amp-base-carousel
Description
Displays multiple similar pieces of content along a horizontal axis or vertical axis.
Required Scripts
<script async custom-element="amp-base-carousel" src="https://cdn.ampproject.org/v0/amp-base-carousel-1.0.js"></script>
<script async custom-element="amp-base-carousel" src="https://cdn.ampproject.org/v0/amp-base-carousel-1.0.js"></script> <link rel="stylesheet" href="https://cdn.ampproject.org/v0/amp-base-carousel-1.0.css">
Supported Layouts
Usage
A generic carousel for displaying multiple similar pieces of content along a horizontal or vertical axis.
Each of the amp-base-carousel
component’s immediate children is considered an
item in the carousel. Each of these nodes may also have arbitrary HTML children.
The carousel consists of an arbitrary number of items, as well as optional navigational arrows to go forward or backwards a single item.
The carousel advances between items if the user swipes or uses the customizable arrow buttons.
Standalone use outside valid AMP documents
Bento allows you to use AMP components in non-AMP pages without needing to commit to fully valid AMP. You can take these components and place them in implementations with frameworks and CMSs that don't support AMP. Read more in our guide Use AMP components in non-AMP pages.
To find the standalone version of amp-base-carousel
, see bento-base-carousel
.
Behavior users should be aware of
Right-to-left slide change
<amp-base-carousel>
requires that you define when it is in an
right-to-left (rtl) context (e.g. Arabic, Hebrew pages). While the carousel will
generally work without this, there may be a few bugs. You can let the carousel
know that it should operate as rtl
as follows:
<amp-base-carousel dir="rtl" …> … </amp-base-carousel>
If the carousel is in a RTL context, and you want the carousel to operate as
LTR, you can explicitly set the dir="ltr"
on the carousel.
Slide layout
Slides are automatically sized by the carousel when not specifying
mixed-lengths
. You should give the slides layout="flex-item"
:
<amp-base-carousel …> <amp-img layout="flex-item" src="…"></amp-img> </amp-base-carousel>
The slides have a default height of 100%
when the carousel is laid out
horizontally. This can easily be changed with CSS or by using
layout="fixed-height"
. When specifying the height, the slide will be
vertically centered within the carousel.
If you want to horizontally center your slide content, you will want to create a wrapping element, and use that to center the content.
Number of visible slides
When changing the number of visible slides using visible-slides
, in response
to a media query, you will likely want to change the aspect ratio of the
carousel itself to match the new number of visible slides. For example, if you
want to show three slides at a time with a one by one aspect ratio, you would
want an aspect ratio of three by one for the carousel itself. Similiarly, with
four slides at a time you would want an aspect ratio of four by one. In
addition, when changing visible-slides
, you likely want to change
advance-count
.
<!-- Using an aspect ratio of 3:2 for the slides in this example. --> <amp-base-carousel layout="responsive" width="3" height="1" heights="(min-width: 600px) calc(100% * 4 * 3 / 2), calc(100% * 3 * 3 / 2)" visible-count="(min-width: 600px) 4, 3" advance-count="(min-width: 600px) 4, 3" > <amp-img layout="flex-item" src="…"></amp-img> … </amp-base-carousel>
Attributes
Media Queries
The attributes for <amp-base-carousel>
can be configured to use different
options based on a media query.
Configuration Options
Number of Visible Slides
mixed-length
Either true
or false
, defaults to false
. When true, uses the existing
width (or height when horizontal) for each of the slides. This allows for a
carousel with slides of different widths to be used.
visible-count
A number, defaults to 1
. Determines how many slides should be shown at a given
time. Fractional values can be used to make part of a(n) additional slide(s)
visible. This option is ignored when mixed-length
is true
.
advance-count
A number, defaults to 1
. Determines how many slides the carousel will advance
when advancing using the previous or next arrows. This is useful when specifying
the visible-count
attribute.
