带有播放暂停和下一个上一个按钮的Javascript幻灯片

Question

I'm making a slideshow in Javascript with a Play / Pause and Next / Prev. 我正在用Javascript进行幻灯片播放，包括“播放/暂停”和“下一个/上一个”。 I have manage to slideshow working with play/pause button, but now i wanted to add Next and Prev button to it. 我可以使用“播放/暂停”按钮来进行幻灯片播放，但是现在我想向其添加“下一个”和“上一个”按钮。 Can some one please help me how can i do that. 有人可以帮我怎么做。

Here's my HTML: 这是我的HTML：

<!DOCTYPE html>
<html lang="en">
<head>
<title>Simple HTML Slideshow</title>

<style type="text/css">
#slideshow { 
    margin: 50px auto; 
    position: relative; 
    width: 900px;
    height: 450px;
    padding: 10px;  
}

#slideshow > div { 
    position: absolute; 
    top: 10px; 
    left: 10px; 
    right: 10px; 
    bottom: 10px; 
}

#slideshow > div > img { 
    width: 100%; 
}
#button { text-align: center; }
</style>
<noscript>
 Sorry...JavaScript is needed to go ahead.
</noscript>
</head>
<body>
<div id="slideshow">
   <div>
     <img name="slide" id="imgSlideshow" src="http://themarklee.com/wp-content/uploads/2013/12/snowying.jpg">
   </div>
</div>

<div id="button">
    <a href="#" id="prevBtn" onclick="showPrev()">Prev</a> 
    <a href="#" id="startCycle" onclick="setTimer()">Play/Pause</a> 
    <a href="#" id="nextBtn" onclick="showNext()">Next</a>
</div>

</body>
</html>

Here is JavaScript: 这是JavaScript：

<script language="javascript" type="text/javascript">
var i = 0; 
var path = new Array();
//var timer = setInterval("slide()",2000);
var timer;

// LIST OF IMAGES 
path[0] = "http://themarklee.com/wp-content/uploads/2013/12/snowying.jpg"; 
path[1] = "http://themarklee.com/wp-content/uploads/2013/12/starlight.jpg"; 
path[2] = "http://themarklee.com/wp-content/uploads/2013/12/snowstorm.jpg";
path[3] = "http://themarklee.com/wp-content/uploads/2013/12/misty-winter-afternoon.jpg";

function slide() {
    document.getElementById("imgSlideshow").src = path[i];
    i = (i + 1)%path.length;
    //console.log(i);
}

function setTimer(){
    if (timer) {
       // stop 
       clearInterval( timer );
       timer=null;
    }
    else {
       timer = setInterval("slide()",2000);
    }
}

var imgNumber = 1;
var numberOfImg = path.length;

function previousImage() {
  if(imgNumber > 1) {
    imgNumber--;
  }
  else {
    imgNumber = numberOfImg;
  }

  document.getElementById("imgSlideshow").src = path[imgNumber-1];
  changeCounter(imgNumber, numberOfImg);
}

function nextImage(){
  if(imgNumber < numberOfImg){
    imgNumber++
  }
  else{
    imgNumber = 1
  }

  document.getElementById("imgSlideshow").src = path[imgNumber-1];
  changeCounter(imgNumber, numberOfImg);
}

function changeCounter(cur, total) {
    document.getElementById("counter").innerHTML = cur + "/" + total;
}
document.getElementById("counter").innerHTML = 1 + "/" + path.length;
</script>

Any Help is appreciated and thanks in advance. 任何帮助表示赞赏，并在此先感谢。

Answer 1

Only minor changes in the logic. 逻辑上只有微小的变化。

 var imgNumber = 0; var path = ["http://themarklee.com/wp-content/uploads/2013/12/snowying.jpg", "http://themarklee.com/wp-content/uploads/2013/12/starlight.jpg", "http://themarklee.com/wp-content/uploads/2013/12/snowstorm.jpg", "http://themarklee.com/wp-content/uploads/2013/12/misty-winter-afternoon.jpg" ]; var numberOfImg = path.length; var timer = null; function slide() { imgNumber = (imgNumber + 1) % path.length; console.log(imgNumber); document.getElementById("imgSlideshow").src = path[imgNumber]; changeCounter(imgNumber + 1, numberOfImg); } function setTimer() { if (timer) { clearInterval(timer); timer = null; } else { timer = setInterval(slide, 2000); } return false; } function previousImage() { --imgNumber; if (imgNumber < 0) { imgNumber = numberOfImg - 1; } document.getElementById("imgSlideshow").src = path[imgNumber]; changeCounter(imgNumber + 1, numberOfImg); return false; } function nextImage() { ++imgNumber; if (imgNumber > (numberOfImg - 1)) { imgNumber = 0; } document.getElementById("imgSlideshow").src = path[imgNumber]; changeCounter(imgNumber + 1, numberOfImg); return false; } function changeCounter(cur, total) { document.getElementById("counter").innerHTML = cur + "/" + total; } document.getElementById("counter").innerHTML = 1 + "/" + path.length;

 #slideshow { margin: 50px auto; position: relative; width: 900px; height: 450px; padding: 10px; } #slideshow > div { position: absolute; top: 10px; left: 10px; right: 10px; bottom: 10px; } #slideshow > div > img { width: 100%; } #button { text-align: center; }

 <div id="slideshow"> <div> <img name="slide" id="imgSlideshow" src="http://themarklee.com/wp-content/uploads/2013/12/snowying.jpg"> </div> </div> <div id="button"> <a href="#" id="prevBtn" onclick="return previousImage()">Prev</a> <a href="#" id="startCycle" onclick="return setTimer()">Play/Pause</a> <a href="#" id="nextBtn" onclick="return nextImage()">Next</a> </div> <div id="counter"></div>

带有播放暂停和下一个上一个按钮的Javascript幻灯片

问题描述

1 个解决方案

解决方案1
1 已采纳 2016-02-11 06:00:19

带有播放暂停和下一个上一个按钮的Javascript幻灯片

问题描述

1 个解决方案

解决方案1 1 已采纳 2016-02-11 06:00:19

解决方案1
1 已采纳 2016-02-11 06:00:19