Dependency-free lightboxes

lightbox, photo, web, front-end
bower install lightestbox



Create simple lightboxes to pop up images. Lightestbox is library-agnostic, has no dependencies and weighs in at only 3 KB of Javascript and 1 KB of CSS.

Use it with jQuery, Zepto or Ender; or compile it in with Browserify and your favorite tools.


First off, you'll need to include the CSS and JS:

<link rel="stylesheet" href="lightestbox.min.css">
<link rel="stylesheet" href="lightestbox.min.js">

Let's say we have this html:

<a id="foo" class="boxy" href="img1.png">Link 1</a>
<a id="bar" class="boxy" href="img2.png">Link 2</a>
<span id="baz" class="boxy" data-img="img3.png">Link 3</span>

Once Lightestbox and the DOM are loaded, we can run:

var elements = document.getElementsByClassName('lightbox');

var L = new lightestbox(elements);
var more_elements = document.getElementsByClassName('other-elements')

Note that we're not limited to <a> tags. Setting a data-img attribute will let Lightestbox work nicely with most elements.


But wait, you probably don't want to deal with all that getElementById junk. If you're running Zepto or jQuery, just include the appropriate lightestbox.*.min.js file and you can do this:

<link rel="stylesheet" href="lightestbox.jquery.min.js">

Note that you don't have to include lightestbox.min.js if you're using the jQuery or Zepto modules. You will need the CSS, though.

See the examples directory for examples using vanilla JS, jQuery and Zepto.


Want your image to have a caption? Add a title attribute to your link, and that text will be your caption. Don't like the way the caption looks? Write some CSS - the selector is .lightestbox-wrapper figcaption.

Don't want your title attribute used that way? Read on!


Lightestbox is a purposefully minimal tool, but there are a few options:

  • prefix: By default, the elements created have CSS classes with the prefix 'ltbx'. Useful if you want multiple styles of lightboxes on a single page?
  • maxWidth: The maximum width of the images.
  • useTitle: When false, Lightestbox ignores the title element and looks for a data-caption attribute instead.

Pass arguments just like you would imagine:

    maxWidth: 600, // in pixels
    useTitle: false,
    prefix: 'special'

If you're using Lightestbox without a library, pass the options as the second argument when you create the Lightestbox object:

var L = new lightestbox(false, {useTitle: false});

Display style

Lightestbox comes with a bare-bones style for the pop-ups, with the expectation is that developers will customize it. For reference, here are the elements it adds to the DOM:

<div class="ltbx-wrapper" style="width: <dynamic>; height: <dynamic>;">
<!-- lightestbox-wrapper dynamically expands fit the window -->
    <div class="ltbx-loading" style="display: block;">
    <!-- by default, lightestbox-loading has a simple css animation. Grab another one or add a animated gif background-image -->
    <figure style="display: block; width: <dynamic>; height: <dynamic>;">
        <img src="img.png">