Auto Advance
auto-advance
Either true
or false
, defaults to false
. Automatically advances the
carousel to the next slide based on a delay. If the user manually changes
slides, then the auto advance is stopped. Note that if loop
is not enabled,
when reaching the last item, the auto advance will move backwards to the first
item.
auto-advance-count
A number, defaults to 1
. Determines how many slides the carousel will advance
when automatically advancing. This is useful when specifying the visible-count
attribute.
auto-advance-interval
A number, defaults to 1000
. Specifies the amount of time, in milliseconds,
between subsequent automatic advances of the carousel.
auto-advance-loops
A number, defaults to ∞
. The number of times the carousel should advance
through the slides before stopping.
Snapping
snap
Either true
or false
, defaults to true
. Determines whether or not the
carousel should snap on slides when scrolling.
snap-align
Either start
or center
. When start aligning, the start of a slide (e.g. the
left edge, when horizontal aligning) is aligned with the start of a carousel.
When center aligning, the center of a slide is aligned with the center of a
carousel.
snap-by
A number, defaults to 1
. This determines the granularity of snapping and is
useful when using visible-count
.
Miscellaneous
controls
Either "always"
, "auto"
, or "never"
, defaults to "auto"
. This determines if and when prev/next navigational arrows are displayed. Note: When outset-arrows
is true
, the arrows are shown "always"
.
always
: Arrows are always displayed.auto
: Arrows are displayed when the carousel has most recently received interaction via mouse, and not displayed when the carousel has most recently received interaction via touch. On first load for touch devices, arrows are displayed until first interaction.never
: Arrows are never displayed.
slide
A number, defaults to 0
. This determines the initial slide shown in the
carousel. This may be used with amp-bind
to control which slide is currently
showing.
loop
Either true
or false
, defaults to false
when omitted. When true, the carousel will allow the user to move from the first item back to the last item and visa versa. There must be at least three times the visible-count
of slides present for looping to occur.
orientation
Either horizontal
or vertical
, defaults to horizontal
. When horizontal
the carousel will lay out horizontally, with the user being able to swipe left and right. When vertical
, the carousel lays out vertically, with the user being able to swipe up and down.
common attributes
This element includes common attributes extended to AMP components.
Actions
next
Moves the carousel forwards by advance-count
slides.
prev
Moves the carousel backwards by advance-count
slides.
goToSlide
Moves the carousel to the slide specified by the index
argument.
Events
slideChange
This event is triggered when the index displayed by the carousel has changed.
The new index is available via event.index
.
Styling
You may use the amp-base-carousel
element selector to style the carousel
freely.
Customizing Arrow Buttons
Arrow buttons can be customized by passing in your own custom markup. For example, you can recreate the default styling with the following HTML and CSS:
.carousel-prev, .carousel-next { filter: drop-shadow(0px 1px 2px #4a4a4a); width: 40px; height: 40px; padding: 20px; background-color: transparent; border: none; outline: none; } .carousel-prev { background-image: url('data:image/svg+xml;charset=utf-8,<svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M14,7.4 L9.4,12 L14,16.6" fill="none" stroke="#fff" stroke-width="2px" stroke-linejoin="round" stroke-linecap="round" /></svg>'); } .carousel-next { background-image: url('data:image/svg+xml;charset=utf-8,<svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M10,7.4 L14.6,12 L10,16.6" fill="none" stroke="#fff" stroke-width="2px" stroke-linejoin="round" stroke-linecap="round" /></svg>'); }
<amp-base-carousel …> <div>first slide</div> … <button slot="next-arrow" class="carousel-next" aria-label="Next"></button> <button slot="prev-arrow" class="carousel-prev" aria-label="Previous" ></button> </amp-base-carousel>
If you want more customization for the arrow buttons, you can use the next
and
prev
actions. For example, if you want to place buttons under the carousel and
use the words "Previous" and "Next" instead of having them in the default
location, you can use the following HTML:
<amp-base-carousel id="carousel-1" …> … <div slot="next-arrow"></div> <div slot="prev-arrow"></div> </amp-carousel> <button on="tap:carousel-1.prev()">Previous</button> <button on="tap:carousel-1.next()">Next</button>
Version notes
Unlike 0.1
, the experimental 1.0
version of amp-base-carousel
allows configuring the carousel slide orientation via "orientation"="horizontal"|"vertical"
attributes instead of "horizontal"="true"|"false"
attributes.
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