Name	Name	Last commit message	Last commit date
parent directory ..
demo	demo
test	test
README.md	README.md
list-controls.js	list-controls.js
list-item-button-mixin.js	list-item-button-mixin.js
list-item-button.js	list-item-button.js
list-item-checkbox-mixin.js	list-item-checkbox-mixin.js
list-item-content.js	list-item-content.js
list-item-drag-drop-mixin.js	list-item-drag-drop-mixin.js
list-item-drag-handle.js	list-item-drag-handle.js
list-item-drag-image.js	list-item-drag-image.js
list-item-expand-collapse-mixin.js	list-item-expand-collapse-mixin.js
list-item-generic-layout.js	list-item-generic-layout.js
list-item-link-mixin.js	list-item-link-mixin.js
list-item-mixin.js	list-item-mixin.js
list-item-placement-marker.js	list-item-placement-marker.js
list-item-role-mixin.js	list-item-role-mixin.js
list-item.js	list-item.js
list.js	list.js

Lists

A list displays a collection of objects of the same type. A list is primarily used in order to help users navigate to a full-page representation of a single object, or to select several items and execute an action on them.

<script type="module">
  import '@brightspace-ui/core/components/dropdown/dropdown-menu.js';
  import '@brightspace-ui/core/components/dropdown/dropdown-more.js';
  import '@brightspace-ui/core/components/list/list.js';
  import '@brightspace-ui/core/components/list/list-item.js';
  import '@brightspace-ui/core/components/list/list-item-content.js';
  import '@brightspace-ui/core/components/menu/menu.js';
  import '@brightspace-ui/core/components/menu/menu-item.js';
</script>

<d2l-list>
  <d2l-list-item label="List Item 1">
    <d2l-list-item-content>
      <div>Regular list item</div>
      <div slot="secondary">Secondary information</div>
    </d2l-list-item-content>
  </d2l-list-item>
  <d2l-list-item href="http://www.d2l.com" key="1" label="List Item 2">
    <img slot="illustration" src="https://s.brightspace.com/course-images/images/38e839b1-37fa-470c-8830-b189ce4ae134/tile-high-density-max-size.jpg" />
    <d2l-list-item-content>
      <div>More exciting list item</div>
      <div slot="supporting-info">Supporting information</div>
    </d2l-list-item-content>
    <div slot="actions">
      <d2l-dropdown-more text="Open">
        <d2l-dropdown-menu>
          <d2l-menu label="Menu">
            <d2l-menu-item text="Action 1"></d2l-menu-item>
            <d2l-menu-item text="Action 2"></d2l-menu-item>
          </d2l-menu>
        </d2l-dropdown-menu>
      </d2l-dropdown-more>
    </div>
  </d2l-list-item>
  <d2l-list-item href="http://www.d2l.com" selectable key="2" selected label="List Item 3">
    <img slot="illustration" src="https://s.brightspace.com/course-images/images/63b162ab-b582-4bf9-8c1d-1dad04714121/tile-high-density-max-size.jpg">
    <d2l-list-item-content>
      <div>Selectable list item (selected)</div>
      <div slot="supporting-info">Supporting information</div>
    </d2l-list-item-content>
  </d2l-list-item>
</d2l-list>

Best Practices

Lists are good when items may have different attributes, and if presented in a table would have many empty cells in the columns
Tables take up a lot of horizontal space, and don’t really have responsive behaviour other than offscreen scroll
Tables have fixed width columns – every column’s size is driven by the largest element. If the contents of a certain “column” are highly variable, consider a list
Generally, the larger touch target of the list is easier to use than needing to target a link in the first column of a table, if the primary use case is navigation & selection rather than analysis, consider a list

If your data is highly numerical, or a complex dataset, and making comparisons across column is essential to the user’s workflow, consider a table
If the user is expected to frequently change the sorting order, the sortable column headers of tables speed up this process
Lists don’t have headings, so for views where additional information would otherwise be repeated in every individual item, consider a table

Accessibility

If your list items are selectable or have secondary action buttons, use the ARIA layout grid on d2l-list to make it easy to navigate between items. This makes the entire list a single tab stop, and then the user can use the arrow keys to navigate between various list rows and actions in the list item.

