如何在 Gatsby 的标题中添加滚动事件
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【中文标题】如何在 Gatsby 的标题中添加滚动事件【英文标题】：How to add a scroll event to a header in Gatsby 【发布时间】：2021-05-11 16:17:31 【问题描述】：-
总结问题
-
描述您的尝试
-
显示一些代码
- 这是我的 Header 组件（使用 tailwindcss）：
import React from 'react';
import '../styles/global.css';
import Link from 'gatsby';
const Header = () =>
return (
<header className="z-10 bg-transparent fixed w-full h-100px transition-all duration-300 ease-in delay-0 block box-border">
<div className="bg-transparent transition duration-75 ease-in shadow-none block box-border">
<div className="container relative px-15px mx-auto max-w-screen-xl block box-border">
<div className="w-full float-left relative block box-border capitalize tracking-wide antialiased">
<Link to="/" className="w-3/12 transition-colors duration-300 ease-linear delay-0 float-left mt-8 ml-12">
<svg className="md:hidden w-full h-auto" viewBox="0 0 180 40" xmlns="http://www.w3.org/2000/svg">
<g fillRule="nonzero" fill="#f4c5d2">
<path
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</g>
</svg>
</Link>
<ul className="h-90px max-h-400px mt-8 mr-12 p-0 list-none float-right block">
<li className="float-left ml-0.5 list-none px-2">
<Link
to="/services/"
className="text-white hover:text-pink-200 uppercase text-lg leading-100 py-0 px-12px inline-block no-underline transition-all duration-300 ease-in delay-0"
style=fontFamily: 'EB Garamond, serif'
>
Services
</Link>
</li>
<li className="float-left ml-0.5 list-none px-2">
<Link
to="/about/"
className="text-white hover:text-pink-200 uppercase text-lg leading-100 py-0 px-12px inline-block no-underline transition-all duration-300 ease-in delay-0"
style=fontFamily: 'EB Garamond, serif'
>
About Us
</Link>
</li>
<li className="float-left ml-0.5 list-none px-2">
<Link
to="/news/"
className="text-white hover:text-pink-200 uppercase text-lg leading-100 py-0 px-12px inline-block no-underline transition-all duration-300 ease-in delay-0"
style=fontFamily: 'EB Garamond, serif'
>
News
</Link>
</li>
<li className="float-left ml-0.5 list-none px-2">
<Link
to="/contact/"
className="text-white hover:text-pink-200 uppercase text-lg leading-100 py-0 px-12px inline-block no-underline transition-all duration-300 ease-in delay-0"
style=fontFamily: 'EB Garamond, serif'
>
Contact
</Link>
</li>
</ul>
</div>
</div>
</div>
</header>
);
export default Header;
-这里是 Layout.js
import React from 'react';
import Header from './Header';
// import TestHeader from './TestHeader';
// import Navbar from './Navbar';
import Footer from './Footer';
const Layout = ( children ) =>
return (
<>
<Header />
children
<Footer />
</>
);
export default Layout;
-这里是 gatsby-browser.js
import React from 'react';
import Layout from './src/components/Layout';
import './src/styles/global.css';
export function wrapPageElement( element, props )
return <Layout ...props>element</Layout>;
【问题讨论】：
【参考方案1】：最简单的方法是创建一个自定义挂钩来跟踪当前滚动位置。像这样的：
import useLayoutEffect, useRef from 'react';
const isBrowser = typeof window !== `undefined`;
const getScrollPosition = ( element, useWindow ) =>
if (!isBrowser) return x: 0, y: 0 ;
const target = element ? element.current : document.body,
position = target.getBoundingClientRect();
return useWindow
? x: window.scrollX, y: window.scrollY
: x: position.left, y: position.top ;
;
export const useScrollPosition = (effect, deps, element, useWindow, wait) =>
const position = useRef(getScrollPosition( useWindow ));
let throttleTimeout = null;
const callBack = () =>
