javascript - React JS + Material UI 抛出 leftNav 未定义

Question

我尝试使用 Material UI 实现 React JS，但遇到了左侧导航栏切换行为的问题。

我已使用 Yeoman 命令创建了组件。

有2个组件

BodyComponent - 父级

HeaderCompoent-子级

在 Body 组件中，我创建了 menuItem 和 LeftNavBar，在 HeaderComponent 中，我使用 onLeftIconButtonTouchTap={this._handleTouch} 事件创建了 AppBar，但是当我单击汉堡包图标时，它会抛出 navLeft is undefined 。

根据我的理解，这里的问题是在子级上调用事件，而 LeftNavBar 的引用在父级中，不知何故我无法访问它。

我读到这些问题都可以解决，但是将所有组件放在一起而不是分开，但我不想将其分开，我也不想使用助焊剂来解决这一问题。

有什么好的解决办法吗？或者我必须改变我编写代码的方式吗？如果是，怎么做？

主体组件

/*jshint esnext: true */
'use strict';

import React from 'react';
import mui from 'material-ui';
import Header from './HeaderComponent';

require('styles//Body.sass');

const LeftNav = require('material-ui/lib/left-nav');
const Tabs = require('material-ui/lib/tabs/tabs');
const Tab = require('material-ui/lib/tabs/tab');
const MenuItem = mui.MenuItem;

// injectTapEventPlugin = require("react-tap-event-plugin");
// injectTapEventPlugin();


var menuItems = [{
  route: 'device',
  text: 'Device'
}, {
  type: MenuItem.Types.SUBHEADER,
  text: 'xyz'
}, {
  route: 'xyz1',
  text: 'xyz1'
}, {
  route: 'xyz2',
  text: 'xyz2'
}, {
  route: 'xyz3',
  text: 'xyz3'
}, {
  type: MenuItem.Types.LINK,
  payload: 'https://github.com/callemall/material-ui',
  text: 'GitHub'
}, {
  text: 'Disabled',
  disabled: true
}, {
  type: MenuItem.Types.LINK,
  payload: 'https://www.google.com',
  text: 'Disabled Link',
  disabled: true
}];


class BodyComponent extends React.Component {

  render() {
    return (
      < div className = "body-component" >
      < LeftNav ref = "leftNav"
        header = { < Header / > }
        docked = { true }
        menuItems = { menuItems }/>
      < Tabs >
        < Tab label = "Item One" >
        (Tab content...)
        < /Tab>
        < Tab label = "Item Two" >
        (Tab content...)
        < /Tab>
        < Tab label = "Item Three"
        route = "home"
        onActive = {
          this._handleTabActive
        }>
        </ Tab>
      < /Tabs>
      < /div>
    );
  }
}

BodyComponent.displayName = 'BodyComponent';

// Uncomment properties you need
// BodyComponent.propTypes = {};
// BodyComponent.defaultProps = {};

export default BodyComponent;

标题组件

/*jshint esnext: true */
'use strict';

import React from 'react';
import Body from './BodyComponent';
import mui from 'material-ui';
const AppBar = require('material-ui/lib/app-bar');

//import ActionCreator from '../actions/AppBarActionCreators';
const injectTapEventPlugin = require("react-tap-event-plugin");
injectTapEventPlugin();


require('styles//Header.sass');


class HeaderComponent extends React.Component {

  _handleTouch() {
    console.log(this);
    this.refs.leftNav.toggle();
  }

  render() {
    return (
      <div className="header-component">
      < AppBar title = "vEDM"
      onLeftIconButtonTouchTap={this._handleTouch}
      iconClassNameRight = "muidocs-icon-navigation-expand-more" / >
      </div>
    );
  }
}
HeaderComponent.displayName = 'HeaderComponent';

export default HeaderComponent;

Answer 1

在 BodyComponent 中，您可以创建一个函数来切换 leftNav 并将其作为 Header 中的 props 传递

正文

class BodyComponent extends React.Component {

  toggleLeftNav() {
    this.refs.leftNav.toggle();
  }

  render() {
    return (
      < div className = "body-component" >
      < LeftNav ref = "leftNav"
        header = { < Header toggleLeftNav={ this.toggleLeftNav.bind(this) } /> }
        docked = { true }
        menuItems = { menuItems }/>
      < Tabs >
        < Tab label = "Item One" >
        (Tab content...)
        < /Tab>
        < Tab label = "Item Two" >
        (Tab content...)
        < /Tab>
        < Tab label = "Item Three"
        route = "home"
        onActive = {
          this._handleTabActive
        }>
        </ Tab>
      < /Tabs>
      < /div>
    );
  }
}

标题

class HeaderComponent extends React.Component {

  _handleTouch() {
       this.props.toggleLeftNav();
  }

  render() {
    return (
      <div className="header-component">
      < AppBar title = "vEDM"
      onLeftIconButtonTouchTap={this._handleTouch.bind(this)}
      iconClassNameRight = "muidocs-icon-navigation-expand-more" / >
      </div>
    );
  }
}