How to represent native HTML5 form validation in a UML Sequence Diagram?

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Context summary

We are modeling a Sequence Diagram for a React application (Next.js). The flow describes the creation of a new staff member through a form located in the AddStaff.tsx component.

The Actor: The User enters the data. The Container: A Page (AdminPage.tsx) mounts the component, passing props (e.g., targetRole). The Logic: The component uses native HTML5 validation (required, minLength) and a JavaScript funcResolution of the two Doubts

The core issue is how to represent the "Stop" moment if the data is invalid. Here is the correct technical distinction:

A. Using a NOTE (Recommended for HTML5) Since required and minLength are declarative HTML attributes and not a manual function call in your script, a Note is the most accurate representation. Placement: The Note should be placed over the Component lifeline immediately after the User's click. Logic: It signals that the Browser acts as a filter. If the criteria are not met, the sequence stops. This avoids drawing "fake" function calls that don't exist in your actual TypeScript code.

B. Using a SELF-MESSAGE (Recursive Arrow) This is used if you want to emphasize the validation as an active logical step of the component. Placement: A looping arrow that starts and ends on the AddStaff.tsx lifeline, labeled "validate()" or "checkValidity()". Logic: Use this approach only if you have a custom JavaScript validation function. If you rely solely on HTML5, this might be technically "less precise" but is often used in academic UML to show that a check is happening.

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