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Contributing Guide

We will happily accept contributions to Onsen UI. It can be both fixes for bugs or typos or even new features that extend Onsen UI.

The basic workflow when making contributions is the following:

After you've made a pull request we will review it. If everything is fine and we like the change the contribution will be pulled into the main Onsen UI repository. In the case where there are some issues with the code or we disagree with how it's been implemented we will describe the issues in the comments so they can be corrected.

Source Code Structure

The following is an overview of how the source code is structured to give contributors an idea of where to look when making changes.

Please don't make changes directly to generated files like onsenui.js and onsenui.css!


Onsen UI elements are made on top of Web Components. The source code is located in core/src/. This directory contains every single element in Onsen UI core and also internal functionality.


We wrap Onsen UI core with extra libraries to make it work better with some specific frameworks. The source code of these libraries is located in bindings.

Style Sheets

Most of the style is defined in a separate project called Onsen CSS Components which is located here.

Changes to the style should be made by editing the files in this directory. These files will compile into the onsen-css-components.css file.

There is also a stylesheet that is specific to the custom elements called onsenui.css, this file is compiled from the files in this directory.

Development Setup

You will need a recent version of Node.js and Yarn before continuing.

Clone this repository and run the following commands to build the project:

$ (cd css-components && yarn install)
$ yarn install
$ (cd bindings/angular1 && yarn install) # TODO: Remove after 2.11.0
$ yarn build

The files will be built and copied into OnsenUI/build folder.

If you want to work with some bindings, like vue, you need to run the following commands:

$ cd bindings/vue
$ yarn install

It is also possible to serve the files for development and running examples:

$ yarn dev
$ gulp serve --css --core --angular1 --vue # Or any combination

Code Style

There are some things to keep in mind when making code contributions to Onsen UI. The code must adhere to the general code style used.

Here is a list of some rules that should be followed:

  • Code should be properly indented. Onsen UI uses two-space indentation in both HTML and JavaScript. Please don't use tabs for indentation.
  • Separate binary operators with spaces: var x = 1+1 is incorrect, it should be written as: var x = 1 + 1.
  • if, while, for, etc. should be separated from the parenthesis with a space.
  • Use easy-to-understand and logical naming for your variables and method names, especially for variables and methods that are exposed to the user.
  • Internal APIs should be preceded by an underscore.
  • Use single quotes for strings in JavaScript and double quotes for attributes in HTML.

Commit Message Format

We follow rules similar to those of AngularJS for commit messages.

<type>(<scope>): <subject>

Type should be one of these:

  • feat: A new feature
  • fix: A bug fix
  • docs: Documentation only changes
  • style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
  • refactor: A code change that neither fixes a bug or adds a feature
  • perf: A code change that improves performance
  • test: Adding missing tests
  • chore: Changes to the build process or auxiliary tools and libraries such as documentation generation

Scope should contain, if applicable, the modified Onsen UI element such as ons-navigator, ons-switch, etc. It could also contain descriptive words like core, dependencies, etc.

Subject reflects and summarizes the content of the commit.

Running Tests

Onsen UI has unit tests for the Web Components as well as end-to-end testing of the binding libraries using Protractor.

Use the following commands to run the unit tests:

$ gulp unit-test

or these commands for end-to-end testing of the binding libraries:

$ cd bindings/angular1
$ gulp e2e-test
$ cd bindings/angular2
$ npm install
$ gulp e2e-test

It will take some time the because it will download a stand-alone Selenium Server and a Chrome webdriver the first time it's executed.

To run a single test or a group of tests use the --specs parameter and provide a comma-separated list of spec files:

$ cd bindings/angular1
$ gulp e2e-test --specs test/e2e/lazyRepeat/scenarios.js

In order to run both the unit tests and the end-to-end tests use the following command:

$ gulp test


Onsen UI's documentation is generated directly from each file's source code, using Onsen UI's own wcdoc tool. The syntax will be familiar if you have used JSDoc before. Running this tool generates JSON files which are stored in build/docs. These JSON files are then used by the repository to generate the documentation you see on the website.


