364 lines
15 KiB
Markdown
364 lines
15 KiB
Markdown
---
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title: "Helpers"
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permalink: /docs/helpers/
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excerpt: "Jekyll `_includes` and other helpers to use as shortcuts for creating archives, galleries, table of contents, and more."
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gallery:
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- url: /assets/images/unsplash-gallery-image-1.jpg
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image_path: /assets/images/unsplash-gallery-image-1-th.jpg
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alt: "placeholder image 1"
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title: "Image 1 title caption"
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- url: /assets/images/unsplash-gallery-image-2.jpg
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image_path: /assets/images/unsplash-gallery-image-2-th.jpg
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alt: "placeholder image 2"
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title: "Image 2 title caption"
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- url: /assets/images/unsplash-gallery-image-3.jpg
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image_path: /assets/images/unsplash-gallery-image-3-th.jpg
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alt: "placeholder image 3"
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title: "Image 3 title caption"
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feature_row:
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- image_path: /assets/images/unsplash-gallery-image-1-th.jpg
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alt: "placeholder image 1"
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title: "Placeholder 1"
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excerpt: "This is some sample content that goes here with **Markdown** formatting."
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- image_path: /assets/images/unsplash-gallery-image-2-th.jpg
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alt: "placeholder image 2"
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title: "Placeholder 2"
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excerpt: "This is some sample content that goes here with **Markdown** formatting."
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url: "#test-link"
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btn_label: "Read More"
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btn_class: "btn--inverse"
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- image_path: /assets/images/unsplash-gallery-image-3-th.jpg
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title: "Placeholder 3"
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excerpt: "This is some sample content that goes here with **Markdown** formatting."
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last_modified_at: 2018-01-03T11:30:42-05:00
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toc: true
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toc_label: "Helpers"
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toc_icon: "gears"
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---
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You can think of these Jekyll helpers as little shortcuts. Since GitHub Pages doesn't allow most plugins --- [custom tags](https://jekyllrb.com/docs/plugins/#tags) are out. Instead the theme leverages [**includes**](https://jekyllrb.com/docs/templates/#includes) to do something similar.
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## Base Path
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**Deprecated**. Use `absolute_url` filter instead.
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Instead of repeating `{% raw %}{{ site.url }}{{ site.baseurl }}{% endraw %}` over and over again to create absolute URLs, you can use `{% raw %}{{ base_path }}{% endraw %}` instead. Simply add `{% raw %}{% include base_path %}{% endraw %}` to layouts, posts, pages, collections, or other includes and you're good to go.
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**ProTip:** It's a good practice to use absolute URL paths for assets (especially post images) so they correctly resolve in the site's XML feeds. Example: `{% raw %}{{ "/assets/images/filename.jpg" | absolute_url }}{% endraw %}` ~> `https://yourdoamin.com/assets/images/filename.jpg`
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{: .notice--info}
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## Group by Array
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[Jekyll Group-By-Array](https://github.com/mushishi78/jekyll-group-by-array) by Max White.
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A liquid include file for Jekyll that allows an object to be grouped by an array.
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The Liquid based taxonomy archives found amongst the demo pages rely on this helper.
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| Description | | |
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| ----------- | ------------------------ | --------------------------- |
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| All posts grouped by category | [Source][category-array] | [Demo][category-array-demo] |
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| All posts grouped by tag | [Source][tag-array] | [Demo][tag-array-demo] |
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[category-array]: https://github.com/{{ site.repository }}/blob/master/docs/_pages/category-archive.html
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[category-array-demo]: {{ "/categories/" | absolute_url }}
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[tag-array]: https://github.com/{{ site.repository }}/blob/master/docs/_pages/tag-archive.html
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[tag-array-demo]: {{ "/tags/" | absolute_url }}
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## Figure
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Generate a `<figure>` element with a single image and caption.
