Hi Alexander,
You can use calculation fields to do some custom validation: https://help.podio.com/hc/en-us/articles/201019358-Calculations
This won't reject the values, but you can show the item is invalid in that field.
Best,
Andreas
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PHP Script for Field Value Validation
Hallo is it possible to implement Javascript or PHP behind a field for some validation tasks?
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@Andreas: Thanks for the hint. As far as I have seen I can use Javascript. Do you know if there are some limitations? Jqeury? Can I also use PHP.
I was thinking about "blocking" the submit button, if it is not correct.
The calculation field is basically a Javascript program which will be run when the dependencies of the field are changed. The value returned by the program will be stored as the value of the field. You can use this value to show whether the item is considered valid or not, but you won't be able to disable the submit button.