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              <h1>Accessible Accordion Widget</h1>
<ul>
    <li>Use up and down cursor keys to navigate through the "accordion triggers".</li>
    <li>Click  or press Space or Enter to open/close an accordion.</li>
    <li>Press Tab to jump to the open accordion panel.</li>
    <li>Applies correct <code>aria</code> states and stateful classes - so you can style them how you prefer</li>
    <li>Default open panels can be set with JS when instantiating, or by adding <code>.is-selected</code> to the accordion trigger</li>
    <li>Supports an accordion of 1 item (useful for "show advanced")</li>
</ul>

<div role="tablist" aria-multiselectable="true" class="accordion-interface">
    <h2>Multiple panels can be opened at once</h2>
    
    <a href="#accordion1" role="tab" aria-controls="accordion1" class="accordion-trigger js-accordion-trigger">Accordion 1</a>
    <div id="accordion1" role="tabpanel" class="accordion-panel js-accordion-panel">
        <div class="accordion-panel__inner">
            <h3>Accordion 1</h3>
            <p>Duis sagittis, est sit amet gravida tristique, purus lectus venenatis urna, id molestie magna risus ut nunc. Aliquam nisl enim, tristique tempus placerat at, posuere in lectus. Vestibulum sit amet ipsum lacus. Suspendisse <em>potenti</em>. </p>
            <p>Nulla lobortis tempus commodo. Fusce ac sodales magna. Cras molestie risus a <q cite='http://www.heydonworks.com'>enim convallis vitae</q> luctus libero lacinia. Donec tempus tempus tellus, ac lacinia turpis mattis ac. Maecenas sit <q cite='http://www.heydonworks.com'>amet tellus nec mi gravida posuere</q> non pretium magna. Aliquam nisl enim, tristique tempus placerat at, posuere in lectus. Aliquam tincidunt velit sit amet ante hendrerit tempus. Sed mauris arcu, aliquet ultrices malesuada sed, pretium id <kbd>CTRL</kbd> + <kbd>V</kbd> massa. </p>
        </div>
    </div>

    <a href="#accordion2" role="tab" aria-controls="accordion2" class="accordion-trigger js-accordion-trigger">Accordion 2</a>
    <div id="accordion2" role="tabpanel" class="accordion-panel js-accordion-panel">
        <div class="accordion-panel__inner">
            <h3>Accordion 2</h3>
            <p>Fusce ac sodales <abbr title='Cascading Style Sheets'>CSS</abbr> magna. Donec et nisi dictum felis sollicitudin congue. Aliquam nisl enim, tristique tempus placerat at, posuere in lectus. Sed dapibus, lectus sit amet adipiscing egestas, mauris est viverra
                nibh, iaculis pretium sem orci aliquet mauris. Suspendisse <del>potenti</del>. Duis sagittis, est sit amet gravida tristique, purus lectus venenatis urna, id molestie magna risus ut nunc. Fusce ac sodales magna. Potenti et eros sed justo commodo bibendum
                non at nunc. </p>
            <p>Suspendisse potenti cras molestie, risus a enim convallis vitae luctus libero lacinia. Nulla vel magna sit amet dui <a href='#'>lobortis</a> commodo vitae vel nulla. Suspendisse potenti. Sed dapibus, lectus sit amet adipiscing egestas, mauris est viverra
                nibh, <a href='#'>iaculis pretium</a> sem orci aliquet mauris. Donec a congue leo. Vestibulum sit amet ipsum lacus. </p>
            </div>
    </div>

    <a href="#accordion3" role="tab" aria-controls="accordion3" class="accordion-trigger js-accordion-trigger">Accordion 3</a>
    <div id="accordion3" role="tabpanel" class="accordion-panel js-accordion-panel">
        <div class="accordion-panel__inner">
            <h3>Accordion 3</h3>
            <p>Potenti et eros sed justo commodo bibendum non at nunc. Maecenas sit amet tellus nec mi gravida posuere non pretium magna. Nulla auctor eleifend turpis consequat pharetra. </p>
            <p>Vestibulum sit amet ipsum lacus. Lorem ipsum dolor sit amet, consectetur <em>adipiscing elit</em>. Sed dapibus, lectus sit amet adipiscing egestas, mauris est viverra nibh, iaculis pretium sem orci aliquet mauris. Duis sagittis, est sit amet gravida
                tristique, purus lectus venenatis urna, id molestie magna risus ut nunc. Nulla vel magna sit amet dui <a href='#'>lobortis</a> commodo vitae vel nulla. </p>
            <p>Suspendisse potenti. Aliquam nisl enim, tristique tempus placerat at, posuere in lectus. Lorem ipsum dolor sit amet, consectetur <em>adipiscing elit</em>. Suspendisse potenti H<sub>2</sub>0. </p>
            </div>
    </div>
</div>