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| Include Parameter | Required | Description |
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| ---- | -------- | ----------- |
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| **image_path** | **Required** | Full path to image eg: `/assets/images/filename.jpg`. Use absolute URLS for those hosted externally. |
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| **alt** | Optional | Alternate text for image. |
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| **caption** | Optional | Figure caption text. Markdown is allowed. |
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Using the `figure` include like so:
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```liquid
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{% raw %}{% include figure image_path="/assets/images/unsplash-image-10.jpg" alt="this is a placeholder image" caption="This is a figure caption." %}{% endraw %}
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```
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Will output the following:
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{% include figure image_path="/assets/images/unsplash-image-10.jpg" alt="this is a placeholder image" caption="This is a figure caption." %}
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```html
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<figure>
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<img src="/assets/images/unsplash-image-10.jpg" alt="this is a placeholder image">
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<figcaption>This is a figure caption.</figcaption>
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</figure>
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```
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## Gallery
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Generate a `<figure>` element with optional caption of arrays with two or more images.
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To place a gallery add the necessary YAML Front Matter.
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| Name | Required | Description |
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| ---- | -------- | ----------- |
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| **url** | Optional | URL to link gallery image to (eg. a larger detail image). |
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| **image_path** | **Required** | Full path to image eg: `/assets/images/filename.jpg`. Use absolute URLS for those hosted externally. |
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| **alt** | Optional | Alternate text for image. |
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| **title** | Optional | Title text for image. Will display as a caption in a Magnific Popup overlay when linked to a larger image with `url`. |
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```yaml
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gallery:
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- url: /assets/images/unsplash-gallery-image-1.jpg
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image_path: /assets/images/unsplash-gallery-image-1-th.jpg
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alt: "placeholder image 1"
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title: "Image 1 title caption"
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- url: /assets/images/unsplash-gallery-image-2.jpg
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image_path: /assets/images/unsplash-gallery-image-2-th.jpg
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alt: "placeholder image 2"
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title: "Image 2 title caption"
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- url: /assets/images/unsplash-gallery-image-3.jpg
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image_path: /assets/images/unsplash-gallery-image-3-th.jpg
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alt: "placeholder image 3"
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title: "Image 3 title caption"
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```
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And then drop-in the gallery include in the body where you'd like it to appear.
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| Include Parameter | Required | Description | Default |
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| ----------------- | -------- | ----------- | ------- |
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| **id** | Optional | To add multiple galleries to a document uniquely name them in the YAML Front Matter and reference in `{% raw %}{% include gallery id="gallery_id" %}{% endraw %}` | `gallery` |
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| **class** | Optional | Use to add a `class` attribute to the surrounding `<figure>` element for additional styling needs. | |
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| **caption** | Optional | Gallery caption description. Markdown is allowed. | |
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```liquid
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{% raw %}{% include gallery caption="This is a sample gallery with **Markdown support**." %}{% endraw %}
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```
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**Gallery example with caption:**
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{% include gallery caption="This is a sample gallery with **Markdown support**." %}
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**More Gallery Goodness:** A few more examples and [source code](https://github.com/{{ site.repository }}/blob/master/docs/_posts/2010-09-09-post-gallery.md) can be seen in [this sample gallery post]({{ "" | absolute_url }}{% post_url 2010-09-09-post-gallery %}).
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{: .notice--info}
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## Feature Row
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Designed to compliment the [`splash`]({{ "/docs/layouts/#splash-page-layout" | absolute_url }}) page layout as a way of arranging and aligning "feature blocks" containing text or image.
