Element: <oj-conveyor-belt>

Oracle® JavaScript Extension Toolkit (JET)
8.0.0
F18189-01

Signature:

class ojConveyorBelt

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Attributes

Methods

JET Custom Elements

JET components are implemented as custom HTML elements. In addition to the component attributes documented in this page, JET components also support standard HTML global attributes like id and aria-label.

The JET data binding syntax can be used to define both component and global attributes through the use of dynamically evaluated expressions. All attributes (component and global) support attribute-level binding by prefixing the attribute name with ":" (e.g. :id="[...]"). When using attribute-level binding, all expression values are treated as strings. Additionally, component attributes support property-level binding by using the attribute name directly with no ":" prefix. When using property-level binding, the expressions should evaluate to the types documented by the corresponding attributes. Property-level binding is strongly recommended over attribute-level binding for component attributes.

A detailed description of working with custom HTML elements can be found in: JET Custom Element Usage.



Version:
  • 8.0.0
Since:
  • 0.6.0
Module:
  • ojconveyorbelt

Module usage

See JET Module Loading for an overview of module usage within JET.

Typescript Import Format
//To typecheck the element APIs, import as below.
import {ojConveyorBelt} from "ojs/ojconveyorbelt";

//For the transpiled javascript to load the element's module, import as below
import "ojs/ojconveyorbelt";

JET In Typescript

A detailed description of working with JET elements and classes in your typescript project can be found at: JET Typescript Usage.


JET ConveyorBelt

Description: Container element that manages overflow for its child elements and allows scrolling among them.

Child elements of the ConveyorBelt must all be siblings at the same level. The size of the ConveyorBelt must somehow be constrained in order for there to be overflow to manage, for example by specifying CSS max-width or max-height.

If the elements to be scrolled among are direct children of the ConveyorBelt, then ConveyorBelt will ensure that they are laid out appropriately for its orientation. However, if the elements to be scrolled among are contained by a single nested descendant element, the content-parent, then it is up to calling code to ensure that the elements are laid out appropriately. For example, elements can be forced horizontal by using CSS white-space:nowrap, or vertical by using display:block. 


<oj-conveyor-belt>
  <oj-button>Alpha</oj-button>
  <oj-button>Beta</oj-button>
  <oj-button>Gamma</oj-button>
  <oj-button>Delta</oj-button>
  <oj-button>Epsilon</oj-button>
  <oj-button>Zeta</oj-button>
</oj-conveyor-belt>

Touch End User Information

Target Gesture Action
ConveyorBelt Swipe Transition to an adjacent logical page of child items.
Navigation Arrow Tap Transition to an adjacent logical page of child items.

Keyboard End User Information

ConveyorBelt is for layout only and does not directly support keyboard interaction. It is up to the application to provide keyboard support.

Keyboard Application Developer Information

Providing keyboard support for the items in the conveyor belt is the responsibility of the application developer, if the items do not already support keyboard interaction. This could be done, for example, by specifying tabindex on each item to enable tab navigation. Alternatively, this could be done by adding a keyboard listener and responding to key events, like pressing the arrow keys.

Accessibility

ConveyorBelt itself does nothing special for accessibility. It is the responsibility of the application developer to make the items in the conveyor accessible. Sighted keyboard-only users need to be able to access the items in the conveyor just by using the keyboard. It is up to the child items of the ConveyorBelt to support keyboard navigation. If child items support tab navigation, the browser may scroll them into view when they receive focus. If child items support other forms of keyboard navigation, for example by using the arrow keys, it is up to the child items to scroll themselves into view. This may be done, for example, by calling the DOM function focus() or scrollIntoView() on the item. ConveyorBelt will be aware of tab based or programmatic scrolling and will honor it, updating itself to toggle visibility of the overflow indicators as needed.

Reading direction

As with any JET element, in the unusual case that the directionality (LTR or RTL) changes post-init, the conveyorBelt must be refresh()ed.

Note: Application logic should not interact with the component's properties or invoke its methods until the BusyContext indicates that the component is ready for interaction.

Slots

JET components that allow child content support slots. Please see the slots section of the JET component overview doc for more information on allowed slot content and slot types.

Default

The <oj-conveyor-belt> element manages overflow for its child elements and allows scrolling among them. Child elements of the <oj-conveyor-belt> must all be siblings at the same level.

