@bentoproject/accordion
Advanced tools
Displays content sections that can be collapsed and expanded.
Displays content sections that can be collapsed and expanded. This component provides a way for viewers to glance at the content outline and jump to any section. Effective use reduces scrolling needs on mobile devices.
<section> elements as its direct children.<section> must contain exactly two direct children.<section> is the heading for that section of the Bento Accordion. It must be a heading element such as <h1>-<h6> or <header>.<section> is the expandable/collapsible content.
<section> heading expands or collapses the section.id preserves the collapsed or expanded state of each section while the user remains on your domain.You must include each Bento component's required CSS library to guarantee proper loading and before adding custom styles. Or use the light-weight pre-upgrade styles available inline. See Layout and style.
npm install @bentoproject/accordion
import {defineElement as defineBentoAccordion} from '@bentoproject/accordion';
defineBentoAccordion();
<script><script type="module" src="https://cdn.ampproject.org/bento.mjs" crossorigin="anonymous"></script>
<script nomodule src="https://cdn.ampproject.org/bento.js" crossorigin="anonymous"></script>
<script type="module" src="https://cdn.ampproject.org/v0/bento-accordion-1.0.mjs" crossorigin="anonymous"></script>
<script nomodule src="https://cdn.ampproject.org/v0/bento-accordion-1.0.js" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://cdn.ampproject.org/v0/bento-accordion-1.0.css" crossorigin="anonymous">
<!DOCTYPE html>
<html>
<head>
<script
type="module"
async
src="https://cdn.ampproject.org/bento.mjs"
></script>
<script nomodule src="https://cdn.ampproject.org/bento.js"></script>
<script
type="module"
async
src="https://cdn.ampproject.org/v0/bento-accordion-1.0.mjs"
></script>
<script
nomodule
async
src="https://cdn.ampproject.org/v0/bento-accordion-1.0.js"
></script>
<link
rel="stylesheet"
type="text/css"
href="https://cdn.ampproject.org/v0/bento-accordion-1.0.css"
/>
</head>
<body>
<bento-accordion id="my-accordion">
<section>
<h2>Section 1</h2>
<div>Content in section 1.</div>
</section>
<section>
<h2>Section 2</h2>
<div>Content in section 2.</div>
</section>
<!-- Expanded on page load due to attribute: -->
<section expanded>
<h2>Section 3</h2>
<div>Content in section 3.</div>
</section>
</bento-accordion>
</body>
</html>
Bento components are highly interactive through their API. The bento-accordion component API is accessible by including the following script tag in your document:
await customElements.whenDefined('bento-accordion');
const api = await accordion.getApi();
<!DOCTYPE html>
<html>
<head>
<script
type="module"
async
src="https://cdn.ampproject.org/bento.mjs"
></script>
<script nomodule src="https://cdn.ampproject.org/bento.js"></script>
<script
type="module"
async
src="https://cdn.ampproject.org/v0/bento-accordion-1.0.mjs"
></script>
<script
nomodule
async
src="https://cdn.ampproject.org/v0/bento-accordion-1.0.js"
></script>
<link
rel="stylesheet"
type="text/css"
href="https://cdn.ampproject.org/v0/bento-accordion-1.0.css"
/>
</head>
<body>
<bento-accordion id="my-accordion">
<section>
<h2>Section 1</h2>
<div>Content in section 1.</div>
</section>
<section>
<h2>Section 2</h2>
<div>Content in section 2.</div>
</section>
<!-- Expanded on page load due to attribute: -->
<section expanded>
<h2>Section 3</h2>
<div>Content in section 3.</div>
</section>
</bento-accordion>
<script>
(async () => {
const accordion = document.querySelector('#my-accordion');
await customElements.whenDefined('bento-accordion');
const api = await accordion.getApi();
// programatically expand all sections
api.expand();
// programatically collapse all sections
api.collapse();
})();
</script>
</body>
</html>
The toggle action switches the expanded and collapsed states of bento-accordion sections. When called with no arguments, it toggles all sections of the accordion. To specify a specific section, add the section argument and use its corresponding id as the value.
<bento-accordion id="myAccordion">
<section id="section1">
<h2>Section 1</h2>
<div>Bunch of awesome content</div>
</section>
<section>
<h2>Section 2</h2>
<div>Bunch of awesome content</div>
</section>
<section>
<h2>Section 3</h2>
<div>Bunch of awesome content</div>
</section>
</bento-accordion>
<button id="button1">Toggle All Sections</button>
<button id="button2">Toggle Section 1</button>
<script>
(async () => {
const accordion = document.querySelector('#myAccordion');
await customElements.whenDefined('bento-accordion');
const api = await accordion.getApi();
// set up button actions
document.querySelector('#button1').onclick = () => {
api.toggle();
};
document.querySelector('#button2').onclick = () => {
api.toggle('section1');
};
})();
</script>
The expand action expands the sections of the bento-accordion. If a section is already expanded, it stays expanded. When called with no arguments, it expands all sections of the accordion. To specify a section, add the section argument, and use its corresponding id as the value.
<bento-accordion id="myAccordion">
<section id="section1">
<h2>Section 1</h2>
<div>Bunch of awesome content</div>
</section>
<section>
<h2>Section 2</h2>
<div>Bunch of awesome content</div>
</section>
<section>
<h2>Section 3</h2>
<div>Bunch of awesome content</div>
</section>
</bento-accordion>
<button id="button1">Expand All Sections</button>
<button id="button2">Expand Section 1</button>
<script>
(async () => {
const accordion = document.querySelector('#myAccordion');
await customElements.whenDefined('bento-accordion');
const api = await accordion.getApi();
// set up button actions
document.querySelector('#button1').onclick = () => {
api.expand();
};
document.querySelector('#button2').onclick = () => {
api.expand('section1');
};
})();
</script>
The collapse action collapses the sections of the bento-accordion. If a section is already collapsed, it stays collapsed. When called with no arguments, it collapses all sections of the accordion. To specify a section, add the section argument, and use its corresponding id as the value.
<bento-accordion id="myAccordion">
<section id="section1">
<h2>Section 1</h2>
<div>Bunch of awesome content</div>
</section>
<section>
<h2>Section 2</h2>
<div>Bunch of awesome content</div>
</section>
<section>
<h2>Section 3</h2>
<div>Bunch of awesome content</div>
</section>
</bento-accordion>
<button id="button1">Collapse All Sections</button>
<button id="button2">Collapse Section 1</button>
<script>
(async () => {
const accordion = document.querySelector('#myAccordion');
await customElements.whenDefined('bento-accordion');
const api = await accordion.getApi();
// set up button actions
document.querySelector('#button1').onclick = () => {
api.collapse();
};
document.querySelector('#button2').onclick = () => {
api.collapse('section1');
};
})();
</script>
The bento-accordion API allows you to register and respond to the following events:
This event is triggered when an accordion section is expanded and is dispatched from the expanded section.
See below for example.
This event is triggered when an accordion section is collapsed and is dispatched from the collapsed section.
In the example below, section 1 listens for the expand event and expands section 2 when it is expanded. section 2 listens for the collapse event and collapses section 1 when it is collapsed.
See below for example.
<bento-accordion id="eventsAccordion" animate>
<section id="section1">
<h2>Section 1</h2>
<div>Puppies are cute.</div>
</section>
<section id="section2">
<h2>Section 2</h2>
<div>Kittens are furry.</div>
</section>
</bento-accordion>
<script>
(async () => {
const accordion = document.querySelector('#eventsAccordion');
await customElements.whenDefined('bento-accordion');
const api = await accordion.getApi();
// when section 1 expands, section 2 also expands
// when section 2 collapses, section 1 also collapses
const section1 = document.querySelector('#section1');
const section2 = document.querySelector('#section2');
section1.addEventListener('expand', () => {
api.expand('section2');
});
section2.addEventListener('collapse', () => {
api.collapse('section1');
});
})();
</script>
Each Bento component has a small CSS library you must include to guarantee proper loading without content shifts. Because of order-based specificity, you must manually ensure that stylesheets are included before any custom styles.
