Question

首先，我知道这个问题在答案没有解决我的问题之前被问过，所以我想再问一遍：我使用了来自＆＃34; W3school＆＃34;的幻灯片代码。它提供了一个很好的动画Jquery幻灯片。不幸的是，我的页面需要不止一个，第二个停止第一个工作。甚至在此之前找到这个解决方案之前，我尝试更改不同幻灯片的对象的CSS和HTML名称，这些问题成功解决了部分问题（第二个没有显示），但如前所述，阻止了第一个工作。幻灯片显示在这里，但点击箭头不会做任何事情。我稍微了解问题是什么，但无法修复。以下是我修改第二个代码的方法：

var slideIndex = 7;
showSlides(slideIndex);

function plusSlides(n) {
    showSlides(slideIndex += n);
}

function currentSlide(n) {
    showSlides(slideIndex = n);
}

function showSlides(n) {
    var i;
    var slides = document.getElementsByClassName("mySlides2");
    var dots = document.getElementsByClassName("dot2");
    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(" active2", "");
    }
    slides[slideIndex-1].style.display = "block";  
    dots[slideIndex-1].className += " active2";
}

如你所见，我刚刚添加了＆＃39; 2＆＃39;对于Jquery和CSS中的每种类型的对象。我想我必须给那些繁殖的命令赋予不同的名称，但是如何做呢？

修改 https://jsfiddle.net/mgb7k239/ 这是Jsfiddle中的一个例子，但我不明白为什么这里第一个甚至不是幻灯片，第二个也不起作用：/它在我的电脑上呢！我忘了在电脑上说，点击第一张幻灯片上的箭头改变第二张照片上的图片！我用互联网上随机的图片替换了图片。

Answer 1

他们的代码中的主要问题在于它是制作好的......对于一个幻灯片显示，当您尝试将其应用于多个幻灯片时，会出现一些严重的问题，正如您所经历的那样。他们使用全局变量（index，n），当你有一个幻灯片放映时没有问题，但有更多的幻灯片 - 难以处理的东西，并且很难将引用到当前幻灯片div 概念。

而且，是的，这是简单的javascript幻灯片，这里没有jQuery。我稍微改变了你的HTML和CSS（点div是INSIDE幻灯片div，只是为了更容易定位），而且，我已经删除了内联事件处理程序，只是为了让事情变得更容易和更清洁。

这可以通过多种方式解决，我选择了这个：

(function() {

  init(); //on page load - show first slide, hidethe rest

  function init() {

    parents = document.getElementsByClassName('slideshow-container');

    for (j = 0; j < parents.length; j++) {
      var slides = parents[j].getElementsByClassName("mySlides");
      var dots = parents[j].getElementsByClassName("dot");
      slides[0].classList.add('active-slide');
      dots[0].classList.add('active');
    }
  }

  dots = document.getElementsByClassName('dot'); //dots functionality

  for (i = 0; i < dots.length; i++) {

    dots[i].onclick = function() {

      slides = this.parentNode.parentNode.getElementsByClassName("mySlides");

      for (j = 0; j < this.parentNode.children.length; j++) {
        this.parentNode.children[j].classList.remove('active');
        slides[j].classList.remove('active-slide');
        if (this.parentNode.children[j] == this) {
          index = j;
        }
      }
      this.classList.add('active');
      slides[index].classList.add('active-slide');

    }
  }
//prev/next functionality
  links = document.querySelectorAll('.slideshow-container a');

  for (i = 0; i < links.length; i++) {
    links[i].onclick = function() {
      current = this.parentNode;

      var slides = current.getElementsByClassName("mySlides");
      var dots = current.getElementsByClassName("dot");
      curr_slide = current.getElementsByClassName('active-slide')[0];
      curr_dot = current.getElementsByClassName('active')[0];
      curr_slide.classList.remove('active-slide');
      curr_dot.classList.remove('active');
      if (this.className == 'next') {

        if (curr_slide.nextElementSibling.classList.contains('mySlides')) {
          curr_slide.nextElementSibling.classList.add('active-slide');
          curr_dot.nextElementSibling.classList.add('active');
        } else {
          slides[0].classList.add('active-slide');
          dots[0].classList.add('active');
        }

      }

      if (this.className == 'prev') {

        if (curr_slide.previousElementSibling) {
          curr_slide.previousElementSibling.classList.add('active-slide');
          curr_dot.previousElementSibling.classList.add('active');
        } else {
          slides[slides.length - 1].classList.add('active-slide');
          dots[slides.length - 1].classList.add('active');
        }

