doc: add dropdownVisibleChange, close #5195
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@ -55,12 +55,13 @@ Tree selection control.
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### Events
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| Events Name | Description | Arguments |
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| --- | --- | --- |
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| change | A callback function, can be executed when selected treeNodes or input value change | function(value, label, extra) |
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| search | A callback function, can be executed when the search input changes. | function(value: string) |
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| select | A callback function, can be executed when you select a treeNode. | function(value, node, extra) |
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| treeExpand | A callback function, can be executed when treeNode expanded | function(expandedKeys) |
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| Events Name | Description | Arguments | Version |
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| --- | --- | --- | --- |
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| change | A callback function, can be executed when selected treeNodes or input value change | function(value, label, extra) | |
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| search | A callback function, can be executed when the search input changes. | function(value: string) | |
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| select | A callback function, can be executed when you select a treeNode. | function(value, node, extra) | |
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| treeExpand | A callback function, can be executed when treeNode expanded | function(expandedKeys) | |
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| dropdownVisibleChange | Called when dropdown open | function(open) | 3.0 |
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### Tree Methods
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@ -56,12 +56,13 @@ cover: https://gw.alipayobjects.com/zos/alicdn/Ax4DA0njr/TreeSelect.svg
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### 事件
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| 事件名称 | 说明 | 回调参数 |
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| ---------- | ---------------------- | ----------------------------- |
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| change | 选中树节点时调用此函数 | function(value, label, extra) |
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| search | 文本框值变化时回调 | function(value: string) |
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| select | 被选中时调用 | function(value, node, extra) |
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| treeExpand | 展开节点时调用 | function(expandedKeys) |
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| 事件名称 | 说明 | 回调参数 | 版本 |
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| --------------------- | ---------------------- | ----------------------------- | ---- |
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| change | 选中树节点时调用此函数 | function(value, label, extra) | |
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| search | 文本框值变化时回调 | function(value: string) | |
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| select | 被选中时调用 | function(value, node, extra) | |
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| treeExpand | 展开节点时调用 | function(expandedKeys) | |
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| dropdownVisibleChange | 展开下拉菜单的回调 | function(open) | 3.0 |
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### Tree 方法
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