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How to achieve image switching animation effect in javascript (code)

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Aug 23, 2018 am 11:26 AM

Picture switching

The content of this article is about how to achieve the animation effect (code) of image switching in JavaScript. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

First of all, the rendering is roughly like this. Click the button on the left to switch pictures.

It seems quite simple, but there are still several difficulties, so I will pick this case out and analyze it carefully.

Step One: Layout

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>图片切换器</title>
	</head>
	<style type="text/css">
		*{
			margin: 0;
			padding: 0;
		}
		body{
			background-color: RGB(123,113,104);
		}
		#pic{
			width: 300px;
			height: 400px;
			position: relative;
			margin: 50px auto;
		}
		#pic img{
			width: 300px;
			height: 400px;
		}
		#pic span,#pic p{
			position: absolute;
			width: 300px;
			height: 30px;
			line-height: 30px;
			text-align: center;
			background-color: rgba(61,50,48,0.5);
		}
		#pic span{
			top: 0px;
		}
		#pic p{
			bottom: 0px;
		}
		#pic ul{
			position: absolute;
			top:0px;
			left: 320px;
		}
		#pic li{
			list-style: none;
			width: 40px;
			height: 40px;
			background-color: #333;
			margin-bottom:10px ;
		}
		#pic li.active{
			background-color: #F2F2F2;
		}
		
	</style>
	<body>
		<p id="pic">
			<img src="img/1.jpeg"/>
			<span>- / -</span>
			<p>图片描述正在加载中...</p>
			<ul>
				<li class="active"></li>
				<li></li>
				<li></li>
				<li></li>
				<li></li>
				
			</ul>
		</p>
	</body>
</html>

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Step Two: Data and Initialization

1) Find the data

2) Initialize the page

	<script type="text/javascript">
		window.onload = function(){
			var op = document.getElementById("pic");
			var oImg = op.getElementsByTagName(&#39;img&#39;)[0];
			var oSpan = op.getElementsByTagName(&#39;span&#39;)[0];
			var oP = op.getElementsByTagName(&#39;p&#39;)[0];
			var oUl = op.getElementsByTagName(&#39;ul&#39;)[0];
			
			var arrSrc = [&#39;img/1.jpeg&#39;,&#39;img/2.jpg&#39;,&#39;img/3.jpg&#39;,&#39;img/4.jpg&#39;,&#39;img/5.jpg&#39;];
			var arrText = [&#39;图片描述：第一张&#39;,&#39;图片描述：第二张&#39;,&#39;图片描述：第三张&#39;,&#39;图片描述：第四张&#39;,&#39;图片描述：第五张&#39;];
			
			//一般有数组就需要一个值
			var num = 0;
			
			//初始化
			oSpan.innerHTML = num+1 +" / "+ arrSrc.length;
			oImg.src = arrSrc[num];
			oP.innerHTML = arrText[num];
			for(var i=0;i<arrSrc.length;i++){
				oUl.innerHTML += &#39;<li></li>&#39;;
			}
			
		}
	</script>

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Step 3: Switch the picture. So far, the function of switching pictures and displaying text has been realized, but the effect of the ul next to it has not been realized yet

var oLi = oUl.getElementsByTagName(&#39;li&#39;);

//切换图片
			for(var i=0;i<arrSrc.length;i++){
				//自定义属性，一一对应
				oLi[i].index = i;
				oLi[i].onclick = function(){
					var id = this.index;
					//通过自定义的属性设置对应的信息
					oImg.src = arrSrc[id];
					oP.innerHTML = arrText[id];
					oSpan.innerHTML = id+1 +" / "+ arrSrc.length;
				}
			}

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Step 4: Implement the class style of li addition.