<div role="tablist" class="accordion-interface">
    <h2>Only one panel can be opened</h2>
    
    <a href="#accordion1" role="tab" aria-controls="accordion1" class="accordion-trigger js-accordion-trigger">Accordion 1</a>
    <div id="accordion1" role="tabpanel" class="accordion-panel js-accordion-panel">
        <div class="accordion-panel__inner">
            <h3>Accordion 1</h3>
            <p>Duis sagittis, est sit amet gravida tristique, purus lectus venenatis urna, id molestie magna risus ut nunc. Aliquam nisl enim, tristique tempus placerat at, posuere in lectus. Vestibulum sit amet ipsum lacus. Suspendisse <em>potenti</em>. </p>
            <p>Nulla lobortis tempus commodo. Fusce ac sodales magna. Cras molestie risus a <q cite='http://www.heydonworks.com'>enim convallis vitae</q> luctus libero lacinia. Donec tempus tempus tellus, ac lacinia turpis mattis ac. Maecenas sit <q cite='http://www.heydonworks.com'>amet tellus nec mi gravida posuere</q> non pretium magna. Aliquam nisl enim, tristique tempus placerat at, posuere in lectus. Aliquam tincidunt velit sit amet ante hendrerit tempus. Sed mauris arcu, aliquet ultrices malesuada sed, pretium id <kbd>CTRL</kbd> + <kbd>V</kbd> massa. </p>
        </div>
    </div>

    <a href="#accordion2" role="tab" aria-controls="accordion2" class="accordion-trigger js-accordion-trigger">Accordion 2</a>
    <div id="accordion2" role="tabpanel" class="accordion-panel js-accordion-panel">
        <div class="accordion-panel__inner">
            <h3>Accordion 2</h3>
            <p>Fusce ac sodales <abbr title='Cascading Style Sheets'>CSS</abbr> magna. Donec et nisi dictum felis sollicitudin congue. Aliquam nisl enim, tristique tempus placerat at, posuere in lectus. Sed dapibus, lectus sit amet adipiscing egestas, mauris est viverra
                nibh, iaculis pretium sem orci aliquet mauris. Suspendisse <del>potenti</del>. Duis sagittis, est sit amet gravida tristique, purus lectus venenatis urna, id molestie magna risus ut nunc. Fusce ac sodales magna. Potenti et eros sed justo commodo bibendum
                non at nunc. </p>
            <p>Suspendisse potenti cras molestie, risus a enim convallis vitae luctus libero lacinia. Nulla vel magna sit amet dui <a href='#'>lobortis</a> commodo vitae vel nulla. Suspendisse potenti. Sed dapibus, lectus sit amet adipiscing egestas, mauris est viverra
                nibh, <a href='#'>iaculis pretium</a> sem orci aliquet mauris. Donec a congue leo. Vestibulum sit amet ipsum lacus. </p>
            </div>
    </div>

    <a href="#accordion3" role="tab" aria-controls="accordion3" class="accordion-trigger js-accordion-trigger">Accordion 3</a>
    <div id="accordion3" role="tabpanel" class="accordion-panel js-accordion-panel">
        <div class="accordion-panel__inner">
            <h3>Accordion 3</h3>
            <p>Potenti et eros sed justo commodo bibendum non at nunc. Maecenas sit amet tellus nec mi gravida posuere non pretium magna. Nulla auctor eleifend turpis consequat pharetra. </p>
            <p>Vestibulum sit amet ipsum lacus. Lorem ipsum dolor sit amet, consectetur <em>adipiscing elit</em>. Sed dapibus, lectus sit amet adipiscing egestas, mauris est viverra nibh, iaculis pretium sem orci aliquet mauris. Duis sagittis, est sit amet gravida
                tristique, purus lectus venenatis urna, id molestie magna risus ut nunc. Nulla vel magna sit amet dui <a href='#'>lobortis</a> commodo vitae vel nulla. </p>
            <p>Suspendisse potenti. Aliquam nisl enim, tristique tempus placerat at, posuere in lectus. Lorem ipsum dolor sit amet, consectetur <em>adipiscing elit</em>. Suspendisse potenti H<sub>2</sub>0. </p>
        </div>
    </div>
</div>
            
          
!
            
