微信小程序下拉框组件

Posted 2022-03-02 muphy

》》下拉组件

1.组件结构：

2.index.js：

 1 //index.js
 2 Component(
 3   /**
 4    * 组件的属性列表
 5    */
 6   properties: 
 7     propArray: 
 8       type: Array,
 9     
10   ,
11   /**
12    * 组件的初始数据
13    */
14   data: 
15     selectShow: false,//初始option不显示
16     selectText: "请选择",//初始内容
17   ,
18   /**
19    * 组件的方法列表
20    */
21   methods: 
22     //option的显示与否
23     selectToggle: function () 
24       var nowShow = this.data.selectShow;//获取当前option显示的状态
25 
26       this.setData(
27         selectShow: !nowShow
28       )
29     ,
30     //设置内容
31     setText: function (e) 
32       var nowData = this.properties.propArray;//当前option的数据是引入组件的页面传过来的，所以这里获取数据只有通过this.properties
33       var nowIdx = e.target.dataset.index;//当前点击的索引
34       var nowText = nowData[nowIdx].text || nowData[nowIdx].value || nowData[nowIdx];//当前点击的内容
35       //再次执行动画，注意这里一定，一定，一定是this.animation来使用动画
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(引用组件的页面)：

1.pindex.js:

 1 Page(
 2 
 3   /**
 4    * 页面的初始数据
 5    */
 6   data: 
 7     selectArray: [
 8       "id": "10",
 9       "value": "会计类"
10     , 
11       "id": "21",
12       "text": "工程类"
13     , ‘技术类‘, ‘value‘: ‘其他‘]
14   ,
15 
16   select: function(e) 
17     console.log(e.detail)
18   
19 
20 )

2.pindex.json:

1 
2   "navigationBarTitleText":"下拉测试",
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">类型：</view>
3     <view class="weui-cell__bd">
4       <single-dropdown-select prop-array=‘selectArray‘  bind:select=‘select‘ />
6     </view>
7   </view>

 4.效果图：