Lightbox Responsive a11y (accessible) jQuery
Principe de base d'une lightbox accessible, compatible lecteurs d'écran et responsive. Les attributs srcset peuvent être pris en charge.
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Les ressources
Source Javascript $.lightbox
/*******************************************************************
* JS [pretty source] file updated on Sat, 17 Aug 2019 11:15:27 +0200
* File https://www.kortic.com/v2.lightbox.js
*******************************************************************/
/* 15_lightbox.js**************************************************/
;(function($) {
/* 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">
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"]}
- title non vide
Point d'attention : un objet `means[lang]` est nécessaire pour labelliser les attributs aria-
means = {
'fr' : {
'lightbox_close': 'Fermer',
'lightbox_first': 'Aller à la première image',
'lightbox_prev': 'Image précédente',
'lightbox_play': 'Démarrer ou arrêter le diaporama',
'lightbox_next': 'Image suivante',
'lightbox_last': 'Aller à la dernière image',
'lightbox_download': 'Télécharger l\'image',
'lightbox_enum': 'image ',
'lightbox_on': ' sur ',
}
};
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
Nécessite en option https://github.com/mattbryson/TouchSwipe-Jquery-Plugin pour la gestion du swipe sur mobile
*/
'use strict';
$.lightbox = function(){
var 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 = function( func ) {
this.length && func.apply( this );
return this;
};
}
if(blocs.length) {
var lbx_timer,
lbx_viewTimer,
placeholder = 'data:image/gif;base64,R0lGODlhCgAKAJECAAAAAP///wAAAAAAACH5BAEAAAIALAAAAAAKAAoAAAIIlI+py+0PYysAOw==',
count = blocs.length;
if(typeof $.zindex !== 'function') {
$.zindex = function (fromDomNode) {
let r = [];
$("*", (fromDomNode == null ? $('body') : fromDomNode )).each(function () {
let z = parseInt($(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 = function(time) {
$('html, body').animate({
scrollTop: (arguments[1] !== undefined ? arguments[1] : 0)
}, (isNaN(time) ? 500 : time));
};
}
lbx_timer = 0;
$('#lightbox').doOnce(function(){
$('#lightbox').remove();
});
var classContainer = 'lightbox-container',
classTrigger = 'lightbox-trigger',
lbx_ = $('<section/>', {'id':'lightbox', 'tabindex': '0', 'style': 'z-index:' + $.zindex()}),
lbx_image = $('<img/>', {'alt': '', 'src': placeholder, 'crossorigin': 'use-credentials', 'decoding': 'async', 'id': 'lightbox_image'}),
lbx_caption = $('<div/>', {'id':'lightbox_caption', 'tabindex': '0'}),
lbx_controls = $('<div/>', {'id':'lightbox_control'}),
lbx_first = $('<button/>', {'id':'lightbox_first', 'aria-label': means[lang].lightbox_first}),
lbx_prev = $('<button/>', {'id':'lightbox_prev', 'aria-label': means[lang].lightbox_prev}),
lbx_next = $('<button/>', {'id':'lightbox_next', 'aria-label': means[lang].lightbox_next}),
lbx_last = $('<button/>', {'id':'lightbox_last', 'aria-label': means[lang].lightbox_last}),
lbx_play = $('<button/>', {'id':'lightbox_play', 'aria-label': means[lang].lightbox_play}),
lbx_loading = $('<div/>', {'id':'lightbox_loading'}),
lbx_close = $('<button/>', {'id': 'lightbox_close', 'aria-label': means[lang].lightbox_close}),
lbx_next_image, lbx_prev_image,
lbx_fadeout = function(){
lbx_.fadeOut(),
lbx_stop();
},
lbx_autostart = false,
lbx_stop = () => {
lbx_autostart = false;
lbx_play.removeClass('play'),
resetTimer();
},
initTimer = () => {
resetTimer();
lbx_timer = setTimeout(function(){
slide();
}, 5000);
},
resetTimer = () => {
( (lbx_timer > 0) && clearTimeout(lbx_timer) );
lbx_timer = 0;
},
slide = () => {
$(blocs[lbx_next_image]).parents('.' + classContainer).find('.' + classTrigger).trigger('click');