              .accordion-trigger {
    background: lightgrey;
    border: 1px solid;
    color: #000;
    display: block;
    font-weight: bold;
    padding: 10px;
    text-decoration: none;
    
    &.is-selected {
        background: lightblue;
    }
    
    &:before {
        // Don't use generated content for the indicator in production as it gets read to screenreaders
        content: "+";
        display: inline-block;
        width: 15px;
    }
    
    &.is-selected:before {
        content: "–";
    }
}

.accordion-panel {
    max-height: 1000px;
    opacity: 1;
    transform: scaleY(1);
    transform-origin: top;
    transition: transform ease 0.5s, opacity ease 0.5s, max-height ease 0.75s;
    visibility: visible;
    
    &.is-hidden {
        max-height: 0;
        opacity: 0;
        overflow: hidden;
        transform: scaleY(0);
        transition: all ease 0.5s;
        visibility: hidden;
    }
}

.accordion-panel__inner {
    border: 1px solid;
    border-top: none;
    padding: 10px;
}

body {
    font-family: sans-serif;
    margin: auto;
    padding: 30px;
    max-width: 960px;
    overflow-y: scroll;
}

li {
    margin: 0.25em 0;
}

h1, h2, h3 {
    margin-top: 0;
}

h1 {
    font-size: (25 / 16) * 1em;
}

h2 {
    font-size: (22 / 16) * 1em;
}

code {
    font-size: (20 / 16) * 1em;
}

.accordion-interface {
    float: left;
    margin: 0 2% 30px; 
    width: 46%
}

:focus {
    box-shadow: 0 0 4px dodgerblue;
    outline: none;
}
            
          
!
            
              function AccordionWidget (el, selectedIndex) {
    if (!el) {
        return;
    }

    this.el = el;

    this.accordionTriggers = this.el.getElementsByClassName('js-accordion-trigger');
    this.accordionPanels = this.el.getElementsByClassName('js-accordion-panel');

    if (this.accordionTriggers.length === 0 || this.accordionTriggers.length !== this.accordionPanels.length) {
        return;
    }

    this._init(selectedIndex);
}

AccordionWidget.prototype._init = function (selectedIndex) {
    this.accordionTriggersLength = this.accordionTriggers.length;
    this.expandedAccordions = new Array(this.accordionTriggersLength);
    this.multiSelectable = this.el.hasAttribute('aria-multiselectable');
    this.clickListener = this._clickEvent.bind(this);
    this.keydownListener = this._keydownEvent.bind(this);
    this.focusListener = this._focusEvent.bind(this);
    this.keys = {
        prev: 38,
        next: 40,
        space: 32
    };

    var initialSelectedIndex;

    for (var i = 0; i < this.accordionTriggersLength; i++) {
        this.accordionTriggers[i].index = i;
        this.accordionTriggers[i].addEventListener('click', this.clickListener, false);
        this.accordionTriggers[i].addEventListener('keydown', this.keydownListener, false);
        this.accordionTriggers[i].addEventListener('focus', this.focusListener, false);

        if (this.accordionTriggers[i].classList.contains('is-selected')) {
            this.expandedAccordions[i] = true;
        }
    }

    if (!isNaN(selectedIndex)) {
        initialSelectedIndex = selectedIndex < this.accordionTriggersLength ? selectedIndex : this.accordionTriggersLength - 1;
        this.expandedAccordions = new Array(this.accordionTriggersLength);
        this.expandedAccordions[initialSelectedIndex] = true;
    }
    else {
        initialSelectedIndex = this.expandedAccordions.lastIndexOf(true);

        if (!this.multiSelectable) {
            this.expandedAccordions = new Array(this.accordionTriggersLength);
            this.expandedAccordions[initialSelectedIndex] = true;
        }
    }

    this.setSelected(initialSelectedIndex);
    this.setExpanded();
    this.el.classList.add('is-initialized');
};

