微信小程序下拉框組件

》》下拉組件

1.組件結構：

2.index.js：

 1 //index.js
 2 Component({
 3   /**
 4    * 組件的屬性列表
 5    */
 6   properties: {
 7     propArray: {
 8       type: Array,
 9     }
10   },
11   /**
12    * 組件的初始數據
13    */
14   data: {
15     selectShow: false,//初始option不顯示
16     selectText: "請選擇",//初始內容
17   },
18   /**
19    * 組件的方法列表
20    */
21   methods: {
22     //option的顯示與否
23     selectToggle: function () {
24       var nowShow = this.data.selectShow;//獲取當前option顯示的狀態
25 
26       this.setData({
27         selectShow: !nowShow
28       })
29     },
30     //設置內容
31     setText: function (e) {
32       var nowData = this.properties.propArray;//當前option的數據是引入組件的頁面傳過來的，因此這裏獲取數據只有經過this.properties
33       var nowIdx = e.target.dataset.index;//當前點擊的索引
34       var nowText = nowData[nowIdx].text || nowData[nowIdx].value || nowData[nowIdx];//當前點擊的內容
35       //再次執行動畫，注意這裏必定，必定，必定是this.animation來使用動畫
36       this.setData({
37         selectShow: false,
38         selectText: nowText,
39       })
40       this.triggerEvent('select', nowData[nowIdx])
41     }
42   }
43 })

3.index.json:

1 {
2   "component": true,
3   "usingComponents": {}
4 }

4.index.wxml:

1 <view class='ms-content-box'>
2     <view class='ms-content' bindtap='selectToggle'>
3         <view class='ms-text'>{{selectText}}</view>
4          <view class="{{selectShow ? 'icon-up' : 'icon-down'}}"></view>
5     </view>
6     <view class='ms-options' wx:if="{{selectShow}}">
7         <view wx:for="{{propArray}}" data-index="{{index}}" wx:key='index' class='ms-option' bindtap='setText'>{{item.text || item.value || item}}</view>
8     </view>
9 </view>

5.index.wxss:

 1 /* components/single-dropdown-select/index.wxss */
 2 
 3 .ms-content-box {
 4   width: 120px;
 5 }
 6 
 7 .ms-content {
 8   border: 1px solid #e2e2e2;
 9   background: white;
10   font-size: 16px;
11   position: relative;
12   height: 30px;
13   line-height: 30px;
14 }
15 
16 .ms-text {
17   overflow: hidden;
18   text-overflow: ellipsis;
19   white-space: nowrap;
20   padding: 0 40px 0 6px;
21   font-size: 14px;
22 }
23 
24 .ms-options {
25   background: white;
26   width: inherit;
27   position: absolute;
28   border: 1px solid #e2e2e2;
29   border-top: none;
30   box-sizing: border-box;
31   z-index: 3;
32   max-height: 120px;
33   overflow: auto;
34 }
35 
36 .ms-option {
37   height: 30px;
38   line-height: 30px;
39   border-top: 1px solid #e2e2e2;
40   padding: 0 6px;
41   text-align: left;
42   overflow: hidden;
43   text-overflow: ellipsis;
44   white-space: nowrap;
45   font-size: 14px;
46 }
47 
48 .ms-item:first-child {
49   border-top: none;
50 }
51 
52 .icon-right, .icon-down, .icon-up {
53   display: inline-block;
54   padding-right: 13rpx;
55   position: absolute;
56   right: 20rpx;
57   top: 10rpx;
58 }
59 
60 .icon-right::after, .icon-down::after, .icon-up::after {
61   content: "";
62   display: inline-block;
63   position: relative;
64   bottom: 2rpx;
65   margin-left: 10rpx;
66   height: 10px;
67   width: 10px;
68   border: solid #bbb;
69   border-width: 2px 2px 0 0;
70 }
71 
72 .icon-right::after {
73   -webkit-transform: rotate(45deg);
74   transform: rotate(45deg);
75 }
76 
77 .icon-down::after {
78   bottom: 14rpx;
79   -webkit-transform: rotate(135deg);
80   transform: rotate(135deg);
81 }
82 
83 .icon-up::after {
84   bottom: 0rpx;
85   -webkit-transform: rotate(-45deg);
86   transform: rotate(-45deg);
87 }

 

》》使用方式(引用組件的頁面)：

1.pindex.js:

 1 Page({
 2 
 3   /**
 4    * 頁面的初始數據
 5    */
 6   data: {
 7     selectArray: [{
 8       "id": "10",
 9       "value": "會計類"
10     }, {
11       "id": "21",
12       "text": "工程類"
13     }, '技術類', {'value': '其餘'}]
14   },
15 
16   select: function(e) {
17     console.log(e.detail)
18   }
19 
20 })

2.pindex.json:

1 {
2   "navigationBarTitleText":"下拉測試",
3   "usingComponents": {
4     "single-dropdown-select": "/components/single-dropdown-select/index"
5   }
6 }

3.pindex.wxml:

1 <view class="weui-cell">
2     <view class="weui-cell__hd">類型：</view>
3     <view class="weui-cell__bd">
4       <single-dropdown-select prop-array='{{selectArray}}'  bind:select='select' />
6     </view>
7   </view>

 4.效果圖：