How to get the element value?

Aleksandr_Markelovif You need a click to take the value from the trail. him block, then all blocks in the array and get the value at this index + 1
Option 2: using jq method .next()
Option 3: add some data-* and determine the desired unit

Ps but it seems to me that you originally came up with some "wonderful"(not Mat) structure and are now trying it has something/to do something.... well or simple - don't need the tonsils through the f**got cut

Start to study design and will, or some nonsense to do... my IMHO

do reference blocks at once

\r\r\r\r\r\r\r

$('.block1').on('click', function(){ var id = $(this).data('block'); $('#'+id).blabla(); });

Ajtishniki, of course, to generate randomly in the output markup

PS
This method is good because it depends on the html structure: block2 can be located anywhere relative to the block1.