Lightbox Responsive et A11Y

Principe de base d'une lightbox accessible, compatible lecteurs d'écran et responsive. Les attributs srcset peuvent être pris en charge.
Toute proposition d'amélioration est bien sûr la bienvenue ! Ça se passe ici : contact

Les ressources

Javascript : /javascript/lightbox.js
Javascript : https://github.com/mattbryson/TouchSwipe-Jquery-Plugin
CSS : /styles/lightbox.css
SVG : ./svg/lightbox.svg

Utilisation

Tout est dans le js... Exemple ici

ou sur l'image suivante

Source Javascript $.lightbox

;(async ($) => { /* utilisation usage sur n'importe quelle balise HTML de la catégorie contenu de flux (https://developer.mozilla.org/fr/docs/Web/Guide/HTML/Catégories_de_contenu#Contenu_de_flux) Exemple: <picture class="lightbox" data-full="//domaine.com/src_image.jpg" title="Lorem ipsum" ou data-title="Lorem ipsum"> Valeurs obligatoires : - classe `lightbox` - attribut data-full (par défaut) modifiable pour gérer plusieurs lightbox dans une même page. La valeur de data-full est la source de l'image en grand format affiché dans la lightbox. [data-full] : string uri OU objet pour images responsives. eg. {"src":"\/image@1000.jpg","srcset":["\/image@400.jpg 400vw","\/image@700.jpg 700vw","\/image@1500.jpg 1500vw"]} - [data-]title non vide Valeurs optionnelles : - classe `lightbox-overlay-trigger` : pose la zone cliquable sur la totalité du bloc. Si absent, le trigger cliquable se positionne en haut à droite du bloc - data-download : définit le lien dans la lightbox vers le téléchargement direct de l'image courante - data-link : définit le lien dans la lightbox vers l'affichage d'une page détaillant l'image courante - data-scroll : contient un identifiant qui permet de faire suivre la page au changement de vue dans la lightbox - data-enable-background : ressources img pour afficher un arrière-plan (flou blur() modifiable dans la CSS) Nécessite en option https://github.com/mattbryson/TouchSwipe-Jquery-Plugin pour la gestion du swipe sur mobile MISC variables utilisées : Un objet `GLOBALS.l18n` (voir source de la page) est nécessaire pour labelliser les attributs aria- Taper console.table(GLOBALS.l18n) sous chrome pour afficher les valeurs DOM = { window: $(window), document: $(document), body: $('body') }; const FOCUSABLE_SELECTORS = 'a[href], area[href], input:not([disabled]), select:not([disabled]), textarea:not([disabled]), button:not([disabled]), [tabindex="0"], [contenteditable]'; const KEYCODES = { BACKSPACE: 8, TAB: 9, ENTER: 13, ESC: 27, SPACE: 32, LEFT: 37, UP: 38, RIGHT: 39, DOWN: 40 }; */ 'use strict'; $.lightbox = function () { let blocs = $('.lightbox[data-full]').filter( function() { // filter for images in owl.carousel loop or others... return $(this).parents('.cloned').length === 0 }); if(typeof $.fn.doOnce !== 'function') { $.fn.doOnce = async function( func ) { this.length && func.apply( this ); return this; }; } if(typeof $.preload !== 'function') { $.preload = function() { let imgs = (Object.prototype.toString.call( arguments[ 0 ]) === '[object Array]' ? arguments[ 0 ] : arguments), tmp = [], i = imgs.length; for(; i--; ) { tmp.push( $('<img />', { 'src': imgs[i] })); } }; } if(typeof $.means !== 'function') { $.means = function(wording) { let sentence = undefined; if(typeof GLOBALS === "object") { sentence = GLOBALS.l18n[wording] || undefined; } return sentence !== undefined ? sentence : wording + ' is not defined in GLOBALS.l10n'; }; } if(blocs.length) { let lbx_timer, placeholder = 'data:image/gif;base64,R0lGODlhCgAKAJECAAAAAP///wAAAAAAACH5BAEAAAIALAAAAAAKAAoAAAIIlI+py+0PYysAOw==', count = blocs.length; if(typeof $.zindex !== 'function') { $.zindex = async function (fromDomNode) { let r = []; $("*", (fromDomNode == null ? DOM.body : fromDomNode )).each( function () { let z = parseInt($(this).css('z-index'), 10); !isNaN(z) && r.push(z) }); let last = r.sort(function (a, b) { return a-b }).reverse()[0]; if(last === undefined) { last = 0; } return last + 1; }; } if(typeof $.scrollTop !== 'function') { $.scrollTop = async function(time) { $('html, body').animate({ scrollTop: (arguments[1] !== undefined ? arguments[1] : 0) }, (isNaN(time) ? 500 : time)); }; } lbx_timer = 0; $('#lightbox').doOnce( function() { this.remove(); }); let classContainer = 'lightbox-container', classTrigger = 'lightbox-trigger', lbx_ = $('<section/>', {'id':'lightbox', 'tabindex': '0', 'style': 'z-index:' + $.zindex()}), lbx_image = $('<img/>', {'alt': '', 'src': placeholder, 'crossorigin': 'anonymous', 'decoding': 'async', 'id': 'lightbox_image'}), lbx_background = $('<span/>', {'id':'lightbox_background'}), lbx_backdrop = $('<span/>', {'id':'lightbox_backdrop'}), lbx_caption = $('<div/>', {'id':'lightbox_caption', 'tabindex': '0'}), lbx_controls = $('<div/>', {'id':'lightbox_control'}), lbx_first = $('<button/>', {'id':'lightbox_first', 'aria-label': $.means('lightbox_first')}), lbx_prev = $('<button/>', {'id':'lightbox_prev', 'aria-label': $.means('lightbox_prev')}), lbx_next = $('<button/>', {'id':'lightbox_next', 'aria-label': $.means('lightbox_next')}), lbx_last = $('<button/>', {'id':'lightbox_last', 'aria-label': $.means('lightbox_last')}), lbx_play = $('<button/>', {'id':'lightbox_play', 'aria-label': $.means('lightbox_play')}), lbx_loading = $('<div/>', {'id':'lightbox_loading'}), lbx_close = $('<button/>', {'id': 'lightbox_close', 'aria-label': $.means('lightbox_close')}), lbx_next_image, lbx_prev_image, lbx_fadeout = async () => { lbx_.fadeOut(), lbx_stop(); $(lbx_.data('opener')).trigger('focus'); }, lbx_autostart = false, lbx_stop = async () => { lbx_autostart = false; lbx_play.removeClass('play'), resetTimer(); }, initTimer = async () => { resetTimer(); lbx_timer = setTimeout(function() { slide(); }, 5000); }, resetTimer = async () => { ( (lbx_timer > 0) && clearTimeout(lbx_timer) ); lbx_timer = 0; }, slide = async () => { $(blocs[lbx_next_image]).parents('.' + classContainer).find('.' + classTrigger).trigger('click'); (lbx_autostart) && initTimer(); }; DOM.body.append(lbx_); lbx_.append( lbx_caption, lbx_close, lbx_image, lbx_loading, lbx_controls ); if(count > 1) { lbx_controls.append(lbx_first, lbx_prev, lbx_play, lbx_next, lbx_last); lbx_.addClass('multi-views'); } lbx_close.on('click', () => { lbx_fadeout(); }); blocs.each( function(index) { let element_ = $(this), parentContainer = element_.parent(); if(!parentContainer.hasClass(classContainer)) { parentContainer.addClass(classContainer); ($.inArray(parentContainer.css('position') , ['absolute', 'relative', 'fixed']) === -1) && parentContainer.addClass('position-relative'); parentContainer.append( $('<button/>') .addClass(classTrigger) .css({'z-index': $.zindex(parentContainer)}) .text($.means('lightbox_trigger')) ); } element_.hasClass('lightbox-overlay-trigger') && parentContainer.addClass('lightbox-overlay'); parentContainer.find('.' + classTrigger).on('click', function (ev) { ev.stopPropagation(); lbx_.data('opener', $(document.activeElement)); parentContainer.tagName().toLowerCase() === 'a' && ev.preventDefault(); // preload images if(element_.data('enable-background') !== undefined) { lbx_.prepend(lbx_background); lbx_background.after(lbx_backdrop); $.preload(element_.data('enable-background')); } else { if(typeof element_.data('full') === 'string') { $.preload([element_.data('enable-background'), element_.data('full')]); } } // ajouter un lien de téléchargement de l'image dans la lightbox // attribut data-download="//lien.download." if(element_.data('download') !== undefined) { lbx_.removeClass('.downloadable').find('.lightbox_download').first().remove(); if(element_.data('download') !== false) { let lbx_download = $('<img/>', { 'alt': '', 'src': placeholder, 'class': 'lightbox_download' }); lbx_.addClass('downloadable'); lbx_caption.before(lbx_download); lbx_download.on('click', () => { lbx_stop(); document.location = element_.data('download'); }); } } // ajouter un lien vers une page détails de l'image // attribut data-link="//lien.vers.longdescription.image" if(element_.data('link') !== undefined) { lbx_.removeClass('.linkable').find('.lightbox_link').first().remove(); if(element_.data('link') !== false) { let lbx_link = $('<a/>', {'href': element_.data('link'), 'class': 'lightbox_link'}); lbx_.addClass('linkable'); lbx_caption.before( lbx_link.text($.means('lightbox_link') )); lbx_link.on('click', () => { lbx_stop(); }); } } (lbx_.is(':hidden')) && ( lbx_.fadeIn(), lbx_play.removeClass('play') ); lbx_next_image = index + 1; (lbx_next_image > count - 1) && (lbx_next_image = 0); lbx_prev_image = index - 1; (lbx_prev_image < 0) && (lbx_prev_image = count - 1); let index_images = $.means('lightbox_enum') + (index + 1) + $.means('lightbox_on') + count, img_caption = element_.attr('title') || element_.attr('data-title') || null; lbx_caption.empty(); (img_caption != null && img_caption.trim().length) && lbx_caption.prepend($('<div/>').text(img_caption)); lbx_controls.attr('data-before', index_images); lbx_image.css({opacity: 0}); lbx_.addClass('loading').css({zIndex: $.zindex()}), lbx_loading.hide(); if(typeof element_.data('full') !== 'string') { let values_ = element_.data('full'); lbx_image.attr({ 'src': values_.src, 'srcset': values_.srcset.join(',') }); } else { lbx_image.attr({ 'src': element_.data('full') }); } lbx_image.on('load', async () => { lbx_.attr({'aria-live': 'assertive', 'aria-modal': 'true'}).focus(); lbx_image.css({maxHeight: 'calc(100% - '+ ( lbx_close.outerHeight() + lbx_controls.outerHeight(true) ) + 'px)'}); lbx_loading.hide(); lbx_image.css({opacity: 1}); lbx_.removeClass('loading'); // ajouter l'image d'arrière plan element_.data('enable-background') !== undefined && lbx_background.css({ backgroundImage: 'url(' + element_.data('enable-background') + ')' }); let scrollToItem = $('[data-scroll="' + element_.data('scroll') + '"]'); scrollToItem.length && $.scrollTop(0, scrollToItem.offset().top.toFixed(0) - element_.outerHeight()); let focusable = lbx_.find(FOCUSABLE_SELECTORS); if (focusable.length) { let start_ = focusable[0], end_ = focusable[focusable.length - 1], focus_ = lbx_ ? lbx_ : start_; focus_.focus(); lbx_.on('keydown', async (event) => { if (event.keyCode === KEYCODES.TAB) { (event.shiftKey && document.activeElement === start_) && ( event.preventDefault(), end_.focus() ); (!event.shiftKey && document.activeElement === end_) && ( event.preventDefault(), start_.focus() ); } }); } if(lbx_autostart) { initTimer() } }); lbx_.on('click', async (e) => { $(e.target).attr('id') === lbx_.attr('id') && lbx_fadeout(); }); }); }); lbx_play.on('click', async () => { lbx_play.toggleClass('play'); if(lbx_autostart) { lbx_autostart = false; resetTimer(); } else { lbx_autostart = true; initTimer(); } }); lbx_image.on('click', async () => { count > 1 ? lbx_next.trigger('click') : (document.fullscreenElement == null ? $.fullScreenOn(document.getElementById('lightbox_image')): ($.fullScreenOff(document.getElementById('lightbox_image')), lbx_.trigger('click'))); }), lbx_first.on('click', async () => { lbx_.is(':visible') && $(blocs[0]).parents('.' + classContainer).find('.' + classTrigger).trigger('click'); lbx_stop(); }), lbx_prev.on('click', async () => { lbx_.is(':visible') && $(blocs[lbx_prev_image]).parents('.' + classContainer).find('.' + classTrigger).trigger('click'); lbx_stop(); }), lbx_next.on('click', async () => { lbx_.is(':visible') && $(blocs[lbx_next_image]).parents('.' + classContainer).find('.' + classTrigger).trigger('click'); lbx_stop(); }), lbx_last.on('click', async () => { lbx_.is(':visible') && $(blocs[count - 1]).parents('.' + classContainer).find('.' + classTrigger).trigger('click'); lbx_stop(); }); if('ontouchstart' in window === false) { DOM.window.on('keyup', async ev => { if(lbx_.is(':visible') && $.inArray(ev.which, [KEYCODES.ESC, KEYCODES.LEFT, KEYCODES.RIGHT]) !== -1) { if(count > 1) { if(ev.which === KEYCODES.RIGHT) { $(blocs[lbx_next_image]).parents('.' + classContainer).find('.' + classTrigger).trigger('click'); } if(ev.which === KEYCODES.LEFT) { $(blocs[lbx_prev_image]).parents('.' + classContainer).find('.' + classTrigger).trigger('click'); } } ev.which === KEYCODES.ESC && lbx_fadeout(); } }); } if(typeof $.fn.swipe === 'function') { if(('ontouchstart' in window === true) && count > 1) { lbx_image.swipe( { swipeLeft:function(event, direction, distance, duration, fingerCount) { if(lbx_.is(':visible')) { $(blocs[lbx_next_image]).parents('.' + classContainer).find('.' + classTrigger).trigger('click'); } }, swipeRight:function(event, direction, distance, duration, fingerCount) { if(lbx_.is(':visible')) { $(blocs[lbx_prev_image]).parents('.' + classContainer).find('.' + classTrigger).trigger('click'); } }, threshold: 100 }); } } else { console.log('need https://github.com/mattbryson/TouchSwipe-Jquery-Plugin'); } } }; DOM.document.ready( async () => { $.lightbox(); }); })(jQuery);

