带有箭头和按钮的自动幻灯片

Question

我从 w3schools 关于制作幻灯片的“如何”指南开始，虽然它提供了自动幻灯片或带有控制箭头和幻灯片指示器的选项，但它并没有告诉您如何同时进行。

经过一番搜索，我找到了这个（本文底部的代码）——Automatic slideshow with button——但解决方案有两个问题：

1. 如果我点击底部不是自动显示的下一个指示按钮，幻灯片将成功跳转到该项目，但不会继续到我下一个的幻灯片'刚刚点击;相反，如果我根本没有点击过按钮，它将转到下一个要显示的幻灯片。如果我使用箭头，也会存在同样的问题；底部按钮只是更容易用作示例。
   前任。我有幻灯片，标记为 A、B、C 和 D。页面加载并从幻灯片 A 开始。指定的时间间隔过去了，幻灯片自动移动到 B。我单击幻灯片指示器按钮将自己移动到幻灯片 A ，它会将我移动到 A。然后页面将我带到 C，就好像我从未点击过 A。我希望幻灯片从我单击它的位置 (A) 开始，而不是从在我点击它之前它“打算”去的下一个位置 (C)。
2. 如果我在计数器中的某些时间过去后单击任何按钮更改幻灯片，则计数器不会重置；它会继续，就好像我没有更改幻灯片一样，然后当它再次自动移动时重新开始。
   前任。自动换片前的时间为 5 秒。我在查看幻灯片 A 仅 3 秒后单击向右箭头。然后幻灯片显示为幻灯片 B 但仅在继续播放幻灯片 C 之前的剩余 2 秒内显示。

我尝试了许多解决方案，例如创建函数来重置间隔计时器，但所有这些最终都破坏了代码并使我的幻灯片放映变得很糟糕。我会发布一个指向我的 Codepen 的链接来举例说明，但是自从我今天早些时候制作了这支笔后，一旦我进入我个人资料的“笔”页面，该网站就会停止工作。 （如果你真的感兴趣，去 Codepen 找我——用户名是 lgcorpora——然后尝试点击名为“带按钮的自动幻灯片”的 Pen——应该就在顶部附近。）

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, 4000); // 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: auto;
	position: relative;
	margin: -10px;

}
/* Next & previous buttons */
.prev, .next {
	cursor: pointer;
	position: absolute;
	top: 50%;
	width: auto;
	padding: 16px;
	margin-top: -22px;
	color: #494B55;
	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: #494B55;
}
/* 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}
}

.pics
{
    border:3px solid #494B55;
    width:200px;
}

<div class="ss-container">
                <div class="mySlides fade">
                    <img src="https://www.w3schools.com/css/img_5terre.jpg" class="pics"/>
                </div>
                <div class="mySlides fade">
                    <img src="https://www.w3schools.com/css/img_forest.jpg" class="pics"/>
                </div>
                <div class="mySlides fade">
                    <img src="https://www.w3schools.com/css/img_lights.jpg" class="pics"/>
                </div>
                <div class="mySlides fade">
                    <img src="https://www.w3schools.com/css/img_mountains.jpg" class="pics"/>
                </div>
                <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
                <a class="next" onclick="plusSlides(1)">&#10095;</a>
            </div>
            
            <!--    Putting in the click dots   -->
            <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>

Answer 1

您必须在currentSlide 函数中设置slideIndex。此外，将超时设置为变量 (timer)，以便您可以在手动显示幻灯片时停止它。

var slideIndex = 0;
showSlides();
//add the global timer variable
var slides,dots,timer;

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";
    //put the timeout in the timer variable
    timer = setTimeout(showSlides, 4000); // Change image every 8 seconds
}

function plusSlides(position) {
    //clear/stop the timer
    clearTimeout(timer);
    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";
    //create a new timer
    timer = setTimeout(showSlides, 4000);
}

function currentSlide(index) {
    //clear/stop the timer
    clearTimeout(timer);
    if (index> slides.length) {index = 1}
    else if(index<1){index = slides.length}
    //set the slideIndex with the index of the function
    slideIndex = index;
    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";
    //create a new timer
    timer = setTimeout(showSlides, 4000);
}

#slide{
	width:96%;
	}
	
* {
	box-sizing: border-box
}

.mySlides {
	display: none
}

.slideshow-container {
	width: auto;
	position: relative;
	margin: -10px;

}
/* Next & previous buttons */
.prev, .next {
	cursor: pointer;
	position: absolute;
	top: 50%;
	width: auto;
	padding: 16px;
	margin-top: -22px;
	color: #494B55;
	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: #494B55;
}
/* 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}
}

.pics
{
    border:3px solid #494B55;
    width:200px;
}

<div class="ss-container">
                <div class="mySlides fade">
                    <img src="https://www.w3schools.com/css/img_5terre.jpg" class="pics"/>
                </div>
                <div class="mySlides fade">
                    <img src="https://www.w3schools.com/css/img_forest.jpg" class="pics"/>
                </div>
                <div class="mySlides fade">
                    <img src="https://www.w3schools.com/css/img_lights.jpg" class="pics"/>
                </div>
                <div class="mySlides fade">
                    <img src="https://www.w3schools.com/css/img_mountains.jpg" class="pics"/>
                </div>
                <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
                <a class="next" onclick="plusSlides(1)">&#10095;</a>
            </div>
            
            <!--    Putting in the click dots   -->
            <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>