setState() on an unmounted component warning

[flash1293]

The call to setState in the onload-handler should be guarded by isMounted. My app was adding some images and removing them due to ajax-updates before the image could be loaded. Thus the call inside onload was trying to set the state of an unmounted component.

img.onload = function() {
      if(self.isMounted()) {
        self.setState({loaded: true})
      }
}