Lightbox

IMPORTANT NOTE: The lightbox extension is now a built-in feature of Quarto v1.4 (https://quarto.org/docs/prerelease/1.4/lightbox.html) so if you are using this version or later there is no need to install this extension.

An extension that uses the GLightbox javascript library to add lightbox styling and behavior to images in your HTML documents.

Installation

To install this extension in your current directory (or into the Quarto project that you're currently working in), use the following command:

quarto add quarto-ext/lightbox

Usage

The Lightbox extension is implemented as a filter in Quarto. Once installed, using the extension is easy.

Apply To Images Automatically

The Lightbox extension can automatically give images in your web page a lightbox treatment. You can enable this like:

---
title: Simple Lightbox Example
filters:
   - lightbox
lightbox: auto
---

![A Lovely Image](mv-1.jpg)

You can exclude an image from receiving this automatic treatment by giving it a nolightbox class, like so:

![Don't lightbox me!](mv-1.jpg){.nolightbox}

Choose Specific Images

Add lightbox to the list of filters in your _quarto.yml file or your document front matter. For example:

---
title: Simple Lightbox Example
filters:
   - lightbox
---

Add the class lightbox to any images that you'd like to have the lightbox treatment. For example:

---
title: Simple Lightbox Example
filters:
   - lightbox
---

![A Lovely Image](mv-1.jpg){.lightbox}

Galleries

In addition to simply providing a lightbox treatment for individual images, you can also group images into a 'gallery'. When the user activates the lightbox, they will be able to page through the images in the gallery without returning to the main document. To create galleries of images, apply a group attribute (with a name) to the images that you'd like to gather into a gallery. Images with the same group name will be placed together in a gallery when given a lightbox treatment.

For example, the following three images will be treated as a gallery:

![A Lovely Image](mv-1.jpg){group="my-gallery"}

![Another Lovely Image](mv-2.jpg){group="my-gallery"}

![The Last Lovely Image](mv-3.jpg){group="my-gallery"}

Global Options

The following options may be specified in the front matter for lightbox:

Option	Description
`match`	Set this to `auto` if you'd like any image to be given lightbox treatment. If you omit this, only images with the class `lightbox` will be given the lightbox treatment.
`effect`	The effect that should be used when opening and closing the lightbox. One of `fade`, `zoom`, `none`. Defaults to `zoom`.
`desc-position`	The position of the title and description when displaying a lightbox. One of `top`, `bottom`, `left`, `right`. Defaults to `bottom`.
`loop`	Whether galleries should 'loop' to first image in the gallery if the user continues past the last image of the gallery. Boolean that defaults to `true`.
`css-class`	A class name to apply to the lightbox to allow css targeting. This will replace the lightbox class with your custom class name.

A complete example:

---
title: Complete Lightbox Example
filters:
  - lightbox
lightbox:
  match: auto
  effect: fade
  desc-position: right
  loop: false
  css-class: "my-css-class"
---

Per Image Attributes

The following options may be specified as attributes on individual images to control the lightbox behavior:

Option	Description
`desc-position`	The position of the title and description when displaying a lightbox. One of `top`, `bottom`, `left`, `right`. Defaults to `bottom`

Using lightbox with computation cells

Options for lightbox can be passed using chunk option lightbox like the following:

```{r}
#| fig-cap: Simple demo R plot 
#| lightbox:
#|   group: r-graph
#|   description: This is 1 to 10 plot
plot(1:10, rnorm(10))
```

It is possible to create several plots, and group them in a lightbox gallery. Use list in YAML for options when you have several plots, on per plot.

```{r}
#| fig-cap: 
#|   - Caption for first plot
#|   - Caption for second plot
#| lightbox: 
#|   group: cars
#|   description: 
#|     - This is the decription for first graph
#|     - This is the decription for second graph
plot(mtcars)
plot(cars)
```

When lightbox: auto is in main YAML config, you can opt-out lightbox on a plot by setting lightbox: false When lightbox: auto is not set, you can opt-in for lightbox on a specific plot by setting lightbox: true or by setting lightbox with some options.

Example

Here is the source code for a minimal example: example.qmd

This is the output of example.qmd.