About this extension

fluid_styled_slider is an example extension that provides everything to create a custom content element for TYPO3 CMS 8 and 9 based on the system extension fluid_styled_content (FSC).

A more detailed explanation of the following can be found at: https://usetypo3.com/custom-fsc-element.html

System Requirements

Obviously FSC needs to be installed in TYPO3 which is only possible in version 7.6 or higher. The extension is compatible with TYPO3 8LTS and TYPO3 9LTS. For versions compatible with TYPO3 7LTS check out the 1.x Tags.

Installation

Install the extension and include the static TypoScript.

The TypoScript includes JavaScript and CSS from external libraries that can be installed by running yarn install in the extension folder. This is not considered a good practice but is sufficient for an example extension like this one.

Components of a content element based on FSC

This extension adds a content element called fs_slider to the system. The following steps are necessary to get it up and running:

PageTSconfig

To make our content element appear in the wizard for new content elements, we have to add it via PageTSconfig

mod.wizards.newContentElement.wizardItems.common {
	elements {
		fs_slider {
			iconIdentifier = content-image
			title = LLL:EXT:fluid_styled_slider/Resources/Private/Language/locallang_be.xlf:wizard.title
			description = LLL:EXT:fluid_styled_slider/Resources/Private/Language/locallang_be.xlf:wizard.description
			tt_content_defValues {
				CType = fs_slider
			}
		}
	}
	show := addToList(fs_slider)
}

TCA

Now we need to tell TYPO3 what fields to show in the backend. Therefore we have to extend the tt_content TCA configuration. This stuff is done in the folder Configuration/TCA/Override. Let's add our new CType first (this could also be done in ext_tables.php):

\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTcaSelectItem(
    'tt_content',
    'CType',
    [
        'LLL:EXT:fluid_styled_slider/Resources/Private/Language/locallang_be.xlf:wizard.title',
        'fs_slider',
        'content-image'
    ],
    'textmedia',
    'after'
);

Now we determine what fields to show for our CType:

$GLOBALS['TCA']['tt_content']['types']['fs_slider'] = [
    'showitem'         => '
            --palette--;' . $frontendLanguageFilePrefix . 'palette.general;general,
            --palette--;' . $languageFilePrefix . 'tt_content.palette.mediaAdjustments;mediaAdjustments,
            pi_flexform,
        --div--;' . $customLanguageFilePrefix . 'tca.tab.sliderElements,
             assets
    '
];

TypoScript

The new CType fs_slider needs a rendering definition. This is rather simple:

tt_content {
	fs_slider < lib.contentElement
	fs_slider {
		templateName = FluidStyledSlider
		dataProcessing {
			10 = TYPO3\CMS\Frontend\DataProcessing\FilesProcessor
			10 {
				references.fieldName = assets
			}
			20 = DanielGoerz\FluidStyledSlider\DataProcessing\FluidStyledSliderProcessor
		}
	}
}

The lib.contentElement is not much more than the initialization of a FLUIDCONTENT object.

Note that before TYPO3 8LTS lib.contentElement was called lib.fluidContent!

We just change the template name (make sure to at least add your template path to lib.contentElement.templateRootPaths) and specify which dataProcessors we are gonna use. Oh right, dataProcessors.

DataProcessors

Those are PHP classes that get the data before it is passed to the fluidtemplate. They can manipulate the data or add stuff to be present in the template. The TYPO3\CMS\Frontend\DataProcessing\FilesProcessor for instance resolves all attached media elements for us, so we can access the FileReference objects in the view. DanielGoerz\FluidStyledSlider\DataProcessing\FluidStyledSliderProcessor is a custom processor to illustrate how this works.

