separating event listeners to initialize when needed
separating event listeners to initialize when needed

Signed-off-by: Connie Berardi <37b36aa3e06f599c36fb6e81680d98fd9bc00e23@intel.com>

dliu32x/webapps-flashcards,01org/webapps-flashcards,SiyuanZeng/webapps-flashcards,01org/webapps-flashcards