For SAPUI5 applications I often use the option valueHelpOnly="true" if an input field can only have the content of a ValueHelp. Is there such a possibility also for SAP RAP applications?
Yes, this is possible in RAP based applications using consumption annotations. You can use below annotation to have an input field only the content from Value Help.
Consumption.valueHelpDefinition.useForValidation
It accepts boolean values
You can read more about this annotation in below documentation:
The data is validated such that the UI sends a read request to the backend using the value you entered as a key. When the value is not available the request fails and the errornous entry will be highlighted as errornous.
The annotation and thus the triggering of an error message if the entered value does not match one in the ValueHelp only works in conjunction with another input field....
In my case, I have a mandatory date field. If I enter the date, I can also enter any text in the other field. If I leave the date empty and enter a text, it will be checked against the ValueHelp.
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