scroll eventListener在javascript中不起作用

Question

window.addEventListener的滚动事件在我的JS中不起作用。我已经尝试了几种方法，但是仍然无法正常工作。我也已经在JS中使用了sectionObserver。这是JS代码

const moveToAbout = () => {
    document.getElementById('about').scrollIntoView(true)
}

const moveToWork = () => {
    document.getElementById('work').scrollIntoView()
}

const moveToTop = () => {
    document.getElementById('main-section').scrollIntoView(true)
}


const options = {
    root: null,
    threshold: 0,
    rootMargin: "-150px"
}

const header = document.querySelector("header")
const sections = document.querySelectorAll(".section")
const mainSection = document.querySelector(".main-container")

const bttWrapper = document.getElementById('bttBtn-wrapper')
const veganImage = document.getElementById('vegan-store-image')
const navbar = document.getElementById('header')



veganImage.onclick = () => {
    window.open("https://thoughtlessmind.github.io/Vegan-store")
}


const sectionOne = document.querySelector(".about-section");
// bttWrapper.style.display = 'none'

const mainObserver = new IntersectionObserver(function (entries, observer) {
    entries.forEach(entry => {

        if (entry.isIntersecting) {
            header.classList.remove("nav-theme-2")
            bttWrapper.classList.add("btnWrapperHidden")
            bttWrapper.classList.remove("btnWrapperShow")
        } else {
            header.classList.add("nav-theme-2")
            bttWrapper.classList.add("btnWrapperShow")
        }


        // console.log(entry.target, '-', entry.isIntersecting)
    });
}, options);


mainObserver.observe(mainSection)


window.addEventListener("scroll", (event)=>{
    console.log("scrolled")
    var scroll = this.scrollY
    if(scroll > 20){
        console.log('reached')
    }
})

const test = () =>{
    console.log('working')
}

window.addEventListener("scroll", test)

window.addEventListener("scroll", () => console.log(window.pageYOffset));

下半部分，我尝试以某种方式添加滚动事件，但是没有任何反应。这是整个仓库的链接：Github repo link

Answer 1

从CSS main中删除height属性。现在正在工作：

使用min-height, max-height

const moveToAbout = () => {
document.getElementById('about').scrollIntoView(true)
}

const moveToWork = () => {
document.getElementById('work').scrollIntoView()
}

const moveToTop = () => {
document.getElementById('main-section').scrollIntoView(true)
}


const options = {
root: null,
threshold: 0,
rootMargin: "-150px"
}

const header = document.querySelector("header")
const sections = document.querySelectorAll(".section")
const mainSection = document.querySelector(".main-container")

const bttWrapper = document.getElementById('bttBtn-wrapper')
const veganImage = document.getElementById('vegan-store-image')
const navbar = document.getElementById('header')



veganImage.onclick = () => {
window.open("https://thoughtlessmind.github.io/Vegan-store")
}


const sectionOne = document.querySelector(".about-section");
// bttWrapper.style.display = 'none'

const mainObserver = new IntersectionObserver(function(entries, observer) {
entries.forEach(entry => {

    if (entry.isIntersecting) {
        header.classList.remove("nav-theme-2")
        bttWrapper.classList.add("btnWrapperHidden")
        bttWrapper.classList.remove("btnWrapperShow")
    } else {
        header.classList.add("nav-theme-2")
        bttWrapper.classList.add("btnWrapperShow")
    }


    // console.log(entry.target, '-', entry.isIntersecting)
});
}, options);


mainObserver.observe(mainSection)

window.onload = () =>{
console.log("loaded");
window.onscroll = function()
{
  console.log("scrolling.....", window.scrollY);
}
}

@import 'global.css';


/* -----Navigation bar styles */
@import 'navbar.css';



/* ----------- Main contaier styles*/
main{
    overflow: scroll; 
    scroll-snap-type: y mandatory;
}

