1.首先在components 里面设置组件名称:van-select(随便取名字);
2.新建文件写代码:
wxml:
html
<view class="w100 select_all_view">
<!-- 标题,可以没有 -->
<view class="mr-10 pt-10 size-28" style="width: {{titleWidth}};" wx:if="{{title}}">{{title}}</view>
<view class="select_view relative" style="width: {{title ? 'calc(100% - ' + titleWidth + ' - 10rpx)' : '100%'}};max-width: {{title ? 'calc(100% - ' + titleWidth + ' - 10rpx)' : '100%'}};">
<view class="inputPlaceholder h100 w100 radius-10 relative flex_l pd-10 {{ disabled ? 'gray-3' : 'black' }}" bindtap="{{disabled || readonly ? '' : 'changeShow'}}" style="background: {{disabled ?'#f5f7fa' : bgColor}};border: 2rpx solid #ddd;">
<block wx:if="{{disabled || readonly}}">
<view class="flex-1" wx:if="{{selectLabel}}">{{selectLabel}}</view>
<view class="flex-1 gray-3 line-1" wx:else>{{placeholder}}</view>
<van-icon class="gray-3" name="arrow-down" />
</block>
<block wx:else>
<block wx:if="{{selectLabel}}">
<view class="flex-1">{{selectLabel}}</view>
<van-icon class="gray-3" name="clear" wx:if='{{!show}}' catchtap="clearInput" />
<van-icon class="gray-3" name="arrow-up" wx:else />
</block>
<block wx:else>
<view class="flex-1 gray-3 line-1">{{placeholder}}</view>
<van-icon class="gray-3" name="arrow-down" class="transfer {{show ? 'is-reverse' : 'no-reverse' }}" />
</block>
</block>
</view>
<!-- 下拉展开后的可选择内容 -->
<block wx:if='{{show}}'>
<view class="{{toTop ? 'triangleBox-top' : 'triangleBox'}}">
<view class="{{toTop ? 'triangle-top' : 'triangle'}}"></view>
</view>
<view class="content radius-10 pd-20 size-28" style="{{toTop ? 'top: -' + (options.length > 4 ? 150 : (options.length * 30 + 40)) + 'rpx; margin-top: -6rpx;' : 'margin-top: 10rpx;'}}">
<view class="pd-10 center gray-3" wx:if="{{options.length < 1}}">暂无数据</view>
<view class="line-1 w100 pd-10 contentItem {{item[valueName] == selectValue ? 'bold':''}}" wx:for="{{options}}" wx:key="index" bindtap="handleChange" data-item="{{item}}" style="color: {{ item[valueName] == selectValue ? textColor : '#000'}}; background: {{item[valueName] == selectValue ? itemBgColor:''}};">
{{item[labelName]}}
</view>
</view>
</block>
</view>
</view>
wxss:
css
.select_all_view {
display: flex;
justify-content: start;
align-items: start;
z-index: 999;
margin-bottom: 20rpx;
}
.select_view {
/* min-width: 200rpx; */
min-height: 64rpx;
}
.inputPlaceholder {
font-size: 28rpx;
}
.flex_l{
display: flex;
}
.flex-1{
flex: 1;
}
.pd-10{
padding:20rpx;
}
.relative{
position: relative;
}
.radius-10{
border-radius: 10rpx;
}
.icon {
position: absolute;
right: 12rpx;
top: 20rpx;
}
.contentItem {
height: 30rpx;
line-height: 30rpx;
font-size: 24rpx;
}
.content {
width: calc(100% - 4px);
margin-left: 2px;
position: absolute;
z-index: 999;
max-height: 150rpx;
background: #FFFFFF;
/* border: 1px solid #ccc; */
box-shadow: 0 0 4px #ccc;
opacity: 1;
/* margin-top: 10rpx; */
overflow-x: hidden;
overflow-y: scroll;
}
.triangleBox {
position: absolute;
z-index: 1000;
left: 30rpx;
}
.triangle {
position: relative;
border-left: 12rpx solid transparent;
border-right: 12rpx solid transparent;
border-bottom: 10rpx solid #ccc;
}
.triangle::after {
content: '';
position: absolute;
top: 3rpx;
left: -12rpx;
border-left: 12rpx solid transparent;
border-right: 12rpx solid transparent;
border-bottom: 10rpx solid #fff;
}
.triangleBox-top {
position: absolute;
z-index: 1000;
left: 30rpx;
/* display: none; */
}
.triangle-top {
position: relative;
border-left: 12rpx solid transparent;
border-right: 12rpx solid transparent;
border-top: 10rpx solid #ccc;
}
.triangle-top::after {
content: '';
position: absolute;
bottom: 3rpx;
left: -12rpx;
border-left: 12rpx solid transparent;
border-right: 12rpx solid transparent;
border-top: 10rpx solid #fff;
}
.is-reverse {
transform: rotate(180deg);
}
.transfer {
transition: transform .3s;
}
.no-reverse {
transition: rotate(0deg);
}
js:
javascript
Component({
options: {
addGlobalClass: true,
},
properties: {
/* --------- 样式参数 --------- */
titleWidth: { // 标题长度
type: String,
value: "60px"
},
bgColor: { // 输入框背景颜色
type: String,
value: "#fff"
},
itemBgColor: { // 选中的选项背景颜色
type: String,
value: "#F5F8FE"
},
textColor: { // 选中的字体颜色
type: String,
value: "#FF5733"
},
/* --------- 数据参数 --------- */
title: { // 下拉框标题
type: String,
value: ""
},
number: { // 下拉框标题
type: String,
value: ""
},
options: { // 选项数组
type: Array,
value: [],
},
labelName: { // 选项数组-绑定的label名称
type: String,
value: "dictLabel",
},
valueName: { // 选项数组-绑定的value名称
type: String,
value: "dictValue"
},
modelValue: { // 绑定的value
type: String,
value: "",
observer: function () {
//如果有默认值,需要匹配出name,所以这里使用obersver,当父组件中值改变时触发
this.handleData();
}
},
placeholder: { // 输入框为空时占位符
type: String,
value: "请选择"
},
disabled: { // 是否禁用
type: Boolean,
value: false
},
readonly: { // 是否只读
type: Boolean,
value: false
}
},
/**
* 页面的初始数据
*/
data: {
show: false, //选项框及图标展示
selectValue: "", //选中的value
selectLabel: "", //选中的label
toTop: false, // 下拉框是否展示在输入框上方
},
attached() {
this.handleData()
},
methods: {
// 清空输入框
clearInput() {
this.setData({
selectValue: "", //选中的value
selectLabel: "", //选中的label
show: false,
})
},
// 下拉框收起和展开
changeShow(e) {
let that = this
const query = wx.createSelectorQuery();
// 选择当前点击的 view 元素
query.select('.inputPlaceholder'+this.data.number).boundingClientRect();
query.exec(function (res) { // res[0].bottom 是元素距离可视区域顶部的距离加上元素自身的高度; res[1].scrollTop 是页面的滚动距离
var show = !that.data.show
if (res[0]) {
/* that.triggerEvent("handleShow", show); // [暂未发现]处理滚动选项区域时背景页面滚动问题 */
let toBottom = wx.getSystemInfoSync().windowHeight - res[0].bottom;
console.log('距离设备底部的距离:', toBottom);
that.setData({
toTop: toBottom < 150 ? true : false,
show: show
})
} else {
that.setData({ show: show })
}
});
},
// 选择数据后回显
handleChange(e) {
let { item } = e.currentTarget.dataset
let { labelName, valueName } = this.data
this.setData({
selectValue: item[valueName],
selectLabel: item[labelName],
show: false
})
let obj = {}
obj[valueName] = item[valueName]
obj[labelName] = item[labelName]
this.triggerEvent("handleChange", obj);// 传参
},
// 匹配值并回显
handleData() {
let { modelValue, options, valueName, labelName } = this.properties;
if (modelValue) {
let item = options.find(r => r[valueName] == modelValue)
this.setData({
selectLabel: item ? item[labelName] : modelValue,
selectValue: modelValue,
});
}
}
}
})
json:
javascript
{
"component": true,
"usingComponents": {}
}
以上就是组件的全部代码,当然你也可以自己再按照需求改造,接下来就是组件的应用:
组件应用:
1.在所需要用组件的页面中引入组件,在所需页面的json中:
javascript
{
"navigationBarTitleText": "",
"usingComponents": {
"wan-select": "../components/van-select/index"
}
}
2.在wxml里面使用:
html
<view class="cont-box">
<wan-select
class="inputPlaceholder1"
options="{{options1}}"
number="1"
labelName="text"
valueName="id"
modelValue="{{selectedId1}}"
placeholder="请选择"
bindhandleChange="handleChange"
title=""
readonly="{{false}}"
disabled="{{options1.length == 0}}"></wan-select>
</view>
说明:
class="inputPlaceholder1" (自己写的类,可以修改样式)
options="{{options1}}"(下拉框的选项数据)
labelName="text"(选项数组-绑定的label名称)
valueName="id"(选项数组-绑定的value名称)
number="1"(自定义的值,多个select 有关联的情况下,添加,根据自己需求,一个的话没必要)
modelValue="{{selectedId1}}"(为了回显下拉框数据中选中的项)
bindhandleChange="handleChange"(操作事件)
title="" (下拉框左侧添加名称)
readonly="{{false}}"(是否只读)
disabled=""(是否禁用)
如图所示: