I'm experimenting with incrementing a variable based on whether someone scrolls down or up the page.
The event triggers each time you scroll in either direction, but the value only increases by one. Can anyone suggest a reason for this behavior?
window.addEventListener("wheel", function (e) {
const y = e.deltaY;
let scrollIndex = 0;
if (y > 0) {
scrollIndex++;
} else {
scrollIndex--;
}
console.log(`Scroll index: ${scrollIndex}`);
});
Each time a new scrollIndex variable is set to zero, it causes the issue. To fix this, move the scrollIndex declaration outside of the function. Here is an example:
let scrollIndex = 0;
window.addEventListener("wheel", function (e) {
const y = e.deltaY;
if (y > 0) {
scrollIndex++;
} else {
scrollIndex--;
}
console.log(`Scroll index: ${scrollIndex}`);
});
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