The data of the React component can be obtained through Ajax in the componentDidMount method. When the data is obtained from the server, the data can be stored in the state, and then the UI can be re-rendered using the this.setState method.

React AJAX syntax

When using asynchronous loading of data, use componentWillUnmount to cancel outstanding requests before the component is unloaded.

React AJAX example

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>php.cn React 实例</title>
    <script src="https://cdn.bootcss.com/react/15.4.2/react.min.js"></script>
	<script src="https://cdn.bootcss.com/react/15.4.2/react-dom.min.js"></script>
	<script src="https://cdn.bootcss.com/babel-standalone/6.22.1/babel.min.js"></script>
    <script src="https://cdn.bootcss.com/jquery/2.1.4/jquery.min.js"></script>
  </head>
 <body>
    <div id="example"></div>
    <script type="text/babel">
      var UserGist = React.createClass({
        getInitialState: function() {
          return {
            username: '',
            lastGistUrl: ''
          };
        },

        componentDidMount: function() {
          this.serverRequest = $.get(this.props.source, function (result) {
            var lastGist = result[0];
            this.setState({
              username: lastGist.owner.login,
              lastGistUrl: lastGist.html_url
            });
          }.bind(this));
        },

        componentWillUnmount: function() {
          this.serverRequest.abort();
        },

        render: function() {
          return (
            <div>
              {this.state.username} 用户最新的 Gist 共享地址：
              <a href={this.state.lastGistUrl}>{this.state.lastGistUrl}</a>
            </div>
          );
        }
      });

      ReactDOM.render(
        <UserGist source="https://api.github.com/users/octocat/gists" />,
        document.getElementById('example')
      );
    </script>
  </body>
</html>

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