AccordionWidget.prototype._clickEvent = function (e) {
    e.preventDefault();

    this.setSelected(e.target.index, true);
    this.setExpanded(e.target.index, true);
};

AccordionWidget.prototype._keydownEvent = function (e) {
    var targetIndex;

    switch (e.keyCode) {
        case this.keys.space:
        case this.keys.prev:
        case this.keys.next:
            e.preventDefault();
            break;
        default:
            return;
    }

    if (e.keyCode === this.keys.space) {
        this.setExpanded(e.target.index, true);

        return;
    }
    else if (e.keyCode === this.keys.prev && e.target.index > 0) {
        targetIndex = e.target.index - 1;
    }
    else if (e.keyCode === this.keys.next && e.target.index < this.accordionTriggersLength - 1) {
        targetIndex = e.target.index + 1;
    }
    else {
        return;
    }

    this.setSelected(targetIndex, true);
};

AccordionWidget.prototype._focusEvent = function () {
    if (this.accordionTriggersLength === 1) {
        this.setSelected(0);
    }

    return;
};

AccordionWidget.prototype.setSelected = function (index, userInvoked) {
    if (index === -1) {
        this.accordionTriggers[0].setAttribute('tabindex', 0);

        return;
    }

    for (var i = 0; i < this.accordionTriggersLength; i++) {
        if (i === index) {
            this.accordionTriggers[i].classList.add('is-selected');
            this.accordionTriggers[i].setAttribute('aria-selected', true);
            this.accordionTriggers[i].setAttribute('tabindex', 0);

            if (userInvoked) {
                this.accordionTriggers[i].focus();
            }
        }
        else {
            this.accordionTriggers[i].classList.remove('is-selected');
            this.accordionTriggers[i].setAttribute('aria-selected', false);
            this.accordionTriggers[i].setAttribute('tabindex', -1);
        }
    }
};

AccordionWidget.prototype.setExpanded = function (index, userInvoked) {
    var i;

    if (userInvoked) {
        if (this.multiSelectable) {
            this.expandedAccordions[index] = !this.expandedAccordions[index];
        }
        else {
            for (i = 0; i < this.accordionTriggersLength; i++) {
                if (i === index) {
                    this.expandedAccordions[i] = !this.expandedAccordions[i];
                }
                else {
                    this.expandedAccordions[i] = false;
                }
            }
        }
    }

    for (i = 0; i < this.accordionTriggersLength; i++) {
        if (this.expandedAccordions[i]) {
            this.accordionTriggers[i].setAttribute('aria-expanded', true);
            this.accordionTriggers[i].classList.add('is-expanded');

            this.accordionPanels[i].setAttribute('aria-hidden', false);
            this.accordionPanels[i].classList.remove('is-hidden');
            this.accordionPanels[i].setAttribute('tabindex', 0);
        }
        else {
            this.accordionTriggers[i].setAttribute('aria-expanded', false);
            this.accordionTriggers[i].classList.remove('is-expanded');

            this.accordionPanels[i].setAttribute('aria-hidden', true);
            this.accordionPanels[i].classList.add('is-hidden');
            this.accordionPanels[i].setAttribute('tabindex', -1);
        }
    }
};

AccordionWidget.prototype.destroy = function () {
    this.el.classList.remove('is-initialized');

    for (var i = 0; i < this.accordionTriggersLength; i++) {
        this.accordionTriggers[i].removeAttribute('aria-expanded');
        this.accordionTriggers[i].removeAttribute('aria-selected');
        this.accordionTriggers[i].classList.remove('is-expanded');

        this.accordionPanels[i].removeAttribute('aria-hidden');
        this.accordionPanels[i].classList.remove('is-hidden');
        this.accordionPanels[i].removeAttribute('tabindex');

        this.accordionTriggers[i].removeEventListener('click', this.clickListener, false);
        this.accordionTriggers[i].removeEventListener('keydown', this.keydownListener, false);
        this.accordionTriggers[i].removeEventListener('focus', this.focusListener, false);

        delete this.accordionTriggers[i].index;
    }
};

new AccordionWidget(document.getElementsByClassName('accordion-interface')[0], 0);

new AccordionWidget(document.getElementsByClassName('accordion-interface')[1], 1);

            
          
!
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