ElementUI实现在下拉列表里面进行搜索功能详解
目录
分析:
html:
js:
css:
使用
总结
分析:
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
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
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:<template>
<div class="arrbox">
<!-- 通过visible控制显示还是隐藏 -->
<el-popover
v-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-select
ref="select"
v-model="currentval"
:style="{width:`${width}px`,height:`${height}`}"
multiple
:placeholder="placeholder"
:popper-append-to-body="false"
popper-class="hide-popper"
style="width:100%"
@visible-change="visibleChange"
@focus="getFocus"
> <el-option
v-for="item in selectItem"
:key="`${item.value}_k`"
:label="item.label"
:value="item.value"
/></el-select>
</div>
<!-- selectBxClick让select强制选中 -->
<div class="selectMain" :style="{'min-width':`${width-20}px`}" @click="selectBxClick">
<div class="seachButton">
<el-select
v-model="seachValue"
placeholder=" 请选择筛选"
style="width:70%;margin-right:10px;max-width:195px"
@visible-change="selectBxClick()"
>
<el-option
v-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.$emit('change-parentArr', value)
}
}
},
created() {
},
methods: {
getList(value) {
this.list = [{
label: '全部',
value: 'all'
}, ...seachClickList.filter(n => n.type == value)]
this.getSelectItem()
},
// 获取选中的item
getSelectItem() {
const noItemList = this.currentval.map(n => {
if (this.selectItem.findIndex(i => i.value == n) == -1) {
return n
}
return null
}).filter(n => n != null)
noItemList.forEach(item => {
const index = this.list.findIndex(i => i.value == item)
if (index != -1) {
this.selectItem.push(this.list[index])
}
})
},
getFocus() {
this.visible = true
},
visibleChange(data) {
this.visible = data
},
selectBxClick() {
// 避免点击框体时组件消失
this.$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'
}
]
}
}
}
总结
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