该组件已更新，查看具体请移步个人主页（2023/11/23）

1.最近在uniapp上做了一款类似elementui的多功能选择器的组件，可下拉可搜索可情况，支持异步请求渲染下拉列表

废话不多说，先看视频！！！！！

2.需要的环境

（1）因为组件基于uView二次封装，所以请安装uView组件，安装步骤请看uView官方文档

3.以下代码直接复制

        说明：@select方法可以在父组件拿到当前选择项的对象数据

<template>
	<view class="uni-combox" :class="border ? '' : 'uni-combox__no-border'" :style="{position:selectPosition}">
		<view class="uni-combox__input-box">
			<view v-if='!isShowInput'  @click="isShowInput = true" class="wraper-inpu-text" >
				<text v-if="inputValCopy" class="wrper-text-vlaue">{{inputValCopy}}</text>
				<text v-else class="wrper-text-placeholder" :style='placeholderStyle'>{{inputValPlaceholder}}</text>
			</view>
			
			<u-input v-else :placeholderStyle='placeholderStyle' class="uni-combox__input" focus type="text"
				:placeholder=" inputValPlaceholder" ref="input" placeholder-class="uni-combox__input-plac"
				v-model="inputVal" @input="onChange" @focus="onFocus" @blur="onBlur" />
		</view>
		<view class="uni-combox__selector" v-show="showSelector && dataList.length !== 0">
			<view class="uni-popper__arrow"></view>
			<u-list @scrolltolower="scrolltolower">
				<u-list-item v-for="(item, index) in dataList" :key="index">
					<u-cell :title="item[valueKey]" @click="onSelectorClick(index)"></u-cell>
				</u-list-item>
			</u-list>
			
		<!-- 	<view class="uni-combox__selector-empty" v-if="filterCandidatesLength === 0 && isLoading == false">
				<text>{{emptyTips}}</text>
			</view> -->
		</view>
	</view>
</template>

<script>
	export default {
		name: 'uniCombox',
		emits: ['input'],
		props: {
			placeholderStyle: {        //输入框placeholder状态的样式
				type: String,
				default: 'font-size:15px;color:#C0C4CC'
			},
			selectPosition: {          //是否在组件父元素添加定位  默认relative
				type: String,
				default: 'relative'

			},
			valueKey: {                 //父组件data数据需要在列表中渲染的key值
				type: String,
				default: 'companyName'
			},
			border: {
				type: Boolean,         //默认显示下边框
				default: true
			},
			label: {
				type: String,         //选择器label  不建议使用
				default: ''
			},
			labelWidth: {				//选择器label宽度  不建议使用
				type: String,
				default: 'auto'
			},
			placeholder: {				//选择器placeholder文本 
				type: String,
				default: ''
			},
			candidates: {				//选择器下拉框数据  格式为[{}] 
				type: Array,
				default () {
					return []
				}
			},
			emptyTips: {				//选择器下拉框数据为空文本  ---已注释掉  需要的可以手动打开
				type: String,	
				default: '无匹配项'
			},
			value: {
				type: [String, Number],
				default: ''
			},
			myMessage: {				//父组件的值 
				type: [String, Number],
				default: ''
			},
		},
		data() {
			return {
				dataList:[],
				showSelector: false,
				placeholderCopy: '',
				inputVal: '',
				inputValCopy:'',
				isShowInput:false,
				inputValPlaceholder:"",
				input:""
			}
		},
		computed: {
			labelStyle() {
				if (this.labelWidth === 'auto') {
					return ""
				}
				return `width: ${this.labelWidth}`
			},
			filterCandidates() {
				return this.candidates
				
			},
			filterCandidatesLength() {
				return this.filterCandidates.length
			}
		},
		watch: {
			myMessage: {
				handler(newVal) {
					
					
					if (newVal) {
						this.inputValCopy = newVal
						this.inputValPlaceholder = newVal
					}else{
						this.inputValCopy = newVal
						this.inputValPlaceholder = this.placeholder
					}
					
