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1. JavaScriptãšIntersectionObserver APIã䜿çšãã
IntersectionObserver APIã䜿çšãããšãèŠçŽ ããã¥ãŒããŒãã«åºå
¥ãããã¿ã€ãã³ã°ãç£èŠã§ããŸãããã®APIã䜿çšããŠãããŒãžã®ç¹å®ã®ã»ã¯ã·ã§ã³ã衚瀺ãããããšãæ€åºãã察å¿ããã¢ãã¡ãŒã·ã§ã³ã€ãã³ããããªã¬ãŒã§ããŸãã
以äžã«åºæ¬çãªäŸã瀺ããŸãïŒ
// Define the event markers (sections of the page)
const sections = document.querySelectorAll('.scroll-section');
// Create an IntersectionObserver
const observer = new IntersectionObserver(entries => {
entries.forEach(entry => {
if (entry.isIntersecting) {
// Trigger the event for the intersecting section
const sectionId = entry.target.id;
console.log(`Section ${sectionId} is now visible`);
// Perform actions based on the section ID (e.g., start an animation)
}
});
}, {
threshold: 0.5 // Trigger when 50% of the section is visible
});
// Observe each section
sections.forEach(section => {
observer.observe(section);
});
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2. JavaScriptãšã¹ã¯ããŒã«ã€ãã³ããªã¹ããŒã䜿çšãã
å¥ã®ã¢ãããŒãã¯ãã¹ã¯ããŒã«ã€ãã³ããçŽæ¥ãªãã¹ã³ããã¹ã¯ããŒã«ã®é²è¡ç¶æ³ãèšç®ããããšã§ãããã®åŸãã¹ã¯ããŒã«ã®é²è¡ç¶æ³ã䜿çšããŠãã©ã®ã€ãã³ãããŒã«ãŒã«å°éãããã倿ãã察å¿ããã¢ã¯ã·ã§ã³ãããªã¬ãŒã§ããŸãã
以äžã«äŸã瀺ããŸãïŒ
// Get the scrollable element (e.g., the document body)
const scrollableElement = document.documentElement || document.body;
// Define the event markers (scroll positions)
const eventMarkers = {
'25%': 0.25,
'50%': 0.5,
'75%': 0.75
};
// Function to trigger events based on scroll progress
function handleScroll() {
const scrollHeight = scrollableElement.scrollHeight - scrollableElement.clientHeight;
const scrollProgress = scrollableElement.scrollTop / scrollHeight;
for (const eventName in eventMarkers) {
const eventThreshold = eventMarkers[eventName];
if (scrollProgress >= eventThreshold) {
// Trigger the event
console.log(`Event ${eventName} triggered`);
// Perform actions based on the event name
// Optional: Remove the event marker to prevent it from being triggered again
delete eventMarkers[eventName];
}
}
}
// Listen for scroll events
window.addEventListener('scroll', handleScroll);
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