R shiny: How to get square plot to use full width of panel? -


i have square plot (aspect ratio 1:1) i'm trying scale full width of mainpanel. due height parameter being 400px default, plot comes out 400x400 image in middle of panel:

enter image description here

i read can alter height parameter of plotoutput "100%" or "auto" have panel use natural dimensions of image. however, plotoutput tries retrieve height parameter renderplot, getting height value plotoutput resulting in "catch-22" scenario , plot of height 0px.

what i'm trying set height value of renderplot (or plotoutput) equal width of mainpanel, i'm unsure how access value. here's code far:

library( shiny ) library( ggplot2 )  server <- function(input, output) {     output$plot1 <- renderplot({         x <- data.frame( x=rnorm(input$n), y=rnorm( input$n ) )         ggplot( x, aes(x=x, y=y) ) + geom_point() + coord_fixed()     }, height=400   # how value mainpanel width?     ) }  ui <- fluidpage(     sidebarlayout(          sidebarpanel(             sliderinput("n", "number of samples", min=10, max=1000, value=100) ),         mainpanel( plotoutput("plot1", height="auto") )     ) )  shinyapp(ui = ui, server = server)

any thoughts?

based on this post:

library( shiny ) library( ggplot2 )  server <- function(input, output) {   output$plot1 <- renderplot({     x <- data.frame( x=rnorm(10), y=rnorm( 10) )     ggplot( x, aes(x=x, y=y) ) + geom_point() +  coord_fixed()     } ,     height=reactive(ifelse(!is.null(input$innerwidth),input$innerwidth*3/5,0))   ) }  ui <- fluidpage(   sidebarlayout(      sidebarpanel(       tags$head(tags$script('$(document).on("shiny:connected", function(e) {                             shiny.oninputchange("innerwidth", window.innerwidth);                             });                             $(window).resize(function(e) {                             shiny.oninputchange("innerwidth", window.innerwidth);                             });                             ')),       sliderinput("n", "number of samples", min=10, max=1000, value=100) ),     mainpanel( plotoutput("plot1"))   ) )  shinyapp(ui = ui, server = server)

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