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