Tree树形控件

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

  • parent 1
    • parent 1-0
      • leaf
      • leaf
    • parent 1-1
      • sss

最简单的用法,展示可勾选,可选中,禁用,默认展开等功能。

expand codeexpand code
import { Tree } from 'antd';
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>
    );
  }
}

ReactDOM.render(<Demo />, mountNode);
  • 0-0
    • 0-0-0
      • 0-0-0-0
      • 0-0-0-1
      • 0-0-0-2
    • 0-0-1
    • 0-0-2
  • 0-1
  • 0-2

将节点拖拽到其他节点内部或前后。

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import { Tree } from 'antd';
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'],
  }
  onDragEnter = (info) => {
    console.log(info);
    // expandedKeys 需要受控时设置
    // this.setState({
    //   expandedKeys: info.expandedKeys,
    // });
  }
  onDrop = (info) => {
    console.log(info);
    const dropKey = info.node.props.eventKey;
    const dragKey = info.dragNode.props.eventKey;
    const dropPos = info.node.props.pos.split('-');
    const dropPosition = info.dropPosition - Number(dropPos[dropPos.length - 1]);
    // const dragNodesKeys = info.dragNodesKeys;
    const loop = (data, key, callback) => {
      data.forEach((item, index, arr) => {
        if (item.key === key) {
          return callback(item, index, arr);
        }
        if (item.children) {
          return loop(item.children, key, callback);
        }
      });
    };
    const data = [...this.state.gData];
    let dragObj;
    loop(data, dragKey, (item, index, arr) => {
      arr.splice(index, 1);
      dragObj = item;
    });
    if (info.dropToGap) {
      let ar;
      let i;
      loop(data, dropKey, (item, index, arr) => {
        ar = arr;
        i = index;
      });
      if (dropPosition === -1) {
        ar.splice(i, 0, dragObj);
      } else {
        ar.splice(i + 1, 0, dragObj);
      }
    } else {
      loop(data, dropKey, (item) => {
        item.children = item.children || [];
        // where to insert 示例添加到尾部,可以是随意位置
        item.children.push(dragObj);
      });
    }
    this.setState({
      gData: data,
    });
  }
  render() {
    const loop = data => data.map((item) => {
      if (item.children && item.children.length) {
        return <TreeNode key={item.key} title={item.title}>{loop(item.children)}</TreeNode>;
      }
      return <TreeNode key={item.key} title={item.title} />;
    });
    return (
      <Tree
        className="draggable-tree"
        defaultExpandedKeys={this.state.expandedKeys}
        draggable
        onDragEnter={this.onDragEnter}
        onDrop={this.onDrop}
      >
        {loop(this.state.gData)}
      </Tree>
    );
  }
}

ReactDOM.render(<Demo />, mountNode);
/* You can add the following CSS to your project to make draggable area bigger */
#components-tree-demo-draggable .draggable-tree .ant-tree-node-content-wrapper {
  width: calc(100% - 18px);
}
  • parent 1
    • leaf
    • leaf

可以针对不同的节点定制图标。

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import { Tree, Icon } from 'antd';
const TreeNode = Tree.TreeNode;

class Demo extends React.Component {
  render() {
    return (
      <Tree
        showIcon
        defaultExpandAll
        defaultSelectedKeys={['0-0-0']}
      >
        <TreeNode icon={<Icon type="smile-o" />} title="parent 1" key="0-0">
          <TreeNode icon={<Icon type="meh-o" />} title="leaf" key="0-0-0" />
          <TreeNode
            icon={({ selected }) => (
              <Icon type={selected ? 'frown' : 'frown-o'} />
            )}
            title="leaf"
            key="0-0-1"
          />
        </TreeNode>
      </Tree>
    );
  }
}

ReactDOM.render(<Demo />, mountNode);
  • 0-0
    • 0-0-0
      • 0-0-0-0
      • 0-0-0-1
      • 0-0-0-2
    • 0-0-1
      • 0-0-1-0
      • 0-0-1-1
      • 0-0-1-2
    • 0-0-2
  • 0-1
  • 0-2

