Question

我正在获取引号API。在这里，我想随机更新报价，但是在单击按钮时我想更新报价。我不知道该怎么做。有人可以帮我吗？

我已经使用获取请求获取了数据，然后将数据添加到状态中。

这是我的代码

import React from "react";    
import "./styles.css";    
class Box extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      quote: "",
      author: ""
    };
  }    
  componentDidMount() {
    this.fetchData();
  }
  fetchData = () => {
    fetch(
      "https://gist.githubusercontent.com/camperbot/5a022b72e96c4c9585c32bf6a75f62d9/raw/e3c6895ce42069f0ee7e991229064f167fe8ccdc/quotes.json"
    )
      .then(result => {
        return result.json();
      })
      .then(data => {
        const ran = Math.floor(Math.random() * data.quotes.length);       
        console.log(data.quotes[ran].quote);
        console.log(data.quotes[ran].author);
        this.setState({
          quote: data.quotes[ran].quote,
          author: data.quotes[ran].author
        });
      });
  };

  render() {
    return (
      <div id="quote-box" className="container">
        <div className="box-container">
          <div className="text-center">
            <h1 id="text">{this.state.quote}</h1>
          </div>
          <div className="float-right">
            <p id="author">
              <span>- </span>
              {this.state.author}
            </p>
          </div>
        </div>
        <div className="box-item">
          <div className="row">
            <div className="col-sm-6">Twitter</div>
            <div className="col-sm-6">
              <button>next quote</button>  <--- Here i want this button to update quotes on screen.
            </div>
          </div>
        </div>
      </div>
    );
  }
}

export default Box;

Answer 1

第一件事是，将已获取的报价单数组存储到一个状态，这样，当您要显示其他报价时，就无需再次获取它。

this.state = {
  quoteArray: [],  <----- This one
  quote: "",
  author: ""
};

然后创建一个单独的函数，该函数将从那个quoteArray中获取随机报价

pickRandomQuote = () => {
   const ran = Math.floor(Math.random() * data.quotes.length);      
   this.setState({
     quote: this.state.quoteArray[ran].quote,
     author: this.state.quoteArray[ran].author
   });
}

在获取函数中，将获取的数组存储到状态，然后在之后调用pickRandomQuote

fetchData = () => {
    fetch(
"https://gist.githubusercontent.com/camperbot/5a022b72e96c4c9585c32bf6a75f62d9/raw/e3c6895ce42069f0ee7e991229064f167fe8ccdc/quotes.json"
    )
      .then(result => {
        return result.json();
      })
      .then(data => {
        this.setState({
          quoteArray: data
        });
        this.pickRandomQuote();
      });
  };

然后生成新的随机报价，只需将其放在您的按钮中

<button onClick={() => this.pickRandomQuote()}>next quote</button>

Answer 2

渲染：<button onClick={this.fetchData}>next quote</button>

构造函数：

constructor(props) {
  super(props);
  this.state = {
    quote: "",
    author: ""
  };
  this.fetchData = this.fetchData.bind(this);
}

我如何在ReactJS中更新提取请求

2 个答案: