Silverstripe CMS Elemental

Introduction

This module extends a page type to swap the content area for a list of manageable elements to compose a page out of rather than a single text field. Features supported:

• Versioning of elements
• Ability to add, remove supported elements per elemental area

The module provides basic markup for each of the elements but you will likely need to provide your own styles. Replace the $Content variable with $ElementalArea in your page templates, and rely on the markup of the individual elements.

For a more detailed overview of using this module, please see the User help guides.

Requirements

• Silverstripe CMS ^5.0
• Versioned Admin ^2.0
• GridFieldExtensions ^4.0

For a CMS 4.3+ compatible version of this module, please see the 4.x release line.

For a Silverstripe CMS 4.1 or 4.2 compatible version of this module, please see the 2.x or 3.x release line.

Installation

composer require dnadesign/silverstripe-elemental

composer require dnadesign/silverstripe-elemental

The following YAML config will enable elements on every `Page` object,
replacing the standard `Content` rich text field.

**mysite/_config/elements.yml**

```yaml
Page:
  extensions:
    - DNADesign\Elemental\Extensions\ElementalPageExtension

In your page type layout template use $ElementalArea to render the elements to the page (in place of $Content).

Getting more elements

Note that this module comes by default with the base element and a "Content" element. If you need more, take a look at some other modules:

Silverstripe CMS supported content block modules

To learn more about Silverstripe CMS supported content block types see, Creating new blocks.

• dnadesign/silverstripe-elemental: Text content (built-in)
• silverstripe/silverstripe-elemental-fileblock: File and image block
• silverstripe/silverstripe-elemental-bannerblock: Banner with call-to-action and content
• dnadesign/silverstripe-elemental-userforms: Embed a user defined form

Examples of community built content block modules (not a comprehensive list - may not be updated for Elemental 4 yet)

• dnadesign/silverstripe-elemental-list: Container for elements (allows layouts)
• dnadesign/silverstripe-elemental-virtual: Reuse elements across pages
• dynamic/silverstripe-elemental-blocks: Elemental Blocks will add the following Elements to your site
  • Accordion: content in collapsable panels
  • Countdown: time left until a set date and time
  • Customer Service: map, directions, and contact info for your location
  • Embeded Code: embed code like iframes, javascript
  • Featured Content: large image, headline, description, link. one per row
  • File List: A list of files for download
  • Flexslider: Flexslider slideshow
  • Gallery: display a collection of images
  • Image: single image
  • oEmbed: embed content from YouTube, SoundCloud, etc
  • Promos: small image, headline, description, link. 3 to 4 per row
  • Recent Blog Posts: list of the most recent posts of a specific blog
  • Section Navigation: list of child pages or pages in current level
  • Sponsors: sponsor logos in a row
  • Tab Set: Create a tabbed interface that uses elements
  • Testimonials: list of customer testimonials, filter by category

Helpful modules

These modules can extend functionality, and make elemental more compatible with other approaches in Silverstripe CMS:

• dnadesign/silverstripe-elemental-subsites: Compatibility with the silverstripe/subsites module
• dnadesign/silverstripe-elemental-skeletons: Creates a template of elements which can be created for a page in the CMS

Configuration

Limit to specific page type

If you want to use elements alongside traditional page types, you can define an "empty" page type and assign the extension only to this type.

mysite/src/MyElementPage.php

<?php
class MyElementPage extends Page
{
}

mysite/_config/elements.yml

MyElementPage:
  extensions:
    - DNADesign\Elemental\Extensions\ElementalPageExtension

Migrating existing page content

You can use the MigrateContentToElement BuildTask that is provided to assist with migrating content from pages to elements. For more information on using this task refer to the content migration documentation.

Customize HTML and markup

The basic element area is rendered into the DNADesign/Elemental/Models/ElementalArea.ss template. This loops over each of the element controller instances. Each controller instance will render $ElementHolder which represents the element contained within a holder div. The wrapper div is the ElementHolder.ss template.

To customise the ElementEditor in the CMS you will need to use the Silverstripe CMS JS Injector to apply transformations to the necessary React components. See here for more information.

Limit allowed elements

You may wish to only enable certain elements for the CMS authors to choose from rather than the full set. This can be done according to various page types:

Page:
  allowed_elements:
    - DNADesign\Elemental\Models\ElementContent

Likewise, you can exclude certain elements from being used.

Page:
  disallowed_elements:
    - YourCompany\YourModule\Elements\ElementContact

Sharing elements between pages

By default the page to element relationship is a "has one", meaning you cannot share elements between pages. If this functionality is desired, you could take a look at the silverstripe-elemental-virtual module which helps to achieve this.

Defining your own elements

An element is as simple as a PHP class which extends DNADesign\Elemental\Models\BaseElement, and a template to go with it (unless you want it to use the default template). After you add the class, ensure you have rebuilt your database and reload the CMS.

The getSummary() method will be used to provide a short summary to content authors of what data is in the element.

<?php

use DNADesign\Elemental\Models\BaseElement;

class MyElement extends BaseElement
{
    private static $singular_name = 'my element';

    private static $plural_name = 'my elements';

    private static $description = 'What my custom element does';

	public function getCMSFields()
    {
        $fields = parent::getCMSFields();

        // ...

        return $fields;
    }

    public function getSummary(): string
    {
        return /* some string that represents the data in this element */;
    }

    public function getType()
    {
        return 'My Element';
    }
}

In-line Editing