(lbx_autostart) && initTimer();
};
$('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');
} else {
lbx_controls.css({'display': 'none'});
}
lbx_close.on('click', () => {
lbx_fadeout();
});
blocs.each(function(index){
var 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($('<span/>').addClass(classTrigger).attr({'tabindex': '0', 'focusable': 'true', 'data-event': 'click'}));
}
element_.hasClass('lightbox-overlay-trigger') && parentContainer.addClass('lightbox-overlay');
parentContainer.find('.' + classTrigger).on('click', ev => {
ev.stopPropagation();
parentContainer.tagName().toLowerCase() == 'a' && ev.preventDefault();
// 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 de téléchargement de l'image dans la lightbox
// 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 = $('<img/>', {'alt': '', 'src': placeholder, 'class': 'lightbox_link'});
lbx_.addClass('linkable');
lbx_caption.before(lbx_link);
lbx_link.on('click', () => {
lbx_stop();
document.location = element_.data('link');
});
}
}
(lbx_.is(':hidden')) && (
lbx_.fadeIn(),
lbx_play.removeClass('play')
);
lbx_next_image = index + 1;
(lbx_next_image > count - 1) && (lbx_next_image = 0);
lbx_prev_image = index - 1;
(lbx_prev_image < 0) && (lbx_prev_image = count - 1);
var index_images = means[lang].lightbox_enum + (index + 1) + means[lang].lightbox_on + count,
img_caption = element_.attr('title') || null;
lbx_caption.empty();
(img_caption != null && img_caption.trim().length) && lbx_caption.prepend($('<div/>').text(img_caption));
lbx_controls.attr('data-before', index_images);
lbx_image.animate({opacity: 0}, 300, () => {
lbx_.addClass('loading').css({zIndex: $.zindex()}),
lbx_loading.fadeIn(50);
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', () => {
lbx_.attr({'aria-live': 'assertive', 'aria-modal': 'true'}).focus();
lbx_image.css({maxHeight: 'calc(100% - '+ ( lbx_close.outerHeight(true) + lbx_controls.outerHeight(true) ) + 'px)'});
lbx_loading.hide();
lbx_image.animate({opacity: 1}, 800, function() {
lbx_.removeClass('loading');
}).dequeue();
let scrollToItem = $('[data-scroll="' + element_.data('scroll') + '"]');
scrollToItem.length && $.scrollTop(0, scrollToItem.offset().top.toFixed(0) - element_.outerHeight());
if(lbx_autostart) {
initTimer()
}
});
lbx_.on('click', e => {
$(e.target).attr('id') === lbx_.attr('id') && lbx_fadeout();
});
}).dequeue();
});
});
lbx_play.on('click', () => {
lbx_play.toggleClass('play');
if(lbx_autostart) {
lbx_autostart = false;
resetTimer();
} else {
lbx_autostart = true;
initTimer();
}
});
lbx_image.on('click', () => {
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', () => {
lbx_.is(':visible') && $(blocs[0]).parents('.' + classContainer).find('.' + classTrigger).trigger('click');
lbx_stop();
}),
lbx_prev.on('click', () => {
lbx_.is(':visible') && $(blocs[lbx_prev_image]).parents('.' + classContainer).find('.' + classTrigger).trigger('click');
lbx_stop();
}),
lbx_next.on('click', () => {
lbx_.is(':visible') && $(blocs[lbx_next_image]).parents('.' + classContainer).find('.' + classTrigger).trigger('click');
lbx_stop();
}),
lbx_last.on('click', () => {
lbx_.is(':visible') && $(blocs[count - 1]).parents('.' + classContainer).find('.' + classTrigger).trigger('click');
lbx_stop();
});
if('ontouchstart' in window === false) {
lbx_.addClass('device-desktop');
$(window).on('keyup', function (ev) {
if(lbx_.is(':visible') && $.inArray(ev.which, [27, 37, 39]) !== -1) {
if(count > 1) {
if(ev.which === 39) {
$(blocs[lbx_next_image]).parents('.' + classContainer).find('.' + classTrigger).trigger('click');
}
if(ev.which === 37) {
$(blocs[lbx_prev_image]).parents('.' + classContainer).find('.' + classTrigger).trigger('click');
}
}
ev.which === 27 && 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');
}
}
};
$(document).ready(function(){
$.lightbox();
});
})(jQuery);
Utilisation
<img decoding="async"
class="lightbox lightbox-overlay-trigger"
title="Berlin, Potsdamer Platz"
data-link="https://www.kortic.com/photo-berlin-potsdamer-platz.html"
data-full="https://www.kortic.com/images/full/1000/1/15399291417640_Fjb0S6N1P.jpg"
alt="image Berlin-Potsdamer-Platz"
src="https://www.kortic.com/images/thumb/420/0/15399291417640_Fjb0S6N1P.jpg"
/>
Source CSS
@charset "UTF-8";
/********************************************************************
* CSS [pretty source] file updated on Sat, 17 Aug 2019 11:15:28 +0200
* File https://www.kortic.com/v2.lightbox.css
********************************************************************/
/* 50_lightbox.css**************************************************/
.lightbox-trigger {
background-image:url('/svg/lightbox-xlink.svg#i-zoomin');
background-position: center center !important;
background-repeat: no-repeat !important;
background-color: rgba(0,0,0,0.5);
background-size: 1.875rem 1.875rem !important;
border-radius: var(--radius);
width: 2.5rem !important;
height: 2.5rem !important;
position: absolute !important;
left: 0.3125rem;
top: 0.3125rem;
}
html.a11y .lightbox-trigger {
background-color: black;
}
html:not(.a11y) .device-desktop .lightbox-overlay .lightbox-trigger {
top: 0;
left: 0;
bottom: 0;
right: 0;
width: auto !important;
height: auto !important;
cursor: zoom-in !important;
opacity: 0;
}
html:not(.a11y) .device-desktop .lightbox-trigger {
cursor: pointer !important;
}
html:not(.a11y) .device-desktop .lightbox-container.lightbox-overlay:hover .lightbox-trigger {
background-color: rgba(0,0,0,0.2);
opacity: 1;
}
.lightbox-container .lightbox-trigger:focus {
background-color: rgba(0,0,0,0.9);
opacity: 1 !important;
}
#lightbox {
bottom: 0;
color: white;
display: none;
left: 0;
position: fixed;
right: 0;
top: 0;
}
html:not(.a11y) #lightbox {
background-color: rgba(15,15,15,0.97);
}
html.a11y #lightbox {
background-color: rgba(15,15,15,1);
}
#lightbox.loading {
background-image: url('/svg/lightbox-xlink.svg#i-loader');
background-position: center center;
background-size: 1.875rem 1.875rem;
}
#lightbox_caption {
top: 0;
left: 1.25rem;
position: absolute;
right: 3.4375rem;
}
#lightbox.downloadable #lightbox_caption, #lightbox.linkable #lightbox_caption {
left: 3.4375rem;
}
#lightbox.downloadable.linkable #lightbox_caption {
left: 6.875rem;
}
#lightbox_caption div {
line-height: 3.125rem;
white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
#lightbox_image {
height: auto;
width: auto;
max-width: calc(100% - 2.5rem);
position: absolute;
left: 50%;
top: 50%;
background-color: rgba(255,255,255,0.1);
padding: 1px;
border-radius: var(--radius);
-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: -0.9375rem;
}
#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: 50%;
bottom: 0;
padding-top: 1.875rem;
min-height: 3.125rem;
white-space: nowrap;
-webkit-transform:translateX(-50%);-moz-transform:translateX(-50%);-ms-transform:translateX(-50%);transform:translateX(-50%);
}
#lightbox_control:before {
content: attr(data-before);
position: absolute;
top: 0;
left: 50%;
line-height: 1.875rem;
opacity: .6;
display: inline-block;
white-space: nowrap;
-webkit-transform:translateX(-50%);-moz-transform:translateX(-50%);-ms-transform:translateX(-50%);transform:translateX(-50%);
}
#lightbox_close {
background-image: url('/svg/lightbox-xlink.svg#i-close');
background-position: center center;
background-color: rgba(0,0,0,0) !important;
background-size: 1.5625rem 1.5625rem;
