d2l-menu v2.3.3
d2l-menu
A Polymer-based web component for menus.
Installation
d2l-menu can be installed from Bower:
bower install d2l-menuUsage
Include the webcomponents.js "lite" polyfill (for browsers who don't natively support web components), then import the opener and content components as needed:
<head>
<script src="../webcomponentsjs/webcomponents-lite.js"></script>
</head>Menu
A basic menu can be defined using d2l-menu and a combination of d2l-menu-item and d2l-menu-item-link. Important: specify a label on your d2l-menu for screen-readers.
<d2l-menu label="Astronomy">
<d2l-menu-item text="Introduction"></d2l-menu-item>
<d2l-menu-item-separator></d2l-menu-item-separator>
<d2l-menu-item text="Searching the Heavens"></d2l-menu-item>
<d2l-menu-item text="The Solar System"></d2l-menu-item>
<d2l-menu-item text="Stars & Galaxies"></d2l-menu-item>
<d2l-menu-item text="The Night Sky"></d2l-menu-item>
<d2l-menu-item text="The Universe"></d2l-menu-item>
</d2l-menu>label- required to announce menu text with screen-readers
Note: d2l-menu renders without an outer border since it's typically used in a context where a containing element defines a border (ex. d2l-dropdown-menu or side nav).
Nested Menus
Nested menus can be defined by placing a d2l-menu inside a d2l-menu-item. For nested menus, a label attribute is automatically applied using the text attribute of the d2l-menu-item that contains it - no need to duplicate this value. A "return" menu item will be added to the top of the nested menu by default.
<d2l-menu label="Astronomy">
<d2l-menu-item text="Introduction"></d2l-menu-item>
<d2l-menu-item-separator></d2l-menu-item-separator>
<d2l-menu-item text="Searching the Heavens"></d2l-menu-item>
<d2l-menu-item text="The Solar System">
<d2l-menu>
<d2l-menu-item text="Formation"></d2l-menu-item>
<d2l-menu-item text="Modern Solar System"></d2l-menu-item>
<d2l-menu-item text="The Planets">
<d2l-menu>
<d2l-menu-item text="Mercury"></d2l-menu-item>
<d2l-menu-item text="Venus"></d2l-menu-item>
<d2l-menu-item text="Earth"></d2l-menu-item>
<d2l-menu-item text="Mars"></d2l-menu-item>
<d2l-menu-item text="..."></d2l-menu-item>
</d2l-menu>
</d2l-menu-item>
<d2l-menu-item text="The Sun"></d2l-menu-item>
<d2l-menu-item text="Asteroids"></d2l-menu-item>
<d2l-menu-item text="Comets"></d2l-menu-item>
</d2l-menu>
</d2l-menu-item>
<d2l-menu-item text="Stars & Galaxies">
<d2l-menu>
<d2l-menu-item text="What is a Star?"></d2l-menu-item>
<d2l-menu-item text="Lifecycle of a Star"></d2l-menu-item>
<d2l-menu-item text="Binaries & Multiples"></d2l-menu-item>
<d2l-menu-item text="Star Clusters"></d2l-menu-item>
<d2l-menu-item text="Star Death"></d2l-menu-item>
<d2l-menu-item text="Galaxies"></d2l-menu-item>
</d2l-menu>
</d2l-menu-item>
<d2l-menu-item text="The Night Sky"></d2l-menu-item>
</d2l-menu>Menu Items
By default, there are several menu item types provided. These include d2l-menu-item (for JS handlers), d2l-menu-item-link (for navigating), and d2l-menu-item-checkbox/d2l-menu-item-radio (for selection).
While navigation can be done in JS too, d2l-menu-item-link gives users the ability to right-click and open in a new tab. If providing a JS handler, wire-up to the d2l-menu-item-select event. In addition, a d2l-menu-item-separator can be used to semantically separate menu items.
<d2l-menu label="Astronomy">
<d2l-menu-item text="Introduction"></d2l-menu-item>
<d2l-menu-item text="The Planets"></d2l-menu-item>
<d2l-menu-item-separator></d2l-menu-item-separator>
<d2l-menu-item-link text="The Universe" href="https://en.wikipedia.org/wiki/Universe"></d2l-menu-item-link>
</d2l-menu>The selection menu items act as you would expect a checkbox or radio item to act. Multiple checkboxes in the same menu may be selected, but only one radio item in a given <d2l-menu> may be selected at once (i.e. selecting one option will deselect all the other d2l-menu-item-radio items).
<d2l-menu label="Some Options">
<d2l-menu-item-checkbox text="Option 1" value="1"></d2l-menu-item-checkbox>
<d2l-menu-item-checkbox text="Option 2" value="2"></d2l-menu-item-checkbox>
<d2l-menu-item-checkbox text="Option 3" value="3"></d2l-menu-item-checkbox>
</d2l-menu><d2l-menu label="Some Options">
<d2l-menu-item-radio text="Option 1" value="1" selected></d2l-menu-item-radio>
<d2l-menu-item-radio text="Option 2" value="2"></d2l-menu-item-radio>
<d2l-menu-item-radio text="Option 3" value="3"></d2l-menu-item-radio>
</d2l-menu>text- required ford2l-menu-itemhref- required ford2l-menu-item-linkvalue- required ford2l-menu-item-checkbox/d2l-menu-item-radioprevent-default- optional ford2l-menu-item-link- disables normal link behavior. This can help if you want both a JS handler and the browser's 'open in new tab' functionality (e.g. popup window links).selected- optional ford2l-menu-item-checkbox/d2l-menu-item-radio, this will set the item to be selected by default.
menu.addEventListener('d2l-menu-item-select', function(e) {
console.log('item selected:', e.target);
});Developing, Testing and Contributing
After cloning the repo, run npm install to install dependencies.
If you don't have it already, install the Polymer CLI globally:
npm install -g polymer-cliTo start a local web server that hosts the demo page and tests:
polymer serveTo lint (eslint and Polymer lint):
npm run lintTo run unit tests locally using Polymer test:
npm run test:polymer:localTo lint AND run local unit tests:
npm testVersioning
Commits and PR merges to master will automatically do a minor version bump which will:
- Update the version in
package.json - Add a tag matching the new version
- Create a github release matching the new version
By using either increment major or increment patch notation inside your merge message, you can overwrite the default version upgrade of minor to the position of your choice.
5 years ago