reactjs - React Redux 表单初始化

Question

enter image description here enter image description here我正在开发一个博客页面，您可以单击一个按钮并打开一个模式来编辑帖子下的评论。

在帖子详细信息页面上，我有:

openEditCommentModal = (id) => {
    this.setState(() => ({
    editCommentModalOpen: true,
}))
    this.props.fetchCommentById(id)
}

在编辑评论文件中我有:

const mapStateToProps = state => {
    return {
        initialValues: state.commentContainer.selectedComment
    }
}

所以我做了两件事: 1.打开模态 2. 调用 fetchCommentById(id) 以便我可以更新 state.commentContainer.selectedComment

帖子详情页为父组件，编辑评论表单为子组件。

我需要为编辑表单提供初始值。初始值是评论的原始内容，然后用户可以对其进行编辑。

奇怪的是，当我第一次单击编辑按钮时，没有初始值。这是一个空物体。因此我有一个空表格。 当我关闭模式并重新打开它时，initialValue 将被更新为我想要的评论，并且编辑评论表单现在包含所有原始内容。

我不明白为什么 openEditCommentModal 无法第一次更新状态。有人可以帮忙吗？

==============

问题已解决: 在 reduxForm 中，执行以下操作:

启用重新初始化:true

在帖子详细信息页面上:

openEditCommentModal = (id) => {
        this.setState(() => ({
        editCommentModalOpen: true,
    }))
        this.props.fetchCommentById(id)
    }

......

<Modal
          className='modal'
          overlayClassName='overlay'
          isOpen={editCommentModalOpen}
          onRequestClose={this.closeEditCommentModal}
          contentLabel='Modal'
        >
         <div>
           <EditComment />
           <button onClick={() => this.closeEditCommentModal()}>Close</button>
           </div>
        </Modal>

............

const mapDispatchToProps = dispatch => {
    return {
        fetchByPostId: id => dispatch(fetchByPostId(id)),
        deleteByPostId: id => dispatch(deleteByPostId(id)),
        deleteByCommentId: id => dispatch(deleteByCommentId(id)),
        vote: (id, option) => dispatch(vote(id, option)),
        fetchComments: id => dispatch(fetchComments(id)),
        fetchCommentById: id => dispatch(fetchCommentById(id))
    };
 };

编辑评论组件:

import React, { Component } from "react";
import { Field, reduxForm } from 'redux-form'
import { Link } from 'react-router-dom'
import { connect } from 'react-redux'
import { fetchCommentById } from '../Actions'
// import { updateComment } from '../Actions'
const randomID = require("random-id")

class EditComment extends Component {


  renderField = (field) => {
    const { meta: { touched, error } }  = field
    const className = `form-group ${ touched && error ? 'has-danger' : '' }`

    return (
      <div className={className}>
        <label>{field.label}</label>
        <input 
          className="form-control"
          type="text"
          {...field.input}
        />
        <div className="text-help">
          {touched ? error : ''}
        </div>
      </div>
    )
  }

  onSubmit = (values) => {
    const id = values.id
    let newValues = {}
    newValues.body = values.body
  //  this.props.updatePost(newValues, id, this.props.history.push(`/post/${id}`) )
  }

  render() {

    console.log('this.props.initialValue', this.props.initialValues)

    if(!this.props.initialValues) {
      return <div></div>
    } 




    const { handleSubmit, categories, id } = this.props

    return (
      <div>
        <h1>Edit Comment</h1>
        <form onSubmit={handleSubmit(this.onSubmit)}>
          <Field
            label="Content"
            name="body"
            component={this.renderField}
          />
          <span>Author: </span><span>{this.props.initialValues.author}  </span>
          <span>Time: </span><span>{this.props.initialValues.timestamp}</span>
          <div>
          <button type="submit">Submit</button> 

          </div>
        </form>
      </div> 
    )
  }
}
const validate = (values) => {
  const errors = {}

  if(!values.title) {
    errors.title = "Enter a title"
  }
  if(!values.category) {
    errors.category = "Enter a category"
  }
  if(!values.content) {
    errors.content = "Enter some content"
  }
  return errors
}

const mapStateToProps = state => {
  return {
    initialValues: state.commentContainer.selectedComment
  }
}


EditComment = reduxForm({
  validate,
  form: 'CommentEditForm',
  enableReinitialize : true
})(EditComment)


export default connect(mapStateToProps, { fetchCommentById })(EditComment)

Answer 1

我检查了你的代码并搜索了你的问题，我发现了这个answer您必须启用表单的初始化才能与您的数据绑定(bind)，所以您需要做什么:

EditComment = reduxForm({
  validate,
  form: 'CommentEditForm',
  enableReinitialize : true // you need to add this property
})(EditComment)