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How to detect Ctrl + A press in a keyup event with JavaScript?

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Sometimes, we want to detect Ctrl + A press in a keyup event with JavaScript.

In this article, we’ll look at how to detect Ctrl + A press in a keyup event with JavaScript.

How to detect Ctrl + A press in a keyup event with JavaScript?

To detect Ctrl + A press in a keyup event with JavaScript, we can set the document.onkeyup property to a function that checks for the pressing ctrl+a key combo.

For instance, we write:

document.onkeyup = (e) => {
  if (e.ctrlKey && (e.keyCode == 65 || e.keyCode == 97)) {
    console.log('ctrl+a pressed')
  }
}

We set document.onkeyup to a function that checks if ctrl is pressed with e.ctrlKey.

And we check if the ‘a’ key is pressed with (e.keyCode == 65 || e.keyCode == 97).

If they’re both true, then we know ctrl+a is pressed.

Conclusion

To detect Ctrl + A press in a keyup event with JavaScript, we can set the document.onkeyup property to a function that checks for the pressing ctrl+a key combo.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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