为什么单击按钮后我的数据文件无法更改？

Question

I have a app that read all information from my data.json file. I import the file and pass by props to the components.

I'm trying to change the language, changing my data.json import path.

Now I have a import data from './data/data.json' , but I want to have two language. Then, I translated the data.json and create another two data files ./data/data-en.json and ./data/data-pt.json .

And made a button to change between pt and en .

When I click on the button, nothing works.

import React, { Component } from 'react';
import MyComponent from './MyComponent';
import AnotherComponent from './AnotherComponent';

import data from './data/data.json';
import english from './data/data-en.json';
import portuguese from './data/data-pt.json';

class MyApp extends Component {

  constructor(props) {
    super(props);
    this.state = { isToggleOn: true };
    this.state = { data: english };
    this.handleClick = this.handleClick.bind(this);
  }

  handleClick() {
    this.setState(state => ({
      isToggleOn: !state.isToggleOn
    }));
    if (this.state.isToggleOn) {
      this.setState(state => ({
        data: english
      }))
    } else {
      this.setState(state => ({
        data: portuguese
      }))
    }
    console.log(data)
  }

  render() {
    return (
      <div>
        <button onClick={this.handleClick}>
          {this.state.isToggleOn ? 'en' : 'pt'}
        </button>
        <MyComponent data={data.mycomponent} />
        <AnotherComponent data={data.anothercomponent} />
      </div>
    );
  }
}

export default MyApp;

How can I change my data?

Thanks

Answer 1

The setState is not synchronous, so in your handleClick you should use a callback to have the new state and do your things:

handleClick() {
  this.setState(state => ({
    isToggleOn: !state.isToggleOn,
    data: state.isToggleOn ? portuguese : english,
  }));
  console.log(data);
}

Also no need to initialize state twice in constructor so

Change

this.state = { isToggleOn: true };
this.state = { data: english };

To

this.state = {
  isToggleOn: true,
  data: english
}

Here more information about setState : https://reactjs.org/docs/state-and-lifecycle.html

Answer 2

I fixed my problem just puting this.state. in my components:

<MyComponent data={this.state.data.mycomponent} />
<AnotherComponent data={this.state.data.anothercomponent} />

Anyway, thanks very much.