原生js模拟淘宝购物车项目实战

本文实例讲述了原生js模拟淘宝购物车实现代码。分享给大家供大家参考。具体如下：

通过JavaScript实现类似与淘宝的购物车效果，包括商品的单选、全选、删除、修改数量、价格计算、数目计算、预览等功能的实现。实现的效果图：

相应的代码：

shoppingCart.html

 
 
 
 


 

  

   

    
 全选
    
商品
    
单价
    
数量
    
小计
    
操作
   

  
  

   

    

    
Iphone 6S
    
5099.88
    

     -
     
     +
    
    
5099.88
    
删除
   
   

    

    
MacBook Air
    
1099.99
    

     -
     
     +
    
    
1099.99
    
删除
   
   

    

    
Ipad mini2 银16g WLAN7.9英寸
    
6599.00
    

     -
     
     +
    
    
6599.00
    
删除
   
   

    

    
IWatch EXTS Min
    
9998.68
    

     -
     
     +
    
    
9998.68
    
删除
   
  

 
 

   

    
   

   ..

 
 
  
   全选
  删除
  
结算
  
合计：￥ 0.00 
  
已购商品
   0件
   +++
   ---
  


 

shoppingCart.js

window.onload = function(){
 //低版本的IE浏览器不支持getElementByClassName方法，考虑兼容性,重写方法。
 if (!document.getElementByClassName) {
  document.getElementByClassName =function(cls){
   var ret = [];
   var clsElments = document.getElementsByTagName('*');
   for (var i = 0, len = clsElments.length; i < len; i++) {
    //考虑一个标签有多个class的情况,这里用正则表达式会好一点
    if (clsElments[i].className == cls 
     || (clsElments[i].className.indexOf(cls + " ") >= 0)
     || (clsElments[i].className.indexOf(" " + cls + " ") >= 0)
     || (clsElments[i].className.indexOf(" " + cls) >= 0)) 
    {
     ret.push(clsElments[i]);
    }
   }
   return ret;
  }

 }

 var cartTable = document.getElementById("cartTable");
 var tr = cartTable.children[1].rows; //table标签特有的属性，rows可以获得表格元素的所有tr行。
 var checkInput = document.getElementByClassName('check');//获得所有的单选框
 var checkAllInput = document.getElementByClassName('check_all');//获得所有的单选框
 var priceTotle = document.getElementById("priceTotle");//总价
 var selectTotle = document.getElementById("selectTotle");//已选商品
 var selected = document.getElementById("selected");
 var footer = document.getElementById("footer");//底部标签
 var selectedViewList = document.getElementById("selectedViewList");//底部标签
 var deleteAll = document.getElementById("deleteAll");



 //计算总价格和数量
 function getTotle(){
  var selectNum = 0;//数量
  var priceNum = 0;//价格
  var HTMLstr = ""; //缩略图的字符串拼接
  for (var i = 0,len = tr.length; i < len; i++) {
   if (tr[i].getElementsByTagName("input")[0].checked) {
    tr[i].className ="on";
    selectNum += parseInt(tr[i].getElementsByTagName("input")[1].value);
    priceNum += parseFloat(tr[i].cells[4].innerHTML);


    //拼接字符串显示已经选择的商品 
    HTMLstr += '
取消选择
';

   }
   else{
    tr[i].className = "";
   }
  }
  selectTotle.innerHTML = selectNum;
  priceTotle.innerHTML = priceNum.toFixed(2);//保留两位小数
  selectedViewList.innerHTML = HTMLstr;
 }

 //计算小计价格
 function getSubTotle(tr){
  var tds = tr.cells;
  var price = parseFloat(tds[2].innerHTML);
  var num = parseInt(tr.getElementsByTagName("input")[1].value);
  var subTotle = parseFloat(price * num).toFixed(2);
  tds[4].innerHTML = subTotle;
 }

