2021-06-08 14:12:16 +08:00
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## Select V2 虚拟列表选择器
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:::tip
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2021-08-26 09:57:56 +08:00
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这个组件目前在测试当中,如果在使用中发现任何漏洞和问题,请在 [Github](https://github.com/element-plus/element-plus/issues) 中提交 issue 以便我们进行处理
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2021-06-08 14:12:16 +08:00
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:::
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### 背景
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在数据量爆发的今天,很多时候一个选择器可能从服务器加载非常多的数据,然而浏览器在一次性把这些数据渲染到页面上的时候会出现卡顿甚至是崩溃的情况,所以虚拟化技术应运而生,为了更好的用户体验和更好的使用体验,我们决定添加这个组件。
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### 基础用法
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适用广泛的基础选择器
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:::demo
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```html
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<template>
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<el-select-v2
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v-model="value"
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:options="options"
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placeholder="请选择"
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2021-09-01 13:14:17 +08:00
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style="width: 240px;"
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2021-06-08 14:12:16 +08:00
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/>
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</template>
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<script>
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const initials = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j']
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export default {
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data() {
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return {
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options: Array.from({ length: 1000 }).map((_, idx) => ({
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value: `选项${idx + 1}`,
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label: `${initials[idx % 10]}${idx}`,
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})),
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value: '',
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}
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},
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}
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</script>
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```
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:::
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### 多选
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最基础的多选选择器
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:::demo
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```html
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<template>
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<el-select-v2
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v-model="value"
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:options="options"
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placeholder="请选择"
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2021-09-01 13:14:17 +08:00
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style="width: 240px;"
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2021-06-08 14:12:16 +08:00
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multiple
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/>
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</template>
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<script>
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const initials = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j']
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export default {
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data() {
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return {
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options: Array.from({ length: 1000 }).map((_, idx) => ({
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value: `选项${idx + 1}`,
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label: `${initials[idx % 10]}${idx}`,
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})),
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value: [],
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}
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},
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}
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</script>
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```
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:::
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### 隐藏多余标签的多选
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:::demo
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```html
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<template>
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<el-select-v2
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v-model="value"
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:options="options"
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placeholder="请选择"
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2021-09-01 13:14:17 +08:00
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style="width: 240px;"
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2021-06-08 14:12:16 +08:00
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multiple
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collapse-tags
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/>
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</template>
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<script>
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const initials = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j']
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export default {
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data() {
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return {
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options: Array.from({ length: 1000 }).map((_, idx) => ({
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value: `选项${idx + 1}`,
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label: `${initials[idx % 10]}${idx}`,
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})),
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value: [],
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}
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},
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}
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</script>
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```
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:::
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### 可筛选的多选
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当选项过多时,可通过匹配筛选
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:::demo