      }

    }

  }
})();

 /* Slideshow container */
 
 
.slideshow-container {
  max-width: 1000px;
  position: relative;
  margin: auto;
}

/* Next & previous buttons */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  margin-top: -22px;
  padding: 16px;
  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:20px;
  width: 100%;
  text-align: center;
}
.mySlides {
  display:none;
}
.active-slide {
  display:block;
}
/* Number text (1/3 etc) */
.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}

/* 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: 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}
}

<div class="slideshow-container">
  <div class="mySlides fade">
    <div class="numbertext">1 / 4</div>
    <img src="http://www.w3schools.com/howto/img_mountains_wide.jpg" style="width:100%">
    <div class="text">Caption Text</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">2 / 4</div>
    <img src="http://www.w3schools.com/howto/img_fjords_wide.jpg" style="width:100%">
    <div class="text">Caption Two</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">3 / 4</div>
    <img src="http://www.w3schools.com/howto/img_nature_wide.jpg" style="width:100%">
    <div class="text">Caption Three</div>
  </div>
  
    <div class="mySlides fade">
    <div class="numbertext">4 / 4</div>
    <img src="http://placehold.it/1000x350" style="width:100%">
    <div class="text">Caption Four</div>
  </div>

  <a class="prev">&#10094;</a>
  <a class="next">&#10095;</a>

<div style="text-align:center">
  <span class="dot"></span>
  <span class="dot" ></span>
  <span class="dot" ></span>
   <span class="dot"></span>
</div>
</div>
<br>








<div class="slideshow-container">
  <div class="mySlides fade">
    <div class="numbertext">1 / 3</div>
    <img src="http://www.w3schools.com/howto/img_mountains_wide.jpg" style="width:100%">
    <div class="text">Caption Text</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">2 / 3</div>
    <img src="http://www.w3schools.com/howto/img_fjords_wide.jpg" style="width:100%">
    <div class="text">Caption Two</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">3 / 3</div>
    <img src="http://www.w3schools.com/howto/img_nature_wide.jpg" style="width:100%">
    <div class="text">Caption Three</div>
  </div>

  <a class="prev" >&#10094;</a>
  <a class="next">&#10095;</a>
<div style="text-align:center">
  <span class="dot"></span>
  <span class="dot"></span>
  <span class="dot"></span>
</div>  
</div>


<br>

因此，如果您保留幻灯片div的当前HTML结构，这应该有效，并且您可以无限制地播放独立幻灯片。这是非常老式的js，应该很清楚，如果事情不清楚，我可以解释更多......或者试着更好地解释。：）

Answer 2

我在这里创建了一个解决方案：

var sliderObjects = [];
createSliderObjects();

function plusDivs(obj, n) {
  var parentDiv = $(obj).parent();
  var matchedDiv;
  $.each(sliderObjects, function(i, item) {
    if ($(parentDiv[0]).attr('id') == $(item).attr('id')) {
      matchedDiv = item;
      return false;
    }
  });
  matchedDiv.slideIndex=matchedDiv.slideIndex+n;
  showDivs(matchedDiv, matchedDiv.slideIndex);
}

function createSliderObjects() {
  var sliderDivs = $('.slider');
  $.each(sliderDivs, function(i, item) {
    var obj = {};
    obj.id = $(item).attr('id');
    obj.divContent = item;
    obj.slideIndex = 1;
    obj.slideContents = $(item).find('.mySlides');
    showDivs(obj, 1);
    sliderObjects.push(obj);
  });
}

function showDivs(divObject, n) {
  debugger;
  var i;
  if (n > divObject.slideContents.length) {
    divObject.slideIndex = 1
  }
  if (n < 1) {
    divObject.slideIndex = divObject.slideContents.length
  }
  for (i = 0; i < divObject.slideContents.length; i++) {
    divObject.slideContents[i].style.display = "none";
  }
  divObject.slideContents[divObject.slideIndex - 1].style.display = "block";
}

<link href="http://www.w3schools.com/lib/w3.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h2 class="w3-center">Manual Slideshow</h2>

<div class="w3-content w3-display-container slider" id="div1">
  <img class="mySlides" src="https://i.imgur.com/eLarayS.jpg" style="width:100%">
  <img class="mySlides" src="https://i.imgur.com/xpOiMWh.jpg" style="width:100%">
  <img class="mySlides" src="https://i.imgur.com/lgcC8Y5.jpg" style="width:100%">
  <img class="mySlides" src="http://i.imgur.com/ufmiVTQ.jpg" style="width:100%">

