自动播放幻灯片容器

时间：2017-01-10 17:14:13

标签： javascript html css

我创建了一个新网页，其中有一个带有6个边的幻灯片放映容器。现在我可以手动点击下一个/上一个按钮并查看下一个/上一个幻灯片，但我需要知道如何通过每3秒钟一个新的幻灯片自动播放它们。

这是我的剧本：

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";
}
</script>
.slideshow-container {
  position: relative;
  max-width: 90%;
  margin: auto;
  animation: 30s slidy infinite; 
 
}
/* 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: 25px;
  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: white;
  font-size: 25px;
  padding: 8px 12px;
  position: absolute;
  bottom: 18px;
  width: 100%;
  text-align: center;
}
.textwbg {
  color: Black;
  font-size: 25px;
  padding: 8px 12px;
  position: absolute;
  bottom: 18px;
  width: 100%;
  text-align: center;
}
/* Number text (1/3 etc) */
.numbertext {
  color: #f2f2f2;
  font-size: 25px;
  padding: 8px 12px;
  position: absolute;
  top: 2;
}
/* The dots/bullets/indicators */
.dot {
  cursor:pointer;
  height: 13px;
  width: 13px;
  margin: 0 2px;
  background-color: #66b8ff;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}
.active, .dot:hover {
  background-color: #555;
}
/* Fading animation */
.fade {
  -webkit-animation-name: fade;
  -webkit-animation-duration: 2s;
  animation-name: fade;
  animation-duration: 3s;

}
.nextbutton {
	position: relative;
	
}
<div class="slideshow-container">

	<div class="mySlides fade">
		<div class="numbertext">1 / 6</div>
		<img src="gal/a1.jpg" style="width:100%">
		<div class="text">Our Mission</div>
	</div>

	<div class="mySlides fade">
		<div class="numbertext">2 / 6</div>
		<img src="gal/a2.jpg" style="width:100%">
		<div class="textwbg">Our Doctor Pannel</div>
	</div>

	<div class="mySlides fade">
		<div class="numbertext">3 / 6</div>
		<img src="gal/a3.jpg" style="width:100%">
		<div class="textwbg">Make an Appointment</div>
	</div>

	<div class="mySlides fade">
		<div class="numbertext">4 / 6</div>
		<img src="gal/a4.jpg" style="width:100%">
		<div class="text">Friendly Environment</div>
	</div>

	<div class="mySlides fade">
		<div class="numbertext">5 / 6</div>
		<img src="gal/a5.jpg" style="width:100%">
		<div class="textwbg">24/7</div>
	</div>

	<div class="mySlides fade">
		<div class="numbertext">6 / 6</div>
		<img src="gal/a6.jpg" style="width:100%">
		<div class="textwbg">Facilities</div>
	</div>

	<a class="prev" onclick="plusSlides(-1)">O</a>
	<a class="next" onclick="plusSlides(1)">O</a>

</div>
<br>

<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> 
  <span class="dot" onclick="currentSlide(5)"></span> 
  <span class="dot" onclick="currentSlide(6)"></span> 
  
</div>

<script>

var slideIndex = 1;
showSlides(slideIndex);

3 个答案:

答案 0 :(得分：1)

执行自动执行的代码是setInterval。如果您需要澄清setInterval和setTimeout之间的区别，请查看此answer

＆＃13;
＆＃13; 
var slideIndex = 0;
showSlides();

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

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

function showSlides() {
  var i;
  var slides = document.getElementsByClassName("mySlides");

  for (i = 0; i < slides.length; i++) {
    slides[i].style.display = "none";
  }

  slideIndex++;

  if (slideIndex > slides.length) {
    slideIndex = 1;
  }

  slides[slideIndex - 1].style.display = "block";

  setInterval(showSlides, 3000); // Here is the magic!, change the slide every 3 seconds
}
＆＃13; 
.slideshow-container {
  position: relative;
  max-width: 90%;
  margin: auto;
  animation: 30s slidy infinite;
}
/* 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: 25px;
  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: white;
  font-size: 25px;
  padding: 8px 12px;
  position: absolute;
  bottom: 18px;
  width: 100%;
  text-align: center;
}
.textwbg {
  color: Black;
  font-size: 25px;
  padding: 8px 12px;
  position: absolute;
  bottom: 18px;
  width: 100%;
  text-align: center;
}
/* Number text (1/3 etc) */