Source CSS

.lightbox-trigger { background-color: transparent; background-image: url('/svg/lightbox.svg#i-zoomin-dark'); background-position: center center !important; background-repeat: no-repeat !important; background-size: 70% 70% !important; border-radius: var(--radius); color: rgba(0, 0) !important; white-space: nowrap; text-overflow: clip; overflow: hidden; min-width: 2.5rem !important; min-height: 2.5rem !important; max-width: 3.75rem; max-height: 3.75rem; height: 4vw; width: 4vw; position: absolute !important; left: 0; top: 0; } .lightbox-overlay .lightbox-trigger { max-width: unset; max-height: unset; } @media (any-hover: hover) { .lightbox-overlay .lightbox-trigger { background-color: var(--default, rgba(100, 40)) !important; background-image: none; top: 0; left: 0; bottom: 0; right: 0; width: 100%; height: auto !important; max-width: 100%; max-height: unset; cursor: zoom-in !important; opacity: 0; -webkit-transition: opacity .2s ease-in-out; -moz-transition: opacity .2s ease-in-out; transition: opacity .2s ease-in-out; } .lightbox-container.lightbox-overlay:hover .lightbox-trigger, .lightbox-container .lightbox-trigger:focus { opacity: .5; } } #lightbox { --lightbox-baseline: 3.125rem; --lightbox-size-icons: 0.875rem; bottom: 0; color: white; display: none; left: 0; position: fixed; right: 0; top: 0; background-color: #000000; outline: none; } #lightbox.loading { background-image: url('/svg/lightbox.svg#i-loader'); background-position: center center; background-size: 2.5625rem 2.5625rem; } #lightbox_background { position: absolute; left: 0; top: 0; width: 100vw; height: 100vh; background-size: cover; background-position: center center; } #lightbox_backdrop { position: absolute; left: 0; top: 0; width: 100vw; height: 100vh; -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); } #lightbox.loading #lightbox_background, #lightbox.loading #lightbox_backdrop { opacity: 0; } #lightbox:not(.loading) #lightbox_background { opacity: .3; } #lightbox:not(.loading) + #lightbox_backdrop { opacity: 1; } #lightbox_caption { top: 0; padding-left: 1.25rem; left: 0; position: absolute; right: var(--lightbox-baseline); } #lightbox.downloadable #lightbox_caption, #lightbox.linkable #lightbox_caption { left: var(--lightbox-baseline); } #lightbox.downloadable.linkable #lightbox_caption { left: calc(var(--lightbox-baseline) * 2); } #lightbox_caption div { line-height: var(--lightbox-baseline); padding-right: 1.875rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; } #lightbox_image { height: auto; width: auto; max-width: calc(100vw - 0.625rem); position: absolute; left: 50%; top: 50%; box-shadow: 0 0 0 1px rgba(200, 20) inset; padding: 1px; -webkit-transform: translate(-50%, -50%); -moz-transform: translate(-50%, -50%); -ms-transform: translate(-50%, -50%); transform: translate(-50%, -50%); } #lightbox.multi-views #lightbox_image { margin-top: -0.625rem; } #lightbox_loading { left: 50%; top: calc(50% - 2rem); line-height: 2rem; position: absolute; display: none; border-radius: var(--radius); -webkit-transform: translate(-50%, -50%); -moz-transform: translate(-50%, -50%); -ms-transform: translate(-50%, -50%); transform: