fineui是帆软报表和BI产品线所使用的前端框架。
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# bi.single_tree_combo
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### 二级树下拉框
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{% method %}
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[source](https://jsfiddle.net/fineui/oxkb9uw5/)
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{% common %}
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```javascript
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var tree = BI.createWidget({
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type: "bi.single_tree_combo",
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element: 'body',
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items: [],
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text: "默认值",
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width: 300,
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});
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```
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{% endmethod %}
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### 参数设置
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| 参数 | 说明 | 类型 | 默认值 |
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| ------- | ---- | ------ | ---- |
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| trigger | | object | {} |
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| height | 高度 | number | 30 |
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| text | 文本框值 | string | '' |
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| items | 元素 | array | null |
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### 方法
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| 方法名 | 说明 | 回调参数 |
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| -------- | ---- | ----------- |
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| populate | 刷新内容 | items: 子项数组 |
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| setValue | 设置值 | setValue |
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| getValue | 获取值 | getValue |
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## 事件
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| 事件 | 说明 |
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| :------ |:------------- |
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|BI.SingleTreeCombo.EVENT_BEFORE_POPUPVIEW| 下拉框弹出前触发 |
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其他事件详见[Input](../../base/editor/editor.md)
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---
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