  <a class="w3-btn-floating w3-display-left" onclick="plusDivs(this,-1)">&#10094;</a>
  <a class="w3-btn-floating w3-display-right" onclick="plusDivs(this,1)">&#10095;</a>
</div>

<div class="w3-content w3-display-container slider" id="div2">
  <img class="mySlides" src="https://i.imgur.com/eLarayS.jpg" style="width:100%">
  <img class="mySlides" src="https://i.imgur.com/xpOiMWh.jpg" style="width:100%">
  <img class="mySlides" src="https://i.imgur.com/lgcC8Y5.jpg" style="width:100%">
  <img class="mySlides" src="http://i.imgur.com/ufmiVTQ.jpg" style="width:100%">

  <a class="w3-btn-floating w3-display-left" onclick="plusDivs(this, -1)">&#10094;</a>
  <a class="w3-btn-floating w3-display-right" onclick="plusDivs(this, 1)">&#10095;</a>
</div>

现在，您可以为具有“滑块”类和唯一ID的滑块添加任意数量的div。

Answer 3

问题通过数组和索引操作来解决

数组的大小应根据幻灯片的数量

var slideIndex = new Array(2);
slideIndex[0]=1;
slideIndex[1]=1;

showSlides(1, 0);  
showSlides(1, 1);


function plusSlides(n, slideshownumber) 
{
  slideIndex[slideshownumber] = slideIndex[slideshownumber] + n; 
  showSlides( slideIndex[slideshownumber], slideshownumber );
}

function currentSlide(n, slideshownumber) 
{
  slideIndex[slideshownumber] = n;
  showSlides(slideIndex[slideshownumber], slideshownumber);
}

function showSlides(n, slideshownumber) 
{
  var i;

在'slider'+ slideshownumer建立名称，基于0的计数（重要）

  var slideshowname = "slider" + slideshownumber;
  var slides = document.getElementsByName(slideshowname);

在'dot'+ slideshownumer建立名称，基于0的计数（重要）

  var dotname = "dot" + slideshownumber;
  var dots = document.getElementsByName(dotname);

  if (n > slides.length) 
  {
      slideIndex[slideshownumber] = 1;
  }

  if (n < 1) 
  {
      slideIndex[slideshownumber] = 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[slideshownumber]-1].style.display = "block";
  dots[slideIndex[slideshownumber]-1].className += " active";
}

幻灯片放映的示例，点和滑块名称应该进展到slider1，slider2，...

<div class="slideshow-container">
  <div class="mySlides fade" name="slider0">
    <div class="numbertext">1 / 2</div>
    <img src="http://www.w3schools.com/howto/img_mountains_wide.jpg" style="width:100%">
  </div>
  <div class="mySlides fade" name="slider0">
    <div class="numbertext">2 / 2</div>
    <img src="http://www.w3schools.com/howto/img_fjords_wide.jpg" style="width:100%">
  </div>

plusSlides（返回-1，幻灯片0） plusSlides（1表示转发，幻灯片0）

  <a class="prev" onclick="plusSlides(-1,0)">&#10094;</a>
  <a class="next" onclick="plusSlides(1,0)">&#10095;</a>
</div>

初始化

<script> currentSlide(1,0)</script>

function currentSlide（slidenumber，slideshownumber）对于点和上一个/下一个按钮！

<div style="text-align:center">
 <span class="dot" name="dot0" onclick="currentSlide(1,0)"></span>
 <span class="dot" name="dot0" onclick="currentSlide(2,0)"></span>
</div>

下一个名为slider1的滑块

<div class="slideshow-container">
  <div class="mySlides fade" name="slider1">
    <div class="numbertext">1 / 2</div>
    <img src="http://www.w3schools.com/howto/img_nature_wide.jpg" style="width:100%">
  </div>
  <div class="mySlides fade" name="slider1">
    <div class="numbertext">2 / 2</div>
    <img src="http://www.w3schools.com/howto/img_mountains_wide.jpg" style="width:100%">
  </div>

立即更改了slider1的参数

  <a class="prev" onclick="plusSlides(-1,1)">&#10094;</a>
  <a class="next" onclick="plusSlides(1,1)">&#10095;</a>
</div>

<script> currentSlide(1,1)</script>

<div style="text-align:center">
 <span class="dot" name="dot1" onclick="currentSlide(1,1)"></span>
 <span class="dot" name="dot1" onclick="currentSlide(2,1)"></span>
</div>

一个页面上的多个幻灯片显示第一个不再有效

3 个答案: