2007 Elantra has no electricity. No light, no door dings, new battery, jump starting doesn't work.

Try removing the battery cables and cleaning the post then making sure cables are tight

step 1: you need an ODB11 reader, most AutoZones can rent you one to look for trouble codes.
Guess: the computer might be damaged.

Some cars have battery minders that have to be reset once the battery is removed. It is a device that senses low voltage and trips off to try to preserve remaining voltage inorder to start a car whose battery has run almost all the way down. Check your manual ..some minders will reset automatically others have to be manually reset.

Most likely a bad battery or battery terminal connection.

After connecting battery, try using key in drivers door to lock, and /or unlock. Try passenger if that doesn't work, as well as valet key if it came with one.

Sounds like an electrical issue. You'll want to take it in.

sounds like either the battery has failed or the alternator isnt charging

try main fuse in fuse box under hood also starter

from your comment,theres 3 things that can cause this,loose batt.post connection,weak batt.or something in elect. circuit that stays on after car is off and drains batt.,like underhood light,dome or truck light,what u can do is when u park car unhook batt. cable,make sure batt. is well charged,hook it up next day if car starts,its something that drains batt.in car! if it doesnt start,batt. needs replacing.i ruled out starter,dealer should have checked it to see if it was pulling too much amps,and that its easy to jump.

immobilizer has kicked in