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  • thanks for the suggestion! I already tried adding required="true" as an attribute of the field and now I also tried adding "required" to the class attribute as you proposed. Unfortunately none of these are triggering my custom event handler in case I enter something, then delete it and finally leave the field. What they do is highlighting the field caption with red, but what I want is to display a custom error message. Thanks for the other suggestion, I will take a look as soon as I fixed the problem of my custom event handler not being called. Commented Jan 28, 2019 at 12:16
  • Okay, that's all I got. I don't have something to test with. This was just shooting from the hip from my mobile. Keep engaging with Zollie, I feel like he might be able to see you through. Commented Jan 28, 2019 at 12:19