项目背景：vue2,主要使用antd1.7.8
没找到合适的自带虚拟列表的下拉选择框，所以这里我基于vue-virtual-scroller和vue-select封装了一个选择框，功能样式都参考antd-select，支持多选/单选/清除/搜索功能。
为什么不用antd-select结合vue-virtual-scroller呢？
因为我第一次做是想在模板中option外层套虚拟列表，但是1.7.8版本不支持，要求select子元素必须是option，所以我才选了vue-select，一开始也是写在模板中的，然后有一些问题（具体什么来着有点忘了，这组件不是最近写的）。然后选择了动态挂载dom的方式来做：聚焦选择框，再挂载虚拟列表。
这里用vue-select比较麻烦就是改了许多样式来仿照antd，主要因为样式我都写完了才换的动态挂载，其实可以尝试直接用antd-select来动态挂载，我觉得应该会少些很多代码！！！
目前该组件还有一个问题待优化：把下拉列表挂载到body上，让其脱离文档流，不用影响父元素的高度。 这个后面再做一下。
使用示例
1.components中创建一个VirtualSelect.vue组件
javascript
<template>
<div class="ant-select-wrapper" :class="{ 'is-multiple': isMultiple }">
<v-select
ref="select"
class="form-item"
:value="localValue"
:options="options"
:multiple="isMultiple"
:placeholder="placeholder"
label="label"
track-by="value"
:close-on-select="isMultiple ? false : true"
:filterable="false"
:reduce="option => option.value"
:search-from-dropdown="isMultiple ? true : false"
@input="handleInput"
@on-option-selected="optionAfterSelect"
@search-blur="handleSearchBlur"
@search-focus="handleSearchFocus"
@search="handleCustomSearch"
>
<!-- 自定义每个已选tag -->
<template v-if="isMultiple" #selected-option-container="{ option, deselect }">
<span class="ant-select-selection__choice" :title="option.label">
<span class="ant-select-selection__choice__content">
{{ option.label }}
</span>
<span class="ant-select-selection__choice__remove" @click.stop="deselect(option)" @mousedown.prevent>
<i class="iconfont icon-close"></i>
</span>
</span>
</template>
<!-- ✅ 关键：自定义选中值样式（不换行、省略号、悬浮提示） -->
<template v-else #selected-option="{ label }">
<div class="vs_selected-value" :title="label">
{{ label }}
</div>
</template>
</v-select>
<!-- 清除图标 (Ant Design 风格) -->
<span v-if="allowClear && localValue.length" class="ant-select-clear" @click.stop="clearAll" title="清除">
<a-icon type="close-circle" theme="filled" style="font-size:12px" />
</span>
</div>
</template>
import { RecycleScroller } from 'vue-virtual-scroller'
import VirtualOptions from './VirtualOptions.vue' // ✅ 模板组件
import DropdownOption from './DropdownOption.vue'
import { Empty } from 'ant-design-vue'
export default {
name: 'VirtualSelect',
inheritAttrs: false, // 确保$attrs/$props特性不会被应用到根元素上
components: {
// 注意：我们不直接在这里注册 VirtualOptions，因为要手动 $mount RecycleScroller，✅ 注册一下确保模板能识别（虽然这里没用到）
RecycleScroller,
DropdownOption
},
model: {
prop: 'value',
event: 'input'
},
props: {
value: {
type: [String, Number, Array],
default: null
},
// 原始全量数据
options: {
type: Array,
default: () => []
},
placeholder: {
type: String,
default: '请选择'
},
mode: {
type: String,
default: 'single', // 'single' | 'multiple'
validator: (val) => ['single', 'multiple'].includes(val)
},
// 清空全选项
allowClear: {
type: Boolean,
default: true
},
// 是否清空搜索框keyword
clearSearchKey: {
type: Boolean,
default: true
}
},
data() {
return {
simpleEmptyImage: Empty.PRESENTED_IMAGE_SIMPLE,
searchDebounce: null,
pointer: -1,
localOptions: [...this.options], // 当前下拉框中显示的选项（搜索过滤后的）
virtualListComponent: null,
dropdownMenuEl: null,
localValue: Array.isArray(this.value) ? [...this.value] : this.value !== null ? [this.value] : [] // 使用本地副本避免直接修改 prop
};
},
computed: {
isMultiple() {
return this.mode === 'multiple'
},
selectedOptions() {
return this.localValue.map(val => {
const opt = this.options.find(o => o.value === val)
return opt || { Value: val, label: String(val) }
})
}
},
watch: {
value: {
handler(newVal) {
const validValues = this.options.map(opt => opt.value)
// 如果options原始数据有被删除的，直接过滤掉 避免回显id
this.localValue = Array.isArray(newVal) ? newVal.filter((value) => validValues.includes(value)) : []
