Allow numbers only in one input

Hello everyone!. I have been using DHTMLX for some time, and I have encountered a problem.
I can not make an input only accept numbers, that does not allow to enter any other character.
Could someone give me some help or idea, please?.
From already thank you very much.

Excuse me with my English. I am from Argentina.

There is no way to block a user input
You can enable input validation and at least mark the incorrect values … tionevents

ValidInteger or ValidNumber can be used in your case.

Thank you very much.