ReactJs 0.14 - TreeView

Question

将this example升级到React.js 0.14 .....

切换时收到错误：

  

未捕获的TypeError：无法读取属性＆＃39; setState＆＃39;为null

import React, { Component } from 'react';
import ReactDOM from 'react-dom';
import classNames from 'classnames';
import { Link } from 'react-router';

export default class TreeNode extends Component {

  constructor(props) {
    super(props);
    this.state = {
      visible: true
    };
  }

  render() {
    let childNodes;
    let classObj;

    if (this.props.node.childNodes !== undefined) {
      childNodes = this.props.node.childNodes.map((node, index) => {
        return (
          <li key={ index }><TreeNode node={ node } /></li>
        );
      });
    }

    classObj = classNames({
      'togglable': true,
      'togglable-down': this.state.visible,
      'togglable-up': !this.state.visible
    });

    let style;
    if (!this.state.visible) {
      style = { display: 'none' };
    }

    return (
      <div>
        <h5 onClick={ this.toggle } className={ classObj }>
          { this.props.node.title }
        </h5>
        <ul style={ style } >
          { childNodes }
        </ul>
      </div>
    );
  }

  toggle() {
    this.setState({ visible: !this.state.visible });
  }
}

TreeNode.propTypes = {
  node: React.PropTypes.object
};

ReactDOM.render(<TreeNode node={ treeData } />, document.querySelector('#reactRoot'));

有人看到我的错误吗？

如果你能指出的话，非常感谢。

Answer 1

没关系，愚蠢，愚蠢，愚蠢......

  <h5 onClick={ this.toggle.bind(this) } className={ classObj }>