怎么使用vue实现可搜索下拉框功能
本篇内容主要讲解“怎么使用vue实现可搜索下拉框功能”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“怎么使用vue实现可搜索下拉框功能”吧!
效果图：
子组件 DROPDOWN.VUE
<template>
<div class="vue-dropdown default-theme">
<div class="cur-name" :class="isShow ? 'show':''" @click="isShow =! isShow">{{itemlist.cur.name}}</div>
<div class="list-and-search" :class="isShow?'on':''">
<div class="search-module clearfix" v-show="isNeedSearch">
<input class="search-text"
@keyup='search($event)' :placeholder="placeholder" />
</div>
<ul class="list-module">
<li v-for ="(item,index) in datalist" @click="selectToggle(item)"
:key="index">
<span class="list-item-text">{{item.name}}</span>
</li>
</ul>
<div class="tip-nodata" v-show="isNeedSearch && datalist.length == 0">{{nodatatext}}</div>
</div>
</div>
</template>
<script>
export default {
data(){
return {
datalist:[],
isShow:false
}
},
props:{
'itemlist':Object,//父组件传来的数据
'placeholder':{
type:String,
default: '搜索' //input placeholder的默认值
},
'isNeedSearch':{ //是否需要搜索框
type:Boolean,
default: false
},
'nodatatext':{
type:String,
default: '未找到结果' //没有搜索到时的文本提示
}
},
created(){
this.datalist = this.itemlist.data;
//点击组件以外的地方，收起
document.addEventListener('click', (e) => {
if (!this.$el.contains(e.target)){
this.isShow = false;
}
}, false)
},
methods:{
selectToggle(data){
this.itemlist.cur.name = data.name;
this.isShow = false;
this.$emit('item-click',data);
},
search(e){
let searchvalue = e.currentTarget.value;
this.datalist = this.itemlist.data.filter((item,index,arr)=>{
return item.name.indexOf(searchvalue) != -1;
});
}
}
}
</script>
<style lang="less" scoped>
.list-and-search{
background: #fff;
border: 1px solid #ccc;
display: none;
&.on{
display: block;
}
}
.cur-name{
height: 32px;
line-height: 32px;
text-indent: 10px;
position: relative;
color: #777;
&:after{
position: absolute;
right: 9px;
top: 13px;
content: " ";
width: 0;
height: 0;
border-right: 6px solid transparent;
border-top: 6px solid #7b7b7b;
border-left: 6px solid transparent;
border-bottom: 6px solid transparent;
}
&.show{
&:after{
right: 9px;
top: 6px;
border-right: 6px solid transparent;
border-bottom: 6px solid #7b7b7b;
border-left: 6px solid transparent;
border-top: 6px solid transparent;
}
}
}
.vue-dropdown.default-theme {
width: 200px;
z-index:10;
border-radius:3px;
border: 1px solid #ccc;
cursor: pointer;
-webkit-user-select:none;
user-select:none;
&._self-show {
display: block!important;
}
.search-module {
position: relative;
border-bottom: 1px solid #ccc;
.search-text {
width: 100%;
height: 30px;
text-indent: 10px;
// border-radius: 0.5em;
box-shadow: none;
outline: none;
border: none;
// &:focus {
// border-color: #2198f2;
// }
}
.search-icon {
position: absolute;
top: 24%;
right: 0.5em;
color: #aaa;
}
}
input::-webkit-input-placeholder{
font-size: 14px;
}
.list-module {
max-height: 200px;
overflow-y: auto;
li {
&._self-hide {
display: none;
}
margin-top: 0.4em;
padding: 0.4em;
&:hover {
cursor:pointer;
color: #fff;
background: #00a0e9;
}
}
}
}
.tip-nodata {
font-size: 14px;
padding: 10px 0;
text-indent: 10px;
}
</style>父组件调用
<dropdown :item-click="dropDownClick" :isNeedSearch="true" :itemlist="itemlist"></dropdown>import Dropdown from '@/components/dropdown.vue'
export default {
data() {
return {
itemlist: {
cur: {
val: "",
name: "所有产品"
},
data: [{
val: "",
name: "所有产品"
}, {
val: 1,
name: "梦幻西游"
}, {
val: 2,
name: "梦幻无双"
}, {
val: 3,
name: "大话西游"
}]
},
}
},
components: {
Dropdown,
},
methods :{
dropDownClick(e) {
console.log(e.name, e.val)
}
}
}默认是不带搜索框，如果需要可以传这个:
isNeedSearch="true"。ps：下面看下vue组件实践-可搜索下拉框
实践加深对vue的理解和运用有效途径，本文是基于vue的可搜索下拉框定制组件实现，在此记录.
一、效果
二、组件代码
dropdown.vue
<template>
<div class="vue-dropdown default-theme" v-show-extend="show">
<div class="search-module clearfix" v-show="itemlist.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="!length">{{nodatatext}}</div>
</div>
</template>
<script>
export default {
data(){
return {
datalist:[]
}
},
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
},
watch:{
itemlist:function(val){
this.datalist = val.concat();
}
},
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.itemlist.filter(function(item,index,arr){
return item.name.indexOf(searchvalue) != -1;
});
}
},
computed:{
length:function(){
return this.datalist.length;
}
}
}
</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>三、组件使用
<dropdown :itemlist="itemlist" :placeholder="placeholder"
:nodatatext="nodatatext"></dropdown>vue是什么
Vue是一套用于构建用户界面的渐进式JavaScript框架，Vue与其它大型框架的区别是，使用Vue可以自底向上逐层应用，其核心库只关注视图层，方便与第三方库和项目整合，且使用Vue可以采用单文件组件和Vue生态系统支持的库开发复杂的单页应用。
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