Gravity and collision problem

[Mihrusha]

my guy have trouble with top collision - he jump throw it, bottom and side collision works, and have trouble with phisics-> guy can run in air after jumping, so i need its running will be only few milisecond and function stop process if i still press button, or  he fall after some time; Also have touble with top collision.
here code example.
https://gist.github.com/Mihrusha/76427bdd09aa27a27c1f4de4f9525238

[Mihrusha]

So when i render map phisics dont work properly, but when not render map sprites its work ok

[eXpl0it3r]

One way this is usually done is by detecting whether the character is on the ground or not
So if you have "continuous" bottom collision, you allow for full left/right movement.
If the player is in the air, you restrict the left/right movement but make sure to apply gravity.

Here is a very imperfect example I wrote a long time ago. It's very simplified and lots of potential to change, but maybe it can give you an idea.