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```html
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<template>
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<el-select-v2
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v-model="value"
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filterable
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:options="options"
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placeholder="请选择"
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2021-09-01 13:14:17 +08:00
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style="width: 240px;"
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2021-06-08 14:12:16 +08:00
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multiple
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/>
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</template>
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<script>
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const initials = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j']
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export default {
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data() {
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return {
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options: Array.from({ length: 1000 }).map((_, idx) => ({
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value: `选项${idx + 1}`,
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label: `${initials[idx % 10]}${idx}`,
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})),
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value: [],
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}
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},
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}
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</script>
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```
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:::
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### 禁用状态
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您可以选择禁用 Select 或者 Select 的 Option
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:::demo
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```html
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<template>
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<el-select-v2
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v-model="value"
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filterable
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:options="options"
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placeholder="请选择"
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2021-09-01 13:14:17 +08:00
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style="width: 240px; margin-right: 16px; vertical-align: middle;"
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2021-06-08 14:12:16 +08:00
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multiple
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/>
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<el-select-v2
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disabled
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v-model="value"
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filterable
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:options="options"
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placeholder="请选择"
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2021-09-01 13:14:17 +08:00
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style="width: 240px; vertical-align: middle;"
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2021-06-08 14:12:16 +08:00
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multiple
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/>
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</template>
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<script>
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const initials = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j']
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export default {
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data() {
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return {
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options: Array.from({ length: 1000 }).map((_, idx) => ({
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value: `选项${idx + 1}`,
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label: `${initials[idx % 10]}${idx}`,
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disabled: idx % 10 === 0,
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})),
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value: [],
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}
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},
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}
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</script>
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```
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:::
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### 选项分组
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我们可以为选项分组,只需要满足例子里的这个 pattern
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:::demo
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```html
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<template>
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<el-select-v2
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v-model="value"
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filterable
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:options="options"
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placeholder="请选择"
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2021-09-01 13:14:17 +08:00
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style="width: 240px;"
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2021-06-08 14:12:16 +08:00
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multiple
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/>
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</template>
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<script>
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const initials = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j']
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export default {
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data() {
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return {
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options: Array.from({ length: 10 }).map((_, idx) => {
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const label = idx + 1
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return {
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value: `组 ${label}`,
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label: `组 ${label}`,
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options: Array.from({ length: 10 }).map((_, idx) => ({
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value: `选项${idx + 1 + 10 * label}`,
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label: `${initials[idx % 10]}${idx + 1 + 10 * label}`,
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})),
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}
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}),
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value: [],
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}
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},
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}
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</script>
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```
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:::
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### 自定义渲染模板
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我们也可以通过自己自定义模板来渲染自己想要的内容。
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:::demo
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```html
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<template>
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<el-select-v2
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v-model="value"
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filterable
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:options="options"
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placeholder="请选择"
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2021-09-01 13:14:17 +08:00
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style="width: 240px;"
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2021-06-08 14:12:16 +08:00
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multiple
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>
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<template #default="{item}">
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<span style="margin-right: 8px;">{{ item.label }}</span>
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2021-08-26 09:57:56 +08:00
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<span style="color: var(--el-text-color-secondary); font-size: 13px">
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{{ item.value }}
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</span>
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</template>
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</el-select-v2>
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</template>
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<script>
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const initials = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j']
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export default {
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data() {
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return {
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options: Array.from({ length: 1000 }).map((_, idx) => ({
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value: `选项${idx + 1}`,
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label: `${initials[idx % 10]}${idx}`,
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})),
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value: [],
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}
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},
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}
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</script>
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```
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:::
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### 一键清除
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一键删除所有的选项(也可适用于单选)
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:::demo
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```html
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<template>
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<el-select-v2
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v-model="value1"
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:options="options"
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placeholder="请选择"
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2021-09-01 13:14:17 +08:00
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style="width: 240px; margin-right: 16px; vertical-align: middle;"
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2021-06-08 14:12:16 +08:00
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multiple
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clearable
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/>
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<el-select-v2
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v-model="value2"
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:options="options"
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placeholder="请选择"
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2021-09-01 13:14:17 +08:00
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style="width: 240px; vertical-align: middle;"
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2021-06-08 14:12:16 +08:00
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clearable
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/>
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</template>
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<script>
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const initials = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j']
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export default {
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data() {
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return {
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options: Array.from({ length: 1000 }).map((_, idx) => ({
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value: `选项${idx + 1}`,
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label: `${initials[idx % 10]}${idx}`,
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})),
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value1: [],
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value2: '',
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}
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},
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}
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</script>
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```
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:::
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### 创建临时选项
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2021-08-25 17:23:13 +08:00
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可以创建并选中选项中不存在的条目
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:::demo 使用`allow-create`属性即可通过在输入框中输入文字来创建新的条目。注意此时`filterable`必须为真。
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```html
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<template>
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<el-select-v2
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v-model="value1"
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:options="options"
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placeholder="请选择"
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2021-09-01 13:14:17 +08:00