.section{
    /* scroll-snap-align: start; */
    /* Uncomment above to add snap scrolling effect */
    margin-left: auto;
    margin-right: auto;
    width: 80%;
    max-width: 1100px;
    border-bottom: 1px solid grey;
}

.main-container {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    justify-content: space-between;
}

.name-text{
    font-size: 2.8rem;
    font-weight: 500;
    color: var(--primary-text-color);
}

.intro-text{
    padding: 1rem;
    padding-left: 0;
    font-size: 1.2rem;
    color: var(--para-text-color);
}

.right-container{
    text-align: left;
}

.text-container{
    align-self: center;
}

.left-image{
    width: 200px;
    height: 200px;
    background-color: palegreen;
    animation: rotate 8s infinite ease-in-out ;
}

@keyframes rotate{
    0%{
        border-radius: 0;
    }
    50%{
        border-radius: 50%;
        transform: rotate(145deg);
        background-color: green;
    }
    100%{
        transform: rotate(360deg);
        border-radius: 0;
    }
}



.social-link-container{
    margin-top: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.social-logo{
    font-size: 2rem;
    color: var(--primary-text-color);
}

.social-link{
    margin: 0 10px;
}


/* About section */

.about-section{
    height: 100vh;
    padding-top: 38.5px;
    border-bottom: 1px solid grey;
}

.about-section >  h2{
    padding: 10px 10px 10px 0px;
}


/* ----Work section ---- */

#work{
    height: 100vh;
    padding-top: 38.5px;
}

#work >h2 {
    padding: 10px 10px 10px 0;
}

/* .inverse{
    background-color: #111;
    color: #eee;
} */


.project-card{
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    border-radius: 5px;
    margin-top: 15px;
    transition: 0.3s;
}

.project-card:hover{
    background-color: rgba(200, 200, 200, 0.2);
}

.left-side-card{
    padding-right: 10px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    max-height: 145px;
    height: 145px;
}



.project-name{
    margin-bottom: 10px;
    display: inline-block;
}

.project-link{
    text-decoration: none;
    letter-spacing: 0.8px;
    position: relative;
}

.project-name::after{
    position: absolute;
    bottom: 0;
    left: 0;
    content: '';
    height: 1px;
    width: 100%;
    background-color: black;
    /* transform: scale(1); */
    transition: 0.3s;
    transform-origin: left;
}

.project-name:hover::after{
    transform: scale(0);
    transform-origin: left;
}

.project-description {
    word-spacing: 0.8px;
    letter-spacing: -0.2px;
}

.project-image{
    height: 150px;
    width: 250px;
    cursor: pointer;
    border-radius: 5px;
}

.tech-stack-container{
    display: flex;
}

.tech-stack{
    margin-right: 10px;
    font-size: 12px;
    font-weight: 600;
    color: rgba(198, 198, 198,0.8);
    transition: 0.3s;
}

.project-card:hover .tech-stack{
    color: #6d6d6d
}

.repo-link{
    margin-left: 20px;
}

.repo-logo{
    color: rgba(0, 0, 0, 0.8);
}

.repo-logo:hover{
    color: rgba(0, 0, 0, 0.6);
}








@media only screen and (max-width: 500px){
    nav{
        display: flex;
        align-items: center;
        justify-content: center;
        float: none;
        height: 22px;
    }
    .section{
        width: 90%;
    }
    .main-container{
        flex-direction: column-reverse;
        justify-content: space-evenly;
    }
    .name-text{
        text-align: center;
        font-size: 28px;
    }

    .intro-text{
        font-size: 18px;
    }

    .project-card{
        flex-direction: column;
    }

    #work{
        min-height: fit-content;
        height: fit-content;
    }
}
header {
    position: fixed;
    width: 100%;
    background: rgba(255, 255, 255, 0.8);
    padding: 10px 0;
    z-index: 1;
    transition: all ease-in-out 0.5s;
}

.green-nav {
    background-color: lawngreen;
}

header:after {
    content: "";
    display: block;
    clear: both;
}

nav {
    float: right;
    padding: 0 10%;
}

nav a {
    font-size: 1rem;
    margin: 5px 10px;
    color: #484848;
    text-decoration: none;
    transition: 0.3s;
    padding-bottom: 2px;
    font-weight: 500;
    position: relative;
    padding: 2px 5px;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
}

nav a::after {
    position: absolute;
    bottom: 0;
    left: 0;
    content: '';
    height: 1px;
    width: 100%;
    background-color: #484848;
    transform: scaleX(0);
    transition: 0.5s;
    transform-origin: center;
}


nav a:hover::after {
    transform: scaleX(1);
}

* {
    margin: 0;
    padding: 0;
    scroll-behavior: smooth;
}

:root{
    --primary-text-color: #000;
    --para-text-color: #323232;
}

body {
    font-family: 'Montserrat', sans-serif;
    font-weight: 400;
    /* scrollbar-color: rgba(0, 0, 0, .5);
    scrollbar-track-color: #f1f1f1; */
}

a {
    text-decoration: none;
    color: #000;
}



/*-------- Custom scroll bar and selection -----*/

@media only screen and (min-width: 600px) {
    ::-webkit-scrollbar {
        width: 7px;
    }

    ::-webkit-scrollbar-thumb {
        border-radius: 4px;
        background-color: rgba(0, 0, 0, .5);
        box-shadow: 0 0 1px rgba(255, 255, 255, 0.5);
    }

    ::-webkit-scrollbar-thumb:hover {
        background: rgba(0, 0, 0, .6);
    }

    ::-webkit-scrollbar-track {
        background: #f1f1f1;
    }
}

::selection {
    background-color: rgb(78, 81, 83);
    color: #fff;
}


/* ------- back to top btn */

#bttBtn-wrapper {
    position: absolute;
    bottom: 50px;
    right: 50px;
    background-color: grey;
    border-radius: 50%;
    height: 40px;
    width: 40px;
    cursor: pointer;
}

.btnWrapperHidden {
    transform: scale(0);
    transform-origin: center;
    transition: 300ms;
}

.btnWrapperShow {
    transform: scale(1) rotate(360deg);
    transform-origin: center;
    transition: 300ms;
}

#bttBtn {
    width: 15px;
    height: 15px;
    border-radius: 2dpx;
    border-left: 3px solid;
    border-top: 3px solid;
    transform: rotate(45deg);
    margin: auto;
    margin-top: 11px;
}

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="google-site-verification" content="x2GVvk7gy3nGrRmARofMXwMNs9MIXvu2BcyEs7RH8KQ" />
    <link href="https://fonts.googleapis.com/css?family=Montserrat:400,500,700&display=swap" rel="stylesheet">
    <meta name="Description" content="Name: Rajiv, thoughtlessmind, Profession: Web developer, Country: India, ">
    <script src="https://kit.fontawesome.com/09ef7cae5b.js" crossorigin="anonymous"></script>
    <script defer src="index.js"></script>
    <link rel="stylesheet" href="CSS/style.css">
    <!-- Chrome, Firefox OS and Opera -->
    <meta name="theme-color" content="#4285f4">
    <!-- Windows Phone -->
    <meta name="msapplication-navbutton-color" content="#4285f4">
    <!-- iOS Safari -->
    <meta name="apple-mobile-web-app-status-bar-style" content="#4285f4">
    <title>Rajiv</title>
</head>

<body>
    <div id="top"></div>
    <header>
        <nav>
            <a onclick="moveToWork()">Work</a>
            <a onclick="moveToAbout()">About</a>
            <a onclick="moveToContact()">Contact</a>
        </nav>
    </header>

    <main>
        <div class="main-container section" id="main-section">
            <!-- <img src="" alt="avatar" class="avatar" style="height: 200px;width: 200px; background-color: wheat;align-self: center;"> -->
            <div class="right-container">
                <div class="text-container">
                    <h1 class="name-text">Rajiv</h1>
                    <p class="intro-text">
                        Hey, I'm a web developer based in New Delhi.
                        <br>
                        I build things using <b>Javasript</b>.
                    </p>
                </div>
            </div>

