Overwrite YAML-Files of individual forms with typoscript - typo3

Question

i tried for a few hours to overwrite some parameters in a yaml file of a form with typoscript. I found this passage in the manual:
https://docs.typo3.org/c/typo3/cms-form/9.5/en-us/Concepts/FrontendRendering/Index.html?highlight=formdefinitionoverrides#typoscript-overrides
But i could not get it to work. Additional i could not find a way to debug my yaml definitions. I tried the hint with
typo3/sysext/form/Classes/Mvc/Configuration/ConfigurationManager.php::getConfigurationFromYamlFile()
but this shows only the prototypes not the forms.
So i do have some questions:
is there a possibility to debug the combined code of yaml and typoscript for a form?
does formDefinitionOverrides as described in the manual really work (TYPO3 9.5)
what is ? The identifier of my form in the yaml file or the identifier in the frontend with the number of the content element (myFormIdentifier-UidOfMyContentElement)
is it possible to work with identifiers instead of array indizes? (multiple nested array indizes with up to 10 or more entries driving me crazy.
Thanks!

Answer 1

I found how to use labels instead of using numbered arrays:
the yaml:
type: Form
identifier: test1
prototypeName: standard
renderables:
page1:
renderingOptions:
previousButtonLabel: 'Previous step'
nextButtonLabel: 'Next step'
type: Page
identifier: page-1
label: Step
renderables:
field1:
defaultValue: ''
type: Text
identifier: email-1
label: 'My Email address'
properties:
validationErrorMessages:
-
code: 1221559976
message: öasdlkhfö
and the typoscript:
plugin.tx_form{
settings{
formDefinitionOverrides {
# identifier of form
test1 {
renderables {
# first page of form
page1 {
renderables {
field1 {
label = TEXT
label.value = Eine ganze andere E-Mailaddresse
}
}
}
}
}
}
}
}
works nice, but you cannot mix it - all fileds in one level has to get labels. That makes sense because it is not possible to mix indices and keys in a php array.

Answer 2

Yes, it does work. Here's an example.
The identifier in this example is "myformEN".
With TypoScript you can't do it without this nested array syntax.
TypoScript
plugin.tx_form{
settings{
yamlConfigurations.100 = EXT:user_site/Configuration/Form/CustomFormSetup.yaml
formDefinitionOverrides {
# identifier of form
myformEN {
renderables {
# first page of form
0 {
renderables {
# number of element in form
0 {
# another level (because of "Grid: Row")
renderables {
0 {
defaultValue = TEXT
defaultValue.value = My Text
}
}
}
}
}
}
}
}
}
}
myformEN.form.yaml
renderingOptions:
submitButtonLabel: 'submit'
identifier: myformEN
label: 'Inquiry'
type: Form
prototypeName: standard
[…]
renderables:
-
renderingOptions:
previousButtonLabel: ''
nextButtonLabel: Next
identifier: page-1
label: ''
type: Page
renderables:
-
type: GridRow
identifier: gridrow-1
label: 'Grid: Row'
renderables:
-
defaultValue: 'this will be overwritten by TypoScript'
type: Text
identifier: article
label: Article
-
defaultValue: ''
type: Text
identifier: text-2
label: 'Amount'
[…]