Change size of hover text in Plotly
Question
I am building a Plotly plot based on a ggplot in R. I would like to increase the size of the text in the hover boxes. Suppose I have a scatterplot like this:
library(plotly)
library(ggplot2)
d <- data.frame(a = sample(1:50, 30, T),
b = sample(1:50, 30, T),
col = factor(sample(1:3, 30, T)))
gg <- ggplot() + geom_point(aes(x = a, y = b, color = col), data = d)
p <– plotly_build(gg)
p
Is there a way to change the size of the hover text?
2 answers
solution1
5 ACCPTED 2016-07-10 17:17:58
Currently there seems to be no built-in way to pass additional attributes to define the hover appearance directly via plotly (see github issue #102 ). However, in the issue description you see the name of the class used for the hover text, which is .hovertext . The simplest solution would be to save you plotly as an HTML file and add the CSS below by hand somewhere in the <head> part of the HTML. In case you want to change the size of the legend text as well, keep the .legendtext lines, if not erase them.
<style type="text/css">
.hovertext text {
font-size: 100px !important;
}
.legendtext {
font-size: 30px !important;
}
</style>
If you want to inject the CSS using R instead of doing it by hand you have several options.
# the CSS we want to inject
css <- '
<style type="text/css">
.hovertext text {
font-size: 100px !important;
}
.legendtext {
font-size: 30px !important;
}
</style>'
library(plotly)
library(htmltools)
library(htmlwidgets)
1: modify the HTML file after creation
x <- as.widget(p) # convert to htmlwidget object
saveWidget(x, file="test_edited_1.html") # and save to file
l <- readLines("test_edited_1.html") # read file
h <- paste(l, collapse= " ")
hh <- strsplit(h, "<head>")[[1]] # split where head appears
h.new <- paste(hh[1], css, hh[-1], collapse=" ") # insert CSS
writeLines(h.new, "test_edited_1.html") # write back to file
2: modify the object from which the HTML file is created
x <- as.widget(p) # convert to htmlwidget object
# add a the code directly into <head> using `htmltools::htmlDependency`
x$dependencies <- list(
htmlDependency(
name = "custom",
version="1",
src="",
head=css)
)
saveWidget(x, file="test_edited_2.html")
While the second works, I am not sure if it is a proper use of htmlDependency .
Result
solution2
5 2017-07-25 12:51:44
There has been an update to plotly recently that allows you to change various characteristics of the hover text. Here's an example in R:
plot_ly(x=c(1:42),
y=c(1:42),
text=c(1:42),
type="bar")%>%
layout(
title = paste("Top 42"),
hoverlabel = list(font=list(size=10))
)
There are also options to change font color, bgcolor, and more.
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