elementui下拉多选（ElementUI实现在下拉列表里面进行搜索）

分析:

首先我们需要实现上图的效果,然后Element-UI的el-select是没有的,所以需要自己写 我们需要用到el-popover组件,然后使用它的v-model="visible"来实现控制显示 我们在el-popover的slot="reference" 放一个el-select 使用popper-append-to-body="false"不需要插入浮动元素 使用popper-class="hide-popper"定义浮窗class为hide-popper,并设置

display:none,这样选中了就不会存在el-select的下拉选项 el-option 循环下面选择的list里面的元素,这样就可以在el-select展示选中的并存在删除 el-select双向绑定的就是自定义选择的数组 html: <template> <div class="arrbox"> <!-- 通过visible控制显示还是隐藏 --> <el-popover v-model="visible" placement="bottom-start" width="auto" > <div slot="reference" class="check-select"> <!-- popper-append-to-body:不需要插入浮动元素,popper-class:设置类名并隐藏 --> <el-select ref="select" v-model="currentval" :style="{width:`${width}px`,height:`${height}`}" multiple :placeholder="placeholder" :popper-append-to-body="false" popper-class="hide-popper" style="width:100%" @visible-change="visibleChange" @focus="getFocus" > <el-option v-for="item in selectItem" :key="`${item.value}_k`" :label="item.label" :value="item.value" /></el-select> </div> <!-- selectBxClick让select强制选中 --> <div class="selectMain" :style="{min-width:`${width-20}px`}" @click="selectBxClick"> <div class="seachButton"> <el-select v-model="seachValue" placeholder=" 请选择筛选" style="width:70%;margin-right:10px;max-width:195px" @visible-change="selectBxClick()" > <el-option v-for="item in seachList" :key="item.value" :value="item.value" :label="item.label" /> </el-select> <div class="btn" @click="seachBtn">搜索</div> </div> <div class="selectDiv"> <div v-for="item in list.filter(n=>n.value==all)" :key="item.value" class="list" :class="[currentval.indexOf(item.value)!=-1?selected:,item.value==all?allCheck:]" @click="clickItem(item)">{{ item.label }}</div> <div class="selectDivAuto"> <div v-for="item in list.filter(n=>n.value!=all)" :key="item.value" class="list" :class="[currentval.indexOf(item.value)!=-1?selected:,item.value==all?allCheck:]" @click="clickItem(item)">{{ item.label }}</div> </div> </div> </div> </el-popover> </div> </template> js:

使用getFocus获取是否聚焦,聚焦了让visible=true,这样就可以显示出自定义的下拉选择项

通过visibleChange实施监听el-select,控制el-popover显示

在点击自定义的下拉选择项时,通过@click="selectBxClick"让el-select一直聚焦,这样箭头就会一直向上

通过 @click="seachBtn"和getList获取列表,具体需要自己去自定义

// 模拟获取的数据 const seachClickList = [{value: 1,label: 测试1,type: 1},{value: 2,label: 测试2,type: 1},{value: 3,label: 测试3,type: 1},{value: 4,label: 测试4,type: 2},{value: 5,label: 测试5,type: 2},{value: 6,label: 测试6,type: 2},{value: 7,label: 测试7,type: 2}] export default { model: { prop: parentArr, event: change-parentArr }, props: { parentArr: { type: Array, default() { return [] } }, // 传入选中的item,主要时防止list里面没有选中的数据 parentSelectItem: { type: Array, default() { return [] } }, width: { type: Number, default: 300 }, height: { type: Number, default: 30 }, placeholder: { type: String, default: 请输入 } }, data() { return { seachList: [ { value: 1, label: 条件一 }, { value: 2, label: 条件二 } ], visible: false, currentval: [], list: [], selectItem: [], seachValue: 1 } }, watch: { seachValue: { handler(value) { this.getList(value) }, deep: true, immediate: true }, parentArr: { handler(value) { this.currentval = value }, deep: true, immediate: true }, parentSelectItem: { handler(value) { this.selectItem = value.map(n => { if (n.value == all) { n.label = 全部 } return n }) }, deep: true, immediate: true }, currentval: { handler(value) { this.$emit(change-parentArr, value) } } }, created() { }, methods: { getList(value) { this.list = [{ label: 全部, value: all }, ...seachClickList.filter(n => n.type == value)] this.getSelectItem() }, // 获取选中的item getSelectItem() { const noItemList = this.currentval.map(n => { if (this.selectItem.findIndex(i => i.value == n) == -1) { return n } return null }).filter(n => n != null) noItemList.forEach(item => { const index = this.list.findIndex(i => i.value == item) if (index != -1) { this.selectItem.push(this.list[index]) } }) }, getFocus() { this.visible = true }, visibleChange(data) { this.visible = data }, selectBxClick() { // 避免点击框体时组件消失 this.$refs.select.visible = true }, // 选择 clickItem(item) { const index = this.currentval.indexOf(item.value) if (index == -1) { if (item.value == all) { this.currentval = [all] this.selectItem = [{ label: 全部, value: all }] } else { this.currentval.push(item.value) this.selectItem.push(item) const currentvalIndex = this.currentval.indexOf(all) const selectItemIndex = this.selectItem.findIndex(n => n.value == all) if (currentvalIndex != -1 && selectItemIndex != -1) { this.selectItem.splice(selectItemIndex, 1) this.currentval.splice(currentvalIndex, 1) } } } else { const itemIndex = this.selectItem.findIndex(n => n.value == item.value) this.selectItem.splice(itemIndex, 1) this.currentval.splice(index, 1) } }, // 搜索 seachBtn() { this.getList() } } }

css:

selected属性使用了el-select的样式,让样子尽量一致 .arrbox { display: inline-block; } .check-select{ ::v-deep.hide-popper{ display: none; } } ::v-deep .el-input__suffix{ i:not(.el-select__caret){ display: none; } } .selectMain { width: 100%; height: 100%; .seachButton{ width: 100%; align-items: center; display: flex; div.btn{ width: 25%; max-width: 70px; max-width: 80px; height: 40px; display: flex; align-items: center; justify-content: center; font-size: 12px; color: #fff; background-color: #409EFF; border-radius: 5px; cursor: pointer; } } .selectDiv{ width: 100%; max-width: 500px; margin-top: 10px; padding: 0 10px 0 0; .list{ width: 100%; padding: 10px 20px 10px 10px; color: #666; cursor: pointer; position: relative; &.selected{ color: #409EFF; &::after{ position: absolute; right: 0px; top: 50%; transform: translateY(-50%); font-family: element-icons; content: "\e6da"; font-size: 12px; font-weight: 700; -webkit-font-smoothing: antialiased; } } } .selectDivAuto{ width: calc(100% + 15px); max-height: 300px; overflow-y: auto; .list{ padding: 10px 30px 10px 10px; &.selected::after{ right: 10px; } } } } } .allCheck{ border-bottom: 1px solid rgb(228, 225, 225); }

使用

<template> <seachSelectInput v-model="from.tag" :parentSelectItem=selectItem :width="302" placeholder="请选择标签" /> </template> <script> import seachSelectInput from ./seachSelectInput export default { components: { seachSelectInput }, data(){ return{ from:{ tag:[1] }, selectItem:[ { value: 1, label: 测试1 } ] } } }