javascript - How data is filling when user start typing in search field -

i want make search box google web page:

i came across question: google-like search box angularjs directive

in accepted solution, i'm not able understand how (from where) data populating user start typing in search text box. on-change event handled textbox.

can please me this?

see this, idea not search result.

it search on click of button per functionality provided in plunker, , searched json file