About The Resource Pack's Installation...

Can you make it so the resource pack will begin installing as soon as you enter the server lobby? Because even though I have followed all of the steps on how to get the resource pack working, it still won't install, and the reason why I think it should install as soon as you get to the lobby, is because as soon as I join a server, the resource pack will begin downloading, but will be almost immediately cancelled because the server automatically opens up the class selection menu as it begins to open the resource pack. Another reason is probably because that when I join a server, I fall through the floor as soon as I spawn in and either the game lags and brings you back up, or you're falling out of the map boundaries and the class selection automatically opens up.