javascript - 如何在 html 中单击(或激活)幻灯片时将背景图像添加到幻灯片中的导航项目符号
问题描述
我创建了一个带有自定义导航项目符号的幻灯片。每个子弹都有自己定制的圆形图像。现在的问题是我有每个子弹的背景图像,它应该在单击或激活子弹时出现。
我试图添加使用.active
如下的 CSS 功能来更改背景图像,但它不起作用。
CSS
.bulletOne:active {
background-image: url("http://localhost/wordpress/wp-content/uploads/2020/06/CallOfDuty_2.png");
}
下面添加了我的完整 HTML 代码以及 css、html 和 js 供您参考,请帮助我。先感谢您
除了图像链接,其他一切都可以正常工作,您可以通过替换 w3schools 中的这些链接来测试它尝试平台
完整代码
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
* {box-sizing: border-box}
body {font-family: Verdana, sans-serif; margin:0}
.mySlides {display: none}
img {vertical-align: middle;}
/* Slideshow container */
.slideshow-container {
max-width: 1000px;
position: relative;
margin: auto;
}
/* Next & previous buttons */
.prev, .next {
cursor: pointer;
position: absolute;
top: 50%;
width: auto;
padding: 16px;
margin-top: -22px;
color: white;
font-weight: bold;
font-size: 18px;
transition: 0.6s ease;
border-radius: 0 3px 3px 0;
user-select: none;
}
/* Position the "next button" to the right */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}
/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
background-color: rgba(0,0,0,0.8);
}
/* Caption text */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 8px;
width: 100%;
text-align: center;
}
/* Number text (1/3 etc) */
/* The dots/bullets/indicators */
.dotOne {
cursor: pointer;
height: 75px;
width: 75px;
padding: 8px 40px 20px;
margin: 0 2px;
background-image: url("http://localhost/wordpress/wp-content/uploads/2020/06/Cyberpunk-2077.png");
border-radius: 50%;
display: inline-block;
transition:background-color :#ffffff;
}
.dotTwo {
cursor: pointer;
height: 75px;
width: 75px;
padding: 8px 40px 20px;
margin: 0 2px;
background-image: url("http://localhost/wordpress/wp-content/uploads/2020/06/Sales_Icon_Cropped.png");
border-radius: 50%;
display: inline-block;
transition:background-color :#ffffff;
}
.dotThree {
cursor: pointer;
height: 75px;
width: 75px;
padding: 8px 40px 20px;
margin: 0 2px;
background-image: url("http://localhost/wordpress/wp-content/uploads/2020/06/CallOfDuty_2.png");
border-radius: 50%;
display: inline-block;
transition:background-color :#ffffff;
}
.dotFour {
cursor: pointer;
height: 75px;
width: 75px;
padding: 8px 40px 20px;
margin: 0 2px;
background-image: url("http://localhost/wordpress/wp-content/uploads/2020/06/Age-of-Empires-IV.png");
border-radius: 50%;
display: inline-block;
transition:background-color :#ffffff;
}
.dotFour:active {
background-image: url("http://localhost/wordpress/wp-content/uploads/2020/06/CallOfDuty_2.png");
}
/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 1.5s;
animation-name: fade;
animation-duration: 1.5s;
}
@-webkit-keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
@keyframes fade {
from {opacity: .4}
to {opacity: 1}
}
/* On smaller screens, decrease text size */
@media only screen and (max-width: 300px) {
.prev, .next,.text {font-size: 11px}
}
</style>
</head>
<body>
<div style="text-align:center">
<span class="dotOne" onclick="currentSlide(1)"></span>
<span class="dotTwo" onclick="currentSlide(2)"></span>
<span class="dotThree" onclick="currentSlide(3)"></span>
<span class="dotFour" onclick="currentSlide(4)"></span>
</div>
<div class="slideshow-container">
<div class="mySlides fade">
<img src="http://localhost/wordpress/wp-content/uploads/2020/06/HellBlade_2.png" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://localhost/wordpress/wp-content/uploads/2020/06/CallOfDuty_WarZone_PC.png" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://localhost/wordpress/wp-content/uploads/2020/06/CallOfDuty_2.png" style="width:100%">
</div>
<div class="mySlides fade">
<img src="http://localhost/wordpress/wp-content/uploads/2020/06/Age-of-Empires-IV.png" style="width:100%">
</div>
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
</div>
<br>
<script>
var slideIndex = 1;
showSlides(slideIndex);
function plusSlides(n) {
showSlides(slideIndex += n);
}
function currentSlide(n) {
showSlides(slideIndex = n);
}
function showSlides(n) {
var i;
var dots;
var slides = document.getElementsByClassName("mySlides");
if(n==1){
dots = document.getElementsByClassName("dotOne");
}else if(n==2){
dots = document.getElementsByClassName("dotTwo");
}else if(n==3){
dots = document.getElementsByClassName("dotThree");
}else if(n==4){
dots = document.getElementsByClassName("dotFour");
}
if (n > slides.length) {slideIndex = 1}
if (n < 1) {slideIndex = slides.length}
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex-1].style.display = "block";
dots[slideIndex-1].className += " active";
}
</script>
</body>
</html>
解决方案
有一些问题。
- 在脚本中,
var dots
应该是一个数组。我将该类添加dots
到 html 中的点元素中,并在脚本中进行了所需的调整。
var dots = document.getElementsByClassName("dots");
在 css 中,您使用的是
dots:active
,但我不确定这是您想要的。将
:active
选择器用于单击项目符号时发生的事件。使用自定义类
