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# bi.switcher
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## 切换显示或隐藏面板,[BI.Widget](/core/widget.md)
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{% method %}
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[source](https://jsfiddle.net/fineui/4sj60ap0/)
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{% common %}
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```javascript
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BI.createWidget({
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element: "#wrapper",
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type: "bi.switcher",
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el: {
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type: "bi.button",
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height: 25,
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text: "Switcher"
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},
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popup: {
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},
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adapter: {
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}
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})
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```
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{% endmethod %}
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## API
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##### 基础属性
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| 参数 | 说明 | 类型 | 可选值 | 默认值
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| :------ |:------------- | :-----| :----|:----
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| trigger | 事件类型 | string | | "click" |
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| toggle | 切换状态 | boolean | true,false | true |
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| direction | 面板显示的位置 | string | — | BI.Direction.Top |
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| el | 开启弹出层的元素 | object | — | { }|
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| popup | 弹出层 | object | — |{ }|
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| adapter | 弹出层的位置 | object | — | null|
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| masker | masker层 | | — | { }|
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| switcherClass | — | string| —| "bi-switcher-popup" |
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| hoverClass | - | string | - | "bi-switcher-hover" |
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## 对外方法
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| 名称 | 说明 | 回调参数
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| :------ |:------------- | :-----
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| setValue | 设置value值 | value |
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| getValue | 获取被选中的值 |—|
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| empty| 清空组件|—|
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| destroy| 销毁组件|—|
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| populate | 刷新列表 | items |
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| isViewVisible | 弹窗层是否可见 | —|
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| showView | 显示弹出层 | —|
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| hideView | 隐藏弹出层|—|
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| getView | 获取弹出层|—|
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| getAllLeaves | 获取所有的叶子节点 | —|
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| getNodeById | 根据id获取节点 | id |
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| getNodeByValue | 根据value值获取节点 | value |
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| isExpanded | 节点是否展开 |— |
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| setAdapter | 设置弹出层显示的位置元素|adapter|
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| adjustView| 调整弹出层显示的位置元素 |—|
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## 事件方法
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| 事件名称| 说明| 回调参数 |
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| :------ |:------------- | :-----
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| EVENT_EXPAND | 面板展开 | —|
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| EVENT_COLLAPSE | 面板收起 | —|
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| EVENT_TRIGGER_CHANGE | 面板切换 | —|
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| EVENT_AFTER_INIT | 初始化之后 | —|
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| EVENT_BEFORE_POPUPVIEW | 面板显示之前| —|
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| EVENT_AFTER_POPUPVIEW | 面板显示之后| —|
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| EVENT_BEFORE_HIDEVIEW | 面板隐藏之前| —|
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| EVENT_AFTER_HIDEVIEW | 面板隐藏之后 | —|
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---
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