class FluidStyledSliderProcessor implements DataProcessorInterface
{
    /**
     * Process data for the CType "fs_slider"
     *
     * @param ContentObjectRenderer $cObj The content object renderer, which contains data of the content element
     * @param array $contentObjectConfiguration The configuration of Content Object
     * @param array $processorConfiguration The configuration of this processor
     * @param array $processedData Key/value store of processed data (e.g. to be passed to a Fluid View)
     * @return array the processed data as key/value store
     * @throws ContentRenderingException
     */
    public function process(ContentObjectRenderer $cObj, array $contentObjectConfiguration, array $processorConfiguration, array $processedData)
    {
        // Content of $processedData will be available in the template
        // It can be processed here to your needs.
        $processedData['slider']['width'] = 1000;
        return $processedData;
    }

However, DataProcessors are optional.

The Fluid template

The last piece in the puzzle is the actual template that receives the data processed by all specified DataProcessors in the end. This is plain fluid as we know (and love) it:

    <html xmlns:f="http://typo3.org/ns/TYPO3/CMS/Fluid/ViewHelpers" data-namespace-typo3-fluid="true">
    <div class="fluid-styled-slider" style="width: {slider.width}px; margin: auto">
    	<f:for each="{files}" as="file">
    		<figure class="fluid-styled-slider-item">
    			<f:image image="{file}" height="{data.imageheight}" width="{data.imagewidth}" alt="{file.properties.alt}" title="{file.properties.title}"/>
    			<f:if condition="{file.properties.description}">
    				<figcaption>{file.properties.description}</figcaption>
    			</f:if>
    		</figure>
    	</f:for>
    </div>
    </html>

Of course we can use Layouts and Partials here as well. Note how {data} contains the tt_content row from the rendered content element. {files} is added by the TYPO3\CMS\Frontend\DataProcessing\FilesProcessor and contains the attached media as proper objects. {slider.width} is added by our own DataProcessor.

Optional: Preview in Page Module

We probably want some kind of preview for our editors in the page module. There are two notable possibilities to achieve this:

Fluid template via PageTSconfig

We can simply specify a fluid template to be rendered as preview in PageTSconfig:

mod.web_layout.tt_content.preview.fs_slider = EXT:fluid_styled_slider/Resources/Private/Templates/Preview/FluidStyledSlider.html

This template will receive all fields of the tt_content row directly. So {header} contains the header, {bodytext} contains the bodytext and so on.

tt_content_drawItem Hook

If we want to do more sophisticated stuff like getting child records resolved, we can register to the tt_content_drawItem hook like this:

$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['cms/layout/class.tx_cms_layout.php']['tt_content_drawItem']['fluid_styled_slider']
        = \DanielGoerz\FluidStyledSlider\Hooks\FsSliderPreviewRenderer::class;

Our class has to implement the \TYPO3\CMS\Backend\View\PageLayoutViewDrawItemHookInterface.

class FsSliderPreviewRenderer implements PageLayoutViewDrawItemHookInterface
{
    /**
     * Preprocesses the preview rendering of a content element of type "fs_slider"
     *
     * @param \TYPO3\CMS\Backend\View\PageLayoutView $parentObject Calling parent object
     * @param bool $drawItem Whether to draw the item using the default functionality
     * @param string $headerContent Header content
     * @param string $itemContent Item content
     * @param array $row Record row of tt_content
     * @return void
     */
    public function preProcess(PageLayoutView &$parentObject, &$drawItem, &$headerContent, &$itemContent, array &$row)
    {
        if ($row['CType'] === 'fs_slider') {
            $itemContent .= '<h3>Fluid Styled Slider</h3>';
            if ($row['assets']) {
                $itemContent .= $parentObject->thumbCode($row, 'tt_content', 'assets') . '<br />';
            }
            $drawItem = false;
        }
    }
}

Whatever we write into $itemContent will be rendered in the page module inside our content element.

Miscellaneous

This extension includes jQuery in JSFooterLibs. If you already have jQuery on your site, overwrite this in your TypoScript or set the constant plugin.tx_fluidstyledslider.settings.includejQuery to 0.