					
				},
				immediate: true,
				deep: true
			},		
			candidates:{
				handler($value){
					this.dataList = $value
				},
				deep:true,
				immediate:true
			}
		},
		methods: {
			toggleSelector() {
				this.showSelector = !this.showSelector
			},

			onFocus() {
				if(this.inputValCopy){
					
					this.placeholderCopy = this.inputValCopy
				}else{

					this.placeholderCopy = this.placeholder
				}
				this.showSelector = true
			},
			onBlur() {

				setTimeout(() => {
					this.showSelector = false
					this.isShowInput = false
					this.inputVal = ''
				}, 153)
			},
			onSelectorClick(index) {
				this.showSelector = false
				this.isShowInput = false
				this.$emit('update:myMessage', this.dataList[index][this.valueKey])
				this.$emit('select', this.dataList[index])

			},
			as() {
				this.$emit('input', this.inputVal)
			},
			scrolltolower() {
				this.$emit('srolltolower')
			},
			onChange(e) {
				// this.input = e
				this.dataList = []
				uni.$u.debounce(this.as, 200)
				
				
			}
		}
	}
</script>

<style lang="scss" scoped>
	.wraper-inpu-text{
		display: flex;
		align-items: center;
		// justify-content: center;
		height: 44rpx;
		width: 100%;
		flex: 1;
		& text{
			line-height: 26px;
		}
	}
	.wrper-text-vlaue{
		font-size: 15px;
	}
	.uni-combox {

		font-size: 14px;
		// border: 1px solid #DCDFE6;
		border-radius: 4px;
		// padding: 6px 10px;
		position: relative;
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		// height: 40px;
		flex-direction: row;
		align-items: center;
		width: 100% !important;
		// border-bottom: solid 1px #DDDDDD;
	}

	.uni-combox__label {
		font-size: 16px;
		line-height: 22px;
		padding-right: 10px;
		color: #999999;
	}

	.uni-combox__input-box {
		position: relative;
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex: 1;
		flex-direction: row;
		align-items: center;
	}

	.uni-combox__input {
		flex: 1;
		font-size: 14px;
		height: 22px;
		line-height: 22px;
	}

	.uni-combox__input-plac {
		font-size: 28rpx;
		text-align: left;
		color: rgb(180, 180, 180);
	}

	.uni-combox__selector {
		/* #ifndef APP-NVUE */
		box-sizing: border-box;
		/* #endif */
		position: absolute;
		top: calc(100% + 12px);
		left: 0;
		width: 100%;
		background-color: #FFFFFF;
		border: 1px solid #EBEEF5;
		border-radius: 6px;
		box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
		z-index: 2;
		padding: 4px 0;
	}

	.uni-combox__selector-scroll {
		/* #ifndef APP-NVUE */
		max-height: 200px;
		box-sizing: border-box;
		/* #endif */
	}

	.uni-combox__selector-empty,
	.uni-combox__selector-item {
		/* #ifndef APP-NVUE */
		display: flex;
		cursor: pointer;
		/* #endif */
		line-height: 36px;
		font-size: 14px;
		text-align: center;
		// border-bottom: solid 1px #DDDDDD;
		padding: 0px 10px;
	}

	.uni-combox__selector-item:hover {
		background-color: #f9f9f9;
	}

	.uni-combox__selector-empty:last-child,
	.uni-combox__selector-item:last-child {
		/* #ifndef APP-NVUE */
		border-bottom: none;
		/* #endif */
	}

	// picker 弹出层通用的指示小三角
	.uni-popper__arrow,
	.uni-popper__arrow::after {
		position: absolute;
		display: block;
		width: 0;
		height: 0;
		border-color: transparent;
		border-style: solid;
		border-width: 6px;
	}

	.uni-popper__arrow {
		filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.03));
		top: -6px;
		left: 10%;
		margin-right: 3px;
		border-top-width: 0;
		border-bottom-color: #EBEEF5;
	}

	.uni-popper__arrow::after {
		content: " ";
		top: 1px;
		margin-left: -6px;
		border-top-width: 0;
		border-bottom-color: #fff;
	}

	.uni-combox__no-border {
		border: none;
	}

	::v-deep .u-list {
		min-height: 0 !important;
		max-height: 350rpx !important;
		height: auto !important;
	}
</style>

4.使用

（1）引入该组件

（2）父组件写法

5.创作不易，点个赞再走吧，不懂的老铁可以私我