Tree 树形控件
多层次的结构列表。
何时使用
文件夹、组织架构、生物分类、国家地区等等,世间万物的大多数结构都是树形结构。使用 树控件
可以完整展现其中的层级关系,并具有展开收起选择等交互功能。
代码演示
基本
最简单的用法,展示可勾选,可选中,禁用,默认展开等功能。
import React from 'react';
import ReactDOM from 'react-dom';
import { Tree } from 'choerodon-ui';
const TreeNode = Tree.TreeNode;
class Demo extends React.Component {
onSelect = (selectedKeys, info) => {
console.log('selected', selectedKeys, info);
};
onCheck = (checkedKeys, info) => {
console.log('onCheck', checkedKeys, info);
};
render() {
return (
<Tree
checkable
defaultExpandedKeys={['0-0-0', '0-0-1']}
defaultSelectedKeys={['0-0-0', '0-0-1']}
defaultCheckedKeys={['0-0-0', '0-0-1']}
onSelect={this.onSelect}
onCheck={this.onCheck}
>
<TreeNode title="parent 1" key="0-0">
<TreeNode title="parent 1-0" key="0-0-0" disabled>
<TreeNode title="leaf" key="0-0-0-0" disableCheckbox />
<TreeNode title="leaf" key="0-0-0-1" />
</TreeNode>
<TreeNode title="parent 1-1" key="0-0-1">
<TreeNode title={<span style={{ color: '#1890ff' }}>sss</span>} key="0-0-1-0" />
</TreeNode>
</TreeNode>
</Tree>
);
受控操作示例
受控操作示例
import React from 'react';
import ReactDOM from 'react-dom';
import { Tree } from 'choerodon-ui';
const TreeNode = Tree.TreeNode;
const treeData = [
{
title: '0-0',
key: '0-0',
children: [
{
title: '0-0-0',
key: '0-0-0',
children: [
{ title: '0-0-0-0', key: '0-0-0-0' },
{ title: '0-0-0-1', key: '0-0-0-1' },
{ title: '0-0-0-2', key: '0-0-0-2' },
],
},
{
title: '0-0-1',
key: '0-0-1',
children: [
{ title: '0-0-1-0', key: '0-0-1-0' },
{ title: '0-0-1-1', key: '0-0-1-1' },
{ title: '0-0-1-2', key: '0-0-1-2' },
],
},
{
title: '0-0-2',
key: '0-0-2',
},
],
},
{
title: '0-1',
key: '0-1',
children: [
{ title: '0-1-0-0', key: '0-1-0-0' },
{ title: '0-1-0-1', key: '0-1-0-1' },
{ title: '0-1-0-2', key: '0-1-0-2' },
],
},
拖动示例
将节点拖拽到其他节点内部或前后。
import React from 'react';
import ReactDOM from 'react-dom';
import { Tree } from 'choerodon-ui';
const TreeNode = Tree.TreeNode;
const x = 3;
const y = 2;
const z = 1;
const gData = [];
const generateData = (_level, _preKey, _tns) => {
const preKey = _preKey || '0';
const tns = _tns || gData;
const children = [];
for (let i = 0; i < x; i++) {
const key = `${preKey}-${i}`;
tns.push({ title: key, key });
if (i < y) {
children.push(key);
}
}
if (_level < 0) {
return tns;
}
const level = _level - 1;
children.forEach((key, index) => {
tns[index].children = [];
return generateData(level, key, tns[index].children);
});
};
generateData(z);
class Demo extends React.Component {
state = {
gData,
expandedKeys: ['0-0', '0-0-0', '0-0-0-0'],
};
异步数据加载
点击展开节点,动态加载数据。
import React from 'react';
import ReactDOM from 'react-dom';
import { Tree } from 'choerodon-ui';
const TreeNode = Tree.TreeNode;
class Demo extends React.Component {
state = {
treeData: [
{ title: 'Expand to load', key: '0' },
{ title: 'Expand to load', key: '1' },
{ title: 'Tree Node', key: '2', isLeaf: true },
],
};
onLoadData = treeNode => {
return new Promise(resolve => {
