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# bi.expander
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## 某个可以展开的节点,基类[BI.Widget](/core/widget.md)
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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 | combo弹出层位置 | string | top,bottom,left,right,(top,left),(top,right),(bottom,left),(bottom,right) | "bottom"|
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| isDefaultInit | 是否默认初始化子节点 |boolean | true,false | false |
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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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| expanderClass | | string | | "bi-expander-popup" |
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| hoverClass | | string | | "bi-expander-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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| populate | 刷新列表 | items |
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| setValue | 设置combo value值| v |
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| getValue | 获取combo value值 | —|
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| isViewVisible | 弹窗层是否可见 | —|
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| showView | ||
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| hideView |||
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| getView |||
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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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| destroy | 销毁组件| — |
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## 事件
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| 名称 | 说明 |
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| :------ |:------------- |
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|BI.Expander.EVENT_TRIGGER_CHANGE | trigger发生改变触发 |
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|BI.Expander.EVENT_CHANGE | 弹出层点击触发 |
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|BI.Expander.EVENT_EXPAND | Expander展开触发 |
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|BI.Expander.EVENT_COLLAPSE | Expander收起触发
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|BI.Expander.EVENT_AFTER_INIT | Expander初始化后触发 |
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|BI.Expander.EVENT_BEFORE_POPUPVIEW | 下拉列表弹出前触发 |
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|BI.Expander.EVENT_AFTER_POPUPVIEW | 下拉列表弹出后触发 |
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|BI.Expander.EVENT_BEFORE_HIDEVIEW | 下拉列表收起前触发 |
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|BI.Expander.EVENT_AFTER_HIDEVIEW | 下拉列表收起后触发 |
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---
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