Validation Enhancer Demo

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A web component that upgrades native HTML5 form validation with inline errors, CSS state classes, ARIA support, and optional Zod schema integration.

Native Constraint Validation

Try submitting the form empty, then correct each field. Messages appear beside the matching field and clear as soon as the value passes validation.

  • Required fields
  • Email and URL formats
  • Pattern and length rules
  • Range and step checks
Optional

Custom Options

This form uses custom success and error classes, a custom message prefix, assertive live regions, and aria-describedby as the message target.

Custom Validity and Custom Controls

Password confirmation uses setCustomValidity(). The rating field is a form-associated custom element that participates in the same validation flow.

Rating

Dynamic Fields and Scroll Container

Add a required field after the component has loaded, then submit. The new field is registered automatically and the scroll container moves to the first invalid item.

Scroll area

Zod Schema Validation

The schema controls the error messages for named fields while the same inline display and focus behavior stays in place.

Plan