jQuery与Bootstrap 3实现购物车前端交互开发详解

<!DOCTYPE html>
<html>
<HEADER>
 <meta charset="UTF-8">
 <title>Shopping Cart</title>
 <script type="text/javascript" src="jquery-1.11.min.js"></script>
 <script type="text/javascript" src="demo.js"></script>
 <link href="bootstrap.min.css" media="screen" rel="stylesheet" type="text/css" />
</HEADER>
<body class="container">
 <table id="cartTable" class="cart table table-condensed" >
 <thead>
 <tr>
 <th style="width:60px;"><label><input class="check-all check" type="checkbox" /> 全选</label></th>
 <th><label>产品型号</label></th>
 <th style="width:100px;"><label>单价</label></th>
 <th style="width:120px;"><label>数量</label></th>
 <th style="width:100px;"><label>小计</label></th>
 <th style="width:40px;"><label>操作</label></th> 
 </tr>
 </thead>
 <tbody>
 <tr >
 <td ><input class="check-one check" type="checkbox" /> </td>
 <td class="goods">
  <label>Item 1</label>
 </td>
 <td class="number small-bold-red"><span>76.55</span></td>
 <td class="input-group">
  <span class="input-group-addon minus">-</span>
  <input type="text" class="number form-control input-sm" value="10" />
  <span class="input-group-addon plus">+</span>
 </td>
 <td class="subtotal number small-bold-red">101</td>
 <td class="operation"><span class="delete btn btn-xs btn-primary">删除</span></td>
 </tr>
 <tr>
 <td ><input class="check-one check" type="checkbox" /></td>
 <td class="goods">
  <label>Item 2</label>
 </td>
 <td class="number small-bold-red"><span>1100</span></td>
 <td class="input-group">
  <span class="input-group-addon minus">-</span>
  <input type="text" class="number form-control input-sm" value="1" />
  <span class="input-group-addon plus">+</span>
 </td>
 <td class="subtotal number small-bold-red">352</td>
 <td class="operation"><span class="delete btn btn-xs btn-primary">删除</span></td>
 </tr>
 <tr>
 <td ><input class="check-one check" type="checkbox" /></td>
 <td class="goods">
  <label>Item 3</label>
 </td>
 <td class="number small-bold-red"><span>1200</span></td>
 <td class="input-group">
  <span class="input-group-addon minus">-</span>
  <input type="text" class="number form-control input-sm" value="1" />
  <span class="input-group-addon plus">+</span>
 </td>
 <td class="subtotal number small-bold-red">9876.55</td>
 <td class="operation"><span class="delete btn btn-xs btn-primary">删除</span></td>
 </tr>
 <tr>
 <td ><input class="check-one check" type="checkbox" /></td>
 <td class="goods">
  <label>Item 4</label>
 </td>
 <td class="number small-bold-red"><span>1400</span></td>
 <td class="input-group">
  <span class="input-group-addon minus">-</span>
  <input type="text" class="number form-control input-sm" value="1" />
  <span class="input-group-addon plus">+</span>
 </td>
 <td class="subtotal number small-bold-red">9876.55</td>
 <td class="operation"><span class="delete btn btn-xs btn-primary">删除</span></td>
 </tr>
 </tbody>
 </table>

 <div class="row">
 <div class="col-md-12 col-lg-12 col-sm-12">
 <div style="border-top:1px solid gray;padding:4px 10px;">
 <div style="margin-left:20px;" class="pull-right total">
  <label>金额合计:<span class="currency">￥</span><span id="priceTotal" class="large-bold-red">0.00</span></label>
 </div>
 <div class="pull-right">
  <label>您选择了<span id="itemCount" class="large-bold-red" style="margin:0 4px;"></span>种产品型号，共计<span id="qtyCount" class="large-bold-red" style="margin:0 4px;"></span>件</label>
 </div>
 <div class="pull-right selected" id="selected">
  <span id="selectedTotal"></span>
 </div>
 </div>
 </div>
 </div>
</body>
</html>

全选功能与checkbox处理

$(cartTable).find(":checkbox").click(function() {
  //全选框单击
  if ($(this).hasClass("check-all")) {
   var checked = $(this).prop("checked");
   $(cartTable).find(".check-one").prop("checked", checked);
  }

  //如果手工一个一个的点选了所有勾选框，需要自动将“全选”勾上或是取消
  var items = cartTable.find("tr:gt(0)");
  $(cartTable).find(".check-all").prop("checked", items.find(":checkbox:checked").length == items.length);

  getTotal();
 });

商品小计计算逻辑

 /*
  * 计算购物车中每一个产品行的金额小计
  *
  * 参数 row 购物车表格中的行元素tr
  *
  */
 function getSubTotal(row) {
 var price = parseFloat($(row).find("span:first").text()); //获取单价
  var qty = parseInt($(row).find(":text").val()); //获取数量
  var result = price * qty; //计算金额小计
  $(row).find(".subtotal").text(result.toFixed(2)); //将计算好的金额小计写入到“小计”栏位中
 };

购物车汇总信息计算

 /*
  * 计算购物车中产品的累计金额
  *
  *
  */
 function getTotal() {
 var qtyTotal = 0;
  var itemCount = 0;
  var priceTotal = 0;
  $(cartTable).find("tr:gt(0)").each(function() {
  if ($(this).find(":checkbox").prop("checked") == true) { //如果选中
    itemCount++; //累加产品品种数量
    qtyTotal += parseInt($(this).find(":text").val()); //累计产品购买数量
    priceTotal += parseFloat($(this).find(".subtotal").text()); //累计产品金额
   }
  });    $("#itemCount").text(itemCount);
  $("#qtyCount").text(qtyTotal);
 $("#priceTotal").text(priceTotal.toFixed(2));
 };

数量调整与删除交互

//为数量调整的＋ －号提供单击事件，并重新计算产品小计
 /*
  * 为购物车中每一行绑定单击事件，以及每行中的输入框绑定键盘事件
  * 根据触发事件的元素执行不同动作
  * 增加数量
  * 减少数量
  * 删除产品
  *
  */
 $(cartTable).find("tr:gt(0)").each(function() {
 var input = $(this).find(":text"); 
 //为数量输入框添加事件，计算金额小计，并更新总计
 $(input).keyup(function() {
 var val = parseInt($(this).val());
 if (isNaN(val) || (val < 1)) { $(this).val("1"); }
  getSubTotal($(this).parent().parent()); //tr element
  getTotal();
 });

 //为数量调整按钮、删除添加单击事件，计算金额小计，并更新总计
 $(this).click(function() {
 var val = parseInt($(input).val());
 if (isNaN(val) || (val < 1)) { val = 1; }

 if ($(window.event.srcElement).hasClass("minus")) {
   if (val > 1) val--;
   input.val(val);
   getSubTotal(this);
  }
  else if ($(window.event.srcElement).hasClass("plus")) {
   if (val < 9999) val++;
  input.val(val);
 getSubTotal(this);
  }
  else if ($(window.event.srcElement).hasClass("delete")) {
   if (confirm("确定要从购物车中删除此产品？")) {
    $(this).remove();
 }
  }
   getTotal();
 });