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// File#: _1_responsive-sidebar
// Usage: codyhouse.co/license
(function() {
var Sidebar = function(element) {
this.element = element;
this.triggers = document.querySelectorAll('[aria-controls="'+this.element.getAttribute('id')+'"]');
this.firstFocusable = null;
this.lastFocusable = null;
this.selectedTrigger = null;
this.showClass = "sidebar--is-visible";
this.staticClass = "sidebar--static";
this.customStaticClass = "";
this.readyClass = "sidebar--loaded";
this.contentReadyClass = "sidebar-loaded:show";
this.layout = false; // this will be static or mobile
this.preventScrollEl = getPreventScrollEl(this);
getCustomStaticClass(this); // custom classes for static version
initSidebar(this);
};
function getPreventScrollEl(element) {
var scrollEl = false;
var querySelector = element.element.getAttribute('data-sidebar-prevent-scroll');
if(querySelector) scrollEl = document.querySelector(querySelector);
return scrollEl;
};
function getCustomStaticClass(element) {
var customClasses = element.element.getAttribute('data-static-class');
if(customClasses) element.customStaticClass = ' '+customClasses;
};
function initSidebar(sidebar) {
initSidebarResize(sidebar); // handle changes in layout -> mobile to static and viceversa
if ( sidebar.triggers ) { // open sidebar when clicking on trigger buttons - mobile layout only
for(var i = 0; i < sidebar.triggers.length; i++) {
sidebar.triggers[i].addEventListener('click', function(event) {
event.preventDefault();
toggleSidebar(sidebar, event.target);
});
}
}
// use the 'openSidebar' event to trigger the sidebar
sidebar.element.addEventListener('openSidebar', function(event) {
toggleSidebar(sidebar, event.detail);
});
};
function toggleSidebar(sidebar, target) {
if(Util.hasClass(sidebar.element, sidebar.showClass)) {
sidebar.selectedTrigger = target;
closeSidebar(sidebar);
return;
}
sidebar.selectedTrigger = target;
showSidebar(sidebar);
initSidebarEvents(sidebar);
};
function showSidebar(sidebar) { // mobile layout only
Util.addClass(sidebar.element, sidebar.showClass);
getFocusableElements(sidebar);
Util.moveFocus(sidebar.element);
// change the overflow of the preventScrollEl
if(sidebar.preventScrollEl) sidebar.preventScrollEl.style.overflow = 'hidden';
};
function closeSidebar(sidebar) { // mobile layout only
Util.removeClass(sidebar.element, sidebar.showClass);
sidebar.firstFocusable = null;
sidebar.lastFocusable = null;
if(sidebar.selectedTrigger) sidebar.selectedTrigger.focus();
sidebar.element.removeAttribute('tabindex');
//remove listeners
cancelSidebarEvents(sidebar);
// change the overflow of the preventScrollEl
if(sidebar.preventScrollEl) sidebar.preventScrollEl.style.overflow = '';
};
function initSidebarEvents(sidebar) { // mobile layout only
//add event listeners
sidebar.element.addEventListener('keydown', handleEvent.bind(sidebar));
sidebar.element.addEventListener('click', handleEvent.bind(sidebar));
};
function cancelSidebarEvents(sidebar) { // mobile layout only
//remove event listeners
sidebar.element.removeEventListener('keydown', handleEvent.bind(sidebar));
sidebar.element.removeEventListener('click', handleEvent.bind(sidebar));
};
function handleEvent(event) { // mobile layout only
switch(event.type) {
case 'click': {
initClick(this, event);
}
case 'keydown': {
initKeyDown(this, event);
}
}
};
function initKeyDown(sidebar, event) { // mobile layout only
if( event.keyCode && event.keyCode == 27 || event.key && event.key == 'Escape' ) {
//close sidebar window on esc
closeSidebar(sidebar);
} else if( event.keyCode && event.keyCode == 9 || event.key && event.key == 'Tab' ) {
//trap focus inside sidebar
trapFocus(sidebar, event);
}
};
function initClick(sidebar, event) { // mobile layout only
//close sidebar when clicking on close button or sidebar bg layer
if( !event.target.closest('.js-sidebar__close-btn') && !Util.hasClass(event.target, 'js-sidebar') ) return;
