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mattpodwysocki/users.html

Created April 15, 2015 21:25
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Getting a list of users with RxJS and JSX
Raw
users.html
<!DOCTYPE html>
<html>
<head>
<meta http-equiv='Content-type' content='text/html; charset=utf-8'>
<title>Basic Example with JSX</title>
<link rel="stylesheet" href="base.css" />
</head>
<body>
<h1>ReactJs + RxJs</h1>
<div id="container">
<p>
If you can see this, React is not working right.
If you checked out the source from GitHub make sure to run <code>grunt</code>.
</p>
</div>
<h4>Example Details</h4>
<p>This is written with JSX and transformed in the browser.<p>
<script src="https://code.jquery.com/jquery-2.1.3.js"></script>
<script src="http://fb.me/react-0.13.1.min.js"></script>
<script src="http://fb.me/JSXTransformer-0.13.1.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/2.5.1/rx.all.js"></script>
<script type="text/jsx">
function getData(url) {
return jQuery.ajax({
url: url,
dataType: 'jsonp'
}).promise();
}
var subject = new Rx.BehaviorSubject('https://api.github.com/users');
var responseStream = subject.flatMap(getData);
var ExampleApplication = React.createClass({
getInitialState: function() {
return { data: [] };
},
componentDidMount: function() {
var self = this;
responseStream.subscribe(function (response) {
self.setState( { data: response.data } );
self.forceUpdate();
});
},
getMoarUsers: function(e){
var randomOffset = 'https://api.github.com/users?since=' + Math.floor(Math.random()*500);
subject.onNext(randomOffset);
},
render: function() {
var message = this.state.data.map(function (user) {
return (
<div>
{user.login}
</div>
);
});
return (<div>
{message}
<div><button onClick={ this.getMoarUsers }>Get moar users</button></div>
</div>);
}
});
React.render(
<ExampleApplication />,
document.getElementById('container')
);
</script>
</body>
</html>
@zxbodya
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zxbodya commented Apr 17, 2015

A bit off topic, but likely this would be quite helpful for anyone who are starting to work with React and Rx.
It is what I learned while using Rx with React:
https://gist.github.com/zxbodya/20c63681d45a049df3fc

In short - It is better to create stream of elements to render, instead of creating complicated component that will render data directly from streams.

Just to illustrate what I mean - example above can be rewritten as following:

function getData(url) {
  return jQuery.ajax({
    url: url,
    dataType: 'jsonp'
  }).promise();
}

var subject = new Rx.BehaviorSubject('https://api.github.com/users');

var responseStream = subject
  .flatMap(getData)
  .map(function (response) {
    return response.data;
  });

function getMoreUsers() {
  var randomOffset = 'https://api.github.com/users?since=' + Math.floor(Math.random() * 500);
  subject.onNext(randomOffset);
}

var ExampleApplication = React.createClass({
  render: function () {
    var message = this.props.data.map(function (user) {
      return (<div>{user.login}</div>);
    });

    return (
      <div>
        {message}
        <div>
          <button onClick={this.props.getMoreUsers}>Get moar users</button>
        </div>
      </div>
    );
  }
});

var container = document.getElementById('container');
Rx.Observable.return([]).merge(responseStream)
.subscribe(function (data) {
  React.render(<ExampleApplication data={data} getMoreUsers={getMoreUsers}/>, container);
});

Just some of benefits:

  • ExampleApplication can be optimised using pure render mixin
  • ExampleApplication is just a view - nothing complicated inside (easier to test or reuse)
  • it is "more isomorphic" almost the same code can be used on server side
  • no need to pass default value(we can replace Rx.Observable.return([]).merge(responseStream) above by just responseStream, and first render will happen after data will be received)

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