Assuming you have already set up the Onsen UI repository, the other thing you need to do is set up the repository. Follow the instructions in that README to get it set up, but stop when you get to the comment Checkout and build the latest revision of Onsen UI 2. Instead of using the version of Onsen UI from GitHub, you want to use your local repository. The easiest way to do this is to create a symlink. Assuming your Onsen UI repository is at ~/dev/onsen/OnsenUI and your repository is at ~/dev/onsen/, the command would look like this (on MacOS and Linux):

ln -s ~/dev/onsen/OnsenUI ~/dev/onsen/

Modifying Documentation

Once this is all set up, follow these steps to modify the documentation.

  1. Onsen UI: Modify the documentation comments in the relevant JS file
  2. Onsen UI: Run gulp build-docs
  3. If you are changing the React docs, there are extra steps. Otherwise, skip to step 4.
    • Onsen UI: Build the React Docs: cd bindings/react && yarn install && yarn run gen-docs
    • Delete the React doc cache, if it exists: rm -r .reactdoc
  4. Run gulp serve --lang en

The React documentation is built separately and cached because it takes a while to build. So, if you make changes to the documentation of React bindings, ensure you follow step 3 or you may not see your changes reflected.

Release Procedure

Follow these steps to release a new version of Onsen UI. You will need to have permission to publish to Onsen UI's npm to complete these steps.

If you are publishing both the Onsen UI core and bindings at the same time, release the core first and then the bindings.

Core Release

Before starting a release, check the following:

  • Run the tests and confirm that they are passing (npm test, or check CircleCI)
    • For a major release with fundamental changes, all components must be tested on all supported platforms
  • If there are any new components, ensure they work in the Theme Roller
  • Check the Issues and ensure there are no outstanding breaking issues
  • Check and ensure that all the latest fixes and features are listed. Usually they are not because pull requests do not tend to modify the changelog. Compare it to the git log and add anything that is missing.

Once you have done the pre-release checks above, follow the steps below to publish the core.

  • Increase the version number
    • Change dev to the new version number
    • package.json: Change version to the new version number
    • Commit and push these changes, with a commit message like: chore(*): Bump 2.10.2
  • Merge master into production, and push
    • git checkout production && git merge master && git push
  • Tag production with the version number, and push
    • e.g. git tag 2.10.2 && git push --tags
  • Run the release script
    • cd scripts && ./
    • This script builds Onsen UI to get it ready for release, which involves pulling the OnsenUI-dist repo. Once the script has finished, the built files, ready for release, will be located in the OnsenUI-dist folder. The OnsenUI-dist repository will also have been automatically tagged with the new version and pushed.
  • Publish to npm. This will also cause the Bower package to be updated.
    • cd ../OnsenUI-dist && npm publish

Then, on GitHub, create new releases for OnsenUI and OnsenUI-dist.

Finally, update monaca/monaca-component-onsenui:

  1. git clone the repo
  2. npm install onsenui -g --prefix . to get the latest onsenui
  3. Copy relevant files in latest onsenui dir to monaca-component-onsenui dir (same way as past commits)
  4. Update package.json (and some other files) manually
  5. Commit changes
  6. Tag the new version (i.e. 2.10.6) to the new commit
  7. Push to GitHub

That's it! Your new Onsen UI version is released. 🎉

Releasing New Versions of Bindings

Releasing new versions of bindings is relatively straightforward.

  • Ensure the tests are passing and there are no outstanding breaking issues
  • Update the binding's package.json
    • Change version to the new version of the binding
    • If onsenui is listed in dependencies or peerDependencies, change its version to the latest available
    • Commit and push these changes, with a commit message like: chore(vue): Bump 2.6.0
  • Publish to npm. The bindings' package.json files contain prepublish commands, which will automatically build the bindings before publishing.
    • Inside the binding's root directory, run npm publish

That's it! Your new binding version is released. 🎉

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