My Minecraft chat doesn't work?

I got on Minecraft and my chat wouldn't work. It opens up fine but when I type, nothing comes out. Only the space key works. And when I press enter it just closes the chat and nothing comes up. There's no error or anything. I used it yesterday and it was working perfectly fine. I thought maybe something was wrong with my keyboard but all the buttons work fine for walking around, opening invintory, etc. I don't know what's wrong and its really frustrating!