},
immediate: true,
deep: true
}
},
methods: {
handleCustomSearch(query) {
clearTimeout(this.searchDebounce)
this.searchDebounce = setTimeout(() => {
const vs = this.$refs.select
if (!vs) return
// 自定义过滤
const filtered = this.options.filter((option) => option.label.toLowerCase().includes(query.toLowerCase()))
this.localOptions = filtered
vs.typeAheadPointer = -1
if (filtered.length === 0) {
this.renderVirtualList()
} else {
const vs = this.$refs.select
if (!vs || !vs.$el) return
// 清除之前的虚拟列表内容
const menu = vs.$el.querySelector('.vs__dropdown-menu')
if (menu) {
menu.innerHTML = ''
}
// 设置固定高度（必须 定高虚拟列表）
const dropdownHeight = '150px'
menu.style.height = dropdownHeight
// 如果是空结果，渲染"暂无数据"占位符
const noDataEl = document.createElement('div')
noDataEl.className = 'vs__no-options'
// 添加svg和文字
const simpleEmptySvg = `
<svg width="64" height="41" viewBox="0 0 64 41" xmlns="http://www.w3.org/2000/svg" style="max-width: 100%; height: auto;">
<g transform="translate(0 1)">
<ellipse cx="32" cy="7" fill="#f5f5f5" rx="29" ry="15"></ellipse>
<path d="M22 11.046 20 8.954 20 20.8-2.954 20-20.825 32.846 21 10.954 12 2 8c-2.21 0-4 1.79-4 4s1.79 4 4 4zm8-2.21 0-4.1-1.38-1.12-2.5-2.5-2.5.25-2.5.25c-2.5 0-2.5 2.55-2.5 2.55 17.38 17.8 17.66 5.23 4.477 10 10 0 1.38-1.12 2.5-2.5 2.5-2.5 2.5-5 2.24-5 0-1.38-1.12-2.5-2.5-2.55 17.38 17.8 17.66 5.23 4.477 10 10 0 1.38-1.12 2.5-2.5 2.5z"></path>
</g>
</svg>
`
noDataEl.innerHTML = `
<div class="ant-empty-normal">
<div class="ant-empty-image">
${simpleEmptySvg}
</div>
<p class="ant-empty-description">暂无数据</p>
</div>
`
menu.appendChild(noDataEl)
}
}, 200)
},
handleInput(val) {
// 用户选择，更新本地值，触发 watch -> emit 给父组件 实现双向绑定 写watch导致卡死后就这样写吧
this.localValue = Array.isArray(val) ? val : val !== null ? [val] : []
this.$emit('input', val) // 现在会打印了！
console.log('input', val)
},
clearAll() {
// 清空全部选中值
this.localValue = [] // 触发 watch -> emit
this.$emit('input', this.localValue)
},
// 选中值后的回调
blurAfterSelect() {
// 单选：选中值后默认失焦
if (this.isMultiple) return
this.$nextTick(() => {
const vsEl = this.$refs.select ? this.$refs.select.$el : undefined
if (!vsEl) return
const input = vsEl.querySelector('input[type="search"]')
if (input && document.activeElement === input) {
input.blur()
}
})
},
// 搜索后，没有选择值，失焦应该清除输入项
handleSearchBlur() {
const vs = this.$refs.select
if (!vs) return
// 如果没有pendingOption（即没有高亮/准备选中的选项）
// 并且当前搜索词不为空，则清空它
if (!vs.pendingOption && vs.search.length) {
vs.search = ''
}
},
// 核心：当搜索框聚焦时，挂载虚拟滚动组件
handleSearchFocus() {
this.$nextTick(() => {
const vs = this.$refs.select
if (vs) {
// 立即清空原生下拉菜单
const menu = vs.$el.querySelector('.vs__dropdown-menu')
if (menu) {
menu.innerHTML = ''
}
// 设置透明背景避免闪烁
menu.style.backgroundColor = 'transparent'
setTimeout(() => {
this.renderVirtualList()
}, 50)
}
})
},
renderVirtualList() {
const vs = this.$refs.select
if (!vs) return
const menu = vs.$el.querySelector('.vs__dropdown-menu')
if (!menu) return
// 设置固定高度(必须) 定高虚拟列表
let dropdownHeight = '300px'
// 优化思路 避免数据项太短太长一拉空白
if (this.localOptions.length < 3) {
dropdownHeight = '85px'
} else if (this.localOptions.length < 6) {
dropdownHeight = '195px'
}
menu.style.height = dropdownHeight
menu.style.maxHeight = dropdownHeight
// 销毁旧实例
if (this.virtualListComponent) {
this.virtualListComponent.$destroy()
this.virtualListComponent.$el.remove()
this.virtualListComponent = null
}
// 创建新实例
const VueConstructor = this.$vue
const appInstance = new VueConstructor({
render: (h) =>
h(VirtualOptions, {
props: {
options: this.localOptions,
selectedValue: this.localValue,
pointeIndex: this.pointer,
setPointer: (index) => {
vs.typeAheadPointer = index
}
},
on: {
select: (option) => {
vs.select(option)
this.burAfterSelect()
}
}
})
}).$mount()
this.virtualListComponent = appInstance
menu.innerHTML = ''
menu.appendChild(this.virtualListComponent.$el)
}
}
}
<style scoped lang="less">
.ant-select-wrapper {
position: relative;
display: inline-block;
width: 100%;
}
.form-item {
/deep/ .vs_dropdown-toggle {
border: 1px solid #d9d9d9;
border-radius: 4px;
padding: 0 8px;
transition: all 0.3s;
min-height: 32px;
display: flex;
align-items: center;
&:hover {
border-color: #2496ff;
}
/* 多选自定义 Ant Design 风格 Tag ✨✨✨ */
.ant-select-selection__choice {
position: relative;
float: left;
max-width: 92%; // 给清空按钮留位置
margin-right: 4px;
padding: 0 10px;
color: rgba(0, 0, 0, 0.65);
background-color: #f4f4f4;
border: 1px solid #e8e8e8;
border-radius: 2px;
cursor: default;
-webkit-transition: padding 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
transition: padding 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
font-size: 14px;
height: 24px;
margin-top: 3px;
line-height: 22px;
display: flex;
justify-content: space-between;
.ant-select-selection__choice__content {
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
display: inline-block;
}
.ant-select-selection__choice__remove {
padding: 0 2px;
color: #bfbfbf;
cursor: pointer;
}
}
// 输入搜索 仅在多选时生效 换行
.vs_search,
.vs_search:focus {
padding: 0;
border: none;
outline: none;
box-shadow: none;
font-size: 14px;
color: rgba(0, 0, 0, 0.65);
/* 搜索输入光标自动换行 */
align-self: flex-start; /* 靠左对齐 */
width: 100%; /* 占满宽度 */
&::placeholder {
color: #bfbfbf;
margin-left: 0px;
}
}
// 单选选中值样式
.ant-select-selection-selected-value {
flex-grow: 1;
display: inline-block;
max-width: 100%;
overflow: hidden;
white-space: nowrap;
margin-left: 6px;
color: rgba(0, 0, 0, 0.65);
}
}
/deep/ .vs_open_indicator {
fill: #bfbfbf;
transform: rotate(0deg);
transition: transform 0.2s;
.vs_open & {
transform: rotate(180deg);
}
}
}
}
/* 单选多选都隐藏 vue-select 清空按钮，用了自定义 */
/deep/ .vs__clear {
display: none;
}
/* 多选时默认下拉展开图标 */
.ant-select-wrapper.is-multiple /deep/ .vs__actions {
opacity: 0;
}
/* 多选操作区 */
.ant-select-wrapper.is-multiple /deep/ .vs__selected-options {
width: 100%;
margin-left: 5px;
flex-wrap: wrap;
}
/* 单选 */
.ant-select-wrapper:not(.is-multiple) /deep/ .vs__selected-options {
width: 92%; /* 给下拉图标留位置 */
flex-wrap: nowrap; /* 单选不换行 */
}
/deep/ .vs__selected {
width: 100%;
}
// 单选选中值
.vs_selected-value {
display: inline-block;
max-width: 100%;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
line-height: 1.5; /* 可选：对抗高度 */
font-size: 14px;
color: rgba(0, 0, 0, 0.65);
}
/* 清除按钮 */
.ant-select-clear {
position: absolute;
top: 8px;
right: 6px;
color: #bbb;
cursor: pointer;
font-weight: bold;
line-height: 1;
user-select: none;
opacity: 0;
&:hover {
color: #8c8c8c;
}
}
// 鼠标移入显示清除按钮
.ant-select-wrapper:hover .ant-select-clear {
opacity: 1;
cursor: pointer;
}
// 并隐藏下拉图标
.ant-select-wrapper:hover /deep/ .vs_actions {
opacity: 0;
}
/* 确保 SVG 正确显示 */
.ant-empty-image {
width: 64px;
height: 41px;
overflow: visible;
}2.components中创建一个VirtualOptions.vue组件
这是使用虚拟列表做下拉列表
javascript
<template>
<RecycleScroller ref="scroller" class="virtual-options custom-scrollbar" :items="options" :item-size="36"
key-field="value" v-slot="{ item, index }">
<DropdownOption :option="item" :selected-value="selectedValue" :pointer="pointer" :index="index"
@set-pointer="setPointer" @select="select" />
</RecycleScroller>
</template>
<script>
import DropdownOption from './DropdownOption.vue'
export default {
name: 'VirtualOptions',
components: {
