我希望在单击按钮X时,其值X传递给结果函数(与O相同),我可以将其存储在变量中。我不知道如何在调用结果时传递此值并在那里访问它。我试图找到很多答案,但都没有效果。 我反应很新。请帮忙!!谢谢!! 这是代码段
import React, { Component } from 'react';
import './App.css';
import { Link } from 'react-router-dom';
class App extends Component {
render() {
return (
<div>
<h1 align="center">Welcome to TicTacToe</h1>
<br></br><br></br><br></br><br></br>
<div class="front">
Choose your sign !!
<CheckBox type='submit' value='X' id='x' onSubmit={'how to pass value'}/>
<CheckBox type='submit' value='O' id='o' onSubmit={'how to pass value'}/>
</div>
<br></br>
<Link to= "game"><p class="wrap"><button class="button">GO</button></p></Link>
{this.props.children}
</div>
);
}
}
class CheckBox extends Component{
result(i){
//what to access value
}
render(){
return (
<div className={'check-field'}>
<button type={this.props.type} value={this.props.value} name={this.props.name} id={this.props.id}>{this.props.value}</button>
</div>
);
}
}
export default App;
答案 0 :(得分:2)
我不确定我是否正确理解你的问题,但是要从父输入组件中获取一个子输入组件(输入/按钮/ textarea)的值,只需传递一个带有将在子组件中调用的函数的prop。在任何onClick
/ onChange
回调函数上。这是一个小例子:
class App extends React.Component {
onSubmit(value) {
// I have the button value here!
console.log(value);
}
render() {
return (
<div>
<Button value="X" onSubmit={this.onSubmit} />
<Button value="O" onSubmit={this.onSubmit} />
</div>
)
}
}
class Button extends React.Component {
onClick(event) {
const value = event.target.value;
this.props.onSubmit(value);
}
render() {
return (
<button value={this.props.value} onClick={e => this.onClick(e)}>
{this.props.value}
</button>
);
}
}
ReactDOM.render(
<App />,
document.getElementById('app')
);
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="app" />
我希望这能解决你的问题!
答案 1 :(得分:0)
您可以在App的状态下存储每个复选框值。然后,当checkbox为subimtted值时,它将调用handleSubmit,而事件参数e将保存checkbox和id的复选框。在您的情况下,您可以相应地检查它的X或Y和setState。这将重新呈现将通过道具获得正确值的复选框。
import React, { Component } from 'react';
import './App.css';
import { Link } from 'react-router-dom';
class App extends Component {
state = {
X : false,
Y : false
}
handleSubmit = (e) => {
if(e.target.id === 'x') {
this.setState({X:true});
} else {
this.setState({Y:true});
}
}
render() {
const { X,Y } = this.state;
return (
<div>
<h1 align="center">Welcome to TicTacToe</h1>
<br></br><br></br><br></br><br></br>
<div class="front">
Choose your sign !!
<CheckBox type='submit' value={X} id='x' onSubmit={this.handleSubmit}/>
<CheckBox type='submit' value={Y} id='o' onSubmit={this.handleSubmit}/>
</div>
<br></br>
<Link to= "game"><p class="wrap"><button class="button">GO</button></p></Link>
{this.props.children}
</div>
);
}
}
class CheckBox extends Component{
render(){
const {value, type, name, id} = this.props;
return (
<div className={'check-field'}>
<button type={type} value={value} name={name} id={id}>{value}</button>
</div>
);
}
}
export default App;