Benefits of the ARIA layout grid:

Specifying the list as a single tab stop using the ARIA layout grid allows the user to navigate from selecting items to applying actions on their selection with a single tab
The layout grid allows the user to arrow “down” the column of checkboxes (or action buttons) without all the extra tab stops in-between

Guidelines of specifying the ARIA layout Grid:

The item selection manipulators should be in a single pseudo-column
All list item content for a list item should reside in a single pseudo-column
Each Secondary Action Button should reside in it’s own pseudo-column
Do not use the ARIA layout grid if there are multiple links or navigation actions in the list item content

Implementation Details:

When using d2l-list, the grid attribute will enable the table-like keyboard grid that allows a user to traverse list items with their keyboard. Left and right will switch if using an RTL language.

ArrowLeft moves to the next left item in a row
ArrowRight moves to the next right item in a row
ArrowUp moves to the same item in the row above, if available
ArrowDown moves to the same item in the row below, if available
PageUp moves to the same item in the row five rows above, if available
PageDown moves to the same item in the row five rows below, if available
Home moves to the first item in the row
Ctrl+Home moves to the first item of the first row
End moves to the last item in the row
Ctrl+End moves to the last item of the last row
Space and Enter simulate a click on the focused item

Note about actions: Actions must be placed in the actions slot. The grid does not support actions/focusable items that are placed in the content area. The list item currently only supports navigation with href as the content action.

List [d2l-list]

The d2l-list is the container to create a styled list of items using d2l-list-item or d2l-list-item-button. It provides the appropriate list semantics as well as options for displaying separators, breakpoints for responsiveness, etc.

<script type="module">
  import '@brightspace-ui/core/components/list/list.js';
  import '@brightspace-ui/core/components/list/list-item.js';
  import '@brightspace-ui/core/components/list/list-item-content.js';
</script>

<d2l-list>
  <d2l-list-item selectable label="List Item 1">
    <d2l-list-item-content>
      <div>Regular list item</div>
      <div slot="secondary">Secondary information</div>
      <div slot="supporting-info">Supporting information</div>
    </d2l-list-item-content>
  </d2l-list-item>
  <d2l-list-item selectable label="List Item 2">
    <d2l-list-item-content>
      <div>Regular list item 2</div>
      <div slot="secondary">Secondary information</div>
      <div slot="supporting-info">Supporting information</div>
    </d2l-list-item-content>
  </d2l-list-item>
</d2l-list>

Properties

Property	Type	Description
`breakpoints`	Array	Breakpoints for responsiveness in pixels. There are four different breakpoints and only the four largest breakpoints will be used.
`drag-multiple`	Boolean	Whether the user can drag multiple items
`grid`	Boolean	Enables keyboard grid for supported list items. See Accessibility.
`label`	String	Sets an accessible label. For use when the list context is unclear. This property is only valid on top-level lists and will have no effect on nested lists.
`selection-single`	Boolean	Whether to render with single selection behaviour. If `selection-single` is specified, the list-items will render with radios instead of checkboxes, and the list component will maintain a single selected item.
`separators`	String	Display separators (`all` (default), `between`, `none`)
`extend-separators`	Boolean	Whether to extend the separators beyond the content's edge

Events

d2l-list-selection-change: dispatched when the selection state changes; event detail includes the key and selected state of the item
d2l-list-selection-changes: dispatched once for a set of selection state changes (ex. select-all); event detail includes an array of objects where each object contains the key and selected state for each changed item

Breakpoints Property

breakpoints (Array): Breakpoints for responsiveness ([842, 636, 580, 0]), in pixels. There are four different breakpoints and only the four largest breakpoints will be used. If less breakpoints are used, then skip a middle breakpoint so that the first and last breakpoints will map to the largest and smallest layouts.
- Breakpoint 0
  - Image: max dimensions: width: 90px and height: 52px and has 18px margin from the main content;
  - default break: x < 580px where x is the width of the component.
- Breakpoint 1
  - Image: max dimensions: width: 120px and height: 71px and has 20px margin from the main content;
  - default break: 581px < x < 636px where x is the width of the component.
- Breakpoint 2
  - Image: max dimensions: width: 180px and height: 102px and has 20px margin from the main content;
  - default break: 637px < x < 842px where x is the width of the component.
- Breakpoint 3
  - Image: max dimensions: width: 216px and height: 120px and has 20px margin from the main content;
  - default break: 843px < x where x is the width of the component.

add-button Property

The add-button attribute inserts the d2l-button-add component above and below each item in a list. Each nested list that wants to have this functionality will need to have this attribute on the nested d2l-list as well. Each list item needs to have its own key in order to communicate where a new item should be positioned.

Adding new items to the list is handled entirely by consumers by listening for the d2l-list-add-button-click event. A simple example scenario is below.

<script type="module">
  import '@brightspace-ui/core/components/list/list.js';
  import '@brightspace-ui/core/components/list/list-controls.js';
  import '@brightspace-ui/core/components/list/list-item.js';
  import '@brightspace-ui/core/components/list/list-item-content.js';
  import '@brightspace-ui/core/components/selection/selection-action.js';
  import { css, html, LitElement } from 'lit';
  import { getUniqueId } from '@brightspace-ui/core/helpers/uniqueId.js';

  class ListDemoAddButton extends LitElement {

    _handleListAddButtonClick(e) {
      const newItem = this._newItem();
      const siblingItem = this.shadowRoot.querySelector(`[key="${e.detail.key}"]`);

      if (e.detail.position === 'before') {
        siblingItem.insertAdjacentElement('beforebegin', newItem);
      } else {
        siblingItem.insertAdjacentElement('afterend', newItem);
      }
    }

    _newItem() {
      const elem = document.createElement('d2l-list-item');
      const key = getUniqueId();
      elem.key = key;
      elem.label = 'New Item';
      elem.selectable = true;

      const childElem = document.createElement('d2l-list-item-content');
      childElem.textContent = `Item ${key}`;

      elem.appendChild(childElem);
      return elem;
    }

    render() {
      return html`
        <d2l-list grid add-button @d2l-list-add-button-click="${this._handleListAddButtonClick}">
          <d2l-list-controls slot="controls">
            <d2l-selection-action icon="tier1:delete" text="Delete" requires-selection></d2l-selection-action>
          </d2l-list-controls>
          <d2l-list-item selectable expandable key="expand-1" label="Expandable item #1">
            <d2l-list-item-content>
              <div>Expandable item #1</div>
              <div slot="supporting-info">Supporting information</div>
            </d2l-list-item-content>
            <d2l-list grid add-button slot="nested" @d2l-list-add-button-click="${this._handleListAddButtonClick}">
              <d2l-list-item selectable key="nested-1" label="Nested 1">
                <d2l-list-item-content><div>Nested item #1</div></d2l-list-item-content>
              </d2l-list-item>
              <d2l-list-item selectable key="nested-2" label="Nested 2">
                <d2l-list-item-content><div>Nested item #2</div></d2l-list-item-content>
              </d2l-list-item>
            </d2l-list>
          </d2l-list-item>
          <d2l-list-item selectable expandable expanded key="expand-2" label="Expandable item #2">
            <d2l-list-item-content>
              <div>Expandable Item #2</div>
              <div slot="supporting-info">Supporting information</div>
            </d2l-list-item-content>
            <d2l-list grid add-button slot="nested" @d2l-list-add-button-click="${this._handleListAddButtonClick}">
              <d2l-list-item selectable key="nested-3" label="Nested 3">
                <d2l-list-item-content><div>Nested item #3</div></d2l-list-item-content>
              </d2l-list-item>
              <d2l-list-item selectable key="nested-4" label="Nested 4">
                <d2l-list-item-content><div>Nested item #4</div></d2l-list-item-content>
              </d2l-list-item>
            </d2l-list>
          </d2l-list-item>
          <d2l-list-item selectable key="expand-3" label="Item with no children">
            <d2l-list-item-content>
              <div>Item with no children</div>
              <div slot="supporting-info">Supporting information</div>
            </d2l-list-item-content>
          </d2l-list-item>
        </d2l-list>
      `;
    }
  }
  customElements.define('d2l-list-demo-add-button', ListDemoAddButton);
</script>
<d2l-list-demo-add-button></d2l-list-demo-add-button>