If the elements to be scrolled among are nested descendants and not direct children of the conveyor belt, the content-parent attribute should specify the nested elements direct parent.

contextMenu

The contextMenu slot is set on the oj-menu within this element. This is used to designate the JET Menu that this component should launch as a context menu on right-click, Shift-F10, Press & Hold, or component-specific gesture. If specified, the browser's native context menu will be replaced by the JET Menu specified in this slot.

The application can register a listener for the Menu's ojBeforeOpen event. The listener can cancel the launch via event.preventDefault(), or it can customize the menu contents by editing the menu DOM directly, and then calling refresh() on the Menu.

To help determine whether it's appropriate to cancel the launch or customize the menu, the ojBeforeOpen listener can use component API's to determine which table cell, chart item, etc., is the target of the context menu. See the JSDoc of the individual components for details.

Keep in mind that any such logic must work whether the context menu was launched via right-click, Shift-F10, Press & Hold, or component-specific touch gesture.

Attributes

(nullable) content-parent :string

Specify the selector of the descendant DOM element in the conveyorBelt that directly contains the items to scroll among.

This attribute value is null by default, meaning that the items to scroll among are direct children of the oj-conveyor-belt. In some cases, the items to scroll among are not direct children of the oj-conveyor-belt, but are instead nested in a descendant DOM element. In such cases, this attribute should be specified to point to the descendant DOM element whose direct children are the items to scroll among. For example, if the items to scroll among are buttons in a buttonset, the buttons are direct children of the DOM element representing the buttonset. The buttonset would be the direct child of the conveyorBelt. If the id of the buttonset DOM element were 'myContentElem', then content-parent would be specified as '#myContentElem'.

WARNING: The selector specified for this attribute should match only a single descendant DOM element. If multiple elements are matched, then only the first one will be used. Applications should not depend on this behavior because we reserve the right to change it in the future in order to allow and use multiple matching elements.

Default Value:
  • null
Names
Item Name
Property contentParent
Property change event contentParentChanged
Property change listener attribute (must be of type function, see Events and Listeners for additional information.) on-content-parent-changed

orientation :"horizontal"|"vertical"

Specify the orientation of the conveyorBelt.
Supported Values:
Value Description
"horizontal" Orient the conveyorBelt horizontally.
"vertical" Orient the conveyorBelt vertically.
Default Value:
  • "horizontal"
Names
Item Name
Property orientation
Property change event orientationChanged
Property change listener attribute (must be of type function, see Events and Listeners for additional information.) on-orientation-changed

translations :object|null

A collection of translated resources from the translation bundle, or null if this component has no resources. Resources may be accessed and overridden individually or collectively, as seen in the examples.

If the component does not contain any translatable resource, the default value of this attribute will be null. If not, an object containing all resources relevant to the component.

If this component has translations, their documentation immediately follows this doc entry.

Names
Item Name
Property translations
Property change event translationsChanged
Property change listener attribute (must be of type function, see Events and Listeners for additional information.) on-translations-changed

Methods

getProperty(property) : {any}

Retrieves the value of a property or a subproperty. The return type will be the same as the type of the property as specified in this API document. If the method is invoked with an incorrect property/subproperty name, it returns undefined.
Parameters:
Name Type Description
property string The property name to get. Supports dot notation for subproperty access.
Since:
  • 4.0.0
Returns:
Type
any
Example

Get a single subproperty of a complex property:

let subpropValue = myComponent.getProperty('complexProperty.subProperty1.subProperty2');

refresh() : {void}

Refreshes the visual state of the conveyorBelt. JET elements require a refresh() after the DOM is programmatically changed underneath the element.

This method does not accept any arguments.

Returns:
Type
void

setProperties(properties) : {void}

Performs a batch set of properties. The type of value for each property being set must match the type of the property as specified in this API document.
Parameters:
Name Type Description
properties Object An object containing the property and value pairs to set.
Since:
  • 4.0.0
Returns:
Type
void
Example

Set a batch of properties:

myComponent.setProperties({"prop1": "value1", "prop2.subprop": "value2", "prop3": "value3"});

setProperty(property, value) : {void}

Sets a property or a subproperty (of a complex property) and notifies the component of the change, triggering a [property]Changed event. The value should be of the same type as the type of the attribute mentioned in this API document.
Parameters:
Name Type Description
property string The property name to set. Supports dot notation for subproperty access.
value any The new value to set the property to.
Since:
  • 4.0.0
Returns:
Type
void
Example

Set a single subproperty of a complex property:

myComponent.setProperty('complexProperty.subProperty1.subProperty2', "someValue");