基于vue实现可搜索下拉框定制组件

<template> <div class="vue-dropdown default-theme" v-show-extend="show">  <div class="search-module clearfix" v-show="length">   <input class="search-text"    @keyup='search($event)' :placeholder="placeholder" />   <span class="glyphicon glyphicon-search search-icon"></span>  </div>  <ul class="list-module" v-show="length">   <li v-for ="(item,index) in datalist" @click="appClick(item)"    :key="index">    <span class="list-item-text">{{item.name}}</span>   </li>  </ul>  <div class="tip__nodata" v-show="!datalist.length">{{nodatatext}}</div> </div></template><script> export default {  data(){   return {    _datalist:this.itemlist.concat(),    datalist:this.itemlist.concat(),    length:this.itemlist.length   }  },  props:{   'show':{//用于外部控制组件的显示/隐藏    type:Boolean,    default:true   },   'itemlist':Array,   'placeholder':String,   'nodatatext':String  },  directives:{   'show-extend':function(el,binding,vnode){//bind和 update钩子    let value = binding.value,searchInput = null;    if(value){     el.style.display='block';    }else{//隐藏后，恢复初始状态     el.style.display='none';     searchInput = el.querySelector(".search-text");     searchInput.value = '';     vnode.context.datalist = vnode.context.itemlist;//还原渲染数据    }   }  },  methods:{   appClick:function(data){    this.$emit('item-click',data);   },   search:function(e){    let vm = this,searchvalue = e.currentTarget.value;    vm.datalist = vm.$data._datalist.filter(function(item,index,arr){     return item.name.indexOf(searchvalue) != -1;    });   }  },  mounted:function(){  } }</script><style lang="scss" scoped> .vue-dropdown.default-theme {  position: absolute;  left:15%;  display: none;  width: 70%;  margin: 0 auto;  margin-top: 1em;  padding: 1em;  z-index:10;  box-shadow: 0px 0px 10px #ccc;  &._self-show {   display: block!important;  }  .search-module {   position: relative;   .search-text {    width: 100%;    height: 30px;    padding-right: 2em;    padding-left:0.5em;    border-radius: 0.5em;    box-shadow: none;    border: 1px solid #ccc;    &:focus {     border-color: #2198f2;    }   }   .search-icon {    position: absolute;    top: 24%;    right: 0.5em;    color: #aaa;   }  }  .list-module {   max-height: 200px;   overflow-y: auto;   li {    &._self-hide {     display: none;    }    margin-top: 0.5em;    padding: 0.5em;    &:hover {     cursor:pointer;     color: #fff;     background: #00a0e9;    }   }  } } .tip__nodata {  font-size: 12px;  margin-top: 1em; }</style>

<dropdown :itemlist="itemlist" :placeholder="placeholder" :nodatatext="nodatatext"></dropdown>