Elements can be edited in the CMS using an inline form where all your elements appear together. For elements that are more complex (e.g. use custom FormField classes) you can disable the in-line edit form by setting private static $inline_editable = false in your element class. A GridFieldDetailForm will be used to edit blocks that are not in-line editable. Alternatively as the CMS element editor is now React driven, in-line editing functionality can be added to by defining your own React components.

Note: The default is that all elements are in-line editable.

If in-line editing is not disabled, whilst not having a custom component defined, custom fields will not be rendered unless the field's schemaDataType is set See Framework's FormField definition.

After building your own React components and including them into the CMS, altering the applicable Element's PHP definition to use the new React component can be achieved by setting some protected properties of that class.

    protected $schemaDataType = FormField::SCHEMA_DATA_TYPE_CUSTOM;
    protected $schemaComponent = 'BlockLinkField';

• The $schemaDataType does not need to be CUSTOM, but should not be STRUCTURAL as structural types are not submitted as form data.
• The $schemaComponent is the name of the React component you have created to be used.

The above example was taken from silverstripe/elemental-bannerblock

Defining your own HTML

MyElement will be rendered into a MyElement.ss template with the ElementHolder.ss wrapper. Changing the holder template can be done via YAML, or by using a $controller_template on your subclass.

private static $controller_template = 'MyElementHolder';

To customise existing block templates such as Content and Form templates, copy the relevant files from vendor/dnadesign/silverstripe-elemental/templates to your theme. When doing this, ensure you match the folder structure (PHP class namespace) to ensure that your new template version takes priority.

Note: The default set of elements follow the [BEM (Block Element Modifier])(http://getbem.com/) class naming convention, which allows developers to style individual parts of the DOM without unnecessarily nested CSS. Where possible, we encourage you to follow this naming system.

Position Helpers

In your BaseElement template you can use the following variables for additional logic or styling helpers. They behave in the same way traditional SS_Viewer methods work either returning a Boolean, String or a Int

1. $First (boolean)
2. $Last (boolean)
3. $Pos (int)
4. $TotalItems (int)
5. $EvenOdd (string - 'even' or 'odd')

<div class="element element--{$EvenOdd} <% if First %>element--first<% end_if %> <% if Last %>element--last<% end_if %>">
    // ...
</div>

Style variants

Via YAML you can configure a whitelist of style variants for each BaseElement subclass. For instance, if you have dark and light variations of your content block you would enter the following in YAML in the format (class: 'Description'). The class will be added to the ElementHolder.

DNADesign\Elemental\Models\ElementContent:
  styles:
    light: 'Light Background'
    dark: 'Dark Background'

Disabling the default stylesheets

When installing this module, there may be a default set of CSS stylesheets that come to provide some examples for the various default element types for the front-end website.

You can disable this with YAML configuration:

# File: mysite/_config/elements.yml
DNADesign\Elemental\Controllers\ElementController:
  include_default_styles: false

Implementing search

The Elemental module comes with an indexer for Solr (via the silverstripe-fulltextsearch module). You can enable this index in your search engine to ensure that a page's elemental area content is indexed under the page's data.

For information on configuring Solr please see the fulltextsearch documentation.

Note: If using this indexer, be aware that HTML tags will be stripped from the content before it is indexed. The Solr search results may add in emphasis tags or other formatting around matched key words, so you may need to allow unescaped HTML in your search results template. You should use the $Excerpt property (see SolrIndex::search for more) to display the relevant search matches.

Disabling CMS content search

When installing this module, the page model admin search will look for a term in the entire content of each elemental pages. This is done by rendering each page, which can be resource hungry and make the search timeout.

You can disable this with YAML configuration:

# File: mysite/_config/elements.yml
DNADesign\Elemental\Controllers\ElementSiteTreeFilterSearch:
  search_for_term_in_content: false

Usage of GridField

This module used to use GridField to create and update Elements in the CMS. This has now been largely succeeded by a JavaScript interface via React. However elements that are marked as being incompatible with in-line editing will still use the GridField method.

Building the elemental frontend assets

This module uses the Silverstripe CMS Webpack module, and inherits things from the core Silverstripe CMS modules, such as a core variable sheet and Javascript components.

When making changes to either the SASS or Javascript files, ensure you change the source files in client/src/.

You can have yarn watch and rebuild delta changes as you make them (for development only):

yarn watch

When you're ready to make a pull request you can rebuild them, which will also minify everything. Note that watch will generate source map files which you shouldn't commit in for your final pull request. To minify and package:

yarn build

You'll need to have yarn installed globally in your command line.

Note: If adding or modifying colours, spacing, font sizes etc. please try and use an appropriate variable from the silverstripe/admin module if available.

Integration with other modules

• Multiple languages with tractorcow/silverstripe-fluent
• Search through silverstripe/fulltextsearch

Screenshots

Versioning

This library follows Semver. According to Semver, you will be able to upgrade to any minor or patch version of this library without any breaking changes to the public API. Semver also requires that we clearly define the public API for this library.

All methods, with public visibility, are part of the public API. All other methods are not part of the public API. Where possible, we'll try to keep protected methods backwards-compatible in minor/patch versions, but if you're overriding methods then please test your work before upgrading.

Reporting Issues

Please create an issue for any bugs you've found, or features you're missing.

Credits

Silverstripe Elemental was created by DNA Design.

CMS Icon blocks by Creative Stall from the Noun Project.