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实现需求:

实现一个简易的购物车,页面的表格展示data数据中的一个数组对象,并提供选中商品和全选商品checkbox复选框,页面实时显示选中商品的总金额:

 

分析:

1:使用v-for循环渲染arraylist对象;

2:使用computed计算属性计算总价;

3:使用computed计算全选复选框是否应该被选中(商品列表如果都被勾选,则设置全选复选框的状态为选中,否则设置全选复选框状态为取消选中);

4:根据数组中元素的初始选中状态,设置页面商品复选框是否选中。

 

代码实现:

使用html文件作为页面显示,引入js文件,Vue代码写在index.js中,页面样式保存在style.css中。

HTML:

 1 <!DOCTYPE html>
 2 <html>
 3     <head>
 4         <meta charset=utf-8>
 5         <title>Test page</title>
 6         <link rel="stylesheet" type="text/css" href="style.css">
 7     </head>
 8     <body>
 9         <div id="app" v-cloak>
10             <template v-if='list.length'>
11                 <table>
12                     <thead>
13                         <tr>
14                             <th>
15                                 <input type="checkbox" v-model="checkAll" :checked="checkAll" @change="handleCheckAll">选择
16                             </th>
17                             <th></th>
18                             <th>商品名称</th>
19                             <th>商品单价</th>
20                             <th>购买数量</th>
21                             <th>操作</th>
22                         </tr>
23                     </thead>
24                     <tbody>
25                         <tr v-for='(item, index) in list'>
26                             <td>
27                                 <input type="checkbox" v-model="item.checked" :checked="item.checked">
28                             </td>
29                             <td>{{index + 1}}</td>
30                             <td>{{item.name}}</td>
31                             <td>{{item.price}}</td>
32                             <td>
33                                 <button :disabled='item.count === 1' @click='handleReduce(index)'>-</button>
34                                 {{item.count}}
35                                 <button @click='handleAdd(index)'>+</button>
36                             </td>
37                             <td>
38                                 <button @click='handleRemove(index)'>移除</button>
39                             </td>
40                         </tr>
41                     </tbody>
42                 </table>
43                 <div>总价: {{totalPrice}}</div>
44             </template>
45             <div v-else>购物车为空</div>
46 
47         </div>
48         
49         <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
50         <script src="index.js"></script>
51     </body>
52 </html>
View Code

index.js

 1 var app = new Vue({
 2     el: '#app',
 3     data: {
 4         list: [
 5             {
 6                 id: 1,
 7                 name: 'iPhone 7',
 8                 price: 6188,
 9                 count: 1,
10                 checked: false
11             },
12             {
13                 id: 2,
14                 name: 'iPad Pro',
15                 price: 5888,
16                 count: 1,
17                 checked: true
18             },
19             {
20                 id: 3,
21                 name: 'Macbook Pro',
22                 price: 21488,
23                 count: 1,
24                 checked: false
25             }
26         ]
27     },
28     computed: {
29         totalPrice: function () {
30             var total = 0;
31             for (var i = 0; i < this.list.length; i++) {
32                 total += this.list[i].checked ? this.list[i].price * this.list[i].count : 0;
33             }
34             return total.toString().replace(/\B(?=(\d{3})+$)/g, ',');
35         },
36         checkAll: {
37             get() {
38                 var result = true;
39                 for (var i = 0; i < this.list.length; i++) {
40                     if (!this.list[i].checked)
41                         result = false;
42                 }
43                 return result;
44             },
45             set(val) {
46                 for (var i = 0; i < this.list.length; i++) {
47                     this.list[i].checked = val;
48                 }
49             }
50         }
51     },
52     methods: {
53         handleReduce: function (index) {
54             if (this.list[index].count === 1) return;
55             this.list[index].count--;
56         },
57 
58         handleAdd: function (index) {
59             this.list[index].count++;
60         },
61 
62         handleRemove: function (index) {
63             this.list.splice(index, 1);
64         },
65 
66         handleCheckAll: function () {
67             var setCheck = this.checkAll;
68             for (var i = 0; i < this.list.length; i++) {
69                 var tmpObj = this.list[i];
70                 tmpObj.checked = setCheck;
71                 this.$set(this.list, i, tmpObj);
72             }
73         }
74     }
75 })
View Code

style.css

 1 [v-cloak]{
 2     display: none;
 3 }
 4 
 5 table {
 6     border: 1px solid #e9e9e9;
 7     border-collapse: collapse;
 8     border-spacing: 0px;
 9     empty-cells: show;
10 }
11 
12 th, td{
13     padding: 8px 16px;
14     border: 1px solid #e9e9e9;
15     text-align: left;
16 }
17 
18 th{
19     background: #f7f7f7;
20     color: #5c6b77;
21     font-weight: 600;
22     white-space: nowrap;
23 }
View Code

 

posted on 2020-02-02 18:07  Rumble Zheng  阅读(4994)  评论(0编辑  收藏  举报