Here is a free load screen maker:
http://heartcode.robertpataki.com/canvasloader/
This should be handy for all the html5 projects. I just don't know how to implemen it yet. If there's smarter people than me here I would like to hear your opinions.
It's really nice but it doesn't do loading bars it appears , only "infinite catch tail style". So you can't see the loading progress of the game.
fairly nice though
It is interesting to customize the load, but can not get the bar longer charges indefinitely.
Develop games in your browser. Powerful, performant & highly capable.
Sorry, you can't yet customise the loading screen in Construct 2 games, other than changing the logo.png image. It's on our todo list to improve this!