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# lu-data-select
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# 数据下拉选择组件
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单选、多选，关键词过滤，清空，空数据插槽，标题过长显示省略号
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数据列表较多时，选中再次打开，选中的数据项，自动滚动到可视区域
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# 示例代码
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```javascript
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<template>
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<view class="content">
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<view class="title">1.单选，过滤</view>
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<lu-data-select placeholder="请选择数据" :options="selectData" v-model="condition1" :multiple="false" :filterable="true" @change="onchange"></lu-data-select>
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<view class="title">2.单选，过滤，change返回对象格式</view>
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<lu-data-select placeholder="请选择数据" :options="selectData" v-model="condition1" filterable changeType="objectValue" @change="onchange"></lu-data-select>
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<view class="title">3.多选，过滤</view>
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<lu-data-select placeholder="请选择数据" :options="selectData" v-model="condition" :filterable="true" :multiple="true" @change="onchange"></lu-data-select>
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<view class="title">4.多选，过滤，change返回对象格式</view>
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<lu-data-select
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disabled
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placeholder="请选择数据"
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:options="selectData"
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v-model="condition"
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:filterable="true"
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:multiple="true"
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changeType="objectValue"
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@change="onchange"
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></lu-data-select>
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<view class="title">5.自定义空数据插槽</view>
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<lu-data-select placeholder="请选择数据" :options="selectData1" v-model="condition" :multiple="true" :clearable="true" :filterable="true" @change="onchange">
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<template #empty>
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<view style="text-align: center; padding: 20rpx; color: #f00">空数据插槽</view>
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</template>
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</lu-data-select>
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<view class="title">6.自动判断弹出方向，演示，无需配置</view>
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<lu-data-select placeholder="请选择数据" :options="selectData" v-model="condition" :multiple="true" :clearable="true" :filterable="true" @change="onchange">
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<template #empty>
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<view style="text-align: center; padding: 20rpx; color: #f00">空数据插槽</view>
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</template>
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</lu-data-select>
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<view class="title">7.边框，css的border属性，单选模式选择框高度height，多选默认自动增高</view>
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<lu-data-select
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placeholder="请选择数据"
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:options="selectData"
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v-model="condition1"
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:multiple="false"
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:filterable="true"
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height="100rpx"
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border="1px solid #f00"
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@change="onchange"
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></lu-data-select>
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<view class="title">8.禁用选择</view>
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<lu-data-select placeholder="请选择数据" disabled :options="selectData" v-model="condition1"></lu-data-select>
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</view>
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</template>
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<script setup>
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import { ref, watch } from 'vue';
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const condition1 = ref('8');
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const condition2 = ref('8');
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const condition = ref(['7']); //多选必须是数组格式
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const selectData1 = ref([]);
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const selectData = ref([
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{
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value: '1',
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label: '测试标题测试标题测试标题测试标题测试标题测试标题测试标题1'
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},
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{
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value: '2',
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label: '数据2',
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disabled: true
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},
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{
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value: '3',
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label: '数据3',
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disabled: false
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},
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{
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value: '4',
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label: '数据4',
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disabled: true
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},
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{
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value: '5',
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label: '数据5'
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},
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{
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value: '6',
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label: '数据6'
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},
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{
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value: '7',
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label: '数据7'
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},
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{
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value: '8',
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label: '数据8'
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},
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{
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value: '9',
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label: '数据9'
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},
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{
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value: '10',
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label: '数据10'
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},
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{
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value: '11',
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label: '数据数据数据数据数据数据数据数据数据数据数据数据数据11'
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},
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{
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value: '12',
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label: '数据12'
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},
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{
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value: '13',
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label: '数据列表13'
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}
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]);
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const onchange = (e) => {
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console.log(e);
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};
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</script>
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<style lang="scss" scoped>
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.content {
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padding: 20px;
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.title {
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padding: 10px 0;
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}
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}
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</style>
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```
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# 参数
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| 参数名称 | 类型 | 默认值 | 可选值 | 说明 |
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| ----------- | ------- | ------ | ------------ | ----------------------------- |
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| v-model | String | | | 选中项绑定的值 |
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| options | Array | [ ] | | 数据列表，见下方 options 参数 |
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| labelKey | String | label | | 作为 label 唯一标识的键名 |
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| valueKey | String | value | | 作为 value 唯一标识的键名 |
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| multiple | Boolean | false | true / false | 是否多选 |
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| direction | String | "" | down / up | 弹出方向，up、down, 其他值无效，自动判断方向 |
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| filterable | Boolean | true | true / false | 是否可以筛选 |
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| clearable | Boolean | true | true / false | 是否可以清空 |
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| placeholder | String | 请选择 | | 默认提示语 |
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| disabled | Boolean | false | true / false| 是否禁用选择 |
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| border | String | '1px solid #e5e5e5' | css属性值 | 边框设置 |
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| showEllipsis | Boolean | true | true / false | 选项过长是否显示省略号 |
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| height | String | '35px' | css属性值 | 选择框高度，单选模式有效 |
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| collapseTags | Boolean | false | true / false | 是否折叠 |
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| collapseTagsNum | Number | 1 | | 多少开始折叠 |
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| virtualList | Boolean | false | true / false | 大数据开启虚拟列表 |
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| emptyText | String | 无数据 | | options 为空的时候显示的文本 |
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| changeType | String | " "，可以不传，默认是返回value | "objectValue" | change事件返回的数据格式，默认：单选返回value值，多选返回value组成的数组，objectValue：单选返回对象，多选返回数组对象 |
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# options 参数
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| 名称 | 类型 | 说明 |
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| -------- | --------------- | -------------- |
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| label | String / Number | 选项的标签 |
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| value | String / Number | 选项的值 |
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| disabled | Boolean | 是否禁用该选项 |
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# 事件
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| 事件 | 说明 |
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| ------ | ------------------ |
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| change | 选项发生改变时触发 |
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# 插槽
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| 名称 | 说明 |
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| ----- | ---------------- |
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| empty | 自定义无数据内容 |
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| option| 自定义选项插槽，返回值row：当前选项，$index：当前选项数组下标 |
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