Teaser Selection

The “teaser_selection” content type is used for displaying teasers to other content in your website. These teasers could be arranged as list or grid, like in this example:

In the administration interface, the widget is displayed as a selector for the teasers. Content managers can choose a number of target contents. By default, the text from the “Excerpt & Categories” tab of the target content is shown. You can however customize the text of the teaser if you like.

Configuration

Add a field of type “teaser_selection” to your page template:

<!-- config/templates/pages/overview.xml -->
<?xml version="1.0" ?>
<template xmlns="http://schemas.sulu.io/template/template"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xmlns:xi="http://www.w3.org/2001/XInclude"
          xsi:schemaLocation="http://schemas.sulu.io/template/template http://schemas.sulu.io/template/template-1.0.xsd">

    <!-- ... -->

    <properties>
        <!-- ... -->

        <property name="teasers" type="teaser_selection">
            <meta>
                <title lang="en">Teasers</title>
            </meta>
        </property>

        <!-- ... -->
    </properties>
</template>

Twig

In Twig, the field contains an array of teasers. Iterate the array and format the teasers as you like:

<div>
    {% for teaser in content.teasers %}
        <article>
             <h3>
                 {{ teaser.title }}
             </h3>

             {% set teaserImage = sulu_resolve_media(teaser.mediaId, app.request.locale) %}

             {% if teaserImage %}
                 <img src="{{ teaserImage.formats['300x'] }}" alt="{{ teaserImage.title }}">
             {% endif %}

             <div>
                  {{ teaser.description|raw }}
             </div>

             <a href="{{ sulu_content_path(teaser.url) }}">
                 {{ teaser.moreText|default('Read more') }}
             </a>
        </article>
    {% endfor %}
</div>

Each teaser is an object with the following properties:

Property	Type	Description
id	string	The ID of the teaser
type (e.g. content or article)	string	The type of the teaser
locale	string	The locale, e.g. “de_AT”
title	string	The title of the teaser. This is usually taken from the “Excerpt & Categories” tab of the target content, but can be changed for each teaser
description	string	The description of the teaser. This is usually taken from the “Excerpt & Categories” tab of the referenced content, but can be changed for each teaser
moreText	string	The text of the “More” link
mediaId	string	The ID of the image displayed with the teaser. Defaults to the first image in the tab “Excerpt & Categories”, but can be changed for each teaser
url	string	The relative URL of the target content

Parameters

The following parameters can be used to customize the field in the page template:

Parameter	Type	Description
present_as	collection	A collection of strings. Each string is typically a CSS class that is used to render the teaser list. You can configure the <title> of each entry that is shown in the admin
min	string	The minimum number of selected teasers
max	string	The maximum number of selected teasers

Configurable Presentation

Sometimes, a content manager wants to control exactly how a list of teasers is presented. You can plan for different rendering variants in your design and let the content manager choose one variant in the administration interface.

Use the present_as option to configure the rendering variants:

<!-- config/templates/pages/overview.xml -->
<?xml version="1.0" ?>
<template xmlns="http://schemas.sulu.io/template/template"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xmlns:xi="http://www.w3.org/2001/XInclude"
          xsi:schemaLocation="http://schemas.sulu.io/template/template http://schemas.sulu.io/template/template-1.0.xsd">

    <!-- ... -->

    <properties>
        <!-- ... -->

        <property name="teasers" type="teaser_selection">
            <meta>
                <title lang="en">Teasers</title>
            </meta>

            <params>
                <param name="present_as" type="collection">
                    <param name="three-columns">
                        <meta>
                            <title lang="en">3 Columns</title>
                        </meta>
                    </param>
                    <param name="five-columns">
                        <meta>
                            <title lang="en">5 Columns</title>
                        </meta>
                    </param>
                </param>
            </params>
        </property>

        <!-- ... -->
    </properties>
</template>

The content manager can choose one of these variants in the administration interface:

The selected value can be used to set the CSS class of the teaser element in Twig:

<ul property="teasers" class="{{ view.teasers.presentAs|default('') }}">
    {% for teaser in content.teasers %}
        <li><a href="{{ sulu_content_path(teaser.url) }}">{{ teaser.title }}</a></li>
    {% endfor %}
</ul>

Custom Content with Teaser Providers

If you want to display teasers of custom data, create an implementation of TeaserProviderInterface. For example, we’ll make it possible to select from a list of recipes:

<?php

namespace AppBundle\Teaser;

use Sulu\Bundle\PageBundle\Teaser\Configuration\TeaserConfiguration;
use Sulu\Bundle\PageBundle\Teaser\Provider\TeaserProviderInterface;
use Sulu\Bundle\PageBundle\Teaser\Teaser;

class RecipeTeaserProvider implements TeaserProviderInterface
{
    /**
     * Returns the configuration for rendering the teaser provider in the
     * administration interface
     *
     * @return TeaserProvider
     */
    public function getConfiguration()
    {
        return new TeaserConfiguration(
            'Recipe', // The title in the dropdown of the administration interface
            'recipes', // The resourceKey of the entities to load for this type of teaser
            'table', // The list adapter in which the entities should be shown
            ['title'], // The properties which should be shown
            'Recipe', // The title of the overlay that shows when this entity is assigned
            'app.recipe_edit_form', // The view to which a click on an item in the Admin UI will navigate (optional)
            ['id' => 'id'], // The mapping of the teaserItem to the path parameters of the above view (optional)
        );
    }

    /**
     * Returns the actual teaser data.
     *
     * @return Teaser[] The teasers
     */
    public function find(array $ids, $locale)
    {
        if (0 === count($ids)) {
            return [];
        }

        $items = ...; // load items by id

        foreach ($items as $item) {
            $result[] = new Teaser(...);
        }

        return $result;
    }
}

Register the provider in Symfony’s service container and tag it with sulu.teaser.provider to make it functional:

<service id="recipe_teaser_provider" class="AppBundle\Teaser\RecipeTeaserProvider">
    <tag name="sulu.teaser.provider" alias="{your teaser-type}"/>
</service>