ElementUI怎么实现在下拉列表里面进行搜索功能

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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

1. 使用popper-append-to-body="false"不需要插入浮动元素

2. 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

3. 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

4. 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-popoverv-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-selectref="select"v-model="currentval":multiple:placeholder="placeholder":popper-append-to-body="false"popper-class="hide-popper"@visible-change="visibleChange"@focus="getFocus"> <el-optionv-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" : @click="selectBxClick"><div class="seachButton"><el-selectv-model="seachValue"placeholder=" 请选择筛选"@visible-change="selectBxClick()"><el-optionv-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:

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'}]}}}

感谢各位的阅读，以上就是“ElementUI怎么实现在下拉列表里面进行搜索功能”的内容了，经过本文的学习后，相信大家对ElementUI怎么实现在下拉列表里面进行搜索功能这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是编程网，小编将为大家推送更多相关知识点的文章，欢迎关注！