Methods

getItems() (Array): returns the list items within the list
getListItemByKey(key) (ListItem): returns the list item element from the root or nested lists for the specified key
getListItemCount() (Number): returns the number of items within the list
getListItemIndex(item) (Object): returns the index of the given element within the list
getSelectedListItems(includeNested) (Array): returns the selected items; pass true to include nested lists
getSelectionInfo(includeNested) (Object): returns a SelectionInfo object containing the state (none, some, all), and the keys (Array) for the selected items

Selection Lists

The d2l-list supports selectable items within a list, including both single and multi selection. Selection is enabled when d2l-list-items have the selectable attribute. When items are selectable, multiple selection is the default behaviour, however the selection-single attribute can be applied to the d2l-list to enable single selection. A d2l-list-controls component can be added to d2l-list's controls slot to provide select-all and bulk actions.

Accessibility Properties

If a d2l-list-item is selectable then it should have a label attribute that corresponds to the hidden label for the checkbox.

Example

<script type="module">
  import '@brightspace-ui/core/components/list/list.js';
  import '@brightspace-ui/core/components/list/list-controls.js';
  import '@brightspace-ui/core/components/list/list-item.js';
  import '@brightspace-ui/core/components/list/list-item-content.js';
  import '@brightspace-ui/core/components/selection/selection-action.js';
</script>

<d2l-list>
  <d2l-list-controls slot="controls" no-sticky>
    <d2l-selection-action icon="tier1:delete" text="Delete" requires-selection></d2l-selection-action>
  </d2l-list-controls>
  <d2l-list-item selectable key="eth" label="Earth Sciences">
    <d2l-list-item-content>
      <div>Earth Sciences</div>
      <div slot="supporting-info">Supporting information</div>
    </d2l-list-item-content>
  </d2l-list-item>
  <d2l-list-item selectable key="ast" label="Astronomy">
    <d2l-list-item-content>
      <div>Astronomy</div>
      <div slot="supporting-info">Supporting information</div>
    </d2l-list-item-content>
  </d2l-list-item>
</d2l-list>

Expandable Lists

The d2l-list supports expandable items within a list. Expand and collapse toggle is enabled when d2l-list-items have the expandable and key attributes set. When items are expandable the default state is collapsed. If you would like the default state to be expanded, add the expanded attribute to the d2l-list-item.

Expandable List Accessibility Properties

If a d2l-list-item is expandable then it should have a label attribute that corresponds to the hidden label for the expand/collapse toggle.

Expandable List Example

<script type="module">
  import '@brightspace-ui/core/components/list/list.js';
  import '@brightspace-ui/core/components/list/list-controls.js';
  import '@brightspace-ui/core/components/list/list-item.js';
  import '@brightspace-ui/core/components/list/list-item-content.js';
  import '@brightspace-ui/core/components/selection/selection-action.js';
</script>

<d2l-list grid>
  <d2l-list-controls slot="controls">
    <d2l-selection-action icon="tier1:delete" text="Delete" requires-selection></d2l-selection-action>
  </d2l-list-controls>
  <d2l-list-item selectable expandable key="expand-1" label="Expandable item #1">
    <d2l-list-item-content>
      <div>Expandable item #1</div>
      <div slot="supporting-info">Supporting information</div>
    </d2l-list-item-content>
    <d2l-list grid slot="nested">
      <d2l-list-item selectable key="nested-1" label="Nested 1">
        <d2l-list-item-content><div>Nested item #1</div></d2l-list-item-content>
      </d2l-list-item>
      <d2l-list-item selectable key="nested-2" label="Nested 2">
        <d2l-list-item-content><div>Nested item #2</div></d2l-list-item-content>
      </d2l-list-item>
    </d2l-list>
  </d2l-list-item>
  <d2l-list-item selectable expandable expanded key="expand-2" label="Expandable item #2">
    <d2l-list-item-content>
      <div>Expandable Item #2</div>
      <div slot="supporting-info">Supporting information</div>
    </d2l-list-item-content>
    <d2l-list grid slot="nested">
      <d2l-list-item selectable key="nested-3" label="Nested 3">
        <d2l-list-item-content><div>Nested item #3</div></d2l-list-item-content>
      </d2l-list-item>
      <d2l-list-item selectable key="nested-4" label="Nested 4">
        <d2l-list-item-content><div>Nested item #4</div></d2l-list-item-content>
      </d2l-list-item>
    </d2l-list>
  </d2l-list-item>
  <d2l-list-item selectable key="expand-3" label="Item with no children">
    <d2l-list-item-content>
      <div>Item with no children</div>
      <div slot="supporting-info">Supporting information</div>
    </d2l-list-item-content>
  </d2l-list-item>
</d2l-list>

Pageable Lists

Load-More paging functionality can be implemented in lists by placing a d2l-pager-load-more in d2l-list's pager slot. The consumer must handle the d2l-pager-load-more event by loading more items, updating the pager state, and signalling completion by calling complete() on the event detail. Focus will be automatically moved on the first new item once complete. See Paging for more details.

Drag & Drop Lists

The d2l-list supports drag & drop.

The d2l-list is simply a rendering component, so there is some light work involved in hooking up this behaviour. In order for items to be draggable, they must have their draggable and key attributes set. Optionally, the drop-nested attribute can be applied to items to indicate whether other items can be dropped as nested children on the item.

Reordering and re-rendering is the consuming component's responsibility. For a simple flat list, listen for the d2l-list-item-position-change event and call the reorder helper method. Alternatively, or for more complex lists such as those with nested lists, listen for the d2l-list-items-move event on the root list and update the consumer data using the provided source and target event detail.

Accessibility Properties

If an item is draggable, the drag-handle-text attribute should be used to provide an accessible label for assistive technology in keyboard mode.

Example

<script type="module">
  import '@brightspace-ui/core/components/list/list.js';
  import '@brightspace-ui/core/components/list/list-item.js';
  import '@brightspace-ui/core/components/list/list-item-content.js';
  import { css, html, LitElement } from 'lit';

  class ListDemoDragAndDropUsage extends LitElement {
    static get properties() {
      return {
        list: { type: Array }
      };
    }

    constructor() {
      super();
      this.list = [
        { key: '1', content: 'Initially first list item' },
        { key: '2', content: 'Initially second list item' },
        { key: '3', content: 'Initially third list item' }
      ];
    }

    render() {
      const listItems = this.list.map((item) => {
        return html`
          <d2l-list-item draggable key="${item.key}" label="Draggable List Item">
            <d2l-list-item-content>
              ${item.content}
              <div slot="secondary">Secondary information</div>
            </d2l-list-item-content>
          </d2l-list-item>
        `;
      });

      return html`
        <d2l-list @d2l-list-item-position-change="${this._moveItems}">
          ${listItems}
        </d2l-list>
      `;
    }

    _moveItems(e) {
      e.detail.reorder(this.list, { keyFn: (item) => item.key });
      this.requestUpdate('list', []);
    }
  }
  customElements.define('d2l-my-drag-drop-elem', ListDemoDragAndDropUsage);
</script>
<d2l-my-drag-drop-elem></d2l-my-drag-drop-elem>

List Controls [d2l-list-controls]

The d2l-list-controls component can be placed in the d2l-list's controls slot to provide a select-all checkbox, summary, a slot for d2l-selection-actions, and overflow-group behaviour.

<script type="module">
  import '@brightspace-ui/core/components/list/list.js';
  import '@brightspace-ui/core/components/list/list-controls.js';
  import '@brightspace-ui/core/components/list/list-item.js';
  import '@brightspace-ui/core/components/list/list-item-content.js';
  import '@brightspace-ui/core/components/selection/selection-action.js';
</script>
<!-- docs: start hidden content -->
<style>
  #demo-element {
    margin-bottom: 300px;
    margin-top: 0;
  }
</style>
<!-- docs: end hidden content -->

<d2l-list>
  <d2l-list-controls slot="controls">
    <d2l-selection-action icon="tier1:delete" text="Delete" requires-selection></d2l-selection-action>
    <d2l-selection-action icon="tier1:gear" text="Settings"></d2l-selection-action>
  </d2l-list-controls>
  <d2l-list-item selectable key="eth" label="Earth Sciences">
    <d2l-list-item-content>
      <div>Earth Sciences</div>
      <div slot="supporting-info">Supporting information</div>
    </d2l-list-item-content>
  </d2l-list-item>
  <d2l-list-item selectable key="ast" label="Astronomy">
    <d2l-list-item-content>
      <div>Astronomy</div>
      <div slot="supporting-info">Supporting information</div>
    </d2l-list-item-content>
  </d2l-list-item>
</d2l-list>

Properties

Property	Type	Description
`no-selection`	Boolean	Whether to render select-all and selection summary
`no-sticky`	Boolean	Disables sticky positioning for the controls
`select-all-pages-allowed`	Boolean	Whether all pages can be selected

List Item [d2l-list-item]

The d2l-list-item provides the appropriate listitem semantics for children within a list. It also provides some basic layout, a navigation link for the primary action, and selection.

<script type="module">
  import '@brightspace-ui/core/components/button/button-icon.js';
  import '@brightspace-ui/core/components/list/list.js';
  import '@brightspace-ui/core/components/list/list-item.js';
  import '@brightspace-ui/core/components/list/list-item-content.js';
</script>

<d2l-list>
  <d2l-list-item href="http://www.d2l.com" selectable key="3" label="Geomorphology and GIS">
    <img slot="illustration" src="https://s.brightspace.com/course-images/images/63b162ab-b582-4bf9-8c1d-1dad04714121/tile-high-density-max-size.jpg" />
    <d2l-list-item-content>
      <div>Geomorphology and GIS </div>
      <div slot="supporting-info">This course explores the geological processes of the Earth's interior and surface. These include volcanism, earthquakes, mountain...</div>
    </d2l-list-item-content>
    <div slot="actions">
      <d2l-button-icon text="My Button" icon="tier1:preview"></d2l-button-icon>
    </div>
  </d2l-list-item>
</d2l-list>

Properties

Property	Type	Description
`draggable`	Boolean	Whether the item is draggable
`drag-handle-text`	String	The drag-handle label for assistive technology. If implementing drag & drop, you should change this to dynamically announce what the drag-handle is moving for assistive technology in keyboard mode.
`drag-target-handle-only`	Boolean	Make the drag target the drag handle only.
`drop-nested`	Boolean	Whether nested items can be dropped on this item
`drop-text`	String	Text to drag and drop
`expandable`	Boolean	Whether or not to show the expand/collapse toggle.
`expanded`	Boolean	Whether the item is expanded. Requires `expandable` to be set.
`href`	String	Address of item link if navigable
`key`	String	Value to identify item if selectable or draggable
`label`	String	Explicitly defined label for the element
`labelled-by`	String	The id of element that provides the label for this element
`no-primary-action`	Boolean	Whether to disable rendering the entire item as the primary action. Required if slotted content is interactive.
`padding-type`	String	List item whitespace (`normal` (default), `none`)
`selectable`	Boolean	Indicates an input should be rendered for selecting the item
`selected`	Boolean	Whether the item is selected
`selection-disabled`	Boolean	Disables selection
`skeleton`	Boolean	Renders the input as a skeleton loader

Methods

highlight(): highlights the item
scrollToItem(alignToTop=true): scrolls to the item. See Element.scrollIntoView for definition of alignToTop.
scrollToAndHighlight(alignToTop=true): scrolls to the item and then highlights it. . See Element.scrollIntoView for definition of alignToTop.

Events

d2l-list-item-link-click: dispatched when the item's primary link action is clicked
d2l-list-item-expand-collapse-toggled: dispatched when the item's expand/collapse toggle is clicked

Button List Item [d2l-list-item-button]

The d2l-list-item-button provides the same functionality as d2l-list-item except with button semantics for its primary action.

<script type="module">
  import '@brightspace-ui/core/components/list/list.js';
  import '@brightspace-ui/core/components/list/list-item-button.js';
  import '@brightspace-ui/core/components/list/list-item-content.js';
</script>

<d2l-list>
  <d2l-list-item-button href="http://www.d2l.com" selectable key="1" label="Geomorphology and GIS">
    <d2l-list-item-content>
      <div>Geomorphology and GIS </div>
      <div slot="supporting-info">This course explores the geological processes of the Earth's interior and surface. These include volcanism, earthquakes, mountain...</div>
    </d2l-list-item-content>
  </d2l-list-item-button>
</d2l-list>

Properties

Property	Type	Description
`button-disabled`	Boolean	Disables the primary action button
`draggable`	Boolean	Whether the item is draggable
`drag-handle-text`	String	The drag-handle label for assistive technology. If implementing drag & drop, you should change this to dynamically announce what the drag-handle is moving for assistive technology in keyboard mode.
`drop-nested`	Boolean	Whether nested items can be dropped on this item
`drop-text`	String	Text to drag and drop
`expandable`	Boolean	Whether or not to show the expand/collapse toggle.
`expanded`	Boolean	Whether the item is expanded. Requires `expandable` to be set.
`key`	String	Value to identify item if selectable or draggable
`label`	String	Explicitly defined label for the element
`labelled-by`	String	The id of element that provides the label for this element
`padding-type`	String	List item whitespace (`normal` (default), `none`)
`selectable`	Boolean	Indicates an input should be rendered for selecting the item
`selected`	Boolean	Whether the item is selected
`selection-disabled`	Boolean	Disables selection
`skeleton`	Boolean	Renders the input as a skeleton loader

Events

d2l-list-item-button-click: dispatched when the item's primary button action is clicked
d2l-list-item-expand-collapse-toggled: dispatched when the item's expand/collapse toggle is clicked

ListItemMixin

Want to maintain consistency with d2l-list-item but need more modularity? This mixin is for you! This mixin allows you to make a component into a list item without requiring custom styling. All of the properties and functionality from d2l-list-item (listed above) will be added to your new component.

How to use

Import

import { ListItemMixin } from './list-item-mixin.js';

class ListItem extends ListItemMixin(LitElement) {
...

How add the styles:

static get styles() {
  return [ super.styles ];
}

How to render the list item:

render() {
  return this._renderListItem({
    illustration: html`[Image HTML here]`,
    content: html`[Content here such as d2l-list-item-content]`,
    actions: html`actions here`
  });
}

Where the parameters correspond to the slots of d2l-list-item:

illustration (TemplateResult): Provide an illustration for your list item.
content (TemplateResult): Core content of the list item, such as a d2l-list-item-content element.
actions (TemplateResult): Secondary actions for the list item.
nested (TemplateResult): Optional d2l-list for a nested list.

List Item Content

The d2l-list-item-content provides additional consistent layout for primary and secondary text in item content. It may be used with or without the illustration and action slots mentioned above.

<script type="module">
  import '@brightspace-ui/core/components/list/list.js';
  import '@brightspace-ui/core/components/list/list-item.js';
  import '@brightspace-ui/core/components/list/list-item-content.js';
</script>

<d2l-list>
  <d2l-list-item label="List Item 1">
    <d2l-list-item-content>
      <div>Item 1</div>
      <div slot="secondary">Secondary Info for item 1</div>
      <div slot="supporting-info">Supporting info for item 1</div>
    </d2l-list-item-content>
  </d2l-list-item>
</d2l-list>

Event Details: @d2l-list-item-position-change

This event includes a detail object with helper methods attached to it.

Methods

announceMove(list, {announceFn, keyFn}): Announces a move event to screenreaders
- list: The array of items
- announceFn(any, Number): A callback function that takes a given item in the array and its index, and returns the text to announce
- keyFn(any): A callback function that takes a given item in the array and returns its key
fetchPosition(list, key, keyFn):
- list: The array of items
- key: The key of the item to fetch the position of
- keyFn(any): A callback function that takes a given item in the array and returns its key
reorder(list, {announceFn, keyFn}): Reorders an array of items in-place using the information from the event
- list: The array of items
- announceFn(any, Number) (optional): A callback function that takes a given item in the array and its index, and returns the text to announce
- keyFn(any): A callback function that takes a given item in the array and returns its key

Event Details: @d2l-list-items-move

Properties

keyboardActive: (Boolean) Whether the drag handle is in keyboard mode
sourceItems: (Array) Items being moved
target: (Object) The target reference item where items are being moved, and the location (moveLocations.above, moveLocations.below, or moveLocations.nest)

Future Improvements

Paging: integration with "scroll" and "numeric" paging mechanisms

Looking for an enhancement not listed here? Create a GitHub issue!

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