React Placeholder Component
Placeholder
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Use loading react placeholders for your components or pages to indicate something may still be loading.
Other Frameworks
CoreUI components are available as native Angular, Bootstrap (Vanilla JS), and Vue components. To learn more please visit the following pages.
About#
Placeholders can be used to enhance the experience of your application. They're built only with HTML and CSS, meaning you don't need any JavaScript to create them. You will, however, need some custom JavaScript to toggle their visibility. Their appearance, color, and sizing can be easily customized with our utility classes.
Example#
In the example below, we take a typical card component and recreate it with placeholders applied to create a "loading card". Size and proportions are the same between the two.
Card title
Some quick example text to build on the card title and make up the bulk of the card's content.
Go somewhereHow it works#
Create placeholders with the <CPlaceholder> component and a grid column propx (e.g., xs={6}) to set the width. They can replace the text inside an element or be added as a modifier class to an existing component.
We apply additional styling to CButtons via ::before to ensure the height is respected. You may extend this pattern for other situations as needed, or add a within the element to reflect the height when actual text is rendered in its place.
The use of aria-hidden="true" only indicates that the element should be hidden to
screen readers. The loading behavior of the placeholder depends on how authors
will actually use the placeholder styles, how they plan to update things, etc. Some JavaScript
code may be needed to swap the state of the placeholder and inform AT users of the update.
Width#
You can change the width through grid column classes, width utilities, or inline styles.
Color#
By default, the <CPlaceholder> uses currentColor. This can be overridden with a custom color or utility class.
Sizing#
The size of <CPlaceholder>s are based on the typographic style of the parent element. Customize them with size prop: lg, sm, or xs.
Animation#
Animate placeholders with animation="glow" or animation="wave" to better convey the perception of something being actively loaded.
API#
Check out the documentation below for a comprehensive guide to all the props you can use with the components mentioned here.