Simple drag-and-drop shopping cart function implemented in JS
This article mainly introduces the simple drag-and-drop shopping cart function implemented in JS, involving implementation techniques related to javascript event response and dynamic operation of page elements. It also comes with a complete example source code for readers to download and refer to. Friends who need it can refer to it. I hope it can help. to everyone.
The example in this article describes the simple drag-and-drop shopping cart function implemented in JS. Share it with everyone for your reference, the details are as follows:
<html>
<head>
<meta charset="utf-8" />
<title>使用拖放API将商品拖入购物车</title>
<style>
body {
font-size:12px
}
.liT{
border-bottom:solid 1px #ccc;
background-color:#eee;
font-weight:bold
}
.liF{
float:left;
margin-right:5px;
}
ul{
list-style-type:none;
padding:0px;
height:106px;
width:330px
}
ul li{
height:23px
}
ul li img{
width:68px;
height:96px;
border:solid 1px #ccc;
padding:3px
}
ul li span{
float:left;
width:70px;
padding:5px;
}
</style>
<script type="text/javascript">
function $$(id) {
return document.getElementById(id);
}
//自定义页面加载时调用的函数
function pageload() {
//获取全部的图书商品
var Drag = document.getElementsByTagName("img");
//遍历每一个图书商品
for (var intI = 0; intI < Drag.length; intI++) {
//为每一个商品添加被拖放元素的dragstart事件
Drag[intI].addEventListener("dragstart",
function(e) {
var objDtf = e.dataTransfer;
objDtf.setData("text/html", addCart(this.title, this.alt, 1));
},
true);
}
var Cart = $$("ulCart");
//添加目标元素的drop事件
Cart.addEventListener("drop",
function(e) {
var objDtf = e.dataTransfer;
var strHTML = objDtf.getData("text/html");
var num=top_();
Cart.innerHTML += strHTML;
document.getElementById("num").innerHTML=num;
var price =document.getElementById("price").innerHTML;
document.getElementById("sum").innerHTML=num*price;
e.preventDefault();
e.stopPropagation();
},
false);
}
//添加页面的dragover事件
document.ondragover = function(e) {
//阻止默认方法,取消拒绝被拖放
e.preventDefault();
}
//添加页面drop事件
document.ondrop = function(e) {
//阻止默认方法,取消拒绝被拖放
e.preventDefault();
}
//自定义向购物车中添加记录的函数
function addCart(a, b, c) {
var strHTML = "<li class='liC'>";
strHTML += "<span>" + a + "</span>";
strHTML += "<span id=\"price\">" + b + "</span>";
strHTML += "<span id=\"num\">" + c + "</span>";
strHTML += "<span id=\"sum\">" + b * c + "</span>";
strHTML += "</li>";
return strHTML;
}
//提示输入框
function top_(){
var str=prompt("请输入要购买的数量",1);
return str;
}
</script>
</head>
<body onLoad="pageload();">
<ul>
<li class="liF">
<img src="images/img02.jpg" id="img02"
alt="42" title="2006作品" draggable="true">
</li>
<li class="liF">
<img src="images/img03.jpg" id="img03"
alt="56" title="2008作品" draggable="true">
</li>
<li class="liF">
<img src="images/2.jpg" id="img04"
alt="52" title="2010作品" draggable="true">
</li>
<li class="liF">
<img src="images/1.jpg" id="img05"
alt="59" title="2011作品" draggable="true">
</li>
</ul>
<ul id="ulCart">
<li class="liT">
<span>书名</span>
<span>定价</span>
<span>数量</span>
<span>总价</span>
</li>
</ul>
</body>
</html>Running effect:
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