Twitter-style autocomplete in textarea

Another great library which solves this problem At.js (deprecated)

Source

Demo

They are now suggesting the Tribute library

https://github.com/zurb/tribute

Example

I'm sure your problem is long since solved, but jquery-textcomplete looks like it would do the job.

Have you tried this

GITHUB: https://github.com/podio/jquery-mentions-input

DEMO/CONFIG: http://podio.github.io/jquery-mentions-input/

It is pretty simple to implement.

I've created a Meteor package for this purpose. Meteor's data model allows for fast multi-rule searching with custom rendered lists. If you're not using Meteor for your web app, (I believe) you unfortunately won't find anything this awesome for autocompletion.

Autocompleting users with @, where online users are shown in green:

In the same line, autocompleting something else with metadata and bootstrap icons:

Fork, pull, and improve:

https://github.com/mizzao/meteor-autocomplete