Solved - $(...).select2 is not a function

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 Some time we face a common problem with select2 if select2 library added to all pages and js function too but selection did not exist or was not loaded. So we can fix that issue using below method:

Make sure $("#selector") is exists or not.

if ( $("#selector").length > 0 ){     //Check selection
     $("#selector").select2();    // Call select 2
}

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