Galleria
Galleria is an advanced content gallery component.
Galleria requires a value as a collection of images, item template for the higher resolution image and thumbnail template to display as a thumbnail.
Usage #
Examples #
Basic #
Galleria requires a value as a collection of images, item template for the higher resolution image and thumbnail template to display as a thumbnail.
Controlled #
Galleria can be controlled programmatically using the activeIndex property.
Indicator #
Click Event #
Indicators are displayed at the bottom by enabling showIndicators property and interacted with the click event by default.
Hover Event #
Indicators can be activated on hover instead of click if changeItemOnIndicatorHover is added.
Position #
Indicators can be placed at four different sides using the indicatorsPosition property. In addition, enabling showIndicatorsOnItem moves the indicators inside the image section. indicatorsPosition set to bottom by default, accepted values are top, left, right, and bottom.
Template #
Indicator content can be customized with the indicator template.
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Thumbnail #
Galleria can be controlled programmatically using the activeIndex property.
Responsive #
Galleria responsiveness is defined with the responsiveOptions property.
Full Screen #
With Thumbnails #
Full screen mode is enabled by adding fullScreen property.
Without Thumbnails #
Thumbnails can also be hidden in full screen mode.
Custom Content #
Using activeIndex, Galleria is displayed with a specific initial image.
Navigator #
With Thumbnails #
Add showItemNavigators to display navigator elements and the left and right side.
Without Thumbnails #
Simple example with indicators only.
Display on Hover #
Navigators are displayed on hover only if showItemNavigatorsOnHover is enabled.
With Indicators #
Navigators and Indicators can be combined as well.
AutoPlay #
A slideshow implementation is defined by adding circular and autoPlay properties.
Caption #
Description of an image is specified with the caption template.
Description for Image 1
Advanced #
Galleria can be extended further to implement complex requirements.
Accessibility #
Screen Reader
Galleria uses region role and since any attribute is passed to the main container element, attributes such as aria-label and aria-roledescription can be used as well. The slides container has aria-live attribute set as "polite" if galleria is not in autoplay mode, otherwise "off" would be the value in autoplay.
A slide has a group role with an aria-label that refers to the aria.slideNumber property of the locale API. Similarly aria.slide is used as the aria-roledescription of the item. Inactive slides are hidden from the readers with aria-hidden.
Next and Previous navigators are button elements with aria-label attributes referring to the aria.nextPageLabel and aria.firstPageLabel properties of the locale API by default respectively, you may still use your own aria roles and attributes as any valid attribute is passed to the button elements implicitly by using nextButtonProps and prevButtonProps.
Quick navigation elements and thumnbails follow the tab pattern. They are placed inside an element with a tablist role whereas each item has a tab role with aria-selected and aria-controls attributes. The aria-label attribute of a quick navigation item refers to the aria.pageLabel of the locale API. Current page is marked with aria-current.
In full screen mode, modal element uses dialog role with aria-modal enabled. The close button retrieves aria-label from the aria.close property of the locale API.
Next/Prev Keyboard Support
| Key | Function |
|---|---|
| tab | Moves focus through interactive elements in the carousel. |
| enter | Activates navigation. |
| space | Activates navigation. |
Quick Navigation Keyboard Support
| Key | Function |
|---|---|
| tab | Moves focus through the active slide link. |
| enter | Activates the focused slide link. |
| space | Activates the focused slide link. |
| right arrow | Moves focus to the next slide link. |
| left arrow | Moves focus to the previous slide link. |
| home | Moves focus to the first slide link. |
| end | Moves focus to the last slide link. |
