Cfrgtkky

I am trying to find a way to create ticks, (or lines), between the grouped bars in plotly.

This is my data:

   year <- 2001:2012

   groupA <- round(runif(12,10,15),0)

   groupB <- round(runif(12,10,15),0)

mydata <- data.frame(year, groupA, groupB)



xa <- list(title = 'Count',

           showticklabels = TRUE,

           overlaying = "x",

           autotick = F,

           dtick = 1,

           tickangle = -45)



plot_ly(

  mydata, 

  x = ~year,

  y = ~groupA,

  name = "Group A",

  type = 'bar') %>% 

  add_trace(y = ~groupB, name = 'Group B') %>% 

  layout(yaxis = list(title = 'Count'),

         xaxis = c(xa),

         barmode = 'group')

What I am trying to add is something like this to the layout without effecting the xaxis title and look.

xa2 <- list(

            showticklabels = FALSE,

            autotick = F,

            dtick = 1,

            ticks = "inside",

            tick0 = 0.5,

            dtick = 0.5)

I would be happy with vertical line, but, tick is the preferred option I am looking for: