Vanilla JavaScript Plugin

Tribute.js  

An autocompleter plugin for selecting usernames by typing the @ symbol in input fields, textareas, or any element that supports contenteditable.

Plugin Website  Demo

Related plugins

autoCompleter  

An extremely lightweight and powerful completion suggester with lots of customization options. Used on Pixabay and plainJS.

horsey  

A fast, easy to use, reliable, and customizable autocomplete component.

Awesomplete  

Ultra lightweight, customizable, simple autocomplete widget - perfect for inline data lists.