if (treeNode.props.children) {
resolve();
return;
}
setTimeout(() => {
treeNode.props.dataRef.children = [
{ title: 'Child Node', key: `${treeNode.props.eventKey}-0` },
{ title: 'Child Node', key: `${treeNode.props.eventKey}-1` },
];
this.setState({
treeData: [...this.state.treeData],
});
resolve();
}, 1000);
});
};
renderTreeNodes = data => {
return data.map(item => {
if (item.children) {
return (
<TreeNode title={item.title} key={item.key} dataRef={item}>
{this.renderTreeNodes(item.children)}
可搜索
可搜索的树。
import React from 'react';
import ReactDOM from 'react-dom';
import { Tree, Input } from 'choerodon-ui';
const TreeNode = Tree.TreeNode;
const Search = Input.Search;
const x = 3;
const y = 2;
const z = 1;
const gData = [];
const generateData = (_level, _preKey, _tns) => {
const preKey = _preKey || '0';
const tns = _tns || gData;
const children = [];
for (let i = 0; i < x; i++) {
const key = `${preKey}-${i}`;
tns.push({ title: key, key });
if (i < y) {
children.push(key);
}
}
if (_level < 0) {
return tns;
}
const level = _level - 1;
children.forEach((key, index) => {
tns[index].children = [];
return generateData(level, key, tns[index].children);
});
};
目录
内置的目录树,multiple
模式支持 ctrl(Windows)
/ command(Mac)
复选。
import React from 'react';
import ReactDOM from 'react-dom';
import { Tree } from 'choerodon-ui';
const { DirectoryTree } = Tree;
const treeData = [
{
title: 'parent 0',
key: '0-0',
children: [
{ title: 'leaf 0-0', key: '0-0-0', isLeaf: true },
{ title: 'leaf 0-1', key: '0-0-1', isLeaf: true },
],
},
{
title: 'parent 1',
key: '0-1',
children: [
{ title: 'leaf 1-0', key: '0-1-0', isLeaf: true },
{ title: 'leaf 1-1', key: '0-1-1', isLeaf: true },
],
},
];
const App = () => {
const onSelect = (keys, event) => {
console.log('Trigger Select', keys, event);
};
const onExpand = () => {
console.log('Trigger Expand');
};
return (
<DirectoryTree
虚拟滚动
使用 height
属性则切换为虚拟滚动。
import React from 'react';
import ReactDOM from 'react-dom';
import { Tree } from 'choerodon-ui';
function dig(path = '0', level = 3) {
const list = [];
for (let i = 0; i < 10; i += 1) {
const key = `${path}-${i}`;
const treeNode = {
title: key,
key,
};
if (level > 0) {
treeNode.children = dig(key, level - 1);
}
list.push(treeNode);
}
return list;
}
const treeData = dig();
ReactDOM.render(<Tree checkable treeData={treeData} height={233} defaultExpandAll />, document.getElementById('container'));
API
Tree props
参数 | 说明 | 类型 | 默认值 |
---|---|---|---|
autoExpandParent | 是否自动展开父节点 | boolean | true |
blockNode | 是否节点占据一行 | boolean | false |
checkable | 节点前添加 Checkbox 复选框 | boolean | false |
checkedKeys | (受控)选中复选框的树节点(注意:父子节点有关联,如果传入父节点 key,则子节点自动选中;相应当子节点 key 都传入,父节点也自动选中。当设置checkable 和checkStrictly ,它是一个有checked 和halfChecked 属性的对象,并且父子节点的选中与否不再关联 | string[] | {checked: string[], halfChecked: string[]} | [] |
checkStrictly | checkable 状态下节点选择完全受控(父子节点选中状态不再关联) | boolean | false |
defaultCheckedKeys | 默认选中复选框的树节点 | string[] | [] |
