How to set the limit in a integer field value

Hi All,

I have a question how to put the limit on any integer field. Like in a field we only put the integer value but I also want to specify that field like user can only enter min 5 digit or max 7 digit numeric value. I have already written the On-change catalog client script for only entering the integer value but also want to limit the number of digits.

Request you to please help or guide.

Thanks/Utkarsh