jQuery的：刪除圖像滑塊中的當前股利

Question

我有一個可以在圖像之間切換的圖像滑塊，有兩個按鈕，第一個按鈕向滑塊添加一個項目，第二個按鈕從滑塊中刪除當前圖像，但是不起作用。

如何使“刪除項目”按鈕從滑塊上刪除當前項目？

 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>")); }); 

 * {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} } 

  <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> 

Answer 1

我已經編輯了您的代碼以刪除活動幻燈片。 但這可能會導致錯誤，因為您使用的滑動方法不合適，導致列表用盡。 您需要通過將index設置為data-attr來跟蹤當前幻燈片，並在按鈕click上檢索索引。ie應該為動態幻燈片創建幻燈片索引，該幻燈片也可以自動遞增。

 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>