Question

我对React JS来说是全新的，我正在尝试创建一个应用程序，它将从一个pokemon API中获取JSON数据，然后我将用它来显示在屏幕上。现在，我设置它，以便用户必须输入他们正在寻找的宠物小精灵的名称，即皮卡丘，当按下搜索按钮时，应用程序将进行API调用以返回JSON。我一直在寻找这几天，似乎无法找到任何与我目前设置代码的方式一起工作。如何将JSON输出绑定到我能够向用户显示的组件？

这是js代码（App.js）

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';
import ReactDOM from 'react-dom';
class App extends Component {
	constructor(props) {
    super(props);
    this.state = {value: ''};
    this.handleChange = this.handleChange.bind(this);
    this.handleSubmit = this.handleSubmit.bind(this);
  }
  

   handleChange(event) {
    this.setState({value: event.target.value});
  }

  handleSubmit(event) {
    alert('Text field value is: ' + this.state.value);

		fetch('https://pokeapi.co/api/v2/pokemon/'+this.state.value+'/')  
		  .then(  
			function(response) {  
			  if (response.status !== 200) {  
				console.log('Looks like there was a problem. Status Code: ' +  
				  response.status);  
				return;  
			  }
			  // Examine the text in the response  
			  response.json().then(function(data) {  
				console.log(data.name +" "+ data.id);  

			  });  
			} 
		  )  
		  .catch(function(err) {  
			console.log('Fetch Error :-S', err);  
		  });

		  }


  render() {
	  
	  
	  
    return (
    
    
    
      <div className="App">
      
      
        <div className="App-header">
          <img src={logo} className="App-logo" alt="logo" />
          <h2>Welcome to React</h2>
        </div>
        
        <input type="text"
        placeholder="enter name of pokemon here"
        value={this.state.value}
        onChange={this.handleChange}
        />
        <button type="button" onClick={this.handleSubmit}>Search the Pokedex</button>
        
        
      </div>
      
      
      
    );
    
    
    
  }
}
export default 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>
<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
    <!--
      Notice the use of %PUBLIC_URL% in the tag above.
      It will be replaced with the URL of the `public` folder during the build.
      Only files inside the `public` folder can be referenced from the HTML.

      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
      work correctly both with client-side routing and a non-root public URL.
      Learn how to configure a non-root public URL by running `npm run build`.
    -->
    <title>React App</title>
  </head>
  <body>
    <div id="root"></div>
    <!--
      This HTML file is a template.
      If you open it directly in the browser, you will see an empty page.

      You can add webfonts, meta tags, or analytics to this file.
      The build step will place the bundled scripts into the <body> tag.

      To begin the development, run `npm start`.
      To create a production bundle, use `npm run build`.
    -->
  </body>
</html>

问题截图： http://imgur.com/a/g9H5r

Answer 1

试试这个

＆＃13;

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';
import ReactDOM from 'react-dom';
class App extends Component {
	constructor(props) {
    super(props);
    this.state = {
      value: '',
      data: {} //filled by fetch data from API
    };
  }
  

   handleChange(event) {
    this.setState({value: event.target.value});
  }

  handleSubmit(event) {
    alert('Text field value is: ' + this.state.value);
     var _this = this;
		fetch('https://pokeapi.co/api/v2/pokemon/'+this.state.value+'/')  
		  .then(  
			function(response) {  
			  if (response.status !== 200) {  
				console.log('Looks like there was a problem. Status Code: ' +  
				  response.status);  
				return;  
			  }
			  // Examine the text in the response  
			  response.json().then(function(data) {  
				console.log(data.name +" "+ data.id);
                _this.setState({data: data});

			  });  
			} 
		  )  
		  .catch(function(err) {  
			console.log('Fetch Error :-S', err);  
            _this.setState({data: {}});
		  });

		  }


  render() {
	  
	  var data = this.state.data;
	  
    return (
    
    
    
      <div className="App">
      
      
        <div className="App-header">
          <img src={logo} className="App-logo" alt="logo" />
          <h2>Welcome to React</h2>
        </div>
        
        <input type="text"
        placeholder="enter name of pokemon here"
        value={this.state.value}
        onChange={this.handleChange.bind(this)}
        />
        <button type="button" onClick={this.handleSubmit.bind(this)}>Search the Pokedex</button>
      <h3>{data.id}</h3>       
      <h3>{data.name}</h3>
        
      </div>
      
      
      
    );
   
  }
}

ReactDOM.render(App, document.getElementById("root"));

＆＃13;

<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>
<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
    <!--
      Notice the use of %PUBLIC_URL% in the tag above.
      It will be replaced with the URL of the `public` folder during the build.
      Only files inside the `public` folder can be referenced from the HTML.

      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
      work correctly both with client-side routing and a non-root public URL.
      Learn how to configure a non-root public URL by running `npm run build`.
    -->
    <title>React App</title>
  </head>
  <body>
    <div id="root"></div>
    <!--
      This HTML file is a template.
      If you open it directly in the browser, you will see an empty page.

      You can add webfonts, meta tags, or analytics to this file.
      The build step will place the bundled scripts into the <body> tag.

      To begin the development, run `npm start`.
      To create a production bundle, use `npm run build`.
    -->
  </body>
</html>

＆＃13;

React JS将JSON作为状态访问

1 个答案: