fix onChange with placeholder on IE

[yiminghe]

IE 10/11 will fire input event when input renders if input's placeholder contains Chinese words:

plain: http://jsfiddle.net/yiminghe/fm3rckaz/2/
react: https://jsfiddle.net/yiminghe/69z2wepo/17145/

and other situations: https://connect.microsoft.com/IE/feedback/details/885747/ie-11-fires-the-input-event-when-a-input-field-with-placeholder-is-focused

[yiminghe]

btw: how to test on ie10?

grunt test --debug does not work any more

I have to grunt build and test build/react.js on my example page.

[afc163]

👍

[sophiebits]

At least some of this code would need to go in ChangeEventPlugin, because the event is already going to bubble by the time _handleChange is invoked in ReactDOMInput. _currentValue should also go within the ReactDOMInput-specific _wrapperState object; you shouldn't need to add anything to every ReactDOMComponent. I think it's hard/impossible to get the ReactDOMInput instance from ChangeEventPlugin though.

We don't run our tests in browsers any more. It wasn't something we used often and it got lost in one of our change to extract common modules to https://github.com/facebook/fbjs.

[yiminghe]

ok, have moved _currentValue to _wrapperState and prevent false change from bubbling (fortunately input can not has any child).

ChangeEventPlugin is already very complex, I think change in ReactDOMInput is easy and effective.

[sophiebits]

#4051 should have fixed this.