原生js模擬淘寶購物車項目實戰

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原生js模擬淘寶購物車項目實戰

編輯：關於JavaScript

本文實例講述了原生js模擬淘寶購物車實現代碼。分享給大家供大家參考。具體如下：

通過JavaScript實現類似與淘寶的購物車效果，包括商品的單選、全選、刪除、修改數量、價格計算、數目計算、預覽等功能的實現。實現的效果圖：

相應的代碼：

shoppingCart.html

<!DOCTYPE html>
<html>
<head>
 <meta charset = "UTF-8">
 <title>JavaScript實現購物車項目實戰</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> 全選</th>
    <th>商品</th>
    <th>單價</th>
    <th>數量</th>
    <th>小計</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">刪除<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">刪除<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 銀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">刪除<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">刪除<span></td>
   </tr>
  </tbody>

 </table>
 <div class="slected view">
   <div id="selectedViewList" class="clearfix">
    <!-- <div><img src="./imgs/applewatch.png"><span>取消選擇</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"> 全選</input></label>
  <a class="fl delete_all" id="deleteAll" href="javascript:;">刪除</a>
  <div class="fr closing">結算</div>
  <div class="fr selected_totle">合計：￥ <span id="priceTotle">0.00</span> </div>
  <div class="fr selectAll" id="selected">已購商品
   <span id = "selectTotle">0</span>件
   <span class="arow up">+++</span>
   <span class="arow down">---</span>
  </div>


 </div>

</body>
</html>

shoppingCart.js

window.onload = function(){
 //低版本的IE浏覽器不支持getElementByClassName方法，考慮兼容性,重寫方法。
 if (!document.getElementByClassName) {
  document.getElementByClassName =function(cls){
   var ret = [];
   var clsElments = document.getElementsByTagName('*');
   for (var i = 0, len = clsElments.length; i < len; i++) {
    //考慮一個標簽有多個class的情況,這裡用正則表達式會好一點
    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標簽特有的屬性，rows可以獲得表格元素的所有tr行。
 var checkInput = document.getElementByClassName('check');//獲得所有的單選框
 var checkAllInput = document.getElementByClassName('check_all');//獲得所有的單選框
 var priceTotle = document.getElementById("priceTotle");//總價
 var selectTotle = document.getElementById("selectTotle");//已選商品
 var selected = document.getElementById("selected");
 var footer = document.getElementById("footer");//底部標簽
 var selectedViewList = document.getElementById("selectedViewList");//底部標簽
 var deleteAll = document.getElementById("deleteAll");



 //計算總價格和數量
 function getTotle(){
  var selectNum = 0;//數量
  var priceNum = 0;//價格
  var HTMLstr = ""; //縮略圖的字符串拼接
  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);


    //拼接字符串顯示已經選擇的商品 
    HTMLstr += '<div><img src="'+ tr[i].getElementsByTagName('img')[0].src +'"><span class ="del" index ="'+ i +'">取消選擇</span></div>';

   }
   else{
    tr[i].className = "";
   }
  }
  selectTotle.innerHTML = selectNum;
  priceTotle.innerHTML = priceNum.toFixed(2);//保留兩位小數
  selectedViewList.innerHTML = HTMLstr;
 }

 //計算小計價格
 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;
 }

 //復選框綁定單擊事件
 for (var i = 0, len = checkInput.length; i < len; i++){
  checkInput[i].onclick =function (){
   //判斷全選按鈕，變更
   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();
  }
 }



 //控制底部標簽的顯示
 selected.onclick = function(){
  if (footer.className == "footer") {
   footer.className == "footer show";
  } else {
   footer.className == "footer"; 
  }
 }


 //圖片縮略圖的取消選擇按鈕功能,e為事件對象
 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();
  }
 }

 //實現加減、刪除操作。同樣用事件代理的方法實現
 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("確定刪除這個商品？");
     if (conf) {
      this.parentNode.removeChild(this);
     }
     break;
    default:
     break;
   }
   getTotle();
  }
  //處理從手動輸入商品數量
  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);
  }
 }

 //全選刪除
 deleteAll.onclick = function(){
  if (selectTotle.innerHTML !="0") {
   var conf = confirm("確定刪除這些商品？");
   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]);
     }
    }
   }
  }  
 }
}

//取消選擇--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模擬淘寶購物車的全部項目代碼，歡迎大家學習品鑒，從中得到收獲。

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