element-plus/docs/en-US/component/tree.md
Aex 883fd8d6ef
epic: refactor icons (#3492)
* refactor(components): el-alert icon (#3441)

* refactor(components): el-alert icon

* fix: el-alert test

* fix: [el-alert] lint error

* feat(utils): add icon util

* refactor(components): el-alert icon

* refactor(utils): icon

* test: update alert test

* refactor: remove el-icon in util

* refactor(components): el-notification icon (#3512)

* chore: temp save changes

* refactor: update icon

* fix: var

* docs: update icon

* fix: type class error

* style: remove unused class

* fix: update icon type

* docs: update icon

* fix: update iconComponent

* refactor(components): el-dialog icon (#3505)

* refactor(components): [el-dialog] icon

* fix: typo

* refactor: dialog icon ref

* refactor: dialog icon

* style: update close button size

* refactor(components): el-message-box icon (#3507)

* refactor(components): message-box icon

* refactor(components): message icon

* fix: test

* refactor: update ref

* fix: test

* docs: update icon

* fix: delete unused code

* docs: update type

* fix: update close button size

* fix: type

* fix: icon type class

* fix: icon type

* fix: update type class

* refactor(components): el-popconfirm icon (#3513)

* refactor(components): el-popconfirm icon

* fix: space styles

* docs: update example

* docs: update example for trigger event

* refactor(components): el-page-header icon (#3518)

* refactor(components): el-page-header icon

* docs: update icon

* fix: space errors

* refactor(components): el-steps icon (#3520)

* refactor(components): el-backtop icon (#3514)

* refactor(components): el-backtop icon

* fix: update font size

* refactor(components): el-button icon (#3536)

* refactor(components): el-button icon

* fix: update example

* refactor(components): el-button icon

* refactor: style simplify

Co-authored-by: imswk <syfzxx@vip.qq.com>

* refactor(components): el-tree icon (#3590)

Co-authored-by: qianjie <qianjie@patsnap.com>

* refactor(components): el-avatar icon (#3599)

Co-authored-by: qianjie <qianjie@patsnap.com>

* refactor(components): el-carousel icon (#3602)

Co-authored-by: qianjie <qianjie@patsnap.com>

* refactor(components): el-progress icon (#3607)

Co-authored-by: qianjie <qianjie@patsnap.com>

* refactor(components): el-result icon (#3609)

Co-authored-by: qianjie <qianjie@patsnap.com>

* refactor(components): el-timeline icon (#3646)

Co-authored-by: qianjie <qianjie@patsnap.com>

* refactor(components): el-table icon (#3611)

Co-authored-by: qianjie <qianjie@patsnap.com>

* chore: add vue to gitignore

* fix: buildProp error

* refactor(components): el-pagination icon (#3605)

* test: el-menu deprecated icon font (#3794)

* test: el-loading deprecated icon font (#3795)

* chore: Update changelog 1.1.0-beta.20 (#3838)

* fix: about custom extension of table column (#3437)

* refactor(components): el-autocomplete icon (#3783)

* refactor(components): el-dropdown icon (#3517)

* refactor(components): el-dropdown icon

* fix: arrow down icon size

* style: revert

* fix: font-size

* refactor(components): el-link icon (#3538)

* refactor(components): el-link icon

* refactor: update example

* fix: import icons

* docs: add tip

* refactor: update link icon

* fix: icon align

* fix: typo

* refactor(components): el-select icon (#3780)

* refactor(components): el-input icon (#3565)

* refactor(components): input icon

* docs: update example

* refactor(components): el-select icon

* docs: icon usage

* fix: input style

* fix: add scoped

* docs: fix icon

* fix: icon align

* fix: icon align

* fix: typo

* fix: typo

* refactor(components): el-input-number icon (#3566)

* refactor(components): el-input-number icon

* fix: icon align

* refactor(components): el-tag icon (#3793)