<link
rel="stylesheet"
type="text/css"
href="https://cdn.ampproject.org/v0/bento-accordion-1.0.css"
/>
Alternatively, you may also make the light-weight pre-upgrade styles available inline:
<style>
bento-accordion {
display: block;
contain: layout;
}
bento-accordion,
bento-accordion > section,
bento-accordion > section > :first-child {
margin: 0;
}
bento-accordion > section > * {
display: block;
float: none;
overflow: hidden; /* clearfix */
position: relative;
}
@media (min-width: 1px) {
:where(bento-accordion > section) > :first-child {
cursor: pointer;
background-color: #efefef;
padding-right: 20px;
border: 1px solid #dfdfdf;
}
}
.i-amphtml-accordion-header {
cursor: pointer;
background-color: #efefef;
padding-right: 20px;
border: 1px solid #dfdfdf;
}
bento-accordion
> section:not([expanded])
> :last-child:not(.i-amphtml-animating),
bento-accordion
> section:not([expanded])
> :last-child:not(.i-amphtml-animating)
* {
display: none !important;
}
</style>
Include the animate attribute in <bento-accordion> to add a "roll down" animation when the content is expanded and "roll up" animation when collapsed.
This attribute can be configured to based on a media query.
<bento-accordion animate>
<section>
<h2>Section 1</h2>
<div>Content in section 1.</div>
</section>
<section>
<h2>Section 2</h2>
<div>Content in section 2.</div>
</section>
<section>
<h2>Section 3</h2>
<div>Content in section 2.</div>
</section>
</bento-accordion>
Apply the expanded attribute to a nested <section> to expand that section when the page loads.
<bento-accordion>
<section id="section1">
<h2>Section 1</h2>
<div>Bunch of awesome content</div>
</section>
<section id="section2">
<h2>Section 2</h2>
<div>Bunch of awesome content</div>
</section>
<section id="section3" expanded>
<h2>Section 3</h2>
<div>Bunch of awesome expanded content</div>
</section>
</bento-accordion>
Allow only one section to expand at a time by applying the expand-single-section attribute to the <bento-accordion> element. This means if a user taps on a collapsed <section>, it will expand and collapse other expanded <section>'s.
<bento-accordion expand-single-section>
<section>
<h2>Section 1</h2>
<div>Content in section 1.</div>
</section>
<section>
<h2>Section 2</h2>
<div>Content in section 2.</div>
</section>
<section>
<h2>Section 3</h2>
<img
src="https://source.unsplash.com/random/320x256"
width="320"
height="256"
/>
</section>
</bento-accordion>
You may use the bento-accordion element selector to style the accordion freely.
Keep the following points in mind when you style an accordion:
bento-accordion elements are always display: block.float cannot style a <section>, heading, nor content elements.expanded attribute to the <section> element.overflow: hidden and hence cannot have scrollbars.<bento-accordion>, <section>, heading, and content elements are set to 0, but can be overridden in custom styles.position: relative.npm install @bentoproject/accordion
import React from 'react';
import {
BentoAccordion,
BentoAccordionSection,
BentoAccordionHeader,
BentoAccordionContent
} from '@bentoproject/accordion/react';
import '@bentoproject/accordion/styles.css';
function App() {
return (
<BentoAccordion>
<BentoAccordionSection key={1}>
<BentoAccordionHeader>
<h1>Section 1</h1>
</BentoAccordionHeader>
<BentoAccordionContent>Content 1</BentoAccordionContent>
</BentoAccordionSection>
<BentoAccordionSection key={2}>
<BentoAccordionHeader>
<h1>Section 2</h1>
</BentoAccordionHeader>
<BentoAccordionContent>Content 2</BentoAccordionContent>
</BentoAccordionSection>
<BentoAccordionSection key={3}>
<BentoAccordionHeader>
<h1>Section 3</h1>
</BentoAccordionHeader>
<BentoAccordionContent>Content 3</BentoAccordionContent>
</BentoAccordionSection>
</BentoAccordion>
);
}
Bento components are highly interactive through their API. The BentoAccordion component API is accessible by passing a ref:
import React, {createRef} from 'react';
const ref = createRef();
function App() {
return (
<BentoAccordion ref={ref}>
<BentoAccordionSection id="section1" key={1}>
<BentoAccordionHeader>
<h1>Section 1</h1>
</BentoAccordionHeader>
<BentoAccordionContent>Content 1</BentoAccordionContent>
</BentoAccordionSection>
<BentoAccordionSection id="section2" key={2}>
<BentoAccordionHeader>
<h1>Section 2</h1>
</BentoAccordionHeader>
<BentoAccordionContent>Content 2</BentoAccordionContent>
</BentoAccordionSection>
<BentoAccordionSection id="section3" key={3}>
<BentoAccordionHeader>
<h1>Section 3</h1>
</BentoAccordionHeader>
<BentoAccordionContent>Content 3</BentoAccordionContent>
</BentoAccordionSection>
</BentoAccordion>
);
}
The BentoAccordion API allows you to perform the following actions:
The toggle action switches the expanded and collapsed states of bento-accordion sections. When called with no arguments, it toggles all sections of the accordion. To specify a specific section, add the section argument and use its corresponding id as the value.
