我有一个如下所示的网格组件:
import React, { Component } from 'react';
import Action from './action.jsx';
class Grid extends Component {
constructor(props) {
super(props);
this.maxN = 110;
this.tempArray = [];
this.question;
}
getRandomN() {
var randomN = Math.floor((Math.random() * this.maxN) + 1);
if(this.tempArray.indexOf(randomN) === -1) {
this.tempArray.push(randomN);
}
else {
randomN = this.getRandomN();
}
return randomN;
}
getRandomQuestion() {
this.question = this.props.current.data.questions[this.getRandomN()];
return this.question;
}
render() {
this.getRandomQuestion();
return (
<section className="game">
<div className="grid">
<div className="row">
<div ref="n1"></div>
<div ref="n2"></div>
<div ref="n3"></div>
<div ref="n4"></div>
<div ref="n5"></div>
<div ref="n6"></div>
</div>
<div className="row">
<div ref="n7"></div>
<div ref="n8"></div>
<div ref="n9"></div>
<div ref="n10"></div>
<div ref="n11"></div>
<div ref="n12"></div>
</div>
<div className="row">
<div ref="n13"></div>
<div ref="n14"></div>
<div ref="n15"></div>
<div ref="n16"></div>
<div ref="n17"></div>
<div ref="n18"></div>
</div>
<div className="row">
<div ref="n19"></div>
<div ref="n20"></div>
<div ref="n21"></div>
<div ref="n22"></div>
<div ref="n23"></div>
<div ref="n24"></div>
</div>
</div>
<Action question={this.question} getRandomQuestion={this.getRandomQuestion.bind(this)}/>
</section>
);
}
}
export default Grid;
在“操作”组件内,根据来自“getNewQuestion”的正确或错误答案,我需要访问网格组件中的一个随机网格元素。(任意随机从“n1”到“n24”,分配给每个ref属性)
import React, { Component } from 'react';
class Action extends Component {
constructor(props) {
super(props);
this.state = {
question: props.question
}
}
getNewQuestion(e) {
console.log(this.state.question.correct_option);
let answerId = "option_" + this.state.question.correct_option;
if(e.target.getAttribute('data-question') == answerId) {
this.setState({
question: this.props.getRandomQuestion()
});
}
else {
console.log('wrong');
React.findDOMNode(this.refs.n1).classList.add('fdsdfsdfsdfsdfsfsdf');
}
}
render() {
let state = this.state;
return(
<div className="action">
<div className="action-question">
<h3>{state.question.question}</h3>
</div>
<div className="action-answers">
<p data-question="option_1" onClick={this.getNewQuestion.bind(this)}>{state.question.option_1}</p>
<p data-question="option_2" onClick={this.getNewQuestion.bind(this)}>{state.question.option_2}</p>
<p data-question="option_3" onClick={this.getNewQuestion.bind(this)}>{state.question.option_3}</p>
<p data-question="option_4" onClick={this.getNewQuestion.bind(this)}>{state.question.option_4}</p>
</div>
</div>
);
}
}
export default Action;
在"getNewQuestion"的"if"语句内,我想做如下操作:
n2.classList.addClass('hidden');
我无法从"Action"组件中访问父节点的DOM节点。
<div className={this.state.someVariable} />
。然后你可以在modifyMyOwnStyle
函数中修改该状态(例如this.setState({ someVariable: 'hidden' })
)。当状态更新时,这将导致重新渲染。然后{ this.state.someVariable }
将解析为新值,从而更改赋予div的className。注意,在我的示例中,我使用了功能组件,它们没有状态。因此,您需要将它们转换为有状态的组件。 - jonahe