Configures a backend preview for a content element.


Have also a look at Configure custom backend preview for content element for more details.


The recommended location of the preview renderer configuration is in the ctrl array in your extension's Configuration/TCA/$table.php or Configuration/TCA/Overrides/$table.php file. The former is used when your extension is the one that creates the table, the latter is used when you need to override TCA properties of tables added by the Core or other extensions.

Use for any record in a table

This specifies the preview renderer to be used for any record in tx_myextension_domain_model_mytable:

    = \MyVendor\MyExtension\Preview\PreviewRenderer::class;

Table has a type field/attribute

This specifies the preview renderer only for records of type $type as determined by the type field of your table.

    = \MyVendor\MyExtension\Preview\PreviewRenderer::class;

Table has a subtype_value_field setting

If your table and field have a subtype_value_field TCA setting (like tt_content.list_type) and you want to register a preview renderer that applies only when that value is selected (for example, when a certain plugin type is selected and you can not match it with the type of the record alone):

    = \MyVendor\MyExtension\Preview\PreviewRenderer::class;

Where $type is for example list (indicating a plugin) and $subType is the value of the list_type field when the type of plugin you want to target is selected as plugin type.