* refactor(components): el-tag icon

* fix: icon align

* fix: icon margin

* refactor(components): el-switch icon (#3787)

* refactor(components): el-switch icon

* fix: icon align

* docs: add icon usage

* refactor(components): el-collapse icon (#3788)

* refactor(components): el-collapse icon

* docs: update icon demo

* fix: typo

* refactor(components): el-uplod icon (#3598)

* refactor(components): el-uplod icon

* docs: update icon useage

* docs: fix icon

* docs: fix icon

* docs: update upload-filled icon

* fix: icon align

* fix: item icon align

* refactor(components): el-select-v2 icon (#3781)

* refactor(components): el-select-v2 icon

* revert: play/main.ts

* fix: icon style

* fix: icon solt

* refactor(components): el-cascader icon (#3785)

* refactor(components): input icon

* docs: update example

* refactor(components): el-select icon

* refactor(components): el-cascader icon

* refactor(components): el-tag icon

* fix: icon align

* fix: icon margin

* docs: icon usage

* fix: input style

* fix: add scoped

* test: remove unuesd code

* fix: cascader-panel

* fix: icon style

* fix: icon animation

* refactor(components): el-drawer icon (#3796)

* refactor(components): el-drawer icon

* fix: close icon size

* fix: close icon align

* refactor(components): el-transfer icon (#3792)

* refactor(components): el-transfer icon

* fix: icon align

* refactor(components): el-image-viewer icon (#3797)

* refactor(components): el-image-view icon

* fix: icon size

* docs: update domo

* style: format vue

* fix: fullscreen icon

* Add cursor for icons

Co-authored-by: jeremywuuuuu <15975785+JeremyWuuuuu@users.noreply.github.com>

* refactor(components): rate-icon (#3891)

* refactor(components): el-rate icon

* docs: update example

* docs: update

* test: update

* docs: update

* fix: variable rename

* fix: demo update

* fix: allow half bug

* refactor(components): el-time-picker icon (#3834)

* refactor(components): el-button icon

* refactor(components): date-picker icon

* refactor(components): input icon

* docs: update example

* refactor(components): el-select icon

* refactor(components): el-time-select icon

* fix: icon width

* docs: icon usage

* fix: input style

* fix: add scoped

* fix: icon size

* docs: icon display

* fix: icon in button

* docs: fix error

* refactor(components): el-time-picker icon

* fix: var

* fix: icon align

* test: delete unused code

* test: fix error

* fix: remove unused code

* docs: fix typo

* docs: update icon

* fix: default prefix icon

* fix: range picker icon align

* Update cursor for picker

Co-authored-by: jeremywuuuuu <15975785+JeremyWuuuuu@users.noreply.github.com>

* fix(components): el-input close icon

* chore: delete fonts

* fix: copy full style

Co-authored-by: imswk <syfzxx@vip.qq.com>
Co-authored-by: bastarder <85257684@qq.com>
Co-authored-by: qianjie <qianjie@patsnap.com>
Co-authored-by: Element <wallement@gmail.com>
Co-authored-by: Alan Wang <948467222@qq.com>
Co-authored-by: jeremywuuuuu <15975785+JeremyWuuuuu@users.noreply.github.com>
2021-10-27 23:17:13 +08:00

