15 KiB
| title | lang |
|---|---|
| Virtualized Tree | en-US |
Tree V2 virtualized tree
Tree view with blazing fast scrolling performance for any amount of data
Basic usage
Basic tree structure.
:::demo
tree-v2/basic
:::
Selectable
Used for node selection.
:::demo
tree-v2/selectable
:::
:::warning
When using show-checkbox, since check-on-click-leaf is true by default,
last tree children's can be checked by clicking their nodes.
:::
Disabled checkbox
The checkbox of a node can be set as disabled.
:::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.
tree-v2/disabled
:::
Default expanded and default checked
Tree nodes can be initially expanded or checked
:::demo Use default-expanded-keys and default-checked-keys to set initially expanded and initially checked nodes respectively.
tree-v2/default-state
:::
Custom node content
The content of tree nodes can be customized, so you can add icons or buttons as you will
:::demo
tree-v2/custom-node
:::
Custom node class ^(2.9.0)
The class of tree nodes can be customized
:::demo
tree-v2/custom-node-class
:::
Custom node icon ^(2.10.3)
You can customize icons for different node states. Tree nodes expose the expanded property and isLeaf property, allowing you to dynamically render different icons based on the node's state: leaf nodes, expanded nodes, or collapsed nodes.
:::demo
tree-v2/custom-icon
:::
Tree node filtering ^(2.9.1)
The filter-method method can only accept the third parameter after version 2.9.1.
Tree nodes can be filtered
:::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-method is required, and its value is the filtering method.
tree-v2/filter
:::
TreeV2 Attributes
| Name | Description | Type | Default |
|---|---|---|---|
| data | tree data | ^[object]Array<{[key: string]: any}> |
— |
| empty-text | text displayed when data is void | ^[string] | — |
| props | configuration options, see the following table | ^[object] | — |
| highlight-current | whether current node is highlighted | ^[boolean] | false |
| 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 |
| 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 |
| check-on-click-leaf ^(2.9.6) | whether to check or uncheck node when clicking on leaf node (last children). | ^[boolean] | true |
| default-expanded-keys | array of keys of initially expanded nodes | ^[object]Array<string | number> |
— |
| show-checkbox | whether node is selectable | ^[boolean] | false |
| check-strictly | whether checked state of a node not affects its father and child nodes when show-checkbox is true |
^[boolean] | false |
| default-checked-keys | array of keys of initially checked nodes | ^[object]Array<string | number> |
— |
| current-node-key | key of initially selected node | ^[string] / ^[number] | — |
| filter-method | this function will be executed on each node when use filter method. if return false, tree node will be hidden. |
^[Function](query: string, data: TreeNodeData, node: TreeNode) => boolean |
— |
| indent | horizontal indentation of nodes in adjacent levels in pixels | ^[number] | 16 |
| icon | custom tree node icon component | ^[string] / ^[Component] | — |
| item-size ^(2.2.33) | custom tree node height | ^[number] | 26 |
| scrollbar-always-on ^(2.10.4) | always show scrollbar | ^[boolean] | false |
props
| Attribute | Description | Type | Default |
|---|---|---|---|
| value | unique identity key name for nodes, its value should be unique across the whole tree | ^[string] | id |
| label | specify which key of node object is used as the node's label | ^[string] | label |
| children | specify which node object is used as the node's subtree | ^[string] | children |
| disabled | specify which key of node object represents if node's checkbox is disabled | ^[string] | disabled |
| class ^(2.9.0) | custom node class name | ^[string] / ^[Function](data: TreeNodeData, node: TreeNode) => string | {[key: string]: boolean} |
— |
TreeV2 Method
Tree has the following method, which returns the currently selected array of nodes.
| Method | Description | Parameters |
|---|---|---|
| filter | filter all tree nodes, filtered nodes will be hidden | (query: string) |
| getCheckedNodes | If the node can be selected (show-checkbox is true), it returns the currently selected array of nodes |
(leafOnly: boolean) |
| getCheckedKeys | If the node can be selected (show-checkbox is true), it returns the currently selected array of node's keys |
(leafOnly: boolean) |
| setCheckedKeys | set certain nodes to be checked | (keys: TreeKey[]) |
| setChecked | set node to be checked or not | (key: TreeKey, checked: boolean) |
| setExpandedKeys | set certain nodes to be expanded | (keys: TreeKey[]) |
| getHalfCheckedNodes | If the node can be selected (show-checkbox is true), it returns the currently half selected array of nodes |
— |
| getHalfCheckedKeys | If the node can be selected (show-checkbox is true), it returns the currently half selected array of node's keys |
— |
| getCurrentKey | return the highlight node's key (undefined if no node is highlighted) | — |
| getCurrentNode | return the highlight node's data (undefined if no node is highlighted) | — |
| setCurrentKey | set highlighted node by key | (key: TreeKey) |
| getNode | get node by key or data | (data: TreeKey | TreeNodeData) |
| expandNode | expand specified node | (node: TreeNode) |
| collapseNode | collapse specified node | (node: TreeNode) |
| 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) |
| scrollTo ^(2.8.0) | scroll to a given position | (offset: number) |
| scrollToNode ^(2.8.0) | scroll to a given tree key with specified scroll strategy | (key: TreeKey, strategy?: auto | smart | center | start | end) |
TreeV2 Events
| Name | Description | Parameters |
|---|---|---|
| node-click | triggers when a node is clicked | (data: TreeNodeData, node: TreeNode, e: MouseEvent) |
| node-drop ^(2.8.3) | triggers when drag something and drop on a node | (data: TreeNodeData, node: TreeNode, e: DragEvent) |
| node-contextmenu | triggers when a node is clicked by right button | (e: Event, data: TreeNodeData, node: TreeNode) |
| check-change | triggers when the selected state of the node changes | (data: TreeNodeData, checked: boolean) |
| check | triggers after clicking the checkbox of a node | (data: TreeNodeData, info: { checkedKeys: TreeKey[],checkedNodes: TreeData, halfCheckedKeys: TreeKey[], halfCheckedNodes: TreeData,}) |
| current-change | triggers when current node changes | (data: TreeNodeData, node: TreeNode) |
| node-expand | triggers when current node open | (data: TreeNodeData, node: TreeNode) |
| node-collapse | triggers when current node close | (data: TreeNodeData, node: TreeNode) |
TreeV2 Slots
| Name | Description |
|---|---|
| - | Custom content for tree nodes. The scope parameter is { node: TreeNode, data: TreeNodeData } |
| empty ^(2.9.0) | empty you can customize content when data is empty. |