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Comments on Why does a keydown event is listened only once?

Post

Why does a keydown event is listened only once?

+1
−1

The following code (credit for user:hkotsubo) moves the user to another page if Alt+Shift+E are pressed together.

window.addEventListener('DOMContentLoaded', () => {
  let domain = window.location.host;
  let protocol = window.location.protocol;
  let h1 = document.querySelector("h1");

  window.addEventListener('keydown', function(event) {
      if (event.altKey && event.shiftKey && event.key === 'E') {
          window.location.href = `${protocol}//${domain}/index.php?title=${h1.innerText}&action=edit`;
      }
  });
});

I have the problem that the code can only run once.
Even if I run it from a user script manager so it's always in the background, still, I can use it to move a user to the edit page only once per page load, so if I want to use it again I have to refresh the page.

Why is this problem happening and how would you suggest to solve it?

javascript keyboard-events
posted almost 2 years ago
deleted user
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1 comment thread

How would it run multiple times? (5 comments)
How would it run multiple times?
Peter Taylor‭ wrote almost 2 years ago
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I'm having trouble understanding what the problem is. The code navigates away from the page, so how could it possibly be triggered twice?

deleted user wrote almost 2 years ago · edited almost 2 years ago
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Hello Peter.

I am sorry, I don't understand what you mean by "navigates away from the page".

I just want to listen the event all the time I use the webpage in which this code is being run (by a user script manager).

Skipping 2 deleted comments.

Peter Taylor‭ wrote almost 2 years ago
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Setting the value of window.location.href navigates to the provided URL. Doesn't that mean that you're now on a different page, so there is no opportunity to trigger the same handler twice?

elgonzo‭ wrote almost 2 years ago · edited almost 2 years ago
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What is the match pattern you are using in your userscript manager to load your script?

Note that the match pattern has to match whatever URL ${protocol}//${domain}/index.php?title=${h1.innerText}&action=edit evaluates to. Otherwise, when your browser navigates to this URL (which is effectively a page load), the userscript manager won't apply the script. (Also pay attention to any URL redirection, whether it being HTTP redirects or some javascript in the page doing a redirection / loading of a page with a different URL. The target URL of a redirect would also need to be matched by your userscript's match pattern so that your the userscript manager will apply the script.)

deleted user wrote almost 2 years ago
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Peter Taylor‭ indeed but I think I had a case were the script opened a new tab and then I had to refresh the page to use it but I can't reproduce, so it's some strange situation in the middle of the work which no longer happens.

@elgonzo the match pattern is https://example.com/* but the problem no longer occurs.

This thread may better be locked (if comments stay in place and don't get auto deleted), or otherwise deleted.