We can flexibly add a web image inside of a table with web_image() function. The function provides a convenient way to generate an HTML fragment with an image URL. Because this function is currently HTML-based, it is only useful for HTML table output. To use this function inside of data cells, it is recommended that the text_transform() function is used. With that function, we can specify which data cells to target and then include a web_image() call within the required user-defined function (for the fn argument). If we want to include an image in other places (e.g., in the header, within footnote text, etc.) we need to use web_image() within the html() helper function.

Usage

web_image(url, height = 30)

Arguments

url

A url that resolves to an image file.

height

The absolute height (px) of the image in the table cell.

Value

A character object with an HTML fragment that can be placed inside of a cell.

Details

By itself, the function creates an HTML image tag, so, the call web_image("http://example.com/image.png") evaluates to:

<img src=\"http://example.com/image.png\" style=\"height:30px;\">

where a height of 30px is a default height chosen to work well within the heights of most table rows.

Examples

Get the PNG-based logo for the R Project from an image URL.

r_png_url <- "https://www.r-project.org/logo/Rlogo.png"

Create a tibble that contains heights of an image in pixels (one column as a string, the other as numerical values), then, create a gt table. Use the text_transform() function to insert the R logo PNG image with the various sizes.

dplyr::tibble(
pixels = px(seq(10, 35, 5)),
image = seq(10, 35, 5)
) %>%
gt() %>%
text_transform(
locations = cells_body(columns = image),
fn = function(x) {
web_image(
url = r_png_url,
height = as.numeric(x)
)
}
)

Get the SVG-based logo for the R Project from an image URL.

r_svg_url <- "https://www.r-project.org/logo/Rlogo.svg"

Create a tibble that contains heights of an image in pixels (one column as a string, the other as numerical values), then, create a gt table. Use the tab_header() function to insert the R logo SVG image once in the title and five times in the subtitle.

dplyr::tibble(
pixels = px(seq(10, 35, 5)),
image = seq(10, 35, 5)
) %>%
gt() %>%
title = html(
"<strong>R Logo</strong>",
web_image(
url = r_svg_url,
height = px(50)
)
),
subtitle = html(
web_image(
url = r_svg_url,
height = px(12)
) %>%
rep(5)
)
)

Function ID

8-1

Other image addition functions: ggplot_image(), local_image(), test_image()