我试图将活动类添加到我的按钮上，以便当您单击它们时，悬停动画将保持在活动按钮上。似乎我的javascript中的某些内容没有跟上我将活动类添加到我放置的任何元素上的调用。请帮助thnx ^ _ ^
https://jsfiddle.net/purpkev/pf1vzx2t/7/
HTML：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Ukiyo Sushi ツ</title>
<link href = "/style.css" type = "text/css" rel = "stylesheet">
<link href="https://fonts.googleapis.com/css?family=Fira+Sans&display=swap" rel="stylesheet">
<script src = "/script.js"></script>
</head>
<body>
<!--<div class = "hero active">
<div class = "hero1">
<div class = "hero2">-->
<header id = "bg">
<nav class = "navbar">
<a href = "#" class = "logo">Ukiyo Sushi ツ</a>
<ul>
<li><a href ="#" class = "about">About us</a></li>
<li><a href = "#" class = "menu">Menu</a></li>
<li><a href = "#" class = "services">Services</a></li>
<li><a href = "#" class = "contact">Contact</a></li>
</ul>
</nav>
<div class = "sushiPlatter">
<h2 id = "caption">Chef's Special Sushi Platter</h2>
<div class = "dots">
<button class = "dot" onclick = "imgslider(1)"></button>
<button class = "dot" onclick = "imgslider(2)"></button>
<button class = "dot" onclick = "imgslider(3)"></button>
</div>
<a href = "#">View Menu</a>
</div>
</header>
<!--</div>
</div>
</div>-->
<section class = "idkYet">
<div>
<span>hello I am filler content</span>
</div>
</section>
</body>
</html>
CSS：
.dots{
display: flex;
flex-direction: column;
align-self: flex-end;
margin: 0 1em;
}
.dot{
display: inline-block;
cursor: pointer;
height: 15px;
width: 15px;
background-color: transparent;
border: solid 2px white;
border-radius: 50%;
margin: .2em;
transform: scale(.75);
outline-color: white;
}
.active{
transform: scale(1);
opacity: .25;
}
.dot:hover, .dot:hover, .dot:hover{
transform: scale(1);
opacity: .25;
transition: transform 1s ease-in;
transition: opacity .5s;
}
Javascript：
function buttonClick(){
var button = document.getElementsByClassName("dots");
var dot = button.children;
dot[0].classList.add("active");
for(var i = 0; i < dot.length; i++){
dot[i].addEventListener("click", function(){
var active = document.getElementsByClassName("active");
active[0].className = active[0].className.replace("active", "");
this.className += "active";
});
}
}
编辑： 我已经尝试了注释中的建议，但是活动类仍未添加到活动按钮中，这是我的代码：
function buttonClick(){
var button = document.getElementsByClassName("dots");
var dot = button[0].children;
dot[0].classList.add("active");
for(var i = 0; i < dot.length; i++){
dot[i].addEventListener("click", function(){
var active = document.getElementsByClassName("active");
active[0].className = active[0].className.replace("active", "");
this.className += "active";
});
}
}
答案 0 :(得分：0)
document.getElementsByClassName返回数组。
使用button[0].children或button = document.getElementsByClassName("dots")[0]
我不太擅长使用javascript。我将按照以下方式进行jQuery的等效操作
$('.dots').on('click', '.dot', function(e) {
el = $(this);
el.parents('.dots').find('dot').removeClass('active');
el.addClass('active');
});
答案 1 :(得分：0)
好像您要一次又一次添加eventListeners。
也许尝试这种方法，您可以使用“ this”关键字将button元素发送到函数。...
（请参见小提琴：https://jsfiddle.net/sre1dua9/1/）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Ukiyo Sushi ツ</title>
<link href = "/style.css" type = "text/css" rel = "stylesheet">
<link href="https://fonts.googleapis.com/css?family=Fira+Sans&display=swap" rel="stylesheet">
<script src = "/script.js"></script>
</head>
<body>
<!--<div class = "hero active">
<div class = "hero1">
<div class = "hero2">-->
<header id = "bg">
<nav class = "navbar">
<a href = "#" class = "logo">Ukiyo Sushi ツ</a>
<ul>
<li><a href ="#" class = "about">About us</a></li>
<li><a href = "#" class = "menu">Menu</a></li>
<li><a href = "#" class = "services">Services</a></li>
<li><a href = "#" class = "contact">Contact</a></li>
</ul>
</nav>
<div class = "sushiPlatter">
<h2 id = "caption">Chef's Special Sushi Platter</h2>
<div class = "dots">
<button class = "dot" onclick="window.imgslider(this, 1)"></button>
<button class = "dot" onclick="window.imgslider(this, 2)"></button>
<button class = "dot" onclick="window.imgslider(this, 3)"></button>
</div>
<a href = "#">View Menu</a>
</div>
</header>
<!--</div>
</div>
</div>-->
<section class = "idkYet">
<div>
<span>hello I am filler content</span>
</div>
</section>
</body>
</html>
然后只跟踪最后一次单击的按钮：
var lastDot = null;
window.imgslider = function(elem, x)
{
var bg = document.getElementById("bg");
var dot = document.getElementsByClassName("dot");
var caption = document.getElementById("caption");
switch(x){
case 1:
bg.style.backgroundImage = "-webkit-linear-gradient(rgba(0,0,0,.375), rgba(0,0,0,.375)),url(/img/header.jpg)";
caption.style.marginLeft = "0em";
caption.innerHTML = "Chef's Special Sushi Platter";
break;
case 2:
bg.style.backgroundImage = "-webkit-linear-gradient(rgba(0,0,0,.375), rgba(0,0,0,.375)),url(/img/pokebowl.jpg)";
caption.style.marginLeft = "2em";
caption.innerHTML = "Spring Poke Bowl";
break;
case 3:
bg.style.backgroundImage = "-webkit-linear-gradient(rgba(0,0,0,.375), rgba(0,0,0,.375)),url(/img/ramen.jpg)";
caption.style.marginLeft = "3.75em";
caption.innerHTML = "Miso Ramen";
}
// do dots
if(lastDot){
lastDot.classList.remove("active");
}
elem.classList.add("active");
// store last dot for next click
lastDot = elem;
}