如何使用Tailwind CSS在React中实现滚动时的元素显示

如何使用Tailwind CSS在React中实现滚动时的元素显示

在本文中,我们将看到如何使用Tailwind CSS在React中实现滚动时的元素显示。滚动时的元素显示是一种技术,当用户向下滚动时,页面上的元素逐渐出现或动画。

创建React应用并安装模块的步骤:

步骤1: 使用以下命令创建React应用:

npm create-react-app appname  

步骤2: 在创建您的项目文件夹(即文件夹名称)之后,使用以下命令进入它:

cd foldername  

步骤3: 创建React.js应用程序后,使用以下命令安装Tailwind CSS

npm install -D tailwindcss postcss autoprefixer  
npx tailwindcss init -p  

步骤4: 将Tailwind CSS指令添加到项目的 index.css 文件中。

@tailwind base;  
@tailwind components;  
@tailwind utilities;  

步骤5 : 使用以下命令在 tailwind.config.js 文件中配置模板路径:

module.exports = {  
    content: [  
        "./src/**/*.{js,jsx,ts,tsx}",  
    ],  
}  

项目结构

如何使用Tailwind CSS在React中实现滚动时的元素显示

方法1:使用Intersection Observer API

在React中使用Tailwind CSS实现滚动时的显示效果,可以通过使用Intersection Observer API来实现。它允许你异步地观察目标元素与其容器或视口的交叉区域的变化。

示例:

import React, { useEffect, useRef, useState } from "react"; 
  
const RevealOnScroll = ({ children }) => { 
    const [isVisible, setIsVisible] = useState(false); 
    const ref = useRef(null); 
  
    useEffect(() => { 
        const scrollObserver = new IntersectionObserver(([entry]) => { 
            if (entry.isIntersecting) { 
                setIsVisible(true); 
                scrollObserver.unobserve(entry.target); 
            } 
        }); 
  
        scrollObserver.observe(ref.current); 
  
        return () => { 
            if (ref.current) { 
                scrollObserver.unobserve(ref.current); 
            } 
        }; 
    }, []); 
  
    const classes = `transition-opacity duration-1000  
        ${isVisible ? "opacity-100" : "opacity-0"
        }`; 
  
    return ( 
        <div ref={ref} className={classes}> 
            {children} 
        </div> 
    ); 
}; 
  
const App = () => { 
    return ( 
        <div className="container mx-auto text-center"> 
            <h1 className="text-7xl font-bold mb-8 text-green"> 
                GeeksforGeeks 
            </h1> 
            <h2 className="text-4xl "> 
                Reveal on Scroll in React using Tailwind CSS 
            </h2> 
            <RevealOnScroll> 
                <p className="text-3xl h-[15em] mt-[10em]"> 
                    Welcome to the computer science portal! 
                </p> 
            </RevealOnScroll> 
            <RevealOnScroll> 
                <p className="text-3xl h-[15em] mt-[10em]"> 
                    Learn Web Development 
                </p> 
            </RevealOnScroll> 
            <RevealOnScroll> 
                <p className="text-3xl h-[15em] mt-[10em]"> 
                    Learn Android Development 
                </p> 
            </RevealOnScroll> 
            <RevealOnScroll> 
                <p className="text-3xl h-[15em] mt-[10em]"> 
                    Learn Data Stuctures and Algorithms 
                </p> 
            </RevealOnScroll> 
            <RevealOnScroll> 
                <p className="text-3xl h-[15em] mt-[10em]"> 
                    and more... 
                </p> 
            </RevealOnScroll> 
            {/* Add more RevealOnScroll components  
            for other elements */} 
        </div> 
    ); 
}; 
  
export default App;

输出:

如何使用Tailwind CSS在React中实现滚动时的元素显示

方法2:滚动事件监听器

滚动事件监听器用于在React中使用Tailwind CSS实现滚动时显示效果。它涉及将事件监听器附加到窗口对象或任何可滚动的元素的滚动事件上。当用户滚动时,事件监听器被触发并触发相关的回调函数。

示例:

import React, { useEffect, useRef, useState } from "react"; 
  
const RevealOnScroll = ({ children }) => { 
    const [isVisible, setIsVisible] = useState(false); 
    const ref = useRef(null); 
  
    useEffect(() => { 
        const onWindScroll = () => { 
            const element = ref.current; 
            if (element) { 
                const { top } = element.getBoundingClientRect(); 
                const isVisible = top < window.innerHeight; 
                setIsVisible(isVisible); 
            } 
        }; 
  
        window.addEventListener("scroll", onWindScroll); 
        return () => { 
            window.removeEventListener("scroll", onWindScroll); 
        }; 
    }, []); 
  
    const classes = `transition-opacity duration-1000 
        ${isVisible ? "opacity-100" : "opacity-0"
        }`; 
  
    return ( 
        <div ref={ref} className={classes}> 
            {children} 
        </div> 
    ); 
}; 
  
const App = () => { 
    return ( 
        <div className="container mx-auto text-center"> 
            <h1 className="text-7xl font-bold mb-8 text-green"> 
                GeeksforGeeks 
            </h1> 
            <h2 className="text-4xl "> 
                Reveal on Scroll in React using Tailwind CSS 
            </h2> 
            <RevealOnScroll> 
                <p className="text-3xl h-[15em] mt-[10em]"> 
                    Welcome to the computer science portal! 
                </p> 
            </RevealOnScroll> 
            <RevealOnScroll> 
                <p className="text-3xl h-[15em] mt-[10em]"> 
                    Learn Web Development 
                </p> 
            </RevealOnScroll> 
            <RevealOnScroll> 
                <p className="text-3xl h-[15em] mt-[10em]"> 
                    Learn Android Development 
                </p> 
            </RevealOnScroll> 
            <RevealOnScroll> 
                <p className="text-3xl h-[15em] mt-[10em]"> 
                    Learn Data Stuctures and Algorithms 
                </p> 
            </RevealOnScroll> 
            <RevealOnScroll> 
                <p className="text-3xl h-[15em] mt-[10em]"> 
                    and more... 
                </p> 
            </RevealOnScroll> 
        </div> 
    ); 
}; 
  
export default App;

输出:

如何使用Tailwind CSS在React中实现滚动时的元素显示

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