Javascript Textfield不会对Reducer作出反应，尽管console.log显示正确的值

我想写一个工具，它可以遍历一个学校班级的学生。 因此，我在react组件中有一个文本字段，它显示一个值：

<input className="form-control" onChange={this.handleInputChange} value={this.props.activePupil.name}></input>

…并且每当用户编辑文本字段时，都将使用handleInputChange方法处理，如下所示：

  this.setState({
      inputField: evt.target.value
  });

这一切都很好，但现在，当我想遍历学校类时，我的reducer（包含当前或活动的学生）是正确的（console.log显示正确的值），但输入字段中显示的值总是落后一个

为什么会这样

编辑：完整代码：

// Import React
import React from 'react';

class PupilViewer extends React.Component{

  constructor(props) {
   super(props);
   this.state = {
     inputField: "No Pupil selected yet."
   };
    this.handleInputChange = this.handleInputChange.bind(this);
    this.onSubmit = this.onSubmit.bind(this);
 }
  handleInputChange(evt) {
      this.setState({
          inputField: evt.target.value
      });    

  }
  onSubmit(e) {
      e.preventDefault();
      this.props.nextPupil();

      this.state.inputField = this.props.activePupil.name;
  }

  render() {
    // Return JSX via render()
    return (
      <div className="">
        <h1>Pupil View</h1>
        <input className="form-control" onChange={this.handleInputChange} value={this.state.inputField}></input>
        <button className="btn btn-large btn-positive" onClick={this.onSubmit}>Next</button>
      </div>
    );
  }

}


// Export Search
export default PupilViewer

我与所有学生的对话：

//my default array
let default_pupils = [{
id: 0,
name: "Matthew",
//there are more attributes here
},  
{
 //and there are more pupils here
}];

export default function (state=default_pupils, action) {
  switch (action.type) {
      case "SAVE_CHANGES":
        let newState = [...state];
        newState[2] = {...newState[2], name: action.payload.name };
        return newState;
      default:
        return state;
    }
}

最后，我的行动如下：

var activePupilCount = 0;

export const getActivePupil = () => {
  return {
    type: "GET_ACTIVE"
  };
}

export const updateActivePupil = (pupil) => {
  console.log("UPDATE:" + pupil.name)
  return {
    type: "UPDATE_ACTIVE",
    payload: pupil
  };
}

export const nextActivePupil = () => {
  return (dispatch, getState) => {
    const {activePupil, pupilList} = getState();
    activePupilCount++;
    console.log("COUNT:"+ activePupilCount);
    const nextIndex = (activePupilCount) % pupilList.length;
    const nextActive = pupilList[nextIndex];

    dispatch({ type: "UPDATE_ACTIVE", payload: nextActive });
  }
};

export const saveChanges = (pupil) => {
  return {
    type: "SAVE_CHANGES",
    payload: pupil
  }
};

---

不确定这是否会修复所有问题并使其按预期工作，但您永远不应该这样做

this.state.inputField = this.props.activePupil.name;

相反，你应该这样做

this.setState({ inputField: this.props.activePupil.name })

---

请发布相关的redux代码。从你的问题来看，仅仅从描述来看，问题是否完全可以理解还不清楚。你看到任何缺陷了吗？

var activePupilCount = 0;

export const getActivePupil = () => {
  return {
    type: "GET_ACTIVE"
  };
}

export const updateActivePupil = (pupil) => {
  console.log("UPDATE:" + pupil.name)
  return {
    type: "UPDATE_ACTIVE",
    payload: pupil
  };
}

export const nextActivePupil = () => {
  return (dispatch, getState) => {
    const {activePupil, pupilList} = getState();
    activePupilCount++;
    console.log("COUNT:"+ activePupilCount);
    const nextIndex = (activePupilCount) % pupilList.length;
    const nextActive = pupilList[nextIndex];

    dispatch({ type: "UPDATE_ACTIVE", payload: nextActive });
  }
};

export const saveChanges = (pupil) => {
  return {
    type: "SAVE_CHANGES",
    payload: pupil
  }
};

this.state.inputField = this.props.activePupil.name;

this.setState({ inputField: this.props.activePupil.name })