[英]issues updating this.state.data object in state React
I have the following App.js file where I try to change 7 state attributes into one easier to manage data object.我有以下 App.js 文件,我尝试将 7 个 state 属性更改为更易于管理数据 object 的属性。 I am following Updating an object with setState in React trying to use the main answer but I have now tried 3 different ways to update state, including the accepted answer, and nothing is working.我正在关注在 React 中使用 setState 更新 object尝试使用主要答案,但我现在尝试了 3 种不同的方法来更新 state,包括接受的答案,但没有任何效果。 I have here App.js:我这里有 App.js:
import React from 'react';
import SearchBar from './SearchBar';
import AllDividendsDisplay from './dividend_results_display/AllDividendsDisplay';
import DividendResultsDisplay from './dividend_results_display/DividendResultsDisplay';
import axios from 'axios';
class App extends React.Component {
state = {
loading: false,
current_price: '',
recent_dividend_rate: '',
current_yield: '',
dividend_change_1_year: '',
dividend_change_3_year: '',
dividend_change_5_year: '',
dividend_change_10_year: '',
all_dividends: [],
}
runStockInfoSearch = async (term) => {
// clear old data
this.setState({
loading: true,
current_price: '',
recent_dividend_rate: '',
current_yield: '',
dividend_change_1_year: '',
dividend_change_3_year: '',
dividend_change_5_year: '',
dividend_change_10_year: '',
all_dividends: [],
});
// const host = '67.205.161.47';
const HOST = 'localhost';
const base_url = 'http://' + HOST + ':8000'
const dividends_api_url = base_url + '/dividends/' + term
axios.get(dividends_api_url, {})
.then(response => {
console.log(response.data)
const RESPONSE_KEYS = [
'current_price',
'current_yield',
'recent_dividend_rate'
]
RESPONSE_KEYS.map((key) => {
this.setState({[key]: response.data[key]})
})
this.setState({all_dividends: response.data['all_dividends'].reverse()})
const YEARS_CHANGE = [1, 3, 5, 10];
YEARS_CHANGE.map((year) => {
const key = 'dividend_change_' + year.toString() + '_year';
this.setState({[key]: response.data[key]})
});
this.setState({loading: false})
})
.catch(err => {
console.log(err);
})
}
render() {
if (this.state.loading === true) {
return (
<div className="ui container" style={{marginTop: '10px'}}>
<SearchBar runSearch={this.runStockInfoSearch} />
<div className="ui segment">
<div className="ui active dimmer">
<div className="ui text loader">Loading</div>
</div>
</div>
</div>
)
} else {
return (
<div className="ui container" style={{marginTop: '10px'}}>
<SearchBar runSearch={this.runStockInfoSearch} />
<DividendResultsDisplay
current_price={this.state.current_price}
recent_dividend_rate={this.state.recent_dividend_rate}
current_yield={this.state.current_yield}
dividend_change_1_year={this.state.dividend_change_1_year}
dividend_change_3_year={this.state.dividend_change_3_year}
dividend_change_5_year={this.state.dividend_change_5_year}
dividend_change_10_year={this.state.dividend_change_10_year}
all_dividends={this.state.all_dividends}
/>
</div>
)
}
}
}
export default App;
The project can be downloaded at https://github.com/codyc4321/dividends_ui该项目可以在https://github.com/codyc4321/dividends_ui下载
I am getting the response data still but cannot update this state to put any data on the screen:我仍然收到响应数据,但无法更新此 state 以将任何数据放在屏幕上:
Any help appreciated, thank you任何帮助表示赞赏,谢谢
This is the best solution, the simplest way to update a state object:这是最好的解决方案,更新 state object 的最简单方法:
import React from 'react';
import SearchBar from './SearchBar';
import AllDividendsDisplay from './dividend_results_display/AllDividendsDisplay';
import DividendResultsDisplay from './dividend_results_display/DividendResultsDisplay';
import axios from 'axios';
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
loading: false,
dividends_data: {
current_price: '',
recent_dividend_rate: '',
current_yield: '',
dividend_change_1_year: '',
dividend_change_3_year: '',
dividend_change_5_year: '',
dividend_change_10_year: '',
all_dividends: [],
}
}
}
updateStateData = (key, value) => {
const data = this.state.dividends_data;
data[key] = value;
this.setState({data});
}
runStockInfoSearch = async (term) => {
console.log("running search")
// clear old data
this.setState({
loading: true,
current_price: '',
recent_dividend_rate: '',
current_yield: '',
dividend_change_1_year: '',
dividend_change_3_year: '',
dividend_change_5_year: '',
dividend_change_10_year: '',
all_dividends: [],
});
const HOST = 'localhost';
const base_url = 'http://' + HOST + ':8000'
const dividends_api_url = base_url + '/dividends/' + term
axios.get(dividends_api_url, {})
.then(response => {
console.log(response.data)
const RESPONSE_KEYS = [
'current_price',
'current_yield',
'recent_dividend_rate'
]
RESPONSE_KEYS.map((key) => {
this.updateStateData(key, response.data[key]);
})
this.updateStateData('all_dividends', response.data['all_dividends'].reverse());
const YEARS_CHANGE = [1, 3, 5, 10];
YEARS_CHANGE.map((year) => {
const key = 'dividend_change_' + year.toString() + '_year';
this.updateStateData(key, response.data[key]);
});
this.setState({loading: false})
})
.catch(err => {
console.log(err);
})
}
render() {
if (this.state.loading === true) {
return (
<div className="ui container" style={{marginTop: '10px'}}>
<SearchBar runSearch={this.runStockInfoSearch} />
<div className="ui segment">
<div className="ui active dimmer">
<div className="ui text loader">Loading</div>
</div>
</div>
</div>
)
} else {
return (
<div className="ui container" style={{marginTop: '10px'}}>
<SearchBar runSearch={this.runStockInfoSearch} />
<DividendResultsDisplay
data={this.state.dividends_data}
/>
</div>
)
}
}
}
export default App;
You need to call the constructor function to add a state.您需要调用构造函数 function 来添加 state。 For that, change this piece of code:为此,更改这段代码:
state = {
loading: false,
dividends_data: {
current_price: '',
recent_dividend_rate: '',
current_yield: '',
dividend_change_1_year: '',
dividend_change_3_year: '',
dividend_change_5_year: '',
dividend_change_10_year: '',
all_dividends: [],
}
}
with this one:有了这个:
constructor(props) {
super(props);
this.state = {
loading: false,
dividends_data: {
current_price: '',
recent_dividend_rate: '',
current_yield: '',
dividend_change_1_year: '',
dividend_change_3_year: '',
dividend_change_5_year: '',
dividend_change_10_year: '',
all_dividends: [],
}
};
}
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