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[英]Is there a way of passing props from child to parent without onClick
[英]Passing props from child to parent(without context)
我有一点点问题,包括把头脑传递给父母。 我需要将数据从表单容器发送到应用程序,以便我可以在提交后显示天气信息中列表的更新状态
class App extends Component {
render() {
return (
<div className="App">
<div className="App-header">
<img src={logo} className="App-logo" alt="logo" />
<h2>Weather App</h2>
</div>
<p className="App-intro">
To get started, edit <code>src/App.js</code> and save to reload.
</p>
<FormContainer label="Name of the city:"/>
<WeatherInfo
nameOfCity={this.state.nameOfCity}
weatherDescription={this.state.weatherDescription}
windSpeed={this.state.windSpeed}
temperature={this.state.temperature}
maxTemperature={this.state.maxTemperature}
minTemperature={this.state.minTemperature}
/>
</div>
);
}
}
export default App;
表格容器
class FormContainer extends Component {
constructor(props) {
super(props);
this.state = {
cityName: '',
nameOfCity:'',
weatherDescription:'',
windSpeed:'',
temperature:'',
maxTemperature:'',
minTemperature:''
};
this.handleFormSubmit = this.handleFormSubmit.bind(this);
this.handleCityName = this.handleCityName.bind(this);
}
handleFormSubmit(e) {
e.preventDefault();
const SendForm = {
cityName: this.state.cityName
};
console.log(SendForm);
fetch(`http://api.openweathermap.org/data/2.5/forecast/weather?q=${SendForm.cityName}&units=metric&APPID=********`)
.then(res => res.json())
.then(results => {
this.setState({
nameOfCity: results.city.name,
weatherDescription: results.list[0].weather[0].description,
windSpeed: results.list[2].wind.speed,
temperature: results.list[0].main.temp,
maxTemperature: results.list[0].main.temp_max,
minTemperature: results.list[0].main.temp_min
});
});
}
handleCityName(value) {
this.setState({ cityName: value });
}
render() {
return (
<div>
<form onSubmit={this.handleFormSubmit}>
<label>{this.props.label}</label>
<SearchBar
name="CityName"
type="text"
value={this.state.cityName}
placeholder="search"
onChange={this.handleCityName}
/>
<button type="submit"
className=""
value='Submit'
placeholder="Search" />
</form>
</div>
);
}
}
export {FormContainer};
搜索栏组件
const SearchBar = (props) => (
<div>
<label>{props.label}</label>
<input name={props.name} type={props.inputType} value={props.value} placeholder={props.placeholder} onChange={(e)=>props.onChange(e.target.value)}/>
</div>
);
export default SearchBar;
和天气信息组件
const WeatherInfo = (props) => (
<div>
<ul>
<li>{props.nameOfCity}</li>
<li>{props.weatherDescription}</li>
<li>{props.windSpeed}</li>
<li>{props.temperature}</li>
<li>{props.maxTemperature}</li>
<li>{props.minTemperature}</li>
</ul>
</div>
);
export default WeatherInfo;
您可以传递方法将App
状态更新为FormContainer
组件
class App extends Component {
constructor() {
this.state = {
cityName: '',
nameOfCity:'',
weatherDescription:'',
windSpeed:'',
temperature:'',
maxTemperature:'',
minTemperature:''
};
}
updateInfo(results) {
this.setState({
nameOfCity: results.city.name,
weatherDescription: results.list[0].weather[0].description,
windSpeed: results.list[2].wind.speed,
temperature: results.list[0].main.temp,
maxTemperature: results.list[0].main.temp_max,
minTemperature: results.list[0].main.temp_min
});
}
render() {
return (
<div className="App">
<div className="App-header">
<img src={logo} className="App-logo" alt="logo" />
<h2>Weather App</h2>
</div>
<p className="App-intro">
To get started, edit <code>src/App.js</code> and save to reload.
</p>
<FormContainer label="Name of the city:" updateInfo={this.updateInfo.bind(this)}
nameOfCity={this.state.nameOfCity}
/>
<WeatherInfo
nameOfCity={this.state.nameOfCity}
weatherDescription={this.state.weatherDescription}
windSpeed={this.state.windSpeed}
temperature={this.state.temperature}
maxTemperature={this.state.maxTemperature}
minTemperature={this.state.minTemperature}
/>
</div>
);
}
}
export default App;
并从FormComponent
调用它
class FormContainer extends Component {
constructor(props) {
super(props);
this.handleFormSubmit = this.handleFormSubmit.bind(this);
this.handleCityName = this.handleCityName.bind(this);
}
handleFormSubmit(e) {
e.preventDefault();
const SendForm = {
cityName: this.props.cityName
};
console.log(SendForm);
fetch(`http://api.openweathermap.org/data/2.5/forecast/weather?q=${SendForm.cityName}&units=metric&APPID=********`)
.then(res => res.json())
.then(results => {
this.props.updateInfo(results);
});
}
handleCityName(value) {
// Do what you want to do, like resend API request or smth
}
render() {
return (
<div>
<form onSubmit={this.handleFormSubmit}>
<label>{this.props.label}</label>
<SearchBar
name="CityName"
type="text"
value={this.props.cityName}
placeholder="search"
onChange={this.handleCityName}
/>
<button type="submit"
className=""
value='Submit'
placeholder="Search" />
</form>
</div>
);
}
}
export {FormContainer};
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