分析:

1. 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
2. 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
3. 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:

• js:

1. 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

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

3. 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

4. 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.$emit('change-parentArr', value)}}},created() {},methods: {getList(value) {this.list = [{label: '全部',value: 'all'}, ...seachClickList.filter(n => n.type == value)]this.getSelectItem()},// 获取选中的itemgetSelectItem() {const noItemList = this.currentval.map(n => {if (this.selectItem.findIndex(i => i.value == n) == -1) {return n}return null}).filter(n => n != null)noItemList.forEach(item => {const index = this.list.findIndex(i => i.value == item)if (index != -1) {this.selectItem.push(this.list[index])}})},getFocus() {this.visible = true},visibleChange(data) {this.visible = data},selectBxClick() {// 避免点击框体时组件消失this.$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:

  1. 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