span>Test check</span>
</label>
</div>
</div>
</ul>
</li>
> aa1
<li>
<a href="#shiny-tab-PointA" data-toggle="tab" data-value="PointA" data-start-selected="1">
<span>PointA_</span>
</a>
</li>
So as you see aa1 have data-toggle="tab" data-value="PointA" and you need it to add to aa
But aa have class="treeview" ( i tried to delete this class in inspect to check what changed) you need delete it .
About children you can see at evirioment view in Rstudio
