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var asyncImgClasses = {
// Class name of element that holds the images
asyncImgHolder: 'async-image-holder',
// Class for s appended to holder element
asyncImg: 'async-image',
// Low res image class (loaded first)
lowResClass : 'low-res',
// Appended to new
elements after they're loaded
loadedClass : 'loaded',
};
// data-* attribute keys
var asyncImgDataKeys = {
// Full res
dFullRes : 'data-async-src',
// Low res
dLowRes : 'data-async-src-low',
// Gradient start
// ex. rgba(255, 255, 255, .6)
dGradient : 'data-gradient',
// Gradient end
// ex. rgba(255, 255, 255, .6)
dGradientTo : 'data-gradient-to',
// Class string appended to each image
// ex: 'class-a class-b'
dImgClass : 'data-img-class',
// Image alt
dImgAlt : 'data-alt',
};
// Function loads an image *after* returning it's
element
function loadAsyncImage(src, lowRes, classString, gradient, gradientTo, imgAlt){
var imgEl = new Image();
// Blank gif keeps img element transparent
imgEl.src = 'data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=';
// Add image class strings
imgEl.className = asyncImgClasses.asyncImg + ' ' + (classString || '');
// Appends low-res class(if needed)
if(lowRes) imgEl.className += (' ' + asyncImgClasses.lowResClass);
// Set alt
imgEl.alt = imgAlt || 'Asynchronous image';
// This is a loading element(never appended to the document)
imgLoader = new Image();
// Prepare for when image is loaded
imgLoader.onload = function(){
var linearGradient = '';
// Gradient defaults to the first value being used both from/to
if(gradient) linearGradient = 'linear-gradient(' + gradient + ',' + (gradientTo