Idea 1:

Clear all li styles and add them to whichever one you click.

var oldLi = 0;

//初始化
oLi[oldLi].className = &#39;active&#39;;

//在点击事件中
//循环将class清空
			for(var j=0;j<arrSrc.length;j++){
				oLi[j].className = "";					
			}
			oLi[id].className = "active";

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Idea 2:

Clear the previous one, currently add

Define a variable, oldLi stores the previous value clicked

The default is 0

When we click the next one, the one that will be 0 (default) will be cleared.

And record the index custom attribute oldLi of the currently clicked li = this.index;

Then set the class attribute of the current li

oLi[oldLi].className = &#39;&#39;;
					oldLi = id;
					this.className = &#39;active&#39;;

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Completed;

Post the complete code and screenshots below

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>图片切换器</title>
    </head>
    <style type="text/css">
        *{
            margin: 0;
            padding: 0;
        }
        body{
            background-color: RGB(123,113,104);
        }
        #pic{
            width: 300px;
            height: 400px;
            position: relative;
            margin: 50px auto;
        }
        #pic img{
            width: 300px;
            height: 400px;
            border-radius:10px;
        }
        #pic span,#pic p{
            position: absolute;
            width: 300px;
            height: 30px;
            line-height: 30px;
            text-align: center;
            background-color: rgba(61,50,48,0.5);
        }
        #pic span{
            top: 0px;
            border-radius:10px 10px 0 0;
        }
        #pic p{
            bottom: 0px;
            border-radius: 0 0 10px 10px;
        }
        #pic ul{
            position: absolute;
            top:0px;
            left: 320px;
        }
        #pic li{
            list-style: none;
            width: 40px;
            height: 40px;
            background-color: #333;
            margin-bottom:10px ;
            border-radius: 10px;
        }
        #pic li.active{
            background-color: #F2F2F2;
        }
    </style>
    <script type="text/javascript">
        window.onload = function(){
            var oDiv = document.getElementById("pic");
            var oImg = oDiv.getElementsByTagName(&#39;img&#39;)[0];
            var oSpan = oDiv.getElementsByTagName(&#39;span&#39;)[0];
            var oP = oDiv.getElementsByTagName(&#39;p&#39;)[0];
            var oUl = oDiv.getElementsByTagName(&#39;ul&#39;)[0];
            var oLi = oUl.getElementsByTagName(&#39;li&#39;);
            
            var arrSrc = [&#39;img/1.jpeg&#39;,&#39;img/2.jpg&#39;,&#39;img/3.jpg&#39;,&#39;img/4.jpg&#39;,&#39;img/5.jpg&#39;];
            var arrText = [&#39;图片描述：第一张&#39;,&#39;图片描述：第二张&#39;,&#39;图片描述：第三张&#39;,&#39;图片描述：第四张&#39;,&#39;图片描述：第五张&#39;];
            
            //一般有数组就需要一个值
            var num = 0;
            var oldLi = 0;
            
            //初始化
            oSpan.innerHTML = num+1 +" / "+ arrSrc.length;
            oImg.src = arrSrc[num];
            oP.innerHTML = arrText[num];
            for(var i=0;i<arrSrc.length;i++){
                oUl.innerHTML += &#39;<li></li>&#39;;
            }
            oLi[oldLi].className = &#39;active&#39;;
            
            
            //切换图片
            for(var i=0;i<arrSrc.length;i++){
                //自定义属性，一一对应
                oLi[i].index = i;
                oLi[i].onclick = function(){
                    var id = this.index;
                    //通过自定义的属性设置对应的信息
                    oImg.src = arrSrc[id];
                    oP.innerHTML = arrText[id];
                    oSpan.innerHTML = id+1 +" / "+ arrSrc.length;
                    
                    oLi[oldLi].className = &#39;&#39;;
                    oldLi = id;
                    this.className = &#39;active&#39;;
                }
            }
            
        }
    </script>
    <body>
        <div id="pic">
            <img src="img/1.jpeg"/>
            <span>- / -</span>
            <p>图片描述正在加载中...</p>
            <ul>
                <!--<li class="active"></li>-->
            </ul>
        </div>
    </body>
</html>

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