translate(-50%, -50%); } #lightbox_control { position: absolute; display: inline-block; left: 0; right: 0; bottom: 0; padding-top: calc(var(--lightbox-baseline) / 2); min-height: var(--lightbox-baseline); white-space: nowrap; text-align: center; } #lightbox_control:before { content: attr(data-before); position: absolute; top: 0; left: 50%; line-height: calc(var(--lightbox-baseline) / 2); display: inline-block; white-space: nowrap; opacity: .8; font-variant: small-caps; font-size: 0.8125rem; -webkit-transform: translateX(-50%); -moz-transform: translateX(-50%); -ms-transform: translateX(-50%); transform: translateX(-50%); } #lightbox_close { background-image: url('/svg/lightbox.svg#i-close'); background-position: center center; background-color: transparent !important; background-size: var(--lightbox-size-icons) var(--lightbox-size-icons); cursor: pointer; height: var(--lightbox-baseline); width: var(--lightbox-baseline); position: absolute; right: 0; top: 0; } .lightbox_download, .lightbox_link, #lightbox_control button { background-position: center center; height: var(--lightbox-baseline); width: var(--lightbox-baseline); cursor: pointer; } .lightbox_download { position: absolute; top: 0; left: 0; background-size: var(--lightbox-size-icons) var(--lightbox-size-icons); background-color: transparent !important; } .lightbox_link { position: absolute; top: 0; left: 0; background-size: var(--lightbox-size-icons) var(--lightbox-size-icons); color: transparent !important; white-space: nowrap; overflow: hidden; background-color: transparent !important; } .lightbox_download + .lightbox_link { left: var(--lightbox-baseline); } #lightbox_control button { background-size: var(--lightbox-size-icons) var(--lightbox-size-icons); vertical-align: bottom; background-color: transparent !important; } #lightbox_first { background-image: url('/svg/lightbox.svg#i-first'); } #lightbox_prev { background-image: url('/svg/lightbox.svg#i-prev'); } #lightbox_play.play { background-image: url('/svg/lightbox.svg#i-pause'); } #lightbox_play:not(.play) { background-image: url('/svg/lightbox.svg#i-play'); } #lightbox_next { background-image: url('/svg/lightbox.svg#i-next'); } #lightbox_last { background-image: url('/svg/lightbox.svg#i-last'); } .lightbox_download { background-image: url('/svg/lightbox.svg#i-download'); } .lightbox_link { background-image: url('/svg/lightbox.svg#i-linkto'); }

Source SVG

<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> <title>Lightbox icons — Kortic</title> <defs> <style> .fill-lightgray { fill: #e7e7e7 } .fill-green { fill: #1ba39c } .stroke-lightgray { stroke: lightgray } .stroke-green { stroke: #1BA39C } </style> </defs> <symbol id="first" viewBox="0 0 32 32"> <path d="M5.66,0A1.66,1.66,0,0,0,4,1.66H4V30.34A1.66,1.66,0,0,0,5.66,32H8.71a1.66,1.66,0,0,0,1.65-1.66V1.66A1.66,1.66,0,0,0,8.71,0H5.66Z" class="fill-lightgray"/> <path d="M28.15,1.37,27.67.94a2.65,2.65,0,0,0-3.78.13l-.1.11L11,14a2.7,2.7,0,0,0-.21,3.79A2.08,2.08,0,0,0,11,18L23.79,30.82a2.67,2.67,0,0,0,3.77.34l.11-.1.48-.48Z" class="fill-lightgray"/> </symbol> <symbol id="prev" viewBox="0 0 32 32"> <path 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