A validation summary collects error messages from multiple form controls and displays them together, helping users resolve invalid data after submitting a complex form. section 13.4.3
Build the summary by:
- Tracking whether the form has been submitted and showing the summary only when submitted data is invalid. section 13.4.3
- Reading the NgForm controls object, which exposes the individual controls and their validation errors. section 13.4.3
- Enumerating control names with Object.keys, generating messages for each control, and rendering them with an Angular *ngFor loop. section 13.4.3
Overall form summary
Place a warning container at the top of the form and iterate over getFormValidationMessages(form) to list every unresolved validation message. Keep field-level messages as well, so users can see both the overall problem list and the precise control requiring attention. section 13.4.3
