vcf-chat | Vaadin

Chat implementation with virtual scroll, infinite scroll and scrolling from bottom to top

vcf-chat Web Component

Gitter Published on Vaadin  Directory

<vcf-chat> is a Web Component chat implementation with virtual and infinite scroll. vcf-chat uses vcf-avatar to show senders/recippients avatars. New messages apears in a bootom of message list.

Live Demo ↗


<vcf-chat lazy-load-trigger-offset="300">
  <div class="loading-indicator" slot="loading-indicator">
Screenshot of vcf-chat


This components is distributed as Bower packages.

Polymer 2 and HTML Imports compatible version

Install vcf-chat:

bower i vaadin/vcf-chat --save

Once installed, import it in your application:

<link rel="import" href="bower_components/vcf-chat/vcf-chat.html">

Getting Started

Vaadin components use the Lumo theme by default.

The file structure for Vaadin components

  • src/vcf-chat.html

    Unstyled component.

  • theme/lumo/vcf-chat.html

    Component with Lumo theme.

  • vcf-chat.html

    Alias for theme/lumo/vcf-chat.html

Running demos and tests in browser

  1. Fork the vcf-chat repository and clone it locally.

  2. Make sure you have npm installed.

  3. When in the vcf-chat directory, run npm install and then bower install to install dependencies.

  4. Run polymer serve --open, browser will automatically open the component API documentation.

  5. You can also open demo or in-browser tests by adding demo or test to the URL, for example:

Running tests from the command line

  1. When in the vcf-chat directory, run polymer test

Following the coding style

We are using ESLint for linting JavaScript code. You can check if your code is following our standards by running gulp lint, which will automatically lint all .js files as well as JavaScript snippets inside .html files.


  • Make sure your code is compliant with our code linters: gulp lint
  • Check that tests are passing: polymer test
  • Submit a pull request with detailed title and description
  • Wait for response from one of Vaadin components team members

Vaadin Prime

This component is available in Vaadin Prime subscription. It is still open source, but you need to have a valid CVAL license in order to use it. Read more at:


Commercial Vaadin Add-on License version 3 (CVALv3). For license terms, see LICENSE.

Vaadin collects development time usage statistics to improve this product. For details and to opt-out, see


Link to this version
ImportedReleased 17 October 2019Other
Framework Support
Polymer 2.0+
Polymer 3.0+
Browser Independent
Install with
bower install --save vaadin-component-factory/vcf-chat"#1.2.0"
Run the above Bower command in your project folder. If you have any issues installing, please contact the author.
Release notes - Version 1.2.0


  • polymer#^2.0.0
  • vaadin-themable-mixin#vaadin/vaadin-themable-mixin#^1.0.0
  • vaadin-license-checker#vaadin/license-checker#^2.0.1
  • vaadin-lumo-styles#vaadin/vaadin-lumo-styles#^1.0.0
  • vaadin-element-mixin#^2.1.2
  • iron-list#v2.0.16
  • vaadin-text-field#^2.1.2
  • vaadin-button#^2.1.0
  • vcf-avatar#vaadin-component-factory/vcf-avatar#^1.3.0
  • vaadin-progress-bar#vaadin/vaadin-progress-bar#^1.1.0