 //复选框绑定单击事件
 for (var i = 0, len = checkInput.length; i < len; i++){
  checkInput[i].onclick =function (){
   //判断全选按钮，变更
   if (this.className == "check_all check") {
    for (var j = 0; j < len; j++){
     checkInput[j].checked = this.checked;
    }
   }
   if (this.checked == false) {
    for (var k = 0,len2 = checkAllInput.length; k < len2; k++){
     checkAllInput[k].checked = false;
    }
   }
   getTotle();
  }
 }



 //控制底部标签的显示
 selected.onclick = function(){
  if (footer.className == "footer") {
   footer.className == "footer show";
  } else {
   footer.className == "footer"; 
  }
 }


 //图片缩略图的取消选择按钮功能,e为事件对象
 selectedViewList.onclick = function(e){
  //兼容低版本的IE
/*  if (e){
   e = e;
  }else{
   e = window.event;
  } */
  var e = e || window.event;
  var el = e.srcElement;
  if (el.className == "del") {
   var index = el.getAttribute("index");
   var input = tr[index].getElementsByTagName("input")[0];
   input.checked = false;
   input.onclick();
  }
 }

 //实现加减、删除操作。同样用事件代理的方法实现
 for (var i = 0, len3 = tr.length; i < len3; i++){
  tr[i].onclick = function(e){
   var e = e || window.event;
   var el = e.srcElement;
   var clsName = el.className;
   var input = this.getElementsByTagName("input")[1];
   var inputValue = parseInt(input.value);
   var reduce = this.getElementsByTagName("span")[1];
   switch (clsName){
    case "add":
     /*parseInt(inputValue) ++;*/
     input.value = inputValue + 1;
     reduce.innerHTML ="-";
     getSubTotle(this);
     break;
    case "reduce":
     if(inputValue >= 1){
      input.value = inputValue - 1;
     }else{
      reduce.innerHTML ="";
     }
     getSubTotle(this);     
     break;
    case "delete":
     var conf = confirm("确定删除这个商品？");
     if (conf) {
      this.parentNode.removeChild(this);
     }
     break;
    default:
     break;
   }
   getTotle();
  }
  //处理从手动输入商品数量
  tr[i].getElementsByTagName("input")[1].onkeyup = function(){
   var val = this.value;
   var tr = this.parentNode.parentNode;
   if (isNaN(val) || val < 0 ) {
    val = 1;
   }
   this.value = val;
   getSubTotle(tr);
  }
 }

 //全选删除
 deleteAll.onclick = function(){
  if (selectTotle.innerHTML !="0") {
   var conf = confirm("确定删除这些商品？");
   if (conf) {
    for (var i = 0, len = tr.length; i < len; i++) {
     var input = tr[i].getElementsByTagName("input")[0];
     if(input.checked){
      tr[i].parentNode.removeChild(tr[i]);
     }
    }
   }
  }  
 }
}

//取消选择--采用事件代理---放到父元素上。

shoppingCart.css

.count_input{
 width: 39px;
 height: 15px;
 line-height: 15px;
 border: 1px solid #aaa;
 color: #343434;
 text-align: center;
 padding: 4px 0;
 background-color: #fff;
}

span.add, span.reduce{
 height: 23px;
 width: 27px;
 border: 1px solid #e5e5e5;
 background: #f0f0f0;
 line-height: 23px;
 color: #444;
}
.closing{
 display: inline-block;
 width: 120px;
 height: 50px;
 line-height: 50px;
 background: #f40;
 text-align: center;
 font-family: 'Microsoft Yahei';
 font-size: 20px;
 -webkit-border-radius: 2px;
 -moz-border-radius: 2px;
 -ms-border-radius: 2px;
 border-radius: 2px;
 text-decoration: none;
 cursor: pointer;
}
.fr{
 float: right;
}
.selected_totle, .selectAll, .select_all, .delete_all{
 margin-top: 15px;
}
.footer{
 height: 50px;
 background: #e5e5e5;
 font-family: 'Microsoft Yahei';
}
#selectTotle, #priceTotle,.subtotle {
 color: #f40;
 font-weight: 700;
 font-size: 18px;
 font-family: tohoma,arial;
 padding: 5px;

}

以上就是js模拟淘宝购物车的全部项目代码，欢迎大家学习品鉴，从中得到收获。