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Contributing to Kendo UI Core

Before You Start

Anyone wishing to contribute to the Kendo UI Core project MUST read & sign the Kendo UI Core Contribution License Agreement. The Kendo UI team cannot accept pull requests from users who have not signed the CLA first.


These guidelines are here to facilitate your contribution and streamline the process of getting changes merged into this project and released. Any contributions you can make will help tremendously, even if only in the form of an issue report. Following these guidelines will help to streamline the pull request and change submission process.

Reporting Bugs

  1. Always update to the most recent master release; the bug may already be resolved.
  2. Search for similar issues in the issues list for this repo; it may already be an identified problem.
  3. Make sure you can reproduce your problem on our sandbox at
  4. If this is a bug or problem that is clear, simple, and is unlikely to require any discussion -- it is OK to open an issue on GitHub with a reproduction of the bug including workflows, screenshots, or links to examples on If possible, submit a Pull Request with a failing test. If you'd rather take matters into your own hands, fix the bug yourself (jump down to the "Code Fixes and Enhancements" section).

Requesting New Features

Do not submit a feature request on GitHub; all feature requests on GitHub will be closed. Instead, visit the Kendo UI Feedback portal, and search this list for similar feature requests.

Asking for Help

The Kendo UI team does not provide formal support for Kendo UI Core, except to those customers who have purchased a commercial license for Kendo UI (Professional, UI for MVC, etc.) or a support-only package from Please do not create support requests for this project in the issues list for this repo, as these will be immediately closed and you'll be directed to post your question on a community forum.

Code Fixes and Enhancements

1. Log an Issue

Before doing anything else, we ask that you file an issue in the Issues list for this project. First, be sure to check the list to ensure that your issue hasn't already been logged. If you're free and clear, file an issue and provide a detailed description of the bug or feature you're interested in. If you're also planning to work on the issue you're creating, let us know so that we can help and provide feedback.

2. Fork and Branch

Fork Us, Then Create A Topic Branch For Your Work

The work you are doing for your pull request should not be done in the master branch of your forked repository. Create a topic branch for your work. This allows you to isolate the work you are doing from other changes that may be happening.

Github is a smart system, too. If you submit a pull request from a topic branch and we ask you to fix something, pushing a change to your topic branch will automatically update the pull request.

Isolate Your Changes For The Pull Request

See the previous item on creating a topic branch.

If you don't use a topic branch, we may ask you to re-do your pull request on a topic branch. If your pull request contains commits or other changes that are not related to the pull request, we will ask you to re-do your pull request.

Branch from "master", not "production"

The "production" branch of the Kendo UI Core repository is for production maintenance code only. Never create a pull request from the production branch. Always create a branch for your work from the "master" branch. This will facilitate easier pull request management for the continuous work that is done in the master branch. If the issue is a bug fix that should be back ported to a maintenance branch, the core maintainers will cherry-pick it.

3. Include tests describing the bug or feature

Kendo UI uses QUnit for a test framework and karma as the test runner. You may browse the tests directory to get a better idea of the structure and conventions used.

To run the tests, execute the following command:

gulp tests

To run the tests for a single widget, pass a tests option:

gulp tests --tests="tests/listview/**.*.js"

By default, the tests run in Chrome. Other browser may be used using the browser option:

gulp tests --browser=Firefox

(optional) Squash your commits

When you've completed your work on a topic branch, you may squash your work down into fewer commits to make the merge process easier. For information on squashing via an interactive rebase, see the rebase documentation on GitHub

3. Submit a Pull Request

See Github's documentation for pull requests.

Pull requests are the preferred way to contribute to Kendo UI Core. Any time you can send us a pull request with the changes that you want, we will have an easier time seeing what you are trying to do. But a pull request in itself is not usually sufficient. There needs to be some context and purpose with it, and it should be done against specific branch.

Provide A Meaningful Description

It is very important to provide a meaningful description with your pull requests that alter any code. A good format for these descriptions will include:

  1. Why: The problem you are facing (in as much detail as is necessary to describe the problem to someone who doesn't know anything about the system you're building)

  2. What: A summary of the proposed solution

  3. How: A description of how this solution solves the problem, in more detail than item #2

  4. Any additional discussion on possible problems this might introduce, questions that you have related to the changes, etc.

Without at least the first 2 items in this list, we won't have any clue why you're changing the code. The first thing we'll ask, then, is that you add that information.

Code Style

All code contributed to this project should adhere to a consistent style, so please keep these in mind before you submit your Pull Requests:

  • Space indentation, size of 4
  • Semicolons are nice. Use them.
  • Double quotes
  • No trailing whitespace
  • Declare variables at the top of a scope
  • Return early
  • Be JSHint Valid

You can verify if your code passes the project JSHint options by running gulp jshint.

Beyond these, your best bet when in doubt is to follow idiomatic.js.