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To add a feature row containing three content blocks with text and image, add the following YAML Front Matter
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| Name | Required | Description | Default |
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| ---- | ----------- | ----------- | ------- |
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| **image_path** | **Required** | Full path to image eg: `/assets/images/filename.jpg`. Use absolute URLS for those hosted externally. | |
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| **alt** | Optional | Alternate text for image. | |
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| **title** | Optional | Content block title. | |
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| **excerpt** | Optional | Content block excerpt text. Markdown is allowed. | |
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| **url** | Optional | URL that the button should link to. | |
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| **btn_label** | Optional | Button text label. | `more_label` in UI Text data file. |
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| **btn_class** | Optional | Button style. See [utility classes]({{ "/docs/utility-classes/#buttons" | absolute_url }}) for options. | `btn` |
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```yaml
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feature_row:
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- image_path: /assets/images/unsplash-gallery-image-1-th.jpg
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alt: "placeholder image 1"
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title: "Placeholder 1"
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excerpt: "This is some sample content that goes here with **Markdown** formatting."
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- image_path: /assets/images/unsplash-gallery-image-2-th.jpg
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alt: "placeholder image 2"
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title: "Placeholder 2"
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excerpt: "This is some sample content that goes here with **Markdown** formatting."
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url: "#test-link"
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btn_label: "Read More"
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btn_class: "btn--inverse"
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- image_path: /assets/images/unsplash-gallery-image-3-th.jpg
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title: "Placeholder 3"
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excerpt: "This is some sample content that goes here with **Markdown** formatting."
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```
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And then drop-in the feature row include in the body where you'd like it to appear.
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| Include Parameter | Required | Description | Default |
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| ----------------- | -------- | ----------- | ------- |
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| **id** | Optional | To add multiple rows to a document uniquely name them in the YAML Front Matter and reference in `{% raw %}{% include feature_row id="row2" %}{% endraw %}` | `feature_row` |
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| **type** | Optional | Alignment of the featured blocks in the row. Options include: `left`, `center`, or `right` aligned. | |
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```liquid
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{% raw %}{% include feature_row %}{% endraw %}
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```
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{% include feature_row %}
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**More Feature Row Goodness:** A [few more examples]({{ "/splash-page/" | absolute_url }}) and [source code](https://github.com/{{ site.repository }}/blob/master/docs/_pages/splash-page.md) can be seen in the demo site.
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{: .notice--info}
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## Responsive Video Embed
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Embed a video from YouTube or Vimeo that responsively sizes to fit the width of its parent.
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| Parameter | Required | Description |
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|---------- |--------- | ----------- |
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| `id` | **Required** | ID of the video |
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| `provider` | **Required** | Hosting provider of the video, either `youtube` or `vimeo` |
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### YouTube
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To embed the following YouTube video at url `https://www.youtube.com/watch?v=XsxDH4HcOWA` (long version) or `https://youtu.be/XsxDH4HcOWA` (short version) into a post or page's main content you'd use:
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```liquid
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{% raw %}{% include video id="XsxDH4HcOWA" provider="youtube" %}{% endraw %}
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```
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{% include video id="XsxDH4HcOWA" provider="youtube" %}
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To embed it as a video header you'd use the following YAML Front Matter
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```yaml
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header:
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video:
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id: XsxDH4HcOWA
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provider: youtube
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```
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### Vimeo
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To embed the following Vimeo video at url `https://vimeo.com/97649261` into a post or page's main content you'd use:
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```liquid
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{% raw %}{% include video id="97649261" provider="vimeo" %}{% endraw %}
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```
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{% include video id="97649261" provider="vimeo" %}
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To embed it as a video header you'd use the following YAML Front Matter
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```yaml
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header:
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video:
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id: 97649261
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provider: vimeo
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```
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## Table of Contents
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Auto-generated table of contents list for your posts and pages can be enabled using two methods.
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![table of contents example]({{ "/assets/images/mm-toc-helper-example.jpg" | absolute_url }})
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### Enabled via YAML Front Matter
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Add `toc: true` to the YAML Front Matter of any post or page.
