"handling event changes" Code Answer's
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handling event changes
Hilarious Hamster
on Aug 04, 2020
<p>This page turns violet when you hold the V key.</p>
<script>
window.addEventListener("keydown", event => {
if (event.key == "v") {
document.body.style.background = "violet";
}
});
window.addEventListener("keyup", event => {
if (event.key == "v") {
document.body.style.background = "";
}
});
</script>Source: eloquentjavascript.net
handling event changes
Hilarious Hamster
on Aug 04, 2020
<button>Click me any way you want</button>
<script>
let button = document.querySelector("button");
button.addEventListener("mousedown", event => {
if (event.button == 0) {
console.log("Left button");
} else if (event.button == 1) {
console.log("Middle button");
} else if (event.button == 2) {
console.log("Right button");
}
});
</script>Source: eloquentjavascript.net
handling event changes
Hilarious Hamster
on Aug 04, 2020
<button>Act-once button</button>
<script>
let button = document.querySelector("button");
function once() {
console.log("Done.");
button.removeEventListener("click", once);
}
button.addEventListener("click", once);
</script>Source: eloquentjavascript.net
handling event changes
Hilarious Hamster
on Aug 04, 2020
<a href="https://developer.mozilla.org/">MDN</a>
<script>
let link = document.querySelector("a");
link.addEventListener("click", event => {
console.log("Nope.");
event.preventDefault();
});
</script>Source: eloquentjavascript.net
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