同じhtml文書に複数のスライドショーを作成するにはどうすればよいですか？

Question

ここではw3schoolsの例を使用しています：https://www.w3schools.com/howto/howto_js_slideshow.aspしかし、2番目のスライドショーを追加しようとすると、最初のスライドショーまで移動するまで表示されません。 I.Eだけスライドショーの1つが一度に開いています。同時に複数のスライドショー（最小4枚）を表示して使用するにはどうすればよいですか？

Answer 1

各スライドコンテナにIDを割り当て、すべてのスライドショー機能にIDを割り当てます。さらに、同じオブジェクトを使用して、現在のスライドショーインデックスを追跡します。

var slideshow1 = document.getElementById("slideshow1"); 
 
slideshow1.currentSlideIndex = 1; 
 
showSlides(slideshow1.currentSlideIndex, slideshow1); 
 

 
var slideshow2 = document.getElementById("slideshow2"); 
 
slideshow2.currentSlideIndex = 1; 
 
showSlides(slideshow2.currentSlideIndex, slideshow2); 
 

 

 
function plusSlides(n, slideshow) { 
 
    showSlides(slideshow.currentSlideIndex += n, slideshow); 
 
} 
 

 
function currentSlide(n, slideshow) { 
 
    showSlides(slideshow.currentSlideIndex = n, slideshow); 
 
} 
 

 
function showSlides(n, slideshow) { 
 
    
 

 

 
    var i; 
 
    var slides = slideshow.getElementsByClassName("mySlides"); 
 
    var dots = slideshow.getElementsByClassName("dot"); 
 
    if (n > slides.length) {slideshow.currentSlideIndex = 1}  
 
    if (n < 1) {slideshow.currentSlideIndex = 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[slideshow.currentSlideIndex-1].style.display = "block"; 
 
    dots[slideshow.currentSlideIndex-1].className += " active"; 
 
}

* {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} 
 
}

<div id="slideshow1" class="slideshow-container"> 
 

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

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

 
<a class="prev" onclick="plusSlides(-1,slideshow1)">&#10094;</a> 
 
<a class="next" onclick="plusSlides(1, slideshow1)">&#10095;</a> 
 

 

 
<div style="text-align:center"> 
 
    <span class="dot" onclick="currentSlide(1, slideshow1)"></span> 
 
    <span class="dot" onclick="currentSlide(2, slideshow1)"></span> 
 
    <span class="dot" onclick="currentSlide(3, slideshow1)"></span> 
 
</div> 
 
</div> 
 
<br> 
 

 

 

 

 

 
<div id="slideshow2" class="slideshow-container"> 
 

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

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

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

 

 
<div style="text-align:center"> 
 
    <span class="dot" onclick="currentSlide(1, slideshow2)"></span> 
 
    <span class="dot" onclick="currentSlide(2, slideshow2)"></span> 
 
    <span class="dot" onclick="currentSlide(3, slideshow2)"></span> 
 
</div> 
 
</div> 
 
<br>