Send Button Disabled Until Text Typed - Half Done - Please Help

Hi, i have a chat program and dont want users to be able to send messages without typing anything, i have got the send button disabled on loading, but dont no how to re enable it.
how do i get it to react to a keyboard event?
thanks.

> is implementing that easy? or alot of code?
False dilemmaDo you walk to work, or take your lunch?

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