# onKey
`onKey(self, event, key)`<br>
The computercraft event which triggers this method is `key` and `char`.

Here is a example on how to add a onKey event to your frame:

```lua
local basalt = require("basalt")

local main = basalt.createFrame()
local subFrame = main:addFrame()
  :setPosition(3,3)
  :setSize(18,6)
  :hide()

function openSubFrame(self, event, key)
  if(key==keys.c)then
    subFrame:show()
  end
end
main:onKey(openSubFrame)
```