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export function setTimeoutOnVisible({
element,
callback,
timeout,
threshold = 0.01,
}: {
element?: HTMLElement;
callback: () => void;
timeout: number;
threshold?: number;
}) {
if (!element) {
return;
}
let timeoutId: NodeJS.Timeout | null = null;
let finished = false;
// Check if element is already visible at the beginning
const rect = element.getBoundingClientRect();
const isVisible = rect.top < window.innerHeight && rect.bottom > 0;
const setupTimeout = () => {
if (finished) return;
timeoutId = setTimeout(() => {
if (finished) return;
callback();
timeoutId = null;
finished = true;
}, timeout);
};
if (isVisible && !timeoutId) setupTimeout();
const observer = new IntersectionObserver(
(entries) => {
entries.forEach((entry) => {
if (entry.isIntersecting) {
// Element is visible, start the timeout
if (!timeoutId) {
setupTimeout();
observer.disconnect();
}
} else {
// Element is no longer visible, clear the timeout
if (timeoutId) {
clearTimeout(timeoutId);
timeoutId = null;
}
}
});
},
{ threshold },
);
observer.observe(element);
// Return a cleanup function
return () => {
if (timeoutId) {
clearTimeout(timeoutId);
}
observer.disconnect();
};
}
export function setIntervalOnVisible({
element,
callback,
interval,
threshold = 0.01,
}: {
element?: HTMLElement | null;
callback: () => void;
interval: number;
threshold?: number;
}) {
if (!element) {
return;
}
let intervalId: NodeJS.Timeout | null = null;
// Check if element is already visible at the beginning
const rect = element.getBoundingClientRect();
const isVisible = rect.top < window.innerHeight && rect.bottom > 0;
const setupInterval = () => {
if (!intervalId) {
intervalId = setInterval(callback, interval);
}
};
const clearIntervalIfExists = () => {
if (intervalId) {
clearInterval(intervalId);
intervalId = null;
}
};
if (isVisible) setupInterval();
const observer = new IntersectionObserver(
(entries) => {
entries.forEach((entry) => {
if (entry.isIntersecting) {
// Element is visible, start the interval
setupInterval();
} else {
// Element is no longer visible, clear the interval
clearIntervalIfExists();
}
});
},
{ threshold },
);
observer.observe(element);
// Return a cleanup function
return () => {
clearIntervalIfExists();
observer.disconnect();
};
}
export default setTimeoutOnVisible;
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