scroll2078

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navigation bar behavior based on scroll bar

当前为 2024-04-01 提交的版本，查看最新版本。

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.icu/scripts/491240/1352570/scroll2078.js

换行

document.addEventListener('DOMContentLoaded', function () {
    const header = document.querySelector('.header');
    let lastScrollTop = 0;

    header.style.transform = 'translateY(-20px)';

    function handleScroll() {
        let scrollTop = window.pageYOffset || document.documentElement.scrollTop;
        let delta = scrollTop - lastScrollTop;

        if (delta > 0) {
            header.style.transform = 'translateY(-20px)';
        } else if (scrollTop <= 20) {
            let translateYValue = Math.max(-20, -20 + (20 - scrollTop));
            header.style.transform = `translateY(${translateYValue}px)`;
        } else {
            header.style.transform = 'translateY(0px)';
        }

        lastScrollTop = scrollTop;
    }

    window.addEventListener('scroll', handleScroll);
});