make Input component not triggers onChange when input method is composing Chinese character

[alibaba-fusion]

make Input component not triggers onChange when input method is composing Chinese character

[bindoon]

It seems good. welcome PR.

[vicerwang]

A great idea！But we also should notice that using Input in Form, if we offer another onChange property such as onFinalValueChange or onCompositedVauleChange, in situation of this issue it may be a bit tricky as Form will only use onChange property. So is it better to offer an API such as composition to determine when to trigger an change event，if it is true，we will receive the real time value in onChange callback，otherwise we will receive the final value，it's default value is true as compatibility.

[ileenhow]

@vicerwang I have thought about implementing it like you said. But if we depend on another boolean prop composition to call onChange or not, we have to add some logic in onChange, and when using Input as a controlled component, the value will not be updated as normal, you can read this article for detail, or loot at the demo I created.

Certainly, using Input in Form is a common case, but I haven't figure out how to archive this without modifying onChange.

[vicerwang]

@ileenhow Thank you for your reply, it seems that my idea is not working due to the limitations of the react. In addition, if we use Input in the Form, the onChange is actually enough, because whether you click the submit button or enter the return, it will trigger onCompositionEnd first, so we always get the final value of the input. Now i think your solution will work well.

[bindoon]

Input can accept the original props to input element.