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203 lines
24 KiB
Markdown
203 lines
24 KiB
Markdown
---
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title: Tree
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lang: en-US
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---
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# Tree
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Display a set of data with hierarchies.
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## Basic usage
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Basic tree structure.
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:::demo
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tree/basic
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:::
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## Selectable
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Used for node selection.
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:::demo This example also shows how to load node data asynchronously.
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tree/selectable
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:::
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## Custom leaf node in lazy mode
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:::demo A node's data is not fetched until it is clicked, so the Tree cannot predict whether a node is a leaf node. That's why a drop-down button is added to each node, and if it is a leaf node, the drop-down button will disappear when clicked. That being said, you can also tell the Tree in advance whether the node is a leaf node, avoiding the render of the drop-down button before a leaf node.
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tree/custom-leaf
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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/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. Note that for them to work, `node-key` is required. Its value is the name of a key in the data object, and the value of that key should be unique across the whole tree.
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tree/default-state
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:::
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## Checking tree nodes
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:::demo This example shows how to get and set checked nodes. They both can be done in two approaches: node and key. If you are taking the key approach, `node-key` is required.
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tree/checking-tree
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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 There are two ways to customize template for tree nodes: `render-content` and scoped slot. Use `render-content` to assign a render function that returns the content of tree nodes. See Vue's documentation for a detailed introduction of render functions. If you prefer scoped slot, you'll have access to `node` and `data` in the scope, standing for the TreeNode object and node data of the current node respectively. Note that the `render-content` demo can't run in jsfiddle because it doesn't support JSX syntax. In a real project, `render-content` will work if relevant dependencies are correctly configured.
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tree/customized-node
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:::
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## Custom node class
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The class of tree nodes can be customized
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:::demo. Use `props.class` to build class name of nodes.
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tree/custom-node-class
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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/filtering
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:::
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## Accordion
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Only one node among the same level can be expanded at one time.
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:::demo
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tree/accordion
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:::
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## Draggable
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You can drag and drop Tree nodes by adding a `draggable` attribute.
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:::demo
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tree/draggable
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:::
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## Attributes
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| Attribute | Description | Type | Accepted Values | 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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| node-key | unique identity key name for nodes, its value should be unique across the whole tree | string | — | — |
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| props | configuration options, see the following table | object | — | — |
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| render-after-expand | whether to render child nodes only after a parent node is expanded for the first time | boolean | — | true |
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| load | method for loading subtree data, only works when `lazy` is true | function(node, resolve) | — | — |
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| render-content | render function for tree node | Function(h, `{ node, data, store }`) | — | — |
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| highlight-current | whether current node is highlighted | boolean | — | false |
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| default-expand-all | whether to expand all nodes by default | 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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| auto-expand-parent | whether to expand father node when a child node is expanded | boolean | — | true |
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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-node-method | this function will be executed on each node when use filter method. if return `false`, tree node will be hidden. | Function(value, data, node) | — | — |
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| accordion | whether only one node among the same level can be expanded at one time | boolean | — | false |
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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 component | string / Component | - | - |
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| lazy | whether to lazy load leaf node, used with `load` attribute | boolean | — | false |
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| draggable | whether enable tree nodes drag and drop | boolean | — | false |
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| allow-drag | this function will be executed before dragging a node. If `false` is returned, the node can not be dragged | Function(node) | — | — |
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| allow-drop | this function will be executed before the dragging node is dropped. If `false` is returned, the dragging node can not be dropped at the target node. `type` has three possible values: 'prev' (inserting the dragging node before the target node), 'inner' (inserting the dragging node to the target node) and 'next' (inserting the dragging node after the target node) | Function(draggingNode, dropNode, type) | — | — |
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## props
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| Attribute | Description | Type | Accepted Values | Default |