受控操作示例

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import { Tree } from 'antd';
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' },
  ],
}, {
  title: '0-2',
  key: '0-2',
}];

class Demo extends React.Component {
  state = {
    expandedKeys: ['0-0-0', '0-0-1'],
    autoExpandParent: true,
    checkedKeys: ['0-0-0'],
    selectedKeys: [],
  }
  onExpand = (expandedKeys) => {
    console.log('onExpand', arguments);
    // if not set autoExpandParent to false, if children expanded, parent can not collapse.
    // or, you can remove all expanded children keys.
    this.setState({
      expandedKeys,
      autoExpandParent: false,
    });
  }
  onCheck = (checkedKeys) => {
    console.log('onCheck', checkedKeys);
    this.setState({ checkedKeys });
  }
  onSelect = (selectedKeys, info) => {
    console.log('onSelect', info);
    this.setState({ selectedKeys });
  }
  renderTreeNodes = (data) => {
    return data.map((item) => {
      if (item.children) {
        return (
          <TreeNode title={item.title} key={item.key} dataRef={item}>
            {this.renderTreeNodes(item.children)}
          </TreeNode>
        );
      }
      return <TreeNode {...item} />;
    });
  }
  render() {
    return (
      <Tree
        checkable
        onExpand={this.onExpand}
        expandedKeys={this.state.expandedKeys}
        autoExpandParent={this.state.autoExpandParent}
        onCheck={this.onCheck}
        checkedKeys={this.state.checkedKeys}
        onSelect={this.onSelect}
        selectedKeys={this.state.selectedKeys}
      >
        {this.renderTreeNodes(treeData)}
      </Tree>
    );
  }
}

ReactDOM.render(<Demo />, mountNode);
  • Expand to load
  • Expand to load
  • Tree Node

点击展开节点,动态加载数据。

expand codeexpand code
import { Tree } from 'antd';
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)}
          </TreeNode>
        );
      }
      return <TreeNode {...item} dataRef={item} />;
    });
  }
  render() {
    return (
      <Tree loadData={this.onLoadData}>
        {this.renderTreeNodes(this.state.treeData)}
      </Tree>
    );
  }
}

ReactDOM.render(<Demo />, mountNode);
  • parent 1
    • parent 1-0
      • leaf
      • leaf
      • leaf
    • parent 1-1
    • parent 1-2

带连接线的树。

expand codeexpand code
import { Tree } from 'antd';
const TreeNode = Tree.TreeNode;

class Demo extends React.Component {
  onSelect = (selectedKeys, info) => {
    console.log('selected', selectedKeys, info);
  }
  render() {
    return (
      <Tree
        showLine
        defaultExpandedKeys={['0-0-0']}
        onSelect={this.onSelect}
      >
        <TreeNode title="parent 1" key="0-0">
          <TreeNode title="parent 1-0" key="0-0-0">
            <TreeNode title="leaf" key="0-0-0-0" />
            <TreeNode title="leaf" key="0-0-0-1" />
            <TreeNode title="leaf" key="0-0-0-2" />
          </TreeNode>
          <TreeNode title="parent 1-1" key="0-0-1">
            <TreeNode title="leaf" key="0-0-1-0" />
          </TreeNode>
          <TreeNode title="parent 1-2" key="0-0-2">
            <TreeNode title="leaf" key="0-0-2-0" />
            <TreeNode title="leaf" key="0-0-2-1" />
          </TreeNode>
        </TreeNode>
      </Tree>
    );
  }
}

ReactDOM.render(<Demo />, mountNode);

API#

Tree props#

参数说明类型默认值
autoExpandParent是否自动展开父节点booleantrue
checkable节点前添加 Checkbox 复选框booleanfalse
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checkablecheckStrictly,它是一个有checkedhalfChecked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[]}[]
checkStrictlycheckable状态下节点选择完全受控(父子节点选中状态不再关联)booleanfalse
defaultCheckedKeys默认选中复选框的树节点string[][]
defaultExpandAll默认展开所有树节点booleanfalse
defaultExpandedKeys默认展开指定的树节点string[][]
defaultExpandParent默认展开父节点booltrue
defaultSelectedKeys默认选中的树节点string[][]
disabled将树禁用boolfalse
draggable设置节点可拖拽(IE>8)booleanfalse
expandedKeys(受控)展开指定的树节点string[][]
filterTreeNode按需筛选树节点(高亮),返回truefunction(node)-
loadData异步加载数据function(node)-
multiple支持点选多个节点(节点本身)booleanfalse
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booleanfalse
showLine是否展示连接线booleanfalse
onCheck点击复选框触发function(checkedKeys, e:{checked: bool, checkedNodes, node, event})-
onDragEnddragend 触发时调用function({event, node})-
onDragEnterdragenter 触发时调用function({event, node, expandedKeys})-
onDragLeavedragleave 触发时调用function({event, node})-
onDragOverdragover 触发时调用function({event, node})-
onDragStart开始拖拽时调用function({event, node})-
onDropdrop 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})-
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})-

TreeNode props#

参数说明类型默认值
disableCheckbox禁掉 checkboxbooleanfalse
disabled禁掉响应booleanfalse
icon自定义图标。可接收组件,props 为当前节点 propsReactNode/Function(props):ReactNode-
isLeaf设置为叶子节点(设置了loadData时有效)booleanfalse
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booleantrue
title标题string|ReactNode'---'

注意#

3.4.0 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'}