makeup-navigation-emitter

makeup-navigation-emitter

A vanilla JavaScript port of jquery-linear-navigation.

Emits custom events based on keyboard navigation of one or two dimensional model.

Experimental

This module is still in an experimental state, until it reaches v1.0.0 you must consider all minor releases as breaking changes. Patch releases may introduce new features, but will be backwards compatible.

Install

// via npm
npm install makeup-navigation-emitter

// via yarn
yarn add makeup-navigation-emitter

Example 1

Example support for a roving tabindex model of keyboard navigation.

Note that this module will not change focus, that is the job of an observer such as makeup-roving-tabindex.

<div class="widget">
    <ul>
        <li tabindex="0">Item 0</li>
        <li>Item 1</li>
        <li>Item 2</li>
    </ul>
</div>

const NavigationEmitter = require('makeup-navigation-emitter');

const widgetEl = document.querySelector('.widget');

var emitter = NavigationEmitter.createLinear(widgetEl, 'li'));

widgetEl.addEventListener('navigationModelChange', function(e) {
    console.log(e.detail.fromIndex, e.detail.toIndex);
});

Example 2

Example support for an active descendant model of navigation with focus on ancestor of items.

Note that this module will not highlight the active item, that is the job of an observer such as makeup-active-descendant.

<div class="widget" tabindex="0">
    <ul>
        <li>Item 0</li>
        <li>Item 1</li>
        <li>Item 2</li>
    </ul>
</div>

const NavigationEmitter = require('makeup-navigation-emitter');

const widgetEl = document.querySelector('.widget');

var emitter = NavigationEmitter.createLinear(widgetEl, 'li', { autoInit: -1, autoReset: -1 }));

widgetEl.addEventListener('navigationModelChange', function(e) {
    console.log(e.detail.fromIndex, e.detail.toIndex);
});

Example 3

Example support for an active descendant model of navigation with focus on non-ancestor of items.

Note that this module will not highlight the active item, that is the job of an observer such as makeup-active-descendant.

<div class="widget">
    <input type="text" />
    <ul>
        <li>Item 0</li>
        <li>Item 1</li>
        <li>Item 2</li>
    </ul>
</div>

const NavigationEmitter = require('makeup-navigation-emitter');

const widgetEl = document.querySelector('.widget');

var emitter = NavigationEmitter.createLinear(widgetEl, 'li', { autoInit: -1, autoReset: -1 }));

widgetEl.addEventListener('navigationModelChange', function(e) {
    console.log(e.detail.fromIndex, e.detail.toIndex);
});

Options

• autoInit: specify an integer or -1 for initial index (default: 0)
• autoReset: specify an integer or -1 for index position when focus exits widget (default: null)
• wrap : specify whether arrow keys should wrap/loop (default: false)
• axis : specify 'x' for left/right arrow keys, 'y' for up/down arrow keys, or 'both' (default: 'both')

Methods

• destroy: destroys all event listeners
• reset: will force a reset to the value specified by autoReset

Events

• navigationModelInit - fired when the model is auto initialised
• navigationModelChange - fired when the index is set by any means other than auto init or auto reset
• navigationModelReset - fired when the model is auto reset

For all 3 events, the event detail object contains the fromIndex and toIndex.

Dependencies

• https://github.com/makeup-js/makeup-exit-emitter
• https://github.com/makeup-js/makeup-key-emitter

Requirements

• CustomEvent polyfill for IE11 (included if bundling with Lasso)
• NodeList.forEach polyfill for IE11 (included if bundling with Lasso)

Development

• npm start
• npm test
• npm run lint
• npm run fix
• npm run build
• npm run clean

The following hooks exist, and do not need to be invoked manually:

• npm prepublishOnly cleans, lints, tests and builds on every npm publish command
• pre-commit cleans, lints, tests and builds on every git commit command

Test Reports

Each test run will generate the following reports:

• /reports/coverage contains Istanbul code coverage report
• /reports/html contains HTML test report

CI Build

https://travis-ci.org/makeup-js/makeup-navigation-emitter

Code Coverage

https://coveralls.io/github/makeup-js/makeup-navigation-emitter