.active
来设置与当前显示的图像相对应的项目符号的样式。
这是编辑后的片段。我包括了:active
,.active
和:hover
可能性。只需将样式更改为您想要的样式即可。
:focus
不适用于这里。您不能将焦点应用于所有 HTML 元素。如果您想了解更多信息,请阅读此内容。
var slideIndex = 1;
showSlides(slideIndex);
function plusSlides(n) {
showSlides(slideIndex += n);
}
function currentSlide(n) {
showSlides(slideIndex = n);
}
function showSlides(n) {
var i;
var dots = document.getElementsByClassName("dots");
var slides = document.getElementsByClassName("mySlides");
if (n > slides.length) {
slideIndex = 1
}
if (n < 1) {
slideIndex = slides.length
}
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex - 1].style.display = "block";
dots[slideIndex - 1].className += " active";
}
function goToSlideshow(){
var slideshow = document.getElementsByClassName("slideshow-container");
slideshow[0].scrollIntoView({ behavior: 'smooth' });
}
* {
box-sizing: border-box
}
body {
font-family: Verdana, sans-serif;
margin: 0
}
.mySlides {
display: none
}
img {
vertical-align: middle;
}
/* Slideshow container */
.slideshow-container {
max-width: 1000px;
position: relative;
margin: auto;
}
/* Next & previous buttons */
.prev,
.next {
cursor: pointer;
position: absolute;
top: 50%;
width: auto;
padding: 16px;
margin-top: -22px;
color: white;
font-weight: bold;
font-size: 18px;
transition: 0.6s ease;
border-radius: 0 3px 3px 0;
user-select: none;
}
/* Position the "next button" to the right */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}
/* On hover, add a black background color with a little bit see-through */
.prev:hover,
.next:hover {
background-color: rgba(0, 0, 0, 0.8);
}
/* Caption text */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 8px;
width: 100%;
text-align: center;
}
/* Number text (1/3 etc) */
/* The dots/bullets/indicators */
.dotOne {
cursor: pointer;
height: 75px;
width: 75px;
padding: 8px 40px 20px;
margin: 0 2px;
background-image: url("https://images.unsplash.com/photo-1514530963096-e9aa1f285eb5?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=750&q=80");
border-radius: 50%;
display: inline-block;
transition: background-color:#ffffff;
}
.dotTwo {
cursor: pointer;
height: 75px;
width: 75px;
padding: 8px 40px 20px;
margin: 0 2px;
background-image: url("https://images.unsplash.com/photo-1484447089447-a742155835e2?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=750&q=80");
border-radius: 50%;
display: inline-block;
transition: background-color:#ffffff;
}
.dotThree {
cursor: pointer;
height: 75px;
width: 75px;
padding: 8px 40px 20px;
margin: 0 2px;
background-image: url("https://images.unsplash.com/photo-1504909297680-b34eb832a31f?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=750&q=80");
border-radius: 50%;
display: inline-block;
transition: background-color:#ffffff;
}
.dotFour {
cursor: pointer;
height: 75px;
width: 75px;
padding: 8px 40px 20px;
margin: 0 2px;
background-image: url("https://images.unsplash.com/photo-1445023835378-9fa9a2089f0c?ixlib=rb-1.2.1&auto=format&fit=crop&w=667&q=80");
border-radius: 50%;
display: inline-block;
transition: background-color:#ffffff;
}
.dots:hover{
background: lightgreen;
}
.dots:active {
background: red;
}
.dots.active {
border: 2px solid red;
}
/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 1.5s;
animation-name: fade;
animation-duration: 1.5s;
}
@-webkit-keyframes fade {
from {
opacity: .4
}
to {
opacity: 1
}
}
@keyframes fade {
from {
opacity: .4
}
to {
opacity: 1
}
}
/* On smaller screens, decrease text size */
@media only screen and (max-width: 300px) {
.prev,
.next,
.text {
font-size: 11px
}
}
<body>
<div style="text-align:center">
<span class="dots dotOne" onclick="currentSlide(1); goToSlideshow();"></span>
<span class="dots dotTwo" onclick="currentSlide(2); goToSlideshow();"></span>
<span class="dots dotThree" onclick="currentSlide(3); goToSlideshow();"></span>
<span class="dots dotFour" onclick="currentSlide(4); goToSlideshow();"></span>
</div>
<div class="slideshow-container">
<div class="mySlides fade">
<img src="https://images.unsplash.com/photo-1514530963096-e9aa1f285eb5?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=750&q=80" style="width:100%">
</div>
<div class="mySlides fade">
<img src="https://images.unsplash.com/photo-1484447089447-a742155835e2?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=750&q=80" style="width:100%">
</div>
<div class="mySlides fade">
<img src="https://images.unsplash.com/photo-1504909297680-b34eb832a31f?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=750&q=80" style="width:100%">
</div>
<div class="mySlides fade">
<img src="https://images.unsplash.com/photo-1445023835378-9fa9a2089f0c?ixlib=rb-1.2.1&auto=format&fit=crop&w=667&q=80" style="width:100%">
</div>
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
</div>
<br>
</body>
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