Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
2.9k views
in Technique[技术] by (71.8m points)

reactjs - Simulate keydown on document for JEST unit testing

Using JEST to unit test a component that has a keydown listener attached to the document.

How can I test this in JEST? How do I simulate the keydown event on the document? I need the event listener to be on the document since it is supposed to respond the keyboard action irrespective of the focussed element.

EDIT: The question here is about simulating the event on the document or the document.body. All the examples are regarding an actual DOM node, that works fine but the document does not.

Currently trying to do this:

TestUtils.Simulate.keyDown(document, {keyCode : 37}); // handler not invoked
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

I had the exact same problem and unfortunately couldn't find any details on how to solve this using TestUtils.Simulate. However this issue gave me the idea of simply calling .dispatchEvent with a KeyboardEvent inside my jest tests directly:

var event = new KeyboardEvent('keydown', {'keyCode': 37});
document.dispatchEvent(event);

You can find details on the KeyboardEvent here: https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/KeyboardEvent


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

2.1m questions

2.1m answers

60 comments

57.0k users

...