JQuery：删除图像滑块中的当前div

Question

我有一个图像滑块可以在图像之间切换，有两个按钮，第一个将项添加到滑块，第二个从滑块中删除当前图像但不起作用。

如何使移除项目按钮从滑块中删除当前项目？

＆＃13;

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var slideIndex = 1;
showSlides(slideIndex);

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

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

function showSlides(n) {
    var i;
    var slides = document.getElementsByClassName("mySlides");
    var dots = document.getElementsByClassName("dot");
    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";
}

$('#NewsItem').click(function () {
    
    var maindiv = $("<div class='mySlides fade'>")
                 .append($("<div class='numbertext'>4 / 4</div>"))
                 .append($("<img src='4.jpg' style='width:100%;height:650px' />"))
                 .append($("<div class='text'>Caption Four</div>"));

    $('.slideshow-container').append(maindiv);
    $('.footer').append($("<span class='dot' onclick='currentSlide(4)'></span>"));
});

＆＃13;

* {box-sizing:border-box}
body {font-family: Verdana,sans-serif;margin:0}
.mySlides {display:none}

/* 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;
}

/* 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) */
.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}
}

/* On smaller screens, decrease text size */
@media only screen and (max-width: 300px) {
  .prev, .next,.text {font-size: 11px}
}

＆＃13;

 <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>

 <button id="NewsItem">Add Item</button> 
    <button id="RemoveItem">remove Item</button> 

 <div class="slideshow-container">

    <div class="mySlides fade">
        <div class="numbertext">1 / 3</div>
        <img src="1.jpg" style="width:100%" />
        <div class="text">Caption Text</div>
    </div>

    <div class="mySlides fade">
        <div class="numbertext">2 / 3</div>
        <img src="2.jpg" style="width:100%" />
        <div class="text">Caption Two</div>
    </div>

    <div class="mySlides fade">
        <div class="numbertext">3 / 3</div>
        <img src="3.jpg" style="width:100%" /> 
        <div class="text">Caption Three</div>
    </div>
     
     <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
     <a class="next" onclick="plusSlides(1)">&#10095;</a>
    </div>
    <br />

    <div style="text-align:center" class="footer">
        <span class="dot" onclick="currentSlide(1)"></span> 
        <span class="dot" onclick="currentSlide(2)"></span> 
        <span class="dot" onclick="currentSlide(3)"></span> 
    </div>

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Answer 1

我已编辑您的代码以删除活动幻灯片。但是，当您的列表用尽时，这可能会导致错误，因为您用于滑动的方法不正确。您需要通过将索引设置为data-attr来跟踪当前幻灯片，并在按钮click.ie上创建回溯索引。幻灯片的索引也应为动态幻灯片创建，也可以自动递增。

var slideIndex = 1;
showSlides(slideIndex);

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

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

function showSlides(n) {
    var i;
    var slides = document.getElementsByClassName("mySlides");
    var dots = document.getElementsByClassName("dot");
    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";
    slides[slideIndex - 1].className += " active";
    slides[slideIndex - 1].id=slideIndex;
    dots[slideIndex - 1].className += " active";
}
$('#RemoveItem').click(function () {
 $(".active").remove();
});
$('#NewsItem').click(function () {
    
    var maindiv = $("<div class='mySlides fade'>")
                 .append($("<div class='numbertext'>4 / 4</div>"))
                 .append($("<img src='4.jpg' style='width:100%;height:650px' />"))
                 .append($("<div class='text'>Caption Four</div>"));

    $('.slideshow-container').append(maindiv);
    $('.footer').append($("<span class='dot' onclick='currentSlide(4)'></span>"));
});

* {box-sizing:border-box}
body {font-family: Verdana,sans-serif;margin:0}
.mySlides {display:none}

/* 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;
}

/* 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);
}
.slideshow-container{
 margin-top:20px;
} 
/* 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) */
.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}
}

/* On smaller screens, decrease text size */
@media only screen and (max-width: 300px) {
  .prev, .next,.text {font-size: 11px}
}

 <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>

 <button id="NewsItem">Add Item</button> 
    <button id="RemoveItem">remove Item</button> 

 <div class="slideshow-container">

    <div class="mySlides fade">
        <div class="numbertext">1 / 3</div>
        <img src="1.jpg" style="width:100%" />
        <div class="text">Caption Text</div>
    </div>

    <div class="mySlides fade">
        <div class="numbertext">2 / 3</div>
        <img src="2.jpg" style="width:100%" />
        <div class="text">Caption Two</div>
    </div>

    <div class="mySlides fade">
        <div class="numbertext">3 / 3</div>
        <img src="3.jpg" style="width:100%" /> 
        <div class="text">Caption Three</div>
    </div>
     
     <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
     <a class="next" onclick="plusSlides(1)">&#10095;</a>
    </div>
    <br />

    <div style="text-align:center" class="footer">
        <span class="dot" onclick="currentSlide(1)"></span> 
        <span class="dot" onclick="currentSlide(2)"></span> 
        <span class="dot" onclick="currentSlide(3)"></span> 
    </div>