DropdownOption
},
props: {
options: { type: Array, required: true },
selectedValue: { type: [String, Number, Array], default: null },
pointer: { type: Number, default: -1 },
setPointer: { type: Function, required: true },
select: { type: Function, required: true }
}
}
</script>
<style scoped lang="less">
.virtual-options {
height: 100%;
width: 100%;
overflow: auto;
}
.custom-scrollbar {
/* 自定义下拉滚动条样式 */
&::-webkit-scrollbar {
width: 7px;
height: 7px;
}
&::-webkit-scrollbar-thumb {
cursor: pointer;
border-radius: 5px;
background: rgba(0, 0, 0, 0.15);
transition: color 0.2s ease;
}
&::-webkit-scrollbar-thumb:hover {
background: rgba(0, 0, 0, 0.3);
}
}
</style>3.components中创建一个DropdownOption.vue组件
这是下拉选项自定义组件
javascript
<template>
<div class="vs_dropdown-option" :class="{
'vs_dropdown-option--selected': isSelected,
'vs_dropdown-option--highlighted': isHighlighted
}" @mouseover.prevent="setHover" @click="selectOption">
<div class="vs_option-content">
<span class="vs_option-label" :title="option.label">{{ option.label }}</span>
<!-- 显示勾选图标(Ant Design 风格) -->
<span v-if="isSelected" class="vs_selected-indicator">
<a-icon type="check" />
</span>
</div>
</div>
</template>
<script>
export default {
name: 'DropdownOption',
props: {
option: { type: Object, required: true },
selectedValue: { type: [String, Number, Array], default: null },
pointer: { type: Number, default: -1 },
index: { type: Number, required: true },
setPointer: { type: Function, required: true },
select: { type: Function, required: true }
},
computed: {
isSelected() {
if (Array.isArray(this.selectedValue)) {
return this.selectedValue.includes(this.option.value)
}
return this.selectedValue === this.option.value
},
isHighlighted() {
return this.index === this.pointer
}
},
methods: {
selectOption() {
this.select(this.option)
},
setHover() {
this.setPointer(this.index)
}
}
}
</script>
<style scoped lang="less">
// 下拉选项样式
.vs_dropdown-option {
padding: 6px 12px;
cursor: pointer;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
color: rgba(0, 0, 0, 0.65);
font-size: 14px;
&.vs_dropdown-option--highlight {
background-color: #e6f7ff;
color: #1890ff;
}
// 选中加租
&.vs_dropdown-option--selected {
background-color: #f5f5f5;
font-weight: bold;
}
&:hover {
background-color: #e6f7ff;
color: #1890ff;
}
}
.vs_option-content {
display: flex;
justify-content: space-between;
align-items: center;
// 自定义原label
.vs_option-label {
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
// 自定义勾选标记
.vs_selected-indicator {
color: #1890ff;
font-weight: bold;
margin-left: 8px;
}
}
</style>4.在其他文件中使用该选择框
使用很简单，常规使用传入options就行，一个注意项是需要映射label value,写在示例的注释中了
javascript
<template>
<div class="demo-container">
<h3>虚拟滚动选择器示例</h3>
<virtual-select
v-model="selectedValue"
:options="largeOptions"
placeholder="请选择城市"
/>
<div class="selected-info">
已选择: {{ selectedValue ? selectedLabel : '未选择' }}
</div>
</div>
</template>
<script>
import VirtualSelect from '@/components/VirtualSelect.vue';
export default {
components: {
VirtualSelect
},
data() {
return {
selectedValue: null,
largeOptions: [] // 大量数据
};
},
computed: {
selectedLabel() {
const selectedItem = this.largeOptions.find(
item => item.value === this.selectedValue
);
return selectedItem ? selectedItem.label : '';
}
},
created() {
// 生成10000条模拟数据
this.largeOptions = Array.from({ length: 10000 }, (_, i) => ({
// 注意这里 不管你的真实数据是什么格式，都要求映射为value 和label value是值 label用于支持搜索
value: i + 1,
label: `城市 ${i + 1}`
}));
},
};
</script>
<style scoped>
.demo-container {
padding: 20px;
}
.selected-info {
margin-top: 20px;
color: #666;
}
</style>