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Mar 28, 2025
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Improve hint regarding unavailable variables #1553

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Improve hint regarding unavailable variables
d-s-codappix Mar 25, 2025
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linawolf Mar 28, 2025
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6 changes: 6 additions & 0 deletions Documentation/Conditions/Index.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -792,6 +792,9 @@ traverse()
# Traverse query parameters of current request along tx_news_pi1[news]
[request && traverse(request.getQueryParams(), 'tx_news_pi1/news') > 0]

# Traverse page properties for current page
[traverse(page ?? [], "pid") == 65]

.. tip::
Checking for the :ref:`request object <t3coreapi:typo3-request>` to be
available before using :typoscript:`traverse()` may be necessary, for
Expand All @@ -801,6 +804,9 @@ traverse()
available). This avoids the error
`Unable to call method "getQueryParams" of non-object "request"`.

Same is true for the `page` variable, which might not be available
in all contexts, for example backend modules without a page.
One can use the `?? []` workaround.

.. index:: Conditions; compatVersion
.. _condition-function-compatVersion:
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