d2l-labs-attribute-picker

Note: this is a "labs" component. While functional, these tasks are prerequisites to promotion to BrightspaceUI "official" status:

• [ ] Design organization buy-in
• [ ] design.d2l entry
• [ ] Architectural sign-off
• [ ] Continuous integration
• [ ] Cross-browser testing
• [ ] Unit tests (if applicable)
• [ ] Accessibility tests
• [ ] Visual diff tests
• [ ] Localization with Serge (if applicable)
• [ ] Demo page
• [ ] README documentation

Autocompleting dropdown to choose one or more new or pre-existing attributes.

Installation

To install from NPM:

npm install @brightspace-ui-labs/attribute-picker

Usage

<script type="module">
    import '@brightspace-ui-labs/attribute-picker/attribute-picker.js';
</script>
<d2l-labs-attribute-picker>My element</d2l-labs-attribute-picker>

Properties:

Accessibility:

To make your usage of d2l-labs-attribute-picker accessible, use the following properties when applicable:

Events: The d2l-labs-attribute-picker dispatches the d2l-attributes-changed event each time an attribute has been added or removed. It will return the updated list of attributes:

attributePicker.addEventListener('d2l-attributes-changed', (e) => {
  console.log(e.detail.attributeList.toString());
});

The d2l-labs-attribute-picker dispatches the d2l-attribute-limit-reached event when the user attempts to enter an attribute greater than the limit. This can be used to send feedback to the user.

Developing, Testing and Contributing

After cloning the repo, run npm install to install dependencies.

Running the demos

To start an es-dev-server that hosts the demo page and tests:

npm start

Linting

# eslint and lit-analyzer
npm run lint

# eslint only
npm run lint:eslint

# lit-analyzer only
npm run lint:lit

Testing

# lint, unit test and visual-diff test
npm test

# lint only
npm run lint

# unit tests only
npm run test:headless

# debug or run a subset of local unit tests
# then navigate to `http://localhost:9876/debug.html`
npm run test:headless:watch

Visual Diff Testing

This repo uses the @brightspace-ui/visual-diff utility to compare current snapshots against a set of golden snapshots stored in source control.

# run visual-diff tests
npm run test:diff

# subset of visual-diff tests:
npm run test:diff -- -g some-pattern

# update visual-diff goldens
npm run test:diff:golden

Golden snapshots in source control must be updated by Travis CI. To trigger an update, press the "Regenerate Goldens" button in the pull request visual-difference test run.

Versioning, Releasing

TL;DR: Commits prefixed with fix: and feat: will trigger patch and minor releases when merged to master. Read on for more details...

The sematic-release GitHub Action is called from the release.yml GitHub Action workflow to handle version changes and releasing.

Version Changes

All version changes should obey semantic versioning rules:

1. MAJOR version when you make incompatible API changes,
2. MINOR version when you add functionality in a backwards compatible manner, and
3. PATCH version when you make backwards compatible bug fixes.

The next version number will be determined from the commit messages since the previous release. Our semantic-release configuration uses the Angular convention when analyzing commits:

• Commits which are prefixed with fix: or perf: will trigger a patch release. Example: fix: validate input before using
• Commits which are prefixed with feat: will trigger a minor release. Example: feat: add toggle() method
• To trigger a MAJOR release, include BREAKING CHANGE: with a space or two newlines in the footer of the commit message
• Other suggested prefixes which will NOT trigger a release: build:, ci:, docs:, style:, refactor: and test:. Example: docs: adding README for new component

To revert a change, add the revert: prefix to the original commit message. This will cause the reverted change to be omitted from the release notes. Example: revert: fix: validate input before using.

Releases

When a release is triggered, it will:

• Update the version in package.json
• Tag the commit
• Create a GitHub release (including release notes)
• Deploy a new package to NPM

Releasing from Maintenance Branches

Occasionally you'll want to backport a feature or bug fix to an older release. semantic-release refers to these as maintenance branches.

Maintenance branch names should be of the form: +([0-9])?(.{+([0-9]),x}).x.

Regular expressions are complicated, but this essentially means branch names should look like:

• 1.15.x for patch releases on top of the 1.15 release (after version 1.16 exists)
• 2.x for feature releases on top of the 2 release (after version 3 exists)