.numbertext {
  color: #f2f2f2;
  font-size: 25px;
  padding: 8px 12px;
  position: absolute;
  top: 2;
}
/* The dots/bullets/indicators */

.dot {
  cursor: pointer;
  height: 13px;
  width: 13px;
  margin: 0 2px;
  background-color: #66b8ff;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}
.active,
.dot:hover {
  background-color: #555;
}
/* Fading animation */

.fade {
  -webkit-animation-name: fade;
  -webkit-animation-duration: 2s;
  animation-name: fade;
  animation-duration: 3s;
}
.nextbutton {
  position: relative;
}
＆＃13; 
<div class="slideshow-container">

  <div class="mySlides fade">
    <div class="numbertext">1 / 6</div>
    <img src="gal/a1.jpg" style="width:100%">
    <div class="text">Our Mission</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">2 / 6</div>
    <img src="gal/a2.jpg" style="width:100%">
    <div class="textwbg">Our Doctor Pannel</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">3 / 6</div>
    <img src="gal/a3.jpg" style="width:100%">
    <div class="textwbg">Make an Appointment</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">4 / 6</div>
    <img src="gal/a4.jpg" style="width:100%">
    <div class="text">Friendly Environment</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">5 / 6</div>
    <img src="gal/a5.jpg" style="width:100%">
    <div class="textwbg">24/7</div>
  </div>

  <div class="mySlides fade">
    <div class="numbertext">6 / 6</div>
    <img src="gal/a6.jpg" style="width:100%">
    <div class="textwbg">Facilities</div>
  </div>

  <a class="prev" onclick="plusSlides(-1)">O</a>
  <a class="next" onclick="plusSlides(1)">O</a>

</div>
<br>
<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> 
  <span class="dot" onclick="currentSlide(5)"></span> 
  <span class="dot" onclick="currentSlide(6)"></span> 

</div>
＆＃13;
＆＃13;
＆＃13;

答案 1 :(得分：0)

您可以使用setInterval功能来实现此目标

答案 2 :(得分：0)

这是更新的代码，工作正常。我使用from config import proxy from config import cvs_site from urllib import request class Collector(object): """ Class Collector ...""" def __init__(self, code_num=''): self.code_num = sec_id.upper() self.csv_file = 'csv_files/code_num.csv' # load proxy if it is configured if proxy: proxies = {'http': proxy, 'https': proxy, 'ftp': proxy} proxy_connect = request.ProxyHandler(proxies) opener = request.build_opener(proxy_connect) request.install_opener(opener) def _collect_data(): try: print('\nAccessing to retrieve CVS informations.') request.urlretrieve(cvs_site, self.cvs_file) except error.URLError as e: exit('\033[1;31m[ERROR]\033[1;00m {0}\n'.format(e)) ... def some_function(self): _collect_data() ... 使其工作，并且一旦到达结尾，slideIndex将重置为一。

＆＃13;
＆＃13; 
setInterval
＆＃13; 
  var slideIndex = 1;
window.onload = function() {
  showSlides(slideIndex);
  setInterval(function() {
    showSlides(slideIndex);
    slideIndex++;
  }, 3000);
}

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";
}
＆＃13; 
.slideshow-container {
  position: relative;
  max-width: 90%;
  margin: auto;
  animation: 30s slidy infinite;
}
/* 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: 25px;
  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: white;
  font-size: 25px;
  padding: 8px 12px;
  position: absolute;
  bottom: 18px;
  width: 100%;
  text-align: center;
}
.textwbg {
  color: Black;
  font-size: 25px;
  padding: 8px 12px;
  position: absolute;
  bottom: 18px;
  width: 100%;
  text-align: center;
}
/* Number text (1/3 etc) */

.numbertext {
  color: #f2f2f2;
  font-size: 25px;
  padding: 8px 12px;
  position: absolute;
  top: 2;
}
/* The dots/bullets/indicators */

.dot {
  cursor: pointer;
  height: 13px;
  width: 13px;
  margin: 0 2px;
  background-color: #66b8ff;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}
.active,
.dot:hover {
  background-color: #555;
}
/* Fading animation */

.fade {
  -webkit-animation-name: fade;
  -webkit-animation-duration: 2s;
  animation-name: fade;
  animation-duration: 3s;
}
.nextbutton {
  position: relative;
}
＆＃13;
＆＃13;
＆＃13;

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