下拉树级带搜索功能

 可以直接复制粘贴到自己的项目里,方法处把接口替换一下

<template><div><el-popoverplacement="bottom"width="200"trigger="click"><el-inputslot="reference"class="mrInput":placeholder="placeholder"v-model="nowSelVal"clearable:disabled="disabled"@input="changeValTime"@change="changeVal"@clear="clearVal"/><div class="customTreeSelectCont"><el-treev-if="searchTit":props="treeProps":load="loadNode"empty-text="暂无数据"lazy:expand-on-click-node="false"@node-click="handleNodeClick"/><ul class="searchUl" v-else><liv-for="(item,index) in searchOptions":key="'searchUl__'+index"@click="selSearchLi(item)">{{item.label}}</li></ul></div></el-popover></div>
</template><script>
export default {name: "customTreeSelect",data() {return {nowSelVal:'',nowSelValBF:'',placeholder:'',disabled:false,treeProps: {label: 'label',value: 'value',children: 'children',isLeaf: 'leaf'},searchTit:true,searchSel:'',searchOptions:[]}},methods: {// 搜索框，实时changeValTime(val) {if(!val){this.searchTit = true}else{this.searchTit = falsethis.getSearchSelFun()}},// 搜索框，失去焦点或用户按下回车changeVal(val) {console.log('changeVal');},// 搜索框-清空clearVal() {this.searchTit = true},getSearchSelFun(){this.searchOptions = [{value: '选项1',label: '黄金糕'},{value: '选项2',label: '黄金糕22'},{value: '选项3',label: '黄金糕33'},]},// tree的懒加载loadNode(node, resolve) {// 第一次获取数据if (node.level === 0) {const arr = [{label: '测试1',value: '111'},{label: '测试2',value: '222'},]return resolve(arr)} else {// 之后点击获取数据if(node.level === 5) return resolve([])const datas = [{label: 'mmm',value: '555'}]return resolve(datas)//   // return resolve([])}},handleNodeClick(data) {this.nowSelVal = data[this.treeProps.label]},selSearchLi(data) {console.log(data);this.nowSelVal = data[this.treeProps.label]},}
}
</script><style lang="scss" scoped>.mrInput{width: 433px;}.searchUl{padding:0;margin:0;list-style: none;li{padding:5px 10px;cursor: pointer;&:hover{background: #f5f7fa;}}}.customTreeSelectCont{max-height: 500px;overflow-y: auto;&::-webkit-scrollbar {width: 6px;}//默认不展示&::-webkit-scrollbar-thumb {border-radius: 10px;background: rgba(0,0,0,0);}//划过展示，具体写法自己改改&:hover::-webkit-scrollbar-thumb {background: rgba(0,0,0,0.1);}&::-webkit-scrollbar-track {border-radius: 0;background: rgba(0,0,0,0);}}
</style>

 成果是这样的,可以手动试一下