Grav plugin to create image galleries with unitegallery js library
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variar Added more documentation and link to demo site repo
Signed-off-by: Anton Filimonov <anton.filimonov@gmail.com>
Latest commit 4da8505 Oct 28, 2017

README.md

Grav Unitegallery Plugin

Unitegallery is a Grav Plugin that provides Twig extension for creating images gallery using Unitegallery javascript library

Demo site with default Grav installation and this plugin can be found in this repository.

Installation

Installing the Unitegallery plugin can be done in one of two ways. The GPM (Grav Package Manager) installation method enables you to quickly and easily install the plugin with a simple terminal command, while the manual method enables you to do so via a zip file.

GPM Installation (Preferred)

The simplest way to install this plugin is via the Grav Package Manager (GPM) through your system's terminal (also called the command line). From the root of your Grav install type:

bin/gpm install unitegallery

This will install the Unitegallery plugin into your /user/plugins directory within Grav. Its files can be found under /your/site/grav/user/plugins/unitegallery.

Manual Installation

To install this plugin, just download the zip version of this repository and unzip it under /your/site/grav/user/plugins. Then, rename the folder to unitegallery. You can find these files on GitHub.

You should now have all the plugin files under

/your/site/grav/user/plugins/unitegallery

NOTE: This plugin is a modular component for Grav which requires Grav, and a theme to be installed in order to operate.

Usage

The unitegallery provides new Twig extension that adds function unite_gallery to be used in templates. Pass images collection as firts argument and gallery options (json string) as optional second argument.

This functions goes through each image in passed collection, generates thumbnails (which are cached), collects images metadata and outputs special div as required by Unitegallery javascript library. Also all css and js files needed for selected theme are added to page assets.

NOTE: When page with the gallery is loaded first time thumbnails for each new image are generated. This can be quite time consuming process. Consider loading page manually when new images are added, so that users of your site will not encounter long page load time.

To create the gallery you should call unite_gallery from twig template for desired page. For example add template gallery.html.twig inside <your_theme>/templates/modular directory with simple content:

<div class="modular-row gallery-container {{ page.header.class }}">
	{{ unite_gallery(page.media.images) }}
</div>

Then create new subpage with name gallery.md inside your modular page and add some images so the structure looks like this:

user
|--pages
   |--page1
   |--page2
   |--page_with_gallery
      |--modular.md
      |--_pictures
         |--gallery.md
         |--image01.jpg
         |--image01.jpg.meta.yaml
         |--image02.jpg
         |--image02.jpg.meta.yaml

Content of gallery.md can be like this:

---
title: My fancy gallery
---

And modular.md simply includes child pages:

---
title: My Gallery Page

content:
  items: @self.modular
---

To pass custom gallery parameters modify twig template and pass them as json:

// with custom options (passed directly to unitegallery js function)
{{ unite_gallery(page.media.images, '{"gallery_theme":"tiles", "tiles_type":"justified"}') }}

Output html example:

  <div id="unite-gallery" style="display:none;">
		<img alt="Image 1 Title" src="/images/6/6/8/a/2/668a2df0c6571575ae7dd9216234864a4f7c4bc0.jpg"
			data-image="/images/9/f/a/5/d/9fa5d6c0eb6c711fd4a9f58f9c13c3f191b66cb4.jpg"
			data-description="Image 1 Description">
	</div>

  <script type="text/javascript">
    jQuery(document).ready(function(){
      jQuery("#unite-gallery").unitegallery({"tiles_type":"justified","gallery_theme":"tiles"});
    });
  </script>

Grav images metadata files are used to fill title and description using following properties mapping:

  • meta.alt_text is used for alt attribute
  • meta.description is used for data-description attribute

Issues with page caching

This plugin uses twig function to add assets (js and css) to the page. This doesn't work very well with Grav caching system. There are two workarounds:

  1. Disable twig caching for the gallery page. Adding never_cache_twig: true to gallery.md from example above should do the trick.
  2. Enabling assets_in_meta parameter for this plugin (either per page) or globally. This will save assets calculated during first twig processing and add them each time page is processed. This parameter is enabled by default. After switching it on cache for all gallery pages should be updated (either by cleaning all cache or by doing some changes to affected pages). For best perfomance consider disabling this mode globally and switching it on only for gallery pages. Using the example above modular.md should look like this:
    ---
    title: My Gallery Page
    
    content:
      items: @self.modular
    
    unitegallery:
      assets_in_meta: true
    ---
    

Several galleries in one modular page

If several galleries are going to be used on the same page then optional third argument should be passed to unite_gallery function to create div elements with custom ids:

// with custom div id
{{ unite_gallery(page.media.images, '{"gallery_theme":"tiles", "tiles_type":"justified"}', 'gallery1') }}
{{ unite_gallery(page.media.images, '{}', 'gallery2') }}

Also custom id can be set in json options:

// with custom div id in json options
{{ unite_gallery(page.media.images, '{"gallery_theme":"tiles", "grav_gallery_div_id":"gallery1"}') }}

This allows to create galleries from several subfolders of modular page:

user
|--pages
   |--page1
   |--page2
   |--page_with_gallery
      |--modular.md
      |--_photo1
      |  |--gallery.md
      |  |--image01.jpg
      |  |--image01.jpg.meta.yaml
      |  |--image02.jpg
      |  |--image02.jpg.meta.yaml
      |--_photo2
         |--gallery.md
         |--image01.jpg
         |--image01.jpg.meta.yaml
         |--image02.jpg
         |--image02.jpg.meta.yaml

To pass gallery ids from page header gallery.html.twig should be modified:

<div class="modular-row gallery-container {{ page.header.class }}">
	{{ unite_gallery(page.media.images, '{"gallery_theme":"tiles"}', page.header.unitegallery.gallery_id) }}
</div>

Then in gallery.md files for individual galleries set gallery_id in page header:

---
title: My fancy gallery
unitegallery:
  gallery_id: gallery1
---

Gallery in non-modular page

When using gallery in non-modular page gallery theme must be set in page header:

---
title: My fancy gallery
unitegallery:
  gallery_theme: tiles
---

Call to unite_gallery in page template must either take theme from page header or not set it at all:

<div class="gallery-container {{ page.header.class }}">
	{{ unite_gallery(page.media.images, '{"gallery_theme":"' ~ page.header.unitegallery.gallery_theme ~ '"}') }}
</div>

If there are issues with caching assest set assets_in_meta: true for this page.

Raw html output with gantry templates

When using gantry gallery.html.twig should be modifed to output correct html (pay attention to raw):

<div class="gallery-container {{ page.header.class }}">
	{{ unite_gallery(page.media.images)|raw }}
</div>

Config Defaults

enabled: true
assets_in_meta: true
gallery_theme: default
gallery_div_id: unite-gallery
thumb_width: 600
thumb_height: 600