Paste event ignores preventDefault

[Gudahtt]

• @testing-library/user-event version: 14.0.0-beta.11

• Testing Framework and version: jest@26.6.3
• DOM Environment: jsdom@11.5.1

What you did:

I used the new userEvent.paste API to test a form in my application. This form intercepts paste events to split contents among numerous fields, so it is critical that it prevents the clipboard contents from being inserted into the focused input field.

What happened:

During the test, the clipboard contents were all inserted into the focused input element. Calling event.preventDefault in the onPaste handler had no effect.

Reproduction repository:

I would be happy to create a reproduction repository if that would be useful, but I saw a similar unit test here in this repository that I might be able to copy as a simpler representation of the problem. I will pursue that first instead.

Problem description:

When using the new userEvent.paste API with the focus on an editable element, calling event.preventDefault in the onPaste handler has no effect. There is no way to prevent the clipboard contents from being inserted into the editable context.

Suggested solution:

As is already the case for other APIs in this library such as upload, the default behavior of the paste event should be skipped if preventDefault is called on the event.

It looks like a similar problem with the upload API was recently fixed in this PR: #847
I am hoping this problem is able to be fixed in a similar manner.

[Gudahtt]

This unit test demonstrates the problem: https://github.com/testing-library/user-event/pull/862/files#diff-d02dcd473de0e9757eaaea55926d26a5083d26f05e9728c42b2b1afbd5428ee1R68

It failed before the changes in that PR were made, but now passes on that branch.

[github-actions]

🎉 This issue has been resolved in version 14.0.0-beta.12 🎉

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

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