Formatting mouse over labels in plotly when using ggplotly

Question

I am struggling with text formatting when using ggplotly and the mouse over functionality.

library(plotly) df <- data.frame(a=letters, b=LETTERS, x=runif(26), y=runif(26)) g <- ggplot(df, aes(x,y)) + geom_point(aes(text=sprintf('letter: %s\nLetter: %s', a, b))) g (gg <- ggplotly(g)) 

I would like to have some formatted text or at least a newline in my mouse over label. Is there a good documentation on how to design this mouse over bubble thing?

Answer 1

See the tooltip argument to ggplotly(). For instance, to show only the species name (e.g. virginica for the top right point) on hover:

g <- ggplot(tail(iris), aes(Petal.Length, Sepal.Length, text=Species)) + geom_point() ggplotly(g, tooltip="text") 

Other examples:

ggplotly(g, tooltip="x")             # Petal.Length: 5.7 ggplotly(g, tooltip="Petal.Length")  # Petal.Length: 5.7 ggplotly(g, tooltip=c("x", "y")) 

The last example will show the two-line tooltip

Petal.Length: 5.7 Sepal.Length: 6.7 

Answer 2

plotly can make use of the line break HTML tag. You can get what your after using the <br> tag for a newline:

g <- ggplot(df, aes(x,y)) +         geom_point(aes(text=sprintf("letter: %s<br>Letter: %s", a, b)))  (gg <- ggplotly(g))