Is there a way to customize hoverinfo in a ggplotly object?
For example,
p <- ggplot(mtcars, aes(x = disp, y= am, color = as.factor(cyl)))+geom_point()
ggplotly(p)
The hover information box here contains three variables:disp,am and factor(cyl). How to include more variables or exclude existing variables in the hover information box?
Thanks!
You can include required variables in aes() then use tooltip to specify which should be displayed:
p <- ggplot(mtcars, aes(x = disp, y= am, color = as.factor(cyl),
gear=gear, hp=hp))+geom_point()
ggplotly(p,tooltip = c("x", "gear", "hp"))
If you want to add html formatting to your hover information you can set the text attribute using paste() in the aes() funtction. Then you use the text value from the aes() in tooltip argument in ggplotly():
p <- ggplot(mtcars, aes(x = disp, y= am, color = as.factor(cyl),
text= paste("Displacment: ", disp, "<br>",
"Automatic: ", am, "<br>",
"Number of cylinders: ", cyl, "<br>",
"mpg: ", mpg, sep = "")))+
geom_point()
ggplotly(p, tooltip = c("text"))
This approach allows you to include variables, which are not included in the standard aes() arguments, to the hover info (like mpg in the above code chunk).
A cleaner way is to just add everything within the ggplot environment, using aesthetics two times, in order to pass just the full, single object onto ggplotly():
p <- ggplot(mtcars, aes(label = gear, label2 = hp)) +
geom_point(aes(x = disp, y= am, color = as.factor(cyl)))
ggplotly(p)