cursor: pointer;
height: 3.125rem;
width: 3.75rem;
position: absolute;
right: 0;
top: 0;
}
.lightbox_download, .lightbox_link, #lightbox_control button {
background-position: center center;
height: 3.125rem;
width: 3.125rem;
cursor: pointer;
}
.lightbox_download {
position: absolute;
top: 0;
left: 0;
background-size: 1.5rem 1.5rem;
}
.lightbox_link {
position: absolute;
top: 0;
left: 0;
background-size: 1.25rem 1.25rem;
}
.lightbox_download + .lightbox_link {
left: 3.125rem;
}
#lightbox_control button {
background-size: 2.5rem 2.5rem;
vertical-align: bottom;
background-color: rgba(0,0,0,0) !important;
}
#lightbox_first {
background-image: url('/svg/lightbox-xlink.svg#i-first');
}
#lightbox_prev {
background-image: url('/svg/lightbox-xlink.svg#i-prev');
}
#lightbox_play.play {
background-image: url('/svg/lightbox-xlink.svg#i-pause');
}
#lightbox_play:not(.play) {
background-image: url('/svg/lightbox-xlink.svg#i-play');
}
#lightbox_next {
background-image: url('/svg/lightbox-xlink.svg#i-next');
}
#lightbox_last {
background-image: url('/svg/lightbox-xlink.svg#i-last');
}
.lightbox_download {
background-image: url('/svg/lightbox-xlink.svg#i-download');
}
.lightbox_link {
background-image: url('/svg/lightbox-xlink.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">
<symbol id="first" viewBox="0 0 32 32">
<path fill='white' d='M12.38,9.85a.63.63,0,0,0-.63.63V21.33a.63.63,0,0,0,.63.63h1.16a.63.63,0,0,0,.63-.63V10.48a.63.63,0,0,0-.63-.63Z'/>
<path fill='white' d='M20.88,10.46l-.18-.16a1,1,0,0,0-1.45.09l-4.77,4.77a1,1,0,0,0,0,1.49l4.77,4.77a1,1,0,0,0,1.45.09l.18-.18Z'/>
</symbol>
<symbol id="prev" viewBox="0 0 32 32">
<path fill='white' d='M15.39,16.65a1.08,1.08,0,0,1,0-1.53c1.21-1.21,2.41-2.41,3.62-3.6A.82.82,0,0,0,19,10.31l-.18-.17a1,1,0,0,0-1.49.09l-4.89,4.89a1.08,1.08,0,0,0,0,1.53l4.89,4.89a1,1,0,0,0,1.49.09l.18-.18a.8.8,0,0,0,.05-1.2C17.79,19.06,16.6,17.84,15.39,16.65Z'/>
</symbol>
<symbol id="play" viewBox="0 0 32 32">
<path fill='white' d='M14.66,10.14a.62.62,0,0,0-1,.49V21.37a.62.62,0,0,0,.35.56.63.63,0,0,0,.27.06.62.62,0,0,0,.38-.13l6.79-5.37a.62.62,0,0,0,0-1Z'/>
</symbol>
<symbol id="pause" viewBox="0 0 32 32">
<circle fill='white' cx='16' cy='16' r='12'/>
<path d='M13,9.85a.62.62,0,0,0-.62.62v10.7a.62.62,0,0,0,.62.62h1.15a.62.62,0,0,0,.62-.62V10.47a.62.62,0,0,0-.62-.62Z'/>
<path d='M17.88,9.85a.62.62,0,0,0-.62.62v10.7a.62.62,0,0,0,.62.62H19a.62.62,0,0,0,.62-.62V10.47A.62.62,0,0,0,19,9.85Z'/>
</symbol>
<symbol id="next" viewBox="0 0 32 32">
<path fill='white' d='M16.65,15.35a1.08,1.08,0,0,1,0,1.53c-1.21,1.21-2.41,2.41-3.62,3.6a.82.82,0,0,0,.05,1.21l.18.17a1,1,0,0,0,1.49-.09l4.89-4.89a1.08,1.08,0,0,0,0-1.53l-4.89-4.89a1,1,0,0,0-1.49-.09l-.18.18a.8.8,0,0,0-.05,1.2C14.25,12.94,15.44,14.16,16.65,15.35Z'/>
</symbol>
<symbol id="last" viewBox="0 0 32 32">
<path fill='white' d='M19.62,22.15a.63.63,0,0,0,.63-.63V10.67a.63.63,0,0,0-.63-.63H18.46a.63.63,0,0,0-.63.63V21.52a.63.63,0,0,0,.63.63Z'/>
<path fill='white' d='M11.12,21.54l.18.16a1,1,0,0,0,1.45-.09l4.77-4.77a1,1,0,0,0,0-1.49l-4.77-4.77a1,1,0,0,0-1.45-.09l-.18.18Z'/>
</symbol>
<symbol id="close" viewBox="0 0 32 32">
<path fill='white' d='M25.333 5.333q0.573 0 0.953 0.38t0.38 0.953q0 0.563-0.385 0.948l-8.396 8.385 8.396 8.385q0.385 0.385 0.385 0.948 0 0.573-0.38 0.953t-0.953 0.38q-0.563 0-0.948-0.385l-8.385-8.396-8.385 8.396q-0.385 0.385-0.948 0.385-0.573 0-0.953-0.38t-0.38-0.953q0-0.563 0.385-0.948l8.396-8.385-8.396-8.385q-0.385-0.385-0.385-0.948 0-0.573 0.38-0.953t0.953-0.38q0.563 0 0.948 0.385l8.385 8.396 8.385-8.396q0.385-0.385 0.948-0.385z'/>
</symbol>
<symbol id="download" viewBox="0 0 32 32">
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