Question

仅学习redux形式，并且从组件内部尝试通过代码更改字段名：

Import React from 'react'
import { connect, dispatch } from 'react-redux'
import { Field, reduxForm, formValueSelector } from 'redux-form'



let SelectingFormValuesForm = props => {

  const changeStuff = (props) => {
    dispatch(change('selectingFormValues', 'firstName', 'Bertje'))
  }

  const {
    favoriteColorValue,
    fullName,
    handleSubmit,
    hasEmailValue,
    pristine,
    reset,
    submitting,
    change
  } = props
  return (
    <form onSubmit={handleSubmit}>
      <div>
        <label>First Name</label>
        <div>
          <Field
            name="firstName"
            component="input"
            type="text"
            placeholder="First Name"
          />
        </div>
      </div>
      <div>
        <label>Last Name</label>
        <div>
          <Field
            name="lastName"
            component="input"
            type="text"
            placeholder="Last Name"
          />
        </div>
      </div>
      <div>
        <label htmlFor="hasEmail">Has Email?</label>
        <div>
          <Field
            name="hasEmail"
            id="hasEmail"
            component="input"
            type="checkbox"
          />
        </div>
      </div>
      {hasEmailValue && (
        <div>
          <label>Email</label>
          <div>
            <Field
              name="email"
              component="input"
              type="email"
              placeholder="Email"
            />
          </div>
        </div>
      )}
      <div>
        <label>Favorite Color</label>
        <div>
          <Field name="favoriteColor" component="select">
            <option />
            <option value="#ff0000">Red</option>
            <option value="#00ff00">Green</option>
            <option value="#0000ff">Blue</option>
          </Field>
        </div>
      </div>
      {favoriteColorValue && (
        <div
          style={{
            height: 80,
            width: 200,
            margin: '10px auto',
            backgroundColor: favoriteColorValue
          }}
        />
      )}
      <div>
        <button type="submit" disabled={pristine || submitting}>
          Submit {fullName}
        </button>
        <button type="button" disabled={pristine || submitting} onClick={reset}>
          Clear Values
        </button>
        <button type="button" onClick={changeStuff}>
          Change first name
        </button>
      </div>
    </form>
  )
}

// The order of the decoration does not matter.

// Decorate with redux-form
SelectingFormValuesForm = reduxForm({
  form: 'selectingFormValues',// a unique identifier for this form
  change: reduxForm.change,
  dispatch:reduxForm.dispatch
})(SelectingFormValuesForm)

// Decorate with connect to read form values
const selector = formValueSelector('selectingFormValues') // <-- same as form name
SelectingFormValuesForm = connect(state => {

  //debugger
  // can select values individually
  const hasEmailValue = selector(state, 'hasEmail')
  const favoriteColorValue = selector(state, 'favoriteColor')
  // or together as a group
  const { firstName, lastName } = selector(state, 'firstName', 'lastName')
  return {
    hasEmailValue,
    favoriteColorValue,
    fullName: `${firstName || ''} ${lastName || ''}`
  }
})(SelectingFormValuesForm)

export default SelectingFormValuesForm

当我单击此“更改名字”按钮时，将执行该操作。我从redux-form导入了change操作。为什么会出现此错误：

react-dom.development.js：283 Uncaught TypeError：（0， _reactRedux.dispatch）不是函数在changeStuff处（SelectingFormValuesForm.js：20）在HTMLUnknownElement.callCallback（react-dom.development.js：143）在Object.invokeGuardedCallbackDev（react-dom.development.js：193）

Answer 1

更改字段值的几种方法，但是使用change的方法如下：

import { connect, change } from 'redux-form';
将change添加到mapDispatchToProps对象。
在mapDispatchToProps中添加connect作为第二个参数（如果不需要mapStateToProps，则将其为connect(null, mapDispatchToProps)。
用this.props.change，props.change和formname呼叫fieldname或value。
可选-调用辅助表单操作时使用PureComponent-易于阅读和测试。

工作示例：https://codesandbox.io/s/r5zz36lqnn

如何以Redux形式调度更改操作？

1 个答案: