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React v0.4.1

July 26, 2013 by Paul O’Shannessy

This blog site has been archived. Go to react.dev/blog to see the recent posts.

React v0.4.1 is a small update, mostly containing correctness fixes. Some code has been restructured internally but those changes do not impact any of our public APIs.


  • setState callbacks are now executed in the scope of your component.
  • click events now work on Mobile Safari.
  • Prevent a potential error in event handling if Object.prototype is extended.
  • Don’t set DOM attributes to the string "undefined" on update when previously defined.
  • Improved support for <iframe> attributes.
  • Added checksums to detect and correct cases where server-side rendering markup mismatches what React expects client-side.


  • Improved environment detection so it can be run in a non-browser environment.

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