How to make a custom error message for form field?

Good morning!

I've found error messages which display near the form field if the corresponding attribute is marked as required. But it works for filling only and what if I would like to check this attribute to be a valid string? For example I can check an e-mail to be of xx@xx.xx format.

How can I output a custom error message in the way as it is on the attached picture?

Attached Files

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Hi, Lies, you need to use UserMessage object. Here is an example from Syntax Assistant:

&AtClient
Procedure ActionWithObject(DataObject)
    ...
    Message = New UserMessage();
    Message.Text = "In line 11 of tabular section ""Item"""
             +MissingCount+" "+ItemsUnit + " is missing.";
    Message.Field = "Items[10].Count";
    Message.SetData(DataObject);
    Message.Message();

EndProcedure

Thanks, Timofey!

You're very welcome, Lies.
See ShowErrorMessage procedure in StandardSubsystemsClient module of 1C:Subsystems Library usage for additional example.