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Question

I'd like to have wrapped labels for categories. Plotly is displaying spaces where I want line breaks. When the strings get too long it just displays them at a 45 degree angle.

 plot_ly(x =c("this\nand\nthat\nand\nall\nof\nthe\nthings",
 "the\nother\nstring\nthat\nmakes\nthis\nway\ntoo\nlong"), 
 y = c(1,2), name = "testing",type = "bar")

I'm using Shiny / R

Answer 1

I'd recommend wrapping the strings in the data frame first. So if your data frame is

df <- data.frame(x = c("this\nand\nthat\nand\nall\nof\nthe\nthings",
                       "the\nother\nstring\nthat\nmakes\nthis\nway\ntoo\nlong"), 
                 y = c(1, 2))

Then wrap the strings with HTML line breaks at some sensible interval.

df$wrappedx <- sapply(df$x, 
                      FUN = function(x) {paste(strwrap(x, width = 16), collapse = "<br>")})

And then use that column instead. You may need to increase the margin at the bottom (in pixels).

plot_ly(data = df, 
        x = wrappedx,
        y = y,
        name = "testing",
        type = "bar") %>%
    layout(margin = list(b = 70))

In summary, \\n in strings are ignored in HTML so line breaks are <br> .