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Contributing to Select2

Looking to contribute something to Select2? Here's how you can help.

Please take a moment to review this document in order to make the contribution process easy and effective for everyone involved.

Following these guidelines helps to communicate that you respect the time of the developers managing and developing this open source project. In return, they should reciprocate that respect in addressing your issue or assessing patches and features.

Using the issue tracker

When reporting bugs or requesting features, the issue tracker on GitHub is the recommended channel to use.

The issue tracker is not a place for support requests. The mailing list or IRC channel are better places to get help.

Reporting bugs with Select2

We really appreciate clear bug reports that consistently show an issue within Select2.

The ideal bug report follows these guidelines:

  1. Use the GitHub issue search — Check if the issue has already been reported.
  2. Check if the issue has been fixed — Try to reproduce the problem using the code in the master branch.
  3. Isolate the problem — Try to create an isolated test case that consistently reproduces the problem.

Please try to be as detailed as possible in your bug report, especially if an isolated test case cannot be made. Some useful questions to include the answer to are:

  • What steps can be used to reproduce the issue?
  • What is the bug and what is the expected outcome?
  • What browser(s) and Operating System have you tested with?
  • Does the bug happen consistently across all tested browsers?
  • What version of jQuery are you using? And what version of Select2?
  • Are you using Select2 with other plugins?

All of these questions will help others fix and identify any potential bugs.

Requesting features in Select2

Select2 is a large library that carries with it a lot of functionality. Because of this, many feature requests will not be implemented in the core library.

Before starting work on a major feature for Select2, contact the community first or you may risk spending a considerable amount of time on something which the project developers are not interested in bringing into the project.

Contributing changes to Select2

Select2 is made up of multiple submodules that all come together to make the standard and extended builds that are available to users. The build system uses Node.js to manage and compile the submodules, all of which is done using the Grunt build system.

Installing development dependencies

Select2 can be built and developed on any system which supports Node.js. The preferred Node.js version is 0.10, but 0.12 and later versions can be used without any noticeable issues. You can download Node.js at their website.

All other required Node.js packages can be installed using npm, which comes bundled alongside Node.js.

cd /path/to/select2/repo
npm install

You may need to install libsass on your system if it is not already available in order to build the SASS files which generate the CSS for themes and the main component.

In order to build and serve the documentation, you need to have Jekyll installed on your system.

Building the Select2 component

Select2 uses the Grunt build task system and defines a few custom tasks for common routines. One of them is the compile task, which compiles the JavaScript and CSS and produces the final files.

cd /path/to/select2/repo
grunt compile

You can also generate the minified versions (.min.js files) by executing the minify task after compiling.

cd /path/to/select2/repo
grunt minify

Building the documentation

Using the Grunt build system, you run Jekyll and serve the documentation locally. This will also set up the examples to use the latest version of Select2 that has been built.

cd /path/to/select2/repo
grunt docs

Running tests

Select2 uses the QUnit test system to test individual components.

cd /path/to/selct2/repo
grunt test

Submitting a pull request

We use GitHub's pull request system for submitting patches. Here are some guidelines to follow when creating the pull request for your fix.

  1. Make sure to create a ticket for your pull request. This will serve as the bug ticket, and any discussion about the bug will take place there. Your pull request will be focused on the specific changes that fix the bug.
  2. Make sure to reference the ticket you are fixing within your pull request. This will allow us to close off the ticket once we merge the pull request, or follow up on the ticket if there are any related blocking issues.
  3. Explain why the specific change was made. Not everyone who is reviewing your pull request will be familiar with the problem it is fixing.
  4. Run your tests first. If your tests aren't passing, the pull request won't be able to be merged. If you're breaking existing tests, make sure that you aren't causing any breaking changes.
  5. Only include source changes. While it's not required, only including changes from the src directory will prevent merge conflicts from occuring. Making this happen can be as a simple as not committing changes from the dist directory.

By following these steps, you will make it easier for your pull request to be reviewed and eventually merged.

Triaging issues and pull requests

Anyone can help the project maintainers triage issues and review pull requests.

Handling new issues

Select2 regularly receives new issues which need to be tested and organized.

When a new issue that comes in that is similar to another existing issue, it should be checked to make sure it is not a duplicate. Duplicates issues should be marked by replying to the issue with "Duplicate of #[issue number]" where [issue number] is the url or issue number for the existing issue. This will allow the project maintainers to quickly close off additional issues and keep the discussion focused within a single issue.

If you can test issues that are reported to Select2 that contain test cases and confirm under what conditions bugs happen, that will allow others to identify what causes a bug quicker.

Reviewing pull requests

It is very common for pull requests to be opened for issues that contain a clear solution to the problem. These pull requests should be rigorously reviewed by the community before being accepted. If you are not sure about a piece of submitted code, or know of a better way to do something, do not hesitate to make a comment on the pull request.

Reviving old tickets

If you come across tickets which have not been updated for a while, you are encouraged to revive them. While this can be as simple as saying :+1:, it is best if you can include more information on the issue. Common bugs and feature requests are more likely to be fixed, whether it is by the community or the developers, so keeping tickets up to date is encouraged.

Licensing

It should also be made clear that all code contributed to Select must be licensable under the MIT license. Code that cannot be released under this license cannot be accepted into the project.