Notes![what is notes.io? What is notes.io?](/theme/images/whatisnotesio.png)
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseFloat // parse float
https://developer.mozilla.org/en-US/docs/Web/API/Event/preventDefault // prevent default method
https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener // addEventListener method
https://developer.mozilla.org/en-US/docs/Web/API/setInterval // set interval function method
https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent // keyboard event
https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key // key property
https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Building_blocks/Events // into to JS events
https://developer.mozilla.org/en-US/docs/Web/API/Element/keydown_event // keydown event
https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/code // keyboardevent : code property
textAreaEl.addEventListener('keydown', function (event) {
// Access value of pressed key with key property
var key = event.key.toLowerCase();
var alphabetNumericCharacters = 'abcdefghijklmnopqrstuvwxyz0123456789 '.split(
''
);
if (alphabetNumericCharacters.includes(key)) {
for (var i = 0; i < elements.length; i++) {
elements[i].textContent += event.key;
}
}
});
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