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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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{% method %}
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[source](https://jsfiddle.net/fineui/2xavqk4k/)
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{% common %}
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```javascript
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BI.createWidget({
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type: "bi.expander",
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element: "#wrapper",
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el: {
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type: "bi.icon_text_node",
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cls: "pull-right-ha-font",
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height: 25,
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text: "Expander"
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},
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popup: {
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items: [{
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type: "bi.single_select_item",
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height: 25,
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text: "项目1",
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value: 1
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}, {
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type: "bi.single_select_item",
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height: 25,
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text: "项目2",
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value: 2
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}]
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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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| el | 自定义下拉框trigger | object | — |{ }|
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| trigger | 下拉列表的弹出方式 | string | click,hover | "click" |
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| adjustLength | 弹出列表和trigger的距离 | number | — | 0 |
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| toggle | 切换状态 | boolean | true,false | true |
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| direction | 弹出列表和trigger的位置关系 | 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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| popup | 弹出层 | object | — | { }|
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| expanderClass | 展开类 | string | —| "bi-expander-popup" |
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| hoverClass | hover类| 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 | 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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| 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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