Loop | Plotly menu

Question

I have a dataset with the same structure as the Iris one but with 50+ variables. Therefore, I'd like to create a loop in order to automatically create the menu. Thanks!

library(plotly)
p <- iris %>%
plot_ly(
type = 'scatter', 
x = ~Sepal.Length, 
y = ~Petal.Length,
text = ~Species,
hoverinfo = 'text',
mode = 'markers', 
transforms = list(
list(
type = 'filter',
target = ~Species,
operation = '=',
value = unique(iris$Species)[1]
)
)) %>% layout(
updatemenus = list(
list(
type = 'dropdown',
active = 0,
buttons = list(
list(method = "restyle",
args = list("transforms[0].value", unique(iris$Species)[1]),
label = unique(iris$Species)[1]),
list(method = "restyle",
args = list("transforms[0].value", unique(iris$Species)[2]),
label = unique(iris$Species)[2]),
list(method = "restyle",
args = list("transforms[0].value", unique(iris$Species)[3]),
label = unique(iris$Species)[3])
)
)
)
)
p

Sada93 · Accepted Answer · 2019-03-09 08:56:56Z

The function iterates through the number of menu items and creates a button for each in the format plotly requires.

library(plotly)

get_menu_list <- function(names){
  n_names = length(names)
  buttons = vector("list",n_names)

  for(i in seq_along(buttons)){
    buttons[i] = list(list(method = "restyle",
                      args = list("transforms[0].value", names[i]),
                      label = names[i]))
  }

  return_list = list(
    list(
      type = 'dropdown',
      active = 0,
      buttons = buttons
    )
    )

    return(return_list)
}

p <- iris %>%
  plot_ly(
    type = 'scatter', 
    x = ~Sepal.Length, 
    y = ~Petal.Length,
    text = ~Species,
    hoverinfo = 'text',
    mode = 'markers', 
    transforms = list(
      list(
        type = 'filter',
        target = ~Species,
        operation = '=',
        value = unique(iris$Species)[1]
      )
    )) %>% layout(
      updatemenus = get_menu_list(unique(iris$Species))
    )

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