How to make Country and City Selection Simple as Category Selection when posting an ad?

You might be a le to find select box / autocomplete guide on docs, if you want to have select boxes only

Thanks, Can you provide link or folder for it? tried to find in docs but couldn't get properly.

Go to docs and type "autocomplete" 

Thanks, but this looks to be an old documentation/codes. I tried to find codes but these codes are different in different files. found only first two codes.
other code are not showing according beta or omega theme.

Please provide new codes here if possible.