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253 lines
5.7 KiB
Markdown
253 lines
5.7 KiB
Markdown
# TreeSelect 分类选择
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### 介绍
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用于从一组相关联的数据集合中进行选择。
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### 引入
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通过以下方式来全局注册组件，更多注册方式请参考[组件注册](#/zh-CN/advanced-usage#zu-jian-zhu-ce)。
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```js
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import { createApp } from 'vue';
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import { TreeSelect } from 'vant';
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const app = createApp();
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app.use(TreeSelect);
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```
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## 代码演示
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### 单选模式
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`item` 为分类显示所需的数据，数据格式见下方示例。`main-active-index` 表示左侧高亮选项的索引，`active-id` 表示右侧高亮选项的 id。
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```html
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<van-tree-select
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v-model:active-id="state.activeId"
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v-model:main-active-index="state.activeIndex"
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:items="items"
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/>
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```
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```js
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import { reactive } from 'vue';
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export default {
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setup() {
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const state = reactive({
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activeId: 1,
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activeIndex: 0,
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});
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const items = [
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{
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text: '浙江',
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children: [
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{ text: '杭州', id: 1 },
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{ text: '温州', id: 2 },
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],
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},
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{
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text: '江苏',
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children: [
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{ text: '南京', id: 5 },
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{ text: '无锡', id: 6 },
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],
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},
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];
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return {
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state,
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items,
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};
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},
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};
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```
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### 多选模式
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`active-id` 为数组格式时，可以选中多个右侧选项。
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```html
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<van-tree-select
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v-model:active-id="state.activeIds"
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v-model:main-active-index="state.activeIndex"
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:items="items"
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/>
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```
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```js
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import { reactive } from 'vue';
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export default {
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setup() {
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const state = reactive({
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activeId: [1, 2],
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activeIndex: 0,
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});
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const items = [
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{
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text: '浙江',
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children: [
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{ text: '杭州', id: 1 },
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{ text: '温州', id: 2 },
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],
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},
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{
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text: '江苏',
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children: [
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{ text: '南京', id: 5 },
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{ text: '无锡', id: 6 },
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],
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},
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];
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return {
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state,
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items,
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};
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},
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};
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```
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### 自定义内容
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通过 `content` 插槽可以自定义右侧区域的内容。
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```html
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<van-tree-select
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v-model:main-active-index="activeIndex"
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height="55vw"
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:items="items"
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>
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<template #content>
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<van-image
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v-if="activeIndex === 0"
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src="https://img.yzcdn.cn/vant/apple-1.jpg"
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/>
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<van-image
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v-if="activeIndex === 1"
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src="https://img.yzcdn.cn/vant/apple-2.jpg"
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/>
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</template>
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</van-tree-select>
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```
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```js
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import { ref } from 'vue';
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export default {
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setup() {
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const activeIndex = ref(0);
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return {
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activeIndex,
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items: [{ text: '分组 1' }, { text: '分组 2' }],
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};
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},
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};
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```
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### 徽标提示
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设置 `dot` 属性后，会在图标右上角展示一个小红点；设置 `badge` 属性后，会在图标右上角展示相应的徽标。
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```html
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<van-tree-select
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v-model:main-active-index="activeIndex"
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height="55vw"
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:items="items"
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/>
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```
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```js
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import { ref } from 'vue';
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export default {
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setup() {
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const activeIndex = ref(0);
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return {
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activeIndex,
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items: [
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{ text: '浙江', children: [], dot: true },
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{ text: '江苏', children: [], badge: 5 },
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],
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};
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},
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};
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```
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## API
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### Props
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| 参数 | 说明 | 类型 | 默认值 |
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| --- | --- | --- | --- |
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| items | 分类显示所需的数据 | _Item[]_ | `[]` |
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| height | 高度，默认单位为`px` | _number \| string_ | `300` |
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| main-active-index | 左侧选中项的索引 | _number \| string_ | `0` |
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| active-id | 右侧选中项的 id，支持传入数组 | _number \| string \|<br>(number \| string)[]_ | `0` |
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| max | 右侧项最大选中个数 | _number \| string_ | `Infinity` |
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| selected-icon | 自定义右侧栏选中状态的图标 | _string_ | `success` |
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### Events
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| 事件名 | 说明 | 回调参数 |
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| ---------- | -------------------- | ------------------------- |
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| click-nav | 点击左侧导航时触发 | index：被点击的导航的索引 |
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| click-item | 点击右侧选择项时触发 | data: 该点击项的数据 |
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### Slots
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| 名称 | 说明 |
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| ------- | ------------------ |
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| content | 自定义右侧区域内容 |
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### Item 数据结构
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`items` 整体为一个数组，数组内包含一系列描述分类的对象，每个分类里，`text`表示当前分类的名称，`children`表示分类里的可选项。
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```js
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[
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{
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// 导航名称
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text: '所有城市',
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// 导航名称右上角徽标
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badge: 3,
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// 是否在导航名称右上角显示小红点
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dot: true,
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// 导航节点额外类名
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className: 'my-class',
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// 该导航下所有的可选项
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children: [
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{
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// 名称
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text: '温州',
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// id，作为匹配选中状态的标识符
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id: 1,
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// 禁用选项
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disabled: true,
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},
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{
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text: '杭州',
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id: 2,
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},
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],
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},
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];
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```
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### 样式变量
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组件提供了下列 Less 变量，可用于自定义样式，使用方法请参考[主题定制](#/zh-CN/theme)。
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| 名称 | 默认值 | 描述 |
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| ------------------------------------- | ------------------- | ---- |
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| @tree-select-font-size | `@font-size-md` | - |
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| @tree-select-nav-background-color | `@background-color` | - |
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| @tree-select-content-background-color | `@white` | - |
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| @tree-select-nav-item-padding | `14px @padding-sm` | - |
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| @tree-select-item-height | `48px` | - |
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| @tree-select-item-active-color | `@red` | - |
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| @tree-select-item-disabled-color | `@gray-5` | - |
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| @tree-select-item-selected-size | `16px` | - |
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