const currentPosition = getScrollPosition( element, useWindow );
effect( previousPosition: position.current, currentPosition: currentPosition );
position.current = currentPosition;
throttleTimeout = null;
;
useLayoutEffect(() =>
const handleScroll = () =>
if (wait && !throttleTimeout) throttleTimeout = setTimeout(callBack, wait);
else callBack();
;
window.addEventListener(`scroll`, handleScroll);
return () => window.removeEventListener(`scroll`, handleScroll);
, deps);
;
随意命名，我在这个例子中使用了useScrollPosition.js。
然后，将其导入所需的文件：
import React from 'react';
import '../styles/global.css';
import Link from 'gatsby';
const Header = () =>
const [scroll, setScroll] = useState(0);
useScrollPosition(function setScrollPosition ( currentPosition )
setScroll(currentPosition.y);
);
return (
<header className=`z-10 bg-transparent fixed w-full h-100px transition-all duration-300 ease-in delay-0 block box-border $scroll > 150 ? 'someClass' :'' `>
<div className="bg-transparent transition duration-75 ease-in shadow-none block box-border">
<div className="container relative px-15px mx-auto max-w-screen-xl block box-border">
<div className="w-full float-left relative block box-border capitalize tracking-wide antialiased">
<Link to="/" className="w-3/12 transition-colors duration-300 ease-linear delay-0 float-left mt-8 ml-12">
<svg className="md:hidden w-full h-auto" viewBox="0 0 180 40" xmlns="http://www.w3.org/2000/svg">
<g fillRule="nonzero" fill="#f4c5d2">
<path
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</g>
</svg>
</Link>
<ul className="h-90px max-h-400px mt-8 mr-12 p-0 list-none float-right block">
<li className="float-left ml-0.5 list-none px-2">
<Link
to="/services/"
className="text-white hover:text-pink-200 uppercase text-lg leading-100 py-0 px-12px inline-block no-underline transition-all duration-300 ease-in delay-0"
style=fontFamily: 'EB Garamond, serif'
>
Services
</Link>
</li>
<li className="float-left ml-0.5 list-none px-2">
<Link
to="/about/"
className="text-white hover:text-pink-200 uppercase text-lg leading-100 py-0 px-12px inline-block no-underline transition-all duration-300 ease-in delay-0"
style=fontFamily: 'EB Garamond, serif'
>
About Us
</Link>
</li>
<li className="float-left ml-0.5 list-none px-2">
<Link
to="/news/"
className="text-white hover:text-pink-200 uppercase text-lg leading-100 py-0 px-12px inline-block no-underline transition-all duration-300 ease-in delay-0"
style=fontFamily: 'EB Garamond, serif'
>
News
</Link>
</li>
<li className="float-left ml-0.5 list-none px-2">
<Link
to="/contact/"
className="text-white hover:text-pink-200 uppercase text-lg leading-100 py-0 px-12px inline-block no-underline transition-all duration-300 ease-in delay-0"
style=fontFamily: 'EB Garamond, serif'
>
Contact
</Link>
</li>
</ul>
</div>
</div>
</div>
</header>
);
export default Header;
注意：为了清理你的代码，为了内联 SVG 资产，我强烈推荐：Import SVG as a component in Gatsby
思路很简单，前面的钩子计算滚动位置并在你的<Header>组件中触发效果，将当前滚动位置保持在状态（[scroll, setScroll]）。此时，您只需要使用模板文字（$scroll > 150 ? 'someClass' : ''）根据滚动的值更改<header>类名即可。
【讨论】：
我导入了 useState ，你的 useScrollPosition 钩子，并添加了模板文字。我不知道为什么，但在页面上滚动后没有任何变化。它似乎没有工作。也没有错误，但控制台确实记录了这一点：'30:55 警告从 React Hook useLayoutEffect 内部对'throttleTimeout'变量的分配将在每次渲染后丢失。要随着时间的推移保留该值，请将其存储在 useRef Hook 中，并将可变值保留在 '.current' 属性中。否则，你可以直接在 useLayoutEffect react-hooks/exhaustive-deps' 中移动这个变量 添加滚动值的控制台日志，检查是否正确提示 它只返回0，初始状态。
我从我的 css 中删除了 html, body width: 100%; height: 100%; margin: 0; padding: 0; overflow-x: hidden; ，它现在可以工作了。谢谢！以上是关于如何在 Gatsby 的标题中添加滚动事件的主要内容，如果未能解决你的问题，请参考以下文章