如何将数据从 getJSON 绑定到 ReactJS 状态

Question

我一直在尝试从 JSON 文件中获取数据并使用 ReactJS 将其绑定到我的页面

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>Demo Fetch</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.13.3/react.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.13.3/JSXTransformer.js"></script>
    <script src="js/jquery-2.1.4.min.js"></script>
</head>
<body>
    <div id="content"></div>
    <script type="text/jsx">
        var DataBlock = React.createClass({
            getInitialState:function(){
                return {};
            },
            loadData:function() {
                var a=this;
                $.getJSON(this.props.url, function (obj) {
                    a.setState({data: obj})
                });
            },
            render: function() {
                return (
                        <div className="dataBlock" data={this.state.data}>
                            <h1>Sample data block</h1>
                                {this.loadData()}
                                <h3>{data.runtime}</h3>
                        </div>
                );
            }
        });
        React.render(
                <DataBlock url="small_data.json"/>,
                document.getElementById('content')
        );
    </script>
</body>
</html>

但是当我尝试显示页面时什么也没有显示。我的代码有什么问题？它的错误在哪里？为什么我不能将来自 getJSON 的数据绑定到我的 React 组件的状态？

这是我的 small_data.json 文件：

{
  "movies": [
    {
      "abridged_cast": [
        {
          "characters": [
            "Dominic Toretto"
          ],
          "id": "162652472",
          "name": "Vin Diesel"
        },
        {
          "characters": [
            "Brian O'Conner"
          ],
          "id": "162654234",
          "name": "Paul Walker"
        }
      ],
      "runtime": 140,
      "synopsis": "Continuing the global exploits in the unstoppable franchise built on speed, Vin Diesel, Paul Walker and Dwayne Johnson lead the returning cast of Fast & Furious 7. James Wan directs this chapter of the hugely successful series that also welcomes back favorites Michelle Rodriguez, Jordana Brewster, Tyrese Gibson, Chris \"Ludacris\" Bridges, Elsa Pataky and Lucas Black. They are joined by international action stars new to the franchise including Jason Statham, Djimon Hounsou, Tony Jaa, Ronda Rousey and Kurt Russell.",
      "title": "Furious 7",
      "year": 2015
    }
  ],
  "runtime": 140
}

Answer 1

你需要使用componentDidMount: function() { 加载数据

import React from 'react';
import ReactDOM from 'react-dom';

const data = {
  "movies": [
    {
      "abridged_cast": [
        {
          "characters": [
            "Dominic Toretto"
          ],
          "id": "162652472",
          "name": "Vin Diesel"
        },
        {
          "characters": [
            "Brian O'Conner"
          ],
          "id": "162654234",
          "name": "Paul Walker"
        }
      ],
      "runtime": 140,
      "synopsis": "Continuing the global exploits in the unstoppable franchise built on speed, Vin Diesel, Paul Walker and Dwayne Johnson lead the returning cast of Fast & Furious 7. James Wan directs this chapter of the hugely successful series that also welcomes back favorites Michelle Rodriguez, Jordana Brewster, Tyrese Gibson, Chris \"Ludacris\" Bridges, Elsa Pataky and Lucas Black. They are joined by international action stars new to the franchise including Jason Statham, Djimon Hounsou, Tony Jaa, Ronda Rousey and Kurt Russell.",
      "title": "Furious 7",
      "year": 2015
    }
  ],
  "runtime": 140
}

const DataBlock = React.createClass({
    getInitialState: () => {
      return {
        data: null
      };
    },

    componentDidMount: () => {
                this.setState({
                    data: this.props.url
                });   
   },             
    render() {
        return <div>
        <h3>runtime: {data.runtime}</h3>
        <h4>the data:</h4> 
        {this.state.data}
        </div>;
    }
});


ReactDOM.render(<DataBlock url={data}/>, document.getElementById('.container'));

https://jsfiddle.net/63nL7yfj/

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