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| Parameter | Required | Description | Default |
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| --------- | -------- | ----------- | ------- |
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| **toc** | Optional | Show table of contents. (boolean) | `false` |
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| **toc_label** | Optional | Table of contents title. (string) | `toc_label` in UI Text data file. |
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| **toc_icon** | Optional | Table of contents icon, displays before the title. (string) | [Font Awesome](https://fontawesome.com/icons?d=gallery&s=solid&m=free) <i class="fas fa-file-alt"></i> **file-alt** icon. Other FA icons can be used instead. |
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**TOC example with custom title and icon**
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```yaml
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---
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toc: true
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toc_label: "My Table of Contents"
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toc_icon: "cog"
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---
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```
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**Note:** using both methods will have unintended results. Be sure to remove `{% raw %}{% include toc %}{% endraw %}` placed table of contents from your content when using `toc: true`.
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{: .notice--warning }
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### Enabled via `toc` include (deprecated)
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To include a Kramdown [auto-generated table of contents](https://kramdown.gettalong.org/converter/html.html#toc) for posts and pages, add the following helper to your content.
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```liquid
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{% raw %}{% include toc %}{% endraw %}
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```
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**Note:** this method only works with Markdown files.
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{: .notice--warning}
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**Deprecated:** `toc` helper will be removed in the next major version of the theme. It is encouraged that you migrate to the YAML Front Matter method above.
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{: .notice--danger}
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| Parameter | Required | Description | Default |
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| --------- | -------- | ----------- | ------- |
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| **title** | Optional | Table of contents title. (string) | `toc_label` in UI Text data file. |
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| **icon** | Optional | Table of contents icon, displays before the title. (string) | [Font Awesome](https://fontawesome.com/icons?d=gallery&s=solid&m=free) <i class="fas fa-file-alt"></i> **file-alt** icon. Other FA icons can be used instead. |
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**TOC example with custom title and icon**
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```liquid
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{% raw %}{% include toc icon="cog" title="My Table of Contents" %}{% endraw %}
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```
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## Navigation List
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Include an unordered list of links to be used as sidebar navigation with the `nav_list` helper.
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**1.** Start by adding a set of titles and URLs to `_data/navigation.yml` in the same way the [`main` navigation]({{ "/docs/navigation/" | absolute_url }}) is built.
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`foo` navigation example:
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```yaml
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# _data/navigation.yml
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foo:
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- title: "Link 1 Title"
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url: /link-1-page-url/
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- title: "Link 2 Title"
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url: http://external-link.com
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- title: "Link 3 Title"
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url: /link-3-page-url/
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- title: "Link 4 Title"
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url: /link-4-page-url/
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```
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For a navigation list that has child pages you'd structure the YAML like this:
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```yaml
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# _data/navigation.yml
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foo:
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- title: "Parent Link 1"
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url: /parent-1-page-url/
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children:
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- title: "Child Link 1"
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url: /child-1-page-url/
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- title: "Child Link 2"
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url: /child-2-page-url/
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- title: "Parent Link 2"
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url: /parent-2-page-url/
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children:
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- title: "Child Link 1"
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url: /child-1-page-url/
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- title: "Child Link 2"
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url: /child-2-page-url/
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- title: "Child Link 3"
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url: /child-3-page-url/
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```
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**2:** On the page(s) you'd like the `foo` sidebar nav add the following YAML Front Matter, referencing the same key name.
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```yaml
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sidebar:
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nav: "foo"
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```
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**ProTip:** If you're applying the same navigation list to several pages setting it as a [Front Matter default](https://jekyllrb.com/docs/configuration/#front-matter-defaults) is the better option.
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{: .notice--info}
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The theme's documentation is built with the `nav_list` helper so if you'd like an example to dissect take a look at `navigation.yml`, `_config.yml` and `_doc` collection in the [`/docs/` folder](https://github.com/{{ site.repository }}/tree/master/docs/) of this repo.
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To add a navigation list to a post or page's main content instead of the sidebar use the include this way:
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```liquid
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{% raw %}{% include nav_list nav="foo" %}{% endraw %}
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```
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{% include nav_list nav="foo" %}
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| Parameter | Required | Description |
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| --------- | -------- | ----------- |
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| items | **Required** | Name of the links array found in `_data/navigation.yml`. |
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