带按钮的自动幻灯片放映 [英] Automatic slideshow with button
本文介绍了带按钮的自动幻灯片放映的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我可以使用JavaScript创建自动幻灯片放映.但是我不仅要手动，而且要有按钮来控制.
I could create the automatic slideshow with a javascript. But I want it not only manual, but control with buttons.
我添加了一些手动控制代码.然后，幻灯片无法正常工作.这是自动幻灯片放映的代码.如何修改它以使用按钮.
I added some manual controlling code. Then the slideshow was not working properly. This is the code for automatic slide show. How to modify this to work with buttons.
var slideIndex = 0;
showSlides();
function showSlides() {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("dot");
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
slideIndex++;
if (slideIndex> slides.length) {slideIndex = 1}
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";
setTimeout(showSlides, 8000); // Change image every 8 seconds
}
#slide{
width:96%;
}
* {
box-sizing: border-box
}
.mySlides {
display: none
}
.slideshow-container {
width: 1200px;
position: relative;
margin: -10px;
}
/* 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;
}
/* 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;
}
/* The dots/bullets/indicators */
.dot {
cursor: pointer;
height: 13px;
width: 13px;
margin: 0 2px;
background-color: #bbb;
border-radius: 50%;
display: inline-block;
transition: background-color 0.6s ease;
}
.active, .dot:hover {
background-color: #717171;
}
/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 2s;
animation-name: fade;
animation-duration: 2s;
}
@-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) {
.text {font-size: 11px}
}
<div id="slide">
<div class="slideshow-container">
<div class="mySlides fade"> <img src="../Images/girl.jpg" style="width:100%"> </div>
<div class="mySlides fade"> <img src="../Images/bride.jpg" style="width:100%"> </div>
<div class="mySlides fade"> <img src="../Images/academy.jpg" style="width:100%"> </div>
<div class="mySlides fade"> <img src="../Images/makeup.jpg" style="width:100%"> </div>
<a class="prev" onclick="plusSlides(-1)">❮</a> <a class="next" onclick="plusSlides(1)">❯</a> </div>
<br>
<div style="text-align:center">
<span class="dot" onclick="currentSlide(1)"></span>
<span class="dot" onclick="currentSlide(2)"></span>
<span class="dot" onclick="currentSlide(3)"></span>
<span class="dot" onclick="currentSlide(4)"></span>
</div>
推荐答案
您未声明在单击按钮时使滑块移动的功能，
You did not declare the functions to make slider move on button click ,
我添加了一些指令，使滑块可同时适用于点和左右按钮，请参见下面的代码段，请在全屏模式下运行该代码段.
I added some instruction that make slider work for both dots and left right buttons , see bellow snippet , kindly run the snippet in full screen .
var slideIndex = 0;
showSlides();
var slides,dots;
function showSlides() {
var i;
slides = document.getElementsByClassName("mySlides");
dots = document.getElementsByClassName("dot");
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
slideIndex++;
if (slideIndex> slides.length) {slideIndex = 1}
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";
setTimeout(showSlides, 8000); // Change image every 8 seconds
}
function plusSlides(position) {
slideIndex +=position;
if (slideIndex> slides.length) {slideIndex = 1}
else if(slideIndex<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 currentSlide(index) {
if (index> slides.length) {index = 1}
else if(index<1){index = 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[index-1].style.display = "block";
dots[index-1].className += " active";
}
#slide{
width:96%;
}
* {
box-sizing: border-box
}
.mySlides {
display: none
}
.slideshow-container {
width: 1200px;
position: relative;
margin: -10px;
}
/* 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;
}
/* 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;
}
/* The dots/bullets/indicators */
.dot {
cursor: pointer;
height: 13px;
width: 13px;
margin: 0 2px;
background-color: #bbb;
border-radius: 50%;
display: inline-block;
transition: background-color 0.6s ease;
}
.active, .dot:hover {
background-color: #717171;
}
/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 2s;
animation-name: fade;
animation-duration: 2s;
}
@-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) {
.text {font-size: 11px}
}
<div id="slide">
<div class="slideshow-container">
<div class="mySlides fade"> <img src="https://www.w3schools.com/howto/img_nature_wide.jpg" style="width:100%"> </div>
<div class="mySlides fade"> <img src="https://www.w3schools.com/howto/img_snow_wide.jpg" style="width:100%"> </div>
<div class="mySlides fade"> <img src="https://www.w3schools.com/howto/img_lights_wide.jpg" style="width:100%"> </div>
<div class="mySlides fade"> <img src="https://www.w3schools.com/howto/img_mountains_wide.jpg" style="width:100%"> </div>
<a class="prev" onclick="plusSlides(-1)">❮</a> <a class="next" onclick="plusSlides(1)">❯</a> </div>
<br>
<div style="text-align:center">
<span class="dot" onclick="currentSlide(1)"></span>
<span class="dot" onclick="currentSlide(2)"></span>
<span class="dot" onclick="currentSlide(3)"></span>
<span class="dot" onclick="currentSlide(4)"></span>
</div>
这篇关于带按钮的自动幻灯片放映的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
