According to Mozilla docs, reading is not possible within the copy event. As for why it's disabled, I think the content is written to the clipboard AFTER the event is finished, because in order to change the clipboard data you need to cancel the events default action. So if you could read within the copy event, you would be able to read the old clipboard data, which is a security issue. I don't have any sources that confirm this however.
There is a way for websites to read the clipboard, which involves using the navigator. But if a website tries to do this, you will get a popup asking you for permission.
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Yes,
oncopyis the HTML equivalent.Reading is only possible within a
pasteevent.Is it possible in a copy event, or no?
If so, do you know why they made the decision to leave out reading from copying events?
According to Mozilla docs, reading is not possible within the copy event. As for why it's disabled, I think the content is written to the clipboard AFTER the event is finished, because in order to change the clipboard data you need to cancel the events default action. So if you could read within the copy event, you would be able to read the old clipboard data, which is a security issue. I don't have any sources that confirm this however.
There is a way for websites to read the clipboard, which involves using the navigator. But if a website tries to do this, you will get a popup asking you for permission.