Hey there!
tl;dr:
It's about caching.
The logical explanation:
TEXT is potentially cached, COA_INT is not.
Think about the second request. TEXT is supposed to not be recalculated but
taken from cache. How can that depend on COA_INT, which might calculate
differently compared to how it resulted during the previous request?
The technical explanation:
Wow, I'm old. Back in the days, there used to be something called the "TYPO3
Frontend Rendering Process".
Here it is:
https://buzz.typo3.org/uploads/media/TYPO3_Frontend_Rendering_Process_v1.5.pdf
TEXT is calculated on step 31 ("generate the page"), COA_INT as well as
USER_INT are calculated on step 32 ("include non-cached objects").
Although that diagram is accurate for v4.1 and a lot of things have change
since then, there's still a lot a lot of truth in that picture :).
The very technical explanation:
During step 31 of the previous diagram, all COA_INT and USER_INT sections are
assumed as placeholder strings.
It's something like ""
See:
https://github.com/TYPO3/TYPO3.CMS/blob/7254650107f48732b963d5ef8c6838bdd02ff1bd/typo3/sysext/frontend/Classes/ContentObject/ContentObjectArrayInternalContentObject.php#L38
That's what goes to the cache: The string output of the cachable part of your
website filled with a couple of those INT_SCRIPT placeholders.
During step 32, all INT scripts are finally executed and their placeholder are
replaced by the per-request individual result.
So I assume the TypoScript "if" part just casts
"" to true.
Regards,
Stephan Schuler
Softwareentwickler | netlogix Web Solutions
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Von: typo3-english-boun...@lists.typo3.org
im Auftrag von tcrass
Gesendet: Dienstag, 6. März 2018 22:22
An: typo3-english@lists.typo3.org
Betreff: [TYPO3-english] COA always true when used in if.isTrue.cObject?
Dear all,
I've observed some -- at least: to me -- quite puzzling behavior in my
Typo3 7.6 installation. Consider the following TypoScript:
lib.textWithContent = TEXT
lib.textWithContent.value = foo
lib.textWithoutContent = TEXT
lib.textWithoutContent.value =
lib.coaWithContent = COA_INT
lib.coaWithContent {
10 = TEXT
10.value = foo
}
lib.coaWithoutContent = COA_INT
lib.coaWithoutContent {
10 = TEXT
10.value =
}
page.10 = TEXT
page.10 {
value = This should be visible (TEXT)...
if.isTrue.cObject < lib.textWithContent
}
page.20 = TEXT
page.20 {
value = This should be invisible (TEXT)...
if.isTrue.cObject < lib.textWithoutContent
}
page.30 = TEXT
page.30 {
value = This should be visible (COA)...
if.isTrue.cObject < lib.coaWithContent
}
page.40 = TEXT
page.40 {
value = This should be invisible (COA)...
if.isTrue.cObject < lib.coaWithoutContent
}
I'd expect entries 20 and 40 of the page array to not show up in the
rendered page, but alas! here's what I get:
This should be visible (TEXT)...This should be visible (COA)...This
should be invisible (COA)...
Obviously, the empty COA object at lib.coaWithoutContent is considered
being not-empty in page.40.if.isTrue.cObject < lib.coaWithoutContent.
Any explanation?
Cheers --
Torsten
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