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| --------- | ----------------------------------------------------------------------------- | ---------------------------- | --------------- | ------- |
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| label | specify which key of node object is used as the node's label | string, function(data, node) | — | — |
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| children | specify which node object is used as the node's subtree | string | — | — |
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| disabled | specify which key of node object represents if node's checkbox is disabled | string, function(data, node) | — | — |
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| isLeaf | specify whether the node is a leaf node, only works when lazy load is enabled | string, function(data, node) | — | — |
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| class | custom node class name | string, function(data, node) | — | — |
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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 | Accept a parameter which will be used as first parameter for filter-node-method |
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| updateKeyChildren | set new data to node, only works when `node-key` is assigned | (key, data) Accept two parameters: 1. key of node 2. new data |
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| getCheckedNodes | If the node can be selected (`show-checkbox` is `true`), it returns the currently selected array of nodes | (leafOnly, includeHalfChecked) Accept two boolean type parameters: 1. default value is `false`. If the parameter is `true`, it only returns the currently selected array of sub-nodes. 2. default value is `false`. If the parameter is `true`, the return value contains halfchecked nodes |
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| setCheckedNodes | set certain nodes to be checked, only works when `node-key` is assigned | an array of nodes to be checked |
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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) Accept a boolean type parameter whose default value is `false`. If the parameter is `true`, it only returns the currently selected array of sub-nodes. |
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| setCheckedKeys | set certain nodes to be checked, only works when `node-key` is assigned | (keys, leafOnly) Accept two parameters: 1. an array of node's keys to be checked 2. a boolean type parameter whose default value is `false`. If the parameter is `true`, it only returns the currently selected array of sub-nodes. |
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| setChecked | set node to be checked or not, only works when `node-key` is assigned | (key/data, checked, deep) Accept three parameters: 1. node's key or data to be checked 2. a boolean typed parameter indicating checked or not. 3. a boolean typed parameter indicating deep or not. |
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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 (null if no node is highlighted) | — |
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| getCurrentNode | return the highlight node's data (null if no node is highlighted) | — |
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| setCurrentKey | set highlighted node by key, only works when `node-key` is assigned | (key, shouldAutoExpandParent=true) 1. the node's key to be highlighted. If `null`, cancel the currently highlighted node 2. whether to automatically expand parent node |
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| setCurrentNode | set highlighted node, only works when `node-key` is assigned | (node, shouldAutoExpandParent=true) 1. the node to be highlighted 2. whether to automatically expand parent node |
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| getNode | get node by data or key | (data) the node's data or key |
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| remove | remove a node, only works when node-key is assigned | (data) the node's data or node to be deleted |
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| append | append a child node to a given node in the tree | (data, parentNode) 1. child node's data to be appended 2. parent node's data, key or node |
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| insertBefore | insert a node before a given node in the tree | (data, refNode) 1. node's data to be inserted 2. reference node's data, key or node |
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| insertAfter | insert a node after a given node in the tree | (data, refNode) 1. node's data to be inserted 2. reference node's data, key or node |
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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 | three parameters: node object corresponding to the node clicked, `node` property of TreeNode, TreeNode itself, event object |
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| node-contextmenu | triggers when a node is clicked by right button | four parameters: event, node object corresponding to the node clicked, `node` property of TreeNode, TreeNode itself |
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| check-change | triggers when the selected state of the node changes | three parameters: node object corresponding to the node whose selected state is changed, whether the node is selected, whether node's subtree has selected nodes |
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| check | triggers after clicking the checkbox of a node | two parameters: node object corresponding to the node that is checked / unchecked, tree checked status object which has four props: checkedNodes, checkedKeys, halfCheckedNodes, halfCheckedKeys |
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| current-change | triggers when current node changes | two parameters: node object corresponding to the current node, `node` property of TreeNode |
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| node-expand | triggers when current node open | three parameters: node object corresponding to the node opened, `node` property of TreeNode, TreeNode itself |
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| node-collapse | triggers when current node close | three parameters: node object corresponding to the node closed, `node` property of TreeNode, TreeNode itself |
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| node-drag-start | triggers when dragging starts | two parameters: node object corresponding to the dragging node, event. |
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| node-drag-enter | triggers when the dragging node enters another node | three parameters: node object corresponding to the dragging node, node object corresponding to the entering node, event. |
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| node-drag-leave | triggers when the dragging node leaves a node | three parameters: node object corresponding to the dragging node, node object corresponding to the leaving node, event. |
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| node-drag-over | triggers when dragging over a node (like mouseover event) | three parameters: node object corresponding to the dragging node, node object corresponding to the dragging over node, event. |
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| node-drag-end | triggers when dragging ends | four parameters: node object corresponding to the dragging node, node object corresponding to the dragging end node (may be `undefined`), node drop type (before / after / inner), event. |
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| node-drop | triggers after the dragging node is dropped | four parameters: node object corresponding to the dragging node, node object corresponding to the dropped node, node drop type (before / after / inner), event. |
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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, data }` |
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