defaultExpandAll | 默认展开所有树节点 | boolean | false |
defaultExpandedKeys | 默认展开指定的树节点 | string[] | [] |
defaultExpandParent | 默认展开父节点 | bool | true |
defaultSelectedKeys | 默认选中的树节点 | string[] | [] |
disabled | 将树禁用 | bool | false |
draggable | 设置节点可拖拽(IE>8) | boolean | false |
expandedKeys | (受控)展开指定的树节点 | string[] | [] |
filterTreeNode | 按需筛选树节点(高亮),返回 true | function(node) | - |
loadData | 异步加载数据 | function(node) | - |
loadedKeys | (受控)已经加载的节点,需要配合 loadData 使用 | string[] | [] |
multiple | 支持点选多个节点(节点本身) | boolean | false |
selectable | 是否可选中 | boolean | true |
selectedKeys | (受控)设置选中的树节点 | string[] | - |
showIcon | 是否展示 TreeNode title 前的图标,没有默认样式,如设置为 true,需要自行定义图标相关样式 | boolean | false |
switcherIcon | 自定义树节点的展开/折叠图标 | React.ReactElement | - |
showLine | 是否展示连接线 | boolean | false |
onCheck | 点击复选框触发 | function(checkedKeys, e:{checked: bool, checkedNodes, node, event, halfCheckedKeys}) | - |
onDragEnd | dragend 触发时调用 | function({event, node}) | - |
onDragEnter | dragenter 触发时调用 | function({event, node, expandedKeys}) | - |
onDragLeave | dragleave 触发时调用 | function({event, node}) | - |
onDragOver | dragover 触发时调用 | function({event, node}) | - |
onDragStart | 开始拖拽时调用 | function({event, node}) | - |
onDrop | drop 触发时调用 | function({event, node, dragNode, dragNodesKeys}) | - |
onExpand | 展开/收起节点时触发 | function(expandedKeys, {expanded: bool, node}) | - |
onLoad | 节点加载完毕时触发 | function(loadedKeys, {event, node}) | - |
onRightClick | 响应右键点击 | function({event, node}) | - |
onSelect | 点击树节点触发 | function(selectedKeys, e:{selected: bool, selectedNodes, node, event}) | - |
treeData | treeNodes 数据,如果设置则不需要手动构造 TreeNode 节点(key 在整个树范围内唯一) | array<{key, title, children, [disabled, selectable]}> | - |
TreeNode props
参数 | 说明 | 类型 | 默认值 |
---|---|---|---|
checkable | 当树为 checkable 时,设置独立节点是否展示 Checkbox | boolean | - |
disableCheckbox | 禁掉 checkbox | boolean | false |
disabled | 禁掉响应 | boolean | false |
icon | 自定义图标。可接收组件,props 为当前节点 props | ReactNode/Function(props):ReactNode | - |
isLeaf | 设置为叶子节点(设置了loadData 时有效) | boolean | false |
key | 被树的 (default)ExpandedKeys / (default)CheckedKeys / (default)SelectedKeys 属性所用。注意:整个树范围内的所有节点的 key 值不能重复! | string | 内部计算出的节点位置 |
selectable | 设置节点是否可被选中 | boolean | true |
title | 标题 | string|ReactNode | ‘—-‘ |
DirectoryTree props
参数 | 说明 | 类型 | 默认值 |
---|---|---|---|
expandAction | 目录展开逻辑,可选 false ‘click’ ‘doubleClick’ | string | click |
注意
在之前:树节点可以有很多,但在设置checkable
时,将会花费更多的计算时间,因此我们缓存了一些计算结果(this.treeNodesStates
)来复用,避免多次重复计算,以此提高性能。但这也带来了一些限制,当你异步加载树节点时,你需要这样渲染树:
{
this.state.treeData.length ? (
<Tree>
{this.state.treeData.map(data => (
<TreeNode />
))}
</Tree>
) : (
'loading tree'
);
}
FAQ
在 showLine 时,如何隐藏子节点图标?
文件图标通过 switcherIcon 来实现,如果不需要你可以覆盖对应的样式:https://codesandbox.io/s/883vo47xp8
defaultExpandedAll 在异步加载数据时为何不生效?
default
前缀属性只有在初始化时生效,因而异步加载数据时 defaultExpandedAll
已经执行完成。你可以通过受控 expandedKeys
或者在数据加载完成后渲染 Tree 来实现全部展开。
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