TYPO3 v15 dev-main snapshot ()

2026-08-10 22:31:09 +02:00
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+.. include:: /Includes.rst.txt
+
+.. _feature-104896-1726046146:
+
+================================================
+Feature: #104896 - Raise Fluid Standalone to 4.0
+================================================
+
+See :issue:`104896`
+
+Description
+===========
+
+TYPO3 13 now uses Fluid 4 as the new base version. Old TYPO3 versions
+will keep using Fluid 2, which will still receive bugfixes if necessary.
+For detailed information about this release, please refer to the
+`dedicated release notes on GitHub <https://github.com/TYPO3/Fluid/releases/tag/4.0.0>`_.
+
+With the update to Fluid 4, tag-based ViewHelpers now have proper
+support for boolean attributes. Before this change, it was very
+cumbersome to generate these with Fluid, now it is implemented similar
+to popular JavaScript frameworks by using the newly introduced
+boolean literals:
+
+..  code-block:: html
+
+    <my:viewhelper async="{true}" />
+    Result: <tag async="async" />
+
+    <my:viewhelper async="{false}" />
+    Result: <tag />
+
+
+Of course, any variable containing a boolean can be supplied as well:
+
+..  code-block:: html
+
+    <my:viewhelper async="{isAsync}" />
+
+
+This can also be used in combination with variable casting:
+
+..  code-block:: html
+
+    <my:viewhelper async="{myString as boolean}" />
+
+
+For compatibility reasons empty strings still lead to the attribute
+being omitted from the tag.
+
+
+Impact
+======
+
+For existing installations, negative consequences of this update should be
+minimal as deprecated features will still work. Users are however advised
+to look into the already announced deprecations and to update their code
+accordingly. This update helps with this by now writing log messages to the
+deprecation log (if activated) if any deprecated feature is used in the
+TYPO3 instance.
+
+.. index:: Fluid, ext:fluid