            <div class="left-container">
                <div class="left-image">

                </div>

                <div class="social-link-container">
                    <a href="https://github.com/thoughtlessmind" target="_blank" id="github" class="social-link">
                        <i class="fab fa-github social-logo"></i>
                    </a>
                    <a href="https://www.linkedin.com/in/thoughtlessmind/" target="_blank" id="linkedin"
                        class="social-link">
                        <i class="fab fa-linkedin social-logo"></i>
                        </svg>
                    </a>
                </div>
            </div>
        </div>


        <!-- Work Section -->
        <div id="work" class="work-section section">
            <h2>Work</h2>

            <div class="project-card">
                <div class="left-side-card">
                    <div>
                        <a href="https://thoughtlessmind.github.io/Vegan-store" target="_blank" class="project-link">
                            <h3 class="project-name">
                                Vegan Store
                            </h3>
                        </a>
                        <p class="project-description">
                            It is a dummy vegan food store website. <br>
                            This is a fully responsive website made using CSS Flexbox and Grids
                        </p>
                    </div>
                    <div title="techstack used" class="tech-stack-container">
                        <p class="tech-stack html-logo">HTML</p>
                        <p class="tech-stack css-logo">CSS</p>
                        <a title="open repo" href="" class="repo-link">
                            <i class="fas fa-code repo-logo"></i>
                        </a>
                    </div>
                </div>
                <div class="right-side-card">
                    <img src="/assets/vegan-store-img.jpg" title="Visit Page" alt="Vegan store" class="project-image"
                        id="vegan-store-image">
                </div>
            </div>

            <div class="project-card">
                <div class="left-side-card">
                    <div>
                        <a href="https://thoughtlessmind.github.io/Vegan-store" target="_blank" class="project-link">
                            <h3 class="project-name">
                                Vegan Store
                            </h3>
                        </a>
                        <p class="project-description">
                            It is a dummy vegan food store website. <br>
                            This is a fully responsive website made using CSS Flexbox and Grids
                        </p>
                    </div>
                    <div title="techstack used" class="tech-stack-container">
                        <p class="tech-stack html-logo">HTML</p>
                        <p class="tech-stack css-logo">CSS</p>
                        <a title="open repo" href="" class="repo-link">
                            <i class="fas fa-code repo-logo"></i>
                        </a>
                    </div>
                </div>
                <div class="right-side-card">
                    <img src="/assets/vegan-store-img.jpg" title="Visit Page" alt="Vegan store" class="project-image"
                        id="vegan-store-image">
                </div>
            </div>

        </div>

        <!-- about section -->

        <div id="about" class="about-section section">
            <h2>About</h2>
            <div class="education-container">
                <h3>Education</h3>
            </div>
        </div>

        <!-- Back to top btn -->
        <div onclick="moveToTop()" id="bttBtn-wrapper">
            <div id="bttBtn">

            </div>
        </div>
    </main>
</body>

</html>

Answer 2

尝试这个

const main = document.querySelector('main');
// main.onscroll = logScroll;

main.addEventListener('scroll', logScroll)

function logScroll(e) {
  console.log(`Scroll position: ${e.target.scrollTop}`);
  if(e.target.scrollTop  == 761){
      console.log('About Page is Reached');
  }
}

注意对于[[target.onscroll

一次只能将一个onscroll处理程序分配给一个对象。为了获得更大的灵活性，您可以改为将滚动事件传递给EventTarget.addEventListener（）方法。

如此处https://developer.mozilla.org/en-US/docs/Web/API/GlobalEventHandlers/onscroll所述

据我在上面的代码中所了解的，

target.scrollTop

仅在您在文档对象中选择了有效目标时才起作用。在这种情况下，当我检查您的html标记时，您已经将整个部分包装到一个主标记中。 现在就这样，我试图获取您的主标签并向其中添加一个eventListener，它对我有用。希望这对您也有用。