Field Validation in Zoho Creator is a constraint applied to a form field that enforces data quality rules at the point of submission. When a user submits a form, Creator checks the field value against the configured validation criteria. If the value does not comply, the submission is blocked and an error message is shown to the user explaining what is required.
Creator supports several validation types: required (field cannot be empty), character length limits, numeric range constraints for number fields, date range constraints for date fields, regular expression patterns for format checks, and uniqueness checks that prevent duplicate values across all records in the form. Multiple validation rules can be stacked on a single field.
For validation logic that cannot be expressed through the built-in rule types, developers can write custom validation scripts in Deluge within the form’s On Validate handler. This allows cross-field validation, checks against data in other forms, or API calls to verify values against an external system before allowing the record to be saved. Custom validation provides the flexibility to enforce any business rule, however complex.
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