event.preventDefault();
closeSidebar(sidebar);
};
function trapFocus(sidebar, event) { // mobile layout only
if( sidebar.firstFocusable == document.activeElement && event.shiftKey) {
//on Shift+Tab -> focus last focusable element when focus moves out of sidebar
event.preventDefault();
sidebar.lastFocusable.focus();
}
if( sidebar.lastFocusable == document.activeElement && !event.shiftKey) {
//on Tab -> focus first focusable element when focus moves out of sidebar
event.preventDefault();
sidebar.firstFocusable.focus();
}
};
function initSidebarResize(sidebar) {
// custom event emitted when window is resized - detect only if the sidebar--static@{breakpoint} class was added
var beforeContent = getComputedStyle(sidebar.element, ':before').getPropertyValue('content');
if(beforeContent && beforeContent !='' && beforeContent !='none') {
checkSidebarLayout(sidebar);
sidebar.element.addEventListener('update-sidebar', function(event){
checkSidebarLayout(sidebar);
});
}
// check if there a main element to show
var mainContent = document.getElementsByClassName(sidebar.contentReadyClass);
if(mainContent.length > 0) Util.removeClass(mainContent[0], sidebar.contentReadyClass);
Util.addClass(sidebar.element, sidebar.readyClass);
};
function checkSidebarLayout(sidebar) {
var layout = getComputedStyle(sidebar.element, ':before').getPropertyValue('content').replace(/\'|"/g, '');
if(layout == sidebar.layout) return;
sidebar.layout = layout;
if(layout != 'static') Util.addClass(sidebar.element, 'is-hidden');
Util.toggleClass(sidebar.element, sidebar.staticClass + sidebar.customStaticClass, layout == 'static');
if(layout != 'static') setTimeout(function(){Util.removeClass(sidebar.element, 'is-hidden')});
// reset element role
(layout == 'static') ? sidebar.element.removeAttribute('role', 'alertdialog') : sidebar.element.setAttribute('role', 'alertdialog');
// reset mobile behaviour
if(layout == 'static' && Util.hasClass(sidebar.element, sidebar.showClass)) closeSidebar(sidebar);
};
function getFocusableElements(sidebar) {
//get all focusable elements inside the drawer
var allFocusable = sidebar.element.querySelectorAll('[href], input:not([disabled]), select:not([disabled]), textarea:not([disabled]), button:not([disabled]), iframe, object, embed, [tabindex]:not([tabindex="-1"]), [contenteditable], audio[controls], video[controls], summary');
getFirstVisible(sidebar, allFocusable);
getLastVisible(sidebar, allFocusable);
};
function getFirstVisible(sidebar, elements) {
//get first visible focusable element inside the sidebar
for(var i = 0; i < elements.length; i++) {
if( elements[i].offsetWidth || elements[i].offsetHeight || elements[i].getClientRects().length ) {
sidebar.firstFocusable = elements[i];
return true;
}
}
};
function getLastVisible(sidebar, elements) {
//get last visible focusable element inside the sidebar
for(var i = elements.length - 1; i >= 0; i--) {
if( elements[i].offsetWidth || elements[i].offsetHeight || elements[i].getClientRects().length ) {
sidebar.lastFocusable = elements[i];
return true;
}
}
};
window.Sidebar = Sidebar;
//initialize the Sidebar objects
var sidebar = document.getElementsByClassName('js-sidebar');
if( sidebar.length > 0 ) {
for( var i = 0; i < sidebar.length; i++) {
(function(i){new Sidebar(sidebar[i]);})(i);
}
// switch from mobile to static layout
var customEvent = new CustomEvent('update-sidebar');
window.addEventListener('resize', function(event){
(!window.requestAnimationFrame) ? setTimeout(function(){resetLayout();}, 250) : window.requestAnimationFrame(resetLayout);
});
(window.requestAnimationFrame) // init sidebar layout
? window.requestAnimationFrame(resetLayout)
: resetLayout();
function resetLayout() {
for( var i = 0; i < sidebar.length; i++) {
(function(i){sidebar[i].dispatchEvent(customEvent)})(i);
};
};
}
}());
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