Slash button doesn't work

Put the summary of the bug you're having here
When I was playing on a Server, my command and talk button wouldn't work.  So I went to single player, same thing. Next I switched Keyboards, Nothing. Lastly I reinstalled Minecraft, Still there. Please Help
What I expected to happen was...:
Describe what you thought should happen here
My command key would open the command
What actually happened was...:
Describe what happened here
Nothing just pure blankness
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...