Native js simulation Taobao shopping cart project actual combat

The example in this article describes the native js simulation Taobao shopping cart implementation code. Share it with everyone for your reference. The details are as follows:

Achieve a shopping cart effect similar to Taobao through JavaScript, including the implementation of functions such as single selection, all selection, deletion, modification of quantity, price calculation, quantity calculation, preview, etc. of products. Realized renderings:

Corresponding code:

shoppingCart.html

<!DOCTYPE html>
<html>
<head>
 <meta charset = "UTF-8">
 <title>JavaScript实现购物车项目实战</title>
 <link rel="stylesheet" type="text/css" href="./css/shoppingCart.css">
 <script type="text/javascript" src="./js/shoppingCart.js"></script>
</head>
<body>
 <table id="cartTable">
  <thead>
   <tr class="order_content">
    <th><input class="check_all check" type="checkbox"></input> 全选</th>
    <th>商品</th>
    <th>单价</th>
    <th>数量</th>
    <th>小计</th>
    <th>操作</th>
   </tr>

  </thead>
  <tbody>
   <tr class="order_content">
    <td class="check"><input class = "check_one check" type="checkbox"></input></td>
    <td class="goods"><img src="./imgs/apple6s.png"><span>Iphone 6S</span></td>
    <td class="price">5099.88</td>
    <td class="count">
     <span class="reduce">-</span>
     <input class="count_input" type="text" value="1"></input>
     <span class="add">+</span>
    </td>
    <td class="subtotle">5099.88</td>
    <td class="operation"><span class="delete">删除<span></td>
   </tr>
   <tr class="order_content">
    <td class="check"><input class = "check_one check" type="checkbox"></input></td>
    <td class="goods"><img src="./imgs/macbook.png"><span>MacBook Air</span></td>
    <td class="price">1099.99</td>
    <td class="count">
     <span class="reduce">-</span>
     <input class="count_input" type="text" value="1"></input>
     <span class="add">+</span>
    </td>
    <td class="subtotle">1099.99</td>
    <td class="operation"><span class="delete">删除<span></td>
   </tr>
   <tr class="order_content">
    <td class="check"><input class = "check_one check" type="checkbox"></input></td>
    <td class="goods"><img src="./imgs/ipadmini.png"><span>Ipad mini2 银16g WLAN7.9英寸</span></td>
    <td class="price">6599.00</td>
    <td class="count">
     <span class="reduce">-</span>
     <input class="count_input" type="text" value="1"></input>
     <span class="add">+</span>
    </td>
    <td class="subtotle">6599.00</td>
    <td class="operation"><span class="delete">删除<span></td>
   </tr>
   <tr>
    <td class="check"><input class = "check_one check" type="checkbox"></input></td>
    <td class="goods"><img src="./imgs/applewatch.png"><span>IWatch EXTS Min</span></td>
    <td class="price">9998.68</td>
    <td class="count">
     <span class="reduce">-</span>
     <input class="count_input" type="text" value="1"></input>
     <span class="add">+</span>
    </td>
    <td class="subtotle">9998.68</td>
    <td class="operation"><span class="delete">删除<span></td>
   </tr>
  </tbody>

 </table>
 <div class="slected view">
   <div id="selectedViewList" class="clearfix">
    <!-- <div><img src="./imgs/applewatch.png"><span>取消选择</span></div> -->
   </div>

   <span class="arrow">.<span>.</span></span>

 </div>
 <div id = "footer" class="footer">  
  <label class="fl select_all" ><input class="check_all check" type="checkbox"> 全选</input></label>
  <a class="fl delete_all" id="deleteAll" href="javascript:;">删除</a>
  <div class="fr closing">结算</div>
  <div class="fr selected_totle">合计：￥ <span id="priceTotle">0.00</span> </div>
  <div class="fr selectAll" id="selected">已购商品
   <span id = "selectTotle">0</span>件
   <span class="arow up">+++</span>
   <span class="arow down">---</span>
  </div>


 </div>

</body>
</html>

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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 += '<div><img src="'+ tr[i].getElementsByTagName('img')[0].src +'"><span class ="del" index ="'+ i +'">取消选择</span></div>';

   }
   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。
<br />

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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;

}

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The above is the entire project code for js simulated Taobao shopping cart. Everyone is welcome to learn and appreciate it and gain something from it.

Native js simulation Taobao shopping cart project actual combat_javascript skills