reactjs - [material-ui],[redux-from] 使用动态选项选择

Question

我从后端请求数据。数据是礼物数据和人物数据。

我的目标是实现礼物与人的联系。每个人都会收到一份礼物。

我使用material-ui和 redux-form包。

人员数据树如下:

persons: "
        [ {
            name:'person1_name',
            userID:'person1_userID',
            hobbies: persondata -> the same to persons  
           },
           {
            name:'person2_name',
            userID:'person2_userID',
            hobbies: persondata -> the same to persons  
           }, 
           {
            name:'person3_name',
            userID:'person3_userID',
            hobbies: persondata -> the same to persons  
           }
          ]

我想得到这样的结果: 我点击select , 3(如果后台人员数据为3人)人item显示(选项)。

我使用 redux 状态 state.sendGood.driftMemberArray.formData保存人员数据。

我的代码如下:

import React from 'react'
import {Field, FieldArray, reduxForm } from 'redux-form'
import { connect }   from 'react-redux'
import SelectField from 'material-ui/SelectField'
import MenuItem from 'material-ui/MenuItem'

const renderSelectField = ({ input, label, meta: { touched, error }, children, ...custom }) => (
    <SelectField
        floatingLabelText={label}
        errorText={touched && error}
        {...input}
        onChange={(event, index, value) => input.onChange(value)}
        children={children}
        {...custom}/>
)

const renderMembers = ({ fields, meta: { touched, error, submitFailed } }) => (
    <ul>
      {fields.map((member, index) =>
          <li key={index}>
            <Field name={`${member}.selectMan`} component={renderSelectField} label="select a man">
              {member.hobbies.map( (item,keyIndex) =>
                 <MenuItem  key={keyIndex} value={keyIndex} primaryText='hahah'/>
              )}
            </Field>
          </li>
      )}
    </ul>
)


let NextWeekDriftForm = (props) => {
  const { handleSubmit, pristine, reset, submitting} = props;
  return (
      <form onSubmit={handleSubmit}>
        <div>
          <FieldArray name="members"component={renderMembers}/>
        </div>
      </form>
  )
}

NextWeekDriftForm =  reduxForm({
  form: 'NextWeekDriftForm',     // a unique identifier for this form
  enableReinitialize: true,
})(NextWeekDriftForm)

export default NextWeekDriftForm =  connect(
    state => ({
      initialValues:state.sendGood.driftMemberArray.formData,
    })
) (NextWeekDriftForm)

结果，错误显示:

Uncaught (in promise) TypeError: Cannot read property 'map' of undefined

{member.hobbies.map( (item,keyIndex) =>
<MenuItem key={keyIndex} value={keyIndex} primaryText='hahah'/>

我的问题可能出在这段代码中。

我用的是

  <MenuItem  value='09090' primaryText='hahah'/>
  <MenuItem  value='09090' primaryText='hahah'/>
  <MenuItem  value='09090' primaryText='hahah'/>

替换代码

 {member.hobbies.map( (item,keyIndex) =>
                     <MenuItem  key={keyIndex} value={keyIndex} primaryText='hahah'/>

浏览器渲染良好。

我想实现select的动态选项。

不管怎样，能实现我的目标就OK了。如果你看完我的描述后还不明白这个问题。我会再次编辑这个问题。

Answer 1

当应用程序加载时，member.hobbies 可能尚未定义。如果未定义，请尝试声明一个变量以将此数组设置为 null:

const hobbies = member.hobbies || []

然后:

{hobbies.map( (item,keyIndex) =>
                 <MenuItem  key={keyIndex} value={keyIndex} primaryText='hahah'/>