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Markdown

---
title: Tree
lang: en-US
---
# Tree
Display a set of data with hierarchies.
## Basic usage
Basic tree structure.
:::demo
tree/basic
## Selectable
Used for node selection.
:::demo This example also shows how to load node data asynchronously.
tree/selectable
:::
## Custom leaf node in lazy mode
:::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.
tree/custom-leaf
:::
## 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/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. 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.
tree/default-state
:::
## Checking tree nodes
:::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.
tree/checking-tree
:::
## Custom node content
The content of tree nodes can be customized, so you can add icons or buttons as you will
:::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.
tree/customized-node
:::
## Tree node filtering
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-node-method` is required, and its value is the filtering method.
tree/filtering
:::
## Accordion
Only one node among the same level can be expanded at one time.
:::demo
tree/accordion
:::
## Draggable
You can drag and drop Tree nodes by adding a `draggable` attribute.
:::demo
tree/draggable
:::
## Attributes
| Attribute | Description | Type | Accepted Values | Default |
| --------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------- | --------------- | ------- |
| data | tree data | array | — | — |
| empty-text | text displayed when data is void | string | — | — |
| node-key | unique identity key name for nodes, its value should be unique across the whole tree | string | — | — |
| props | configuration options, see the following table | object | — | — |
| render-after-expand | whether to render child nodes only after a parent node is expanded for the first time | boolean | — | true |
| load | method for loading subtree data, only works when `lazy` is true | function(node, resolve) | — | — |
| render-content | render function for tree node | Function(h, { node, data, store }) | — | — |
| highlight-current | whether current node is highlighted | boolean | — | false |
| default-expand-all | whether to expand all nodes by default | 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 |
| auto-expand-parent | whether to expand father node when a child node is expanded | boolean | — | true |
| default-expanded-keys | array of keys of initially expanded nodes | array | — | — |
| 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 | array | — | — |
| current-node-key | key of initially selected node | string, number | — | — |
| 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) | — | — |
| accordion | whether only one node among the same level can be expanded at one time | boolean | — | false |
| indent | horizontal indentation of nodes in adjacent levels in pixels | number | — | 16 |
| icon | custome tree node icon component | string / Component | - | - |
| lazy | whether to lazy load leaf node, used with `load` attribute | boolean | — | false |
| draggable | whether enable tree nodes drag and drop | boolean | — | false |
| allow-drag | this function will be executed before dragging a node. If `false` is returned, the node can not be dragged | Function(node) | — | — |
| 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) | — | — |
## props
| Attribute | Description | Type | Accepted Values | Default |
| --------- | ----------------------------------------------------------------------------- | ----------------------------- | --------------- | ------- |
| label | specify which key of node object is used as the node's label | string, function(data, node) | — | — |
| children | specify which node object is used as the node's subtree | string | — | — |
| disabled | specify which key of node object represents if node's checkbox is disabled | boolean, function(data, node) | — | — |
| isLeaf | specify whether the node is a leaf node, only works when lazy load is enabled | boolean, function(data, node) | — | — |
## 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 | Accept a parameter which will be used as first parameter for filter-node-method |
| 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 |
| 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 |
| setCheckedNodes | set certain nodes to be checked, only works when `node-key` is assigned | an array of nodes to be checked |
| 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. |
| 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. |
| 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. |
| 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 (null if no node is highlighted) | — |
| getCurrentNode | return the highlight node's data (null if no node is highlighted) | — |
| 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 |
| 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 |
| getNode | get node by data or key | (data) the node's data or key |
| remove | remove a node, only works when node-key is assigned | (data) the node's data or node to be deleted |
| 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 |
| 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 |
| 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 |
## Events
| Event Name | Description | Parameters |
| ---------------- | --------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| node-click | triggers when a node is clicked | three parameters: node object corresponding to the node clicked, `node` property of TreeNode, TreeNode itself |
| 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 |
| 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 |
| 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 |
| current-change | triggers when current node changes | two parameters: node object corresponding to the current node, `node` property of TreeNode |
| node-expand | triggers when current node open | three parameters: node object corresponding to the node opened, `node` property of TreeNode, TreeNode itself |
| node-collapse | triggers when current node close | three parameters: node object corresponding to the node closed, `node` property of TreeNode, TreeNode itself |
| node-drag-start | triggers when dragging starts | two parameters: node object corresponding to the dragging node, event. |
| 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. |
| 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. |
| 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. |
| 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. |
| 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. |
## Slots
| Name | Description |
| ---- | -------------------------------------------------------------------- |
| — | Custom content for tree nodes. The scope parameter is { node, data } |