https://desales.edu/_files/js/accordion.js

1'use strict';Array.prototype.slice.call(document.querySelectorAll('.accordion')).forEach(function(accordion){var allowMultiple=accordion.hasAttribute('data-allow-multiple');var allowToggle=(allowMultiple)?allowMultiple:accordion.hasAttribute('data-allow-toggle');var triggers=Array.prototype.slice.call(accordion.querySelectorAll('.accordionTrigger'));var panels=Array.prototype.slice.call(accordion.querySelectorAll('.accordionPanel'));accordion.addEventListener('click',function(event){var target=event.target;if(target.classList.contains('accordionTrigger')){var isExpanded=target.getAttribute('aria-expanded')=='true';var active=accordion.querySelector('[aria-expanded="true"]');if(!allowMultiple&&active&&active!==target){active.setAttribute('aria-expanded','false');document.getElementById(active.getAttribute('aria-controls')).setAttribute('hidden','');if(!allowToggle){active.removeAttribute('aria-disabled');}}
2if(!isExpanded){target.setAttribute('aria-expanded','true');document.getElementById(target.getAttribute('aria-controls')).removeAttribute('hidden');if(!allowToggle){target.setAttribute('aria-disabled','true');}}
3else if(allowToggle&&isExpanded){target.setAttribute('aria-expanded','false');document.getElementById(target.getAttribute('aria-controls')).setAttribute('hidden','');}
4event.preventDefault();}});accordion.addEventListener('keydown',function(event){var target=event.target;var key=event.which.toString();var isExpanded=target.getAttribute('aria-expanded')=='true';var allowToggle=(allowMultiple)?allowMultiple:accordion.hasAttribute('data-allow-toggle');var ctrlModifier=(event.ctrlKey&&key.match(/33|34/));if(target.classList.contains('accordionTrigger')){if(key.match(/38|40/)||ctrlModifier){var index=triggers.indexOf(target);var direction=(key.match(/34|40/))?1:-1;var length=triggers.length;var newIndex=(index+length+direction)%length;triggers[newIndex].focus();event.preventDefault();}
5else if(key.match(/35|36/)){switch(key){case '36':triggers[0].focus();break;case '35':triggers[triggers.length-1].focus();break;}
6event.preventDefault();}}});accordion.querySelectorAll('.accordionTrigger').forEach(function(trigger){trigger.addEventListener('focus',function(event){accordion.classList.add('focus');});trigger.addEventListener('blur',function(event){accordion.classList.remove('focus');});});if(!allowToggle){var expanded=accordion.querySelector('[aria-expanded="true"]');if(expanded){expanded.setAttribute('aria-disabled','true');}}});