微信小程序下拉框组件

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》》下拉组件

1.组件结构：

2.index.js：

//index.js
Component({
/**
* 组件的属性列表
*/
properties: {
propArray: {
type: Array,
}
},
/**
* 组件的初始数据
*/
data: {
selectShow: false,//初始option不显示
selectText: "请选择",//初始内容
},
/**
* 组件的方法列表
*/
methods: {
//option的显示与否
selectToggle: function () {
var nowShow = this.data.selectShow;//获取当前option显示的状态 this.setData({
selectShow: !nowShow
})
},
//设置内容
setText: function (e) {
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
var nowIdx = e.target.dataset.index;//当前点击的索引
var nowText = nowData[nowIdx].text || nowData[nowIdx].value || nowData[nowIdx];//当前点击的内容
//再次执行动画，注意这里一定，一定，一定是this.animation来使用动画
this.setData({
selectShow: false,
selectText: nowText,
})
this.triggerEvent('select', nowData[nowIdx])
}
}
})

3.index.json:

{
"component": true,
"usingComponents": {}
}

4.index.wxml:

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

5.index.wxss:

/* components/single-dropdown-select/index.wxss */ .ms-content-box {
width: 120px;
} .ms-content {
border: 1px solid #e2e2e2;
background: white;
font-size: 16px;
position: relative;
height: 30px;
line-height: 30px;
} .ms-text {
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
padding: 0 40px 0 6px;
font-size: 14px;
} .ms-options {
background: white;
width: inherit;
position: absolute;
border: 1px solid #e2e2e2;
border-top: none;
box-sizing: border-box;
z-index:;
max-height: 120px;
overflow: auto;
} .ms-option {
height: 30px;
line-height: 30px;
border-top: 1px solid #e2e2e2;
padding: 0 6px;
text-align: left;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
font-size: 14px;
} .ms-item:first-child {
border-top: none;
} .icon-right, .icon-down, .icon-up {
display: inline-block;
padding-right: 13rpx;
position: absolute;
right: 20rpx;
top: 10rpx;
} .icon-right::after, .icon-down::after, .icon-up::after {
content: "";
display: inline-block;
position: relative;
bottom: 2rpx;
margin-left: 10rpx;
height: 10px;
width: 10px;
border: solid #bbb;
border-width: 2px 2px 0 0;
} .icon-right::after {
-webkit-transform: rotate(45deg);
transform: rotate(45deg);
} .icon-down::after {
bottom: 14rpx;
-webkit-transform: rotate(135deg);
transform: rotate(135deg);
} .icon-up::after {
bottom: 0rpx;
-webkit-transform: rotate(-45deg);
transform: rotate(-45deg);
}

》》使用方式(引用组件的页面)：

1.pindex.js:

Page({ /**
* 页面的初始数据
*/
data: {
selectArray: [{
"id": "10",
"value": "会计类"
}, {
"id": "21",
"text": "工程类"
}, '技术类', {'value': '其他'}]
}, select: function(e) {
console.log(e.detail)
} })

2.pindex.json:

{
"navigationBarTitleText":"下拉测试",
"usingComponents": {
"single-dropdown-select": "/components/single-dropdown-select/index"
}
}

3.pindex.wxml:

4.效果图：