Show validation errors

[fredden]

Description

When using the "try it out" feature, the request is validated locally before being sent to the server. If the request fails validation, nothing happens. (The request is not sent.)

This pull request adds display of the validation errors so that the user can see why the request was not sent, and has an opportunity to resolve the problem(s) identified.

Motivation and Context

This fixes #6295

How Has This Been Tested?

I have used the test case given in #6295.

Screenshots

Checklist

My PR contains...

• No code changes (src/ is unmodified: changes to documentation, CI, metadata, etc.)
• Dependency changes (any modification to dependencies in package.json)
• Bug fixes (non-breaking change which fixes an issue)
• Improvements (misc. changes to existing features)
• Features (non-breaking change which adds functionality)

My changes...

• are breaking changes to a public API (config options, System API, major UI change, etc).
• are breaking changes to a private API (Redux, component props, utility functions, etc.).
• are breaking changes to a developer API (npm script behavior changes, new dev system dependencies, etc).
• are not breaking changes.

Documentation

• My changes do not require a change to the project documentation.
• My changes require a change to the project documentation.
• If yes to above: I have updated the documentation accordingly.

Automated tests

• My changes can not or do not need to be tested.
• My changes can and should be tested by unit and/or integration tests.
• If yes to above: I have added tests to cover my changes.
• If yes to above: I have taken care to cover edge cases in my tests.
• All new and existing tests passed.

[tim-lai]

@fredden Thanks for the PR! Looks good to me. Although just need to fix the lint errors in the test before approval/merge. Refer to CI check or below:

/home/runner/work/swagger-ui/swagger-ui/test/e2e-cypress/tests/features/multiple-examples-core.js
Error:   619:17  error  Strings must use doublequote  quotes

[fredden]

Thanks @tim-lai. I've made that change and rebased the pull request onto the latest changes in master. Please can you check again?

[tim-lai]

Thanks @tim-lai. I've made that change and rebased the pull request onto the latest changes in master. Please can you check again?

Done. PR merged. Thanks for the contribution!