Does Construct2 have a "blur" expression

To reduce packages send, I want to implement this code into my server:

window.onblur = function()

{

    server.send(PLAYER_AFK, connection);

}

window.onfocus = function()

{

    server.send(PLAYER_NOT_AFK, connection);

}

But it would only work if Construct2 has Blur and Focus expressions.

I could not find them...

I found this one topic:

http://www.scirra.com/forum/losing-focus_topic57094.html

I hope there is a different way, else I might as well start writing a plugin for it.