ElementGroup.js

import React from 'react'
import Element from './Element'
import ReactAddonsUpdate from 'react-addons-update'
import autobind from 'autobind-decorator'
import { connect } from 'react-redux'

@autobind
class ElementGroup extends React.Component {
  cloneElement(element) {
    const elements = ReactAddonsUpdate(this.state.elements, { $push: [element] })
    this.setState({elements: elements})
  }

  deleteElement(element) {
    const index = this.state.elements.indexOf(element)
    const elements = ReactAddonsUpdate(this.state.elements, { $splice: [[index, 1]] })
    this.setState({elements: elements})
  }

  // 返回element的index为-1, 删除最后一个元素
  deleteLastElement() {
    const elements = ReactAddonsUpdate(this.state.elements, { $splice: [[-1, 1]] })
    this.setState({elements: elements})
  }

  sidebar() {
    return document.getElementById('sidebar')
  }

  render() {
    const { elements } = this.props
    return (
      <div>
        {
          elements.map(function(element) {
            return (
              <Element meta_element={ element } key={ "key_" + element.id } id={ element.id } name={ element.name } initialPos={ element.initialPos } target_type={ element.target_type } handleCloneElement={ this.cloneElement } handleDeleteElement={ this.deleteElement } handleDeleteLastElement={ this.deleteLastElement } />
            )
          }.bind(this))
        }
      </div>
    )
  }
}

const mapStateToProps = (state, ownProps) => ({
  elements: state.headergroup
})

const mapDispatchToProps = (dispatch, ownProps) => ({
})

const VisibleElementGroup = connect(
  mapStateToProps,
  mapDispatchToProps
)(ElementGroup)

export default VisibleElementGroup