I am trying to implement asynchronous XMLHttpRequest in react.
Here is my attempt:

```js
var xhr = new XMLHttpRequest();
var json_obj, status = false;
xhr.open("GET", "https://jsonplaceholder.typicode.com/photos/", true);
xhr.onload = function (e) {
  if (xhr.readyState === 4) {
    if (xhr.status === 200) {
      json_obj = xhr.responseText;
      status = true;
    } else {
      console.error(xhr.statusText);
    }
  }
};
xhr.onerror = function (e) {
  console.error(xhr.statusText);
};
xhr.send(null);

class Welcome extends React.Component {
  render() {
    return (
      <div>
          <img src= {status ?  json_obj[0].url : 'loading...'}></img>
      </div>
    );
  }
}
ReactDOM.render(
   <Welcome/>,
   document.getElementById('root')
);
```

```html
<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>
<div id="root"></div>
```

I have been thinking about adding listener to it but i don't know how to do it.

Overall i am having problem with an update after async XMLHttpRequest loads and returns value.