ref.current.toggle();
ref.current.toggle('section1');
The expand action expands the sections of the bento-accordion. If a section is already expanded, it stays expanded. When called with no arguments, it expands all sections of the accordion. To specify a section, add the section argument, and use its corresponding id as the value.
ref.current.expand();
ref.current.expand('section1');
The collapse action collapses the sections of the bento-accordion. If a section is already collapsed, it stays collapsed. When called with no arguments, it collapses all sections of the accordion. To specify a section, add the section argument, and use its corresponding id as the value.
ref.current.collapse();
ref.current.collapse('section1');
The Bento Accordion API allows you to respond to the following events:
This event is triggered on a section when an accordion section is expanded or collpased and is dispatched from the expanded section.
See example below for example.
This event is triggered on a section when an accordion section is collapsed and is dispatched from the collapsed section.
In the example below, section 1 listens for the expand event and expands section 2 when it is expanded. section 2 listens for the collapse event and collapses section 1 when it is collapsed.
See example below for example.
import React, {createRef} from 'react';
import {
BentoAccordion,
BentoAccordionSection,
BentoAccordionHeader,
BentoAccordionContent
} from '@bentoproject/accordion/react';
import '@bentoproject/accordion/styles.css';
function App() {
const ref = createRef();
return (
<BentoAccordion ref={ref}>
<BentoAccordionSection
id="section1"
key={1}
onExpandStateChange={(expanded) => {
alert(expanded ? 'section1 expanded' : 'section1 collapsed');
}}
>
<BentoAccordionHeader>
<h1>Section 1</h1>
</BentoAccordionHeader>
<BentoAccordionContent>Content 1</BentoAccordionContent>
</BentoAccordionSection>
<BentoAccordionSection
id="section2"
key={2}
onExpandStateChange={(expanded) => {
alert(expanded ? 'section2 expanded' : 'section2 collapsed');
}}
>
<BentoAccordionHeader>
<h1>Section 2</h1>
</BentoAccordionHeader>
<BentoAccordionContent>Content 2</BentoAccordionContent>
</BentoAccordionSection>
<BentoAccordionSection
id="section3"
key={3}
onExpandStateChange={(expanded) => {
alert(expanded ? 'section3 expanded' : 'section3 collapsed');
}}
>
<BentoAccordionHeader>
<h1>Section 3</h1>
</BentoAccordionHeader>
<BentoAccordionContent>Content 3</BentoAccordionContent>
</BentoAccordionSection>
</BentoAccordion>
)
}
The BentoAccordion component has a defined layout size type. To ensure the component renders correctly, be sure to apply a size to the component and its immediate children via a desired CSS layout (such as one defined with height, width, aspect-ratio, or other such properties). These can be applied inline:
<BentoAccordion style={{width: 300, height: 100}}>...</BentoAccordion>
Or via className:
<BentoAccordion className="custom-styles">...</BentoAccordion>
.custom-styles {
background-color: red;
}
If true, then uses "roll-down" / "roll-up" animation during the expansion and collapse of each section.
Default: false
If true, then expanding 1 section will automatically collapse all other sections.
Default: false
If true, then uses "roll-down" / "roll-up" animation during the expansion and collapse the section.
Default: false
If true, expands the section.
Default: false
(expanded: boolean): void
Callback to listen for expand state changes. Takes a boolean flag as parameter indicating whether the section was just expanded (false indicates it was collapsed)
This component supports the common props for React and Preact components.
BentoAccordionHeader does not yet support any custom props
This component supports the common props for React and Preact components.
BentoAccordionContent does not yet support any custom props
FAQs
Displays content sections that can be collapsed and expanded.
We found that @bentoproject/accordion demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
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