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style="width: 240px; margin-right: 16px; vertical-align: middle;"
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2021-08-25 17:23:13 +08:00
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allow-create
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filterable
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multiple
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clearable
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/>
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<el-select-v2
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v-model="value2"
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:options="options"
|
|
|
|
|
placeholder="请选择"
|
2021-09-01 13:14:17 +08:00
|
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|
|
style="width: 240px; vertical-align: middle;"
|
2021-08-25 17:23:13 +08:00
|
|
|
|
allow-create
|
|
|
|
|
filterable
|
|
|
|
|
clearable
|
|
|
|
|
/>
|
|
|
|
|
</template>
|
|
|
|
|
|
|
|
|
|
<script>
|
|
|
|
|
const initials = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j']
|
|
|
|
|
export default {
|
|
|
|
|
data() {
|
|
|
|
|
return {
|
|
|
|
|
options: Array.from({ length: 1000 }).map((_, idx) => ({
|
|
|
|
|
value: `选项${idx + 1}`,
|
|
|
|
|
label: `${initials[idx % 10]}${idx}`,
|
|
|
|
|
})),
|
|
|
|
|
value1: [],
|
|
|
|
|
value2: '',
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
}
|
|
|
|
|
</script>
|
|
|
|
|
```
|
|
|
|
|
:::
|
2021-06-08 14:12:16 +08:00
|
|
|
|
|
|
|
|
|
### 远程搜索
|
|
|
|
|
|
2021-08-29 09:46:38 +08:00
|
|
|
|
从服务器搜索数据,输入关键字进行查找
|
|
|
|
|
:::demo 为了启用远程搜索,需要将`filterable`和`remote`设置为`true`,同时传入一个`remote-method`。`remote-method`为一个`Function`,它会在输入值发生变化时调用,参数为当前输入值。
|
|
|
|
|
```html
|
|
|
|
|
<template>
|
|
|
|
|
<el-select-v2
|
|
|
|
|
v-model="value"
|
2021-09-01 13:14:17 +08:00
|
|
|
|
style="width: 240px"
|
2021-08-29 09:46:38 +08:00
|
|
|
|
multiple
|
|
|
|
|
size="medium"
|
|
|
|
|
filterable
|
|
|
|
|
remote
|
|
|
|
|
:remote-method="remoteMethod"
|
|
|
|
|
clearable
|
|
|
|
|
:options="options"
|
|
|
|
|
:loading="loading"
|
|
|
|
|
placeholder="请输入关键词"
|
|
|
|
|
/>
|
|
|
|
|
</template>
|
|
|
|
|
|
|
|
|
|
<script>
|
|
|
|
|
export default {
|
|
|
|
|
created() {
|
|
|
|
|
this.list = this.states.map(item => {
|
|
|
|
|
return { value: `value:${item}`, label: `label:${item}` }
|
|
|
|
|
})
|
|
|
|
|
},
|
|
|
|
|
methods: {
|
|
|
|
|
remoteMethod(query) {
|
|
|
|
|
if (query !== '') {
|
|
|
|
|
this.loading = true
|
|
|
|
|
setTimeout(() => {
|
|
|
|
|
this.loading = false
|
|
|
|
|
this.options = this.list.filter(item => {
|
|
|
|
|
return item.label.toLowerCase()
|
|
|
|
|
.indexOf(query.toLowerCase()) > -1
|
|
|
|
|
})
|
|
|
|
|
}, 200)
|
|
|
|
|
} else {
|
|
|
|
|
this.options = []
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
},
|
|
|
|
|
data() {
|
|
|
|
|
return {
|
|
|
|
|
list: [],
|
|
|
|
|
loading: false,
|
|
|
|
|
states: ['Alabama', 'Alaska', 'Arizona',
|
|
|
|
|
'Arkansas', 'California', 'Colorado',
|
|
|
|
|
'Connecticut', 'Delaware', 'Florida',
|
|
|
|
|
'Georgia', 'Hawaii', 'Idaho', 'Illinois',
|
|
|
|
|
'Indiana', 'Iowa', 'Kansas', 'Kentucky',
|
|
|
|
|
'Louisiana', 'Maine', 'Maryland',
|
|
|
|
|
'Massachusetts', 'Michigan', 'Minnesota',
|
|
|
|
|
'Mississippi', 'Missouri', 'Montana',
|
|
|
|
|
'Nebraska', 'Nevada', 'New Hampshire',
|
|
|
|
|
'New Jersey', 'New Mexico', 'New York',
|
|
|
|
|
'North Carolina', 'North Dakota', 'Ohio',
|
|
|
|
|
'Oklahoma', 'Oregon', 'Pennsylvania',
|
|
|
|
|
'Rhode Island', 'South Carolina',
|
|
|
|
|
'South Dakota', 'Tennessee', 'Texas',
|
|
|
|
|
'Utah', 'Vermont', 'Virginia',
|
|
|
|
|
'Washington', 'West Virginia', 'Wisconsin',
|
|
|
|
|
'Wyoming'],
|
|
|
|
|
options: [],
|
|
|
|
|
value: [],
|
|
|
|
|
}
|
|
|
|
|
},
|
|
|
|
|
}
|
|
|
|
|
</script>
|
|
|
|
|
```
|
|
|
|
|
:::
|
2021-06-08 14:12:16 +08:00
|
|
|
|
|
|
|
|
|
### SelectV2 Attributes
|
|
|
|
|
| 参数 | 说明 | 类型 | 可选值 | 默认值 |
|
|
|
|
|
|---------- |-------------- |---------- |-------------------------------- |-------- |
|
|
|
|
|
| model-value / v-model | 绑定值 | string / number / boolean / object | — | — |
|
|
|
|
|
| multiple | 是否多选 | boolean | — | false |
|
|
|
|
|
| disabled | 是否禁用 | boolean | — | false |
|
|
|
|
|
| value-key | 作为 value 唯一标识的键名,绑定值为对象类型时必填 | string | — | value |
|
|
|
|
|
| size | 输入框尺寸 | string | medium/small/mini | — |
|
|
|
|
|
| clearable | 是否可以清空选项 | boolean | — | false |
|
|
|
|
|
| collapse-tags | 多选时是否将选中值按文字的形式展示 | boolean | — | false |
|
|
|
|
|
| multiple-limit | 多选时用户最多可以选择的项目数,为 0 则不限制 | number | — | 0 |
|
|
|
|
|
| name | select input 的 name 属性 | string | — | — |
|
|
|
|
|
| autocomplete | select input 的 autocomplete 属性 | string | — | off |
|
|
|
|
|
| placeholder | 占位符 | string | — | 请选择 |
|
|
|
|
|
| filterable | 是否可搜索 | boolean | — | false |
|
2021-08-29 09:46:38 +08:00
|
|
|
|
| filter-method | 自定义搜索方法 | function | — | — |
|
|
|
|
|
| remote | 是否为远程搜索 | boolean | — | false |
|
|
|
|
|
| remote-method | 远程搜索方法 | function | — | — |
|
2021-08-25 17:23:13 +08:00
|
|
|
|
| allow-create | 是否允许用户创建新条目,需配合 `filterable` 使用 | boolean | — | false |
|
2021-06-08 14:12:16 +08:00
|
|
|
|
| no-data-text | 选项为空时显示的文字,也可以使用`#empty`设置 | string | — | 无数据 |
|
|
|
|
|
| popper-class | Select 下拉框的类名 | string | — | — |
|
|
|
|
|
| popper-append-to-body | 是否将弹出框插入至 body 元素。在弹出框的定位出现问题时,可将该属性设置为 false | boolean | - | false |
|
|
|
|
|
| popper-options | 用户定制化 popper 的行为, 更多请查看文档[popper.js](https://popper.js.org/documentation.html) | object | - | - |
|
|
|
|
|
| automatic-dropdown | 对于不可搜索的 Select,是否在输入框获得焦点后自动弹出选项菜单 | boolean | - | false |
|
|
|
|
|
| clear-icon | 自定义清空图标的类名 | string | — | el-icon-circle-close |
|
2021-07-27 09:09:28 +08:00
|
|
|
|
| height | 面板的高度,每项的高度为34px | number | - | 170 |
|
2021-06-08 14:12:16 +08:00
|
|
|
|
|
|
|
|
|
<span style="display: none;">
|
|
|
|
|
<!-- | no-match-text | 搜索条件无匹配时显示的文字,也可以使用`#empty`设置 | string | — | 无匹配数据 | -->
|
|
|
|
|
<!-- | reserve-keyword | 多选且可搜索时,是否在选中一个选项后保留当前的搜索关键词 | boolean | — | false |
|
|
|
|
|
| default-first-option | 在输入框按下回车,选择第一个匹配项。需配合 `filterable` 或 `remote` 使用 | boolean | - | false |
|
|
|
|
|
| clear-icon | 自定义清空图标的类名 | string | — | el-icon-circle-close |
|
|
|
|
|
| allow-create | 是否允许用户创建新条目,需配合 `filterable` 使用 | boolean | — | false |
|
|
|
|
|
| filter-method | 自定义搜索方法 | function | — | — |
|
|
|
|
|
| remote | 是否为远程搜索 | boolean | — | false |
|
|
|
|
|
| remote-method | 远程搜索方法 | function | — | — |
|
|
|
|
|
| loading | 是否正在从远程获取数据 | boolean | — | false |
|
|
|
|
|
| loading-text | 远程加载时显示的文字 | string | — | 加载中 | -->
|
|
|
|
|
</span>
|
|
|
|
|
|
|
|
|
|
### SelectV2 Events
|
|
|
|
|
| 事件名称 | 说明 | 回调参数 |
|
|
|
|
|
|---------|---------|---------|
|
|
|
|
|
| change | 选中值发生变化时触发 | 目前的选中值 |
|
|
|
|
|
| visible-change | 下拉框出现/隐藏时触发 | 出现则为 true,隐藏则为 false |
|
|
|
|
|
| remove-tag | 多选模式下移除tag时触发 | 移除的tag值 |
|
|
|
|
|
| clear | 可清空的单选模式下用户点击清空按钮时触发 | — |
|
|
|
|
|
| blur | 当 input 失去焦点时触发 | (event: Event) |
|
|
|
|
|
| focus | 当 input 获得焦点时触发 | (event: Event) |
|
|
|
|
|
|
|
|
|
|
### SelectV2 Slots
|
|
|
|
|
| name | 说明 |
|
|
|
|
|
|---------|---------|
|
|
|
|
|
| default | Option 模板 |
|
|
|
|
|
| empty | 无选项时的列表 |
|
|
|
|
|
|
|
|
|
|
<!-- | prefix | Select 组件头部内容 | -->
|