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Been looking for hours. At https://stackoverflow.com/questions/ask how does the “Tags” section make the blue boxes appear below?
I don’t think they are using keyup event trigger, since the blue boxes are not being updated on every keypress.
You can test this by going to https://stackoverflow.com/questions/ask and typing:
“aadfadasdfasdfasdfasdfasfasdfsaf“
As you type, you will notice that the blue box “aadfadasdfasdfasdfasdfasfasdfsaf” will only appear a few seconds AFTER typing. Not during.
They probably call
setTimeoutandclearTimeoutto run their code 1 second after the lastkeyupevent.