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132 lines
8.9 KiB
Markdown
132 lines
8.9 KiB
Markdown
---
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title: Virtualized Tree
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lang: en-US
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---
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# <ElBadge value="beta">Tree V2 virtualized tree</ElBadge>
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Tree view with blazing fast scrolling performance for any amount of data
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## Basic usage
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Basic tree structure.
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:::demo
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tree-v2/basic
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:::
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## Selectable
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Used for node selection.
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:::demo
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tree-v2/selectable
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:::
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## Disabled checkbox
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The checkbox of a node can be set as disabled.
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:::demo In the example, `disabled` property is declared in defaultProps, and some nodes are set as `disabled: true`. The corresponding checkboxes are disabled and can't be clicked.
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tree-v2/disabled
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:::
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## Default expanded and default checked
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Tree nodes can be initially expanded or checked
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:::demo Use `default-expanded-keys` and `default-checked-keys` to set initially expanded and initially checked nodes respectively.
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tree-v2/default-state
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:::
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## Custom node content
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The content of tree nodes can be customized, so you can add icons or buttons as you will
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:::demo
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tree-v2/custom-node
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:::
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## Tree node filtering
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Tree nodes can be filtered
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:::demo Invoke the `filter` method of the Tree instance to filter tree nodes. Its parameter is the filtering keyword. Note that for it to work, `filter-node-method` is required, and its value is the filtering method.
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tree-v2/filter
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:::
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## Attributes
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| Attribute | Description | Type | Default |
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| --------------------- | -------------------------------------------------------------------------------------------------------------------------------------------- | --------------------- | ------- |
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| data | tree data | array | — |
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| empty-text | text displayed when data is void | string | — |
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| props | configuration options, see the following table | object | — |
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| highlight-current | whether current node is highlighted | boolean | false |
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| expand-on-click-node | whether to expand or collapse node when clicking on the node, if false, then expand or collapse node only when clicking on the arrow icon. | boolean | true |
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| check-on-click-node | whether to check or uncheck node when clicking on the node, if false, the node can only be checked or unchecked by clicking on the checkbox. | boolean | false |
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| default-expanded-keys | array of keys of initially expanded nodes | array | — |
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| show-checkbox | whether node is selectable | boolean | false |
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| check-strictly | whether checked state of a node not affects its father and child nodes when `show-checkbox` is `true` | boolean | false |
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| default-checked-keys | array of keys of initially checked nodes | array | — |
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| current-node-key | key of initially selected node | string, number | — |
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| filter-method | this function will be executed on each node when use filter method. if return `false`, tree node will be hidden. | Function(value, data) | — |
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| indent | horizontal indentation of nodes in adjacent levels in pixels | number | 16 |
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| icon | custome tree node icon | string / Component | - |
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## props
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| Attribute | Description | Type | Default |
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| --------- | ------------------------------------------------------------------------------------ | -------------- | -------- |
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| value | unique identity key name for nodes, its value should be unique across the whole tree | string, number | id |
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| label | specify which key of node object is used as the node's label | string | label |
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| children | specify which node object is used as the node's subtree | string | children |
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| disabled | specify which key of node object represents if node's checkbox is disabled | string | disabled |
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## Method
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`Tree` has the following method, which returns the currently selected array of nodes.
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| Method | Description | Parameters |
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| --------------- | ---------------------------------------- | ---------------------------------------- |
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| filter | filter all tree nodes, filtered nodes will be hidden | `(query: string)` |
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| getCheckedNodes | If the node can be selected (`show-checkbox` is `true`), it returns the currently selected array of nodes | `(leafOnly: boolean)` |
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| getCheckedKeys | If the node can be selected (`show-checkbox` is `true`), it returns the currently selected array of node's keys | `(leafOnly: boolean)` |
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| setCheckedKeys | set certain nodes to be checked | `(keys: TreeKey[])` |
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| setChecked | set node to be checked or not | `(key: TreeKey, checked: boolean)` |
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| getHalfCheckedNodes | If the node can be selected (`show-checkbox` is `true`), it returns the currently half selected array of nodes | - |
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| getHalfCheckedKeys | If the node can be selected (`show-checkbox` is `true`), it returns the currently half selected array of node's keys | - |
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| getCurrentKey | return the highlight node's key (undefined if no node is highlighted) | - |
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| getCurrentNode | return the highlight node's data (undefined if no node is highlighted) | - |
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| setCurrentKey | set highlighted node by key | `(key: TreeKey)` |
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| setData | When the data is very large, using reactive data will cause the poor performance, so we provide a way to avoid this situation | `(data: TreeData)` |
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## Events
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| Event Name | Description | Parameters |
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| ---------------- | ---------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------- |
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| node-click | triggers when a node is clicked | `(data: TreeNodeData, node: TreeNode, e: MouseEvent)` |
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| node-contextmenu | triggers when a node is clicked by right button | `(e: Event, data: TreeNodeData, node: TreeNode)` |
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| check-change | triggers when the selected state of the node changes | `(data: TreeNodeData, checked: boolean)` |
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| check | triggers after clicking the checkbox of a node | `(data: TreeNodeData, info: { checkedKeys: TreeKey[],checkedNodes: TreeData, halfCheckedKeys: TreeKey[], halfCheckedNodes: TreeData,})` |
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| current-change | triggers when current node changes | `(data: TreeNodeData, node: TreeNode)` |
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| node-expand | triggers when current node open | `(data: TreeNodeData, node: TreeNode)` |
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| node-collapse | triggers when current node close | `(data: TreeNodeData, node: TreeNode)` |
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## Slots
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| Name | Description |
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| ---- | ---------------------------------------------------------------------------------------------- |
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| - | Custom content for tree nodes. The scope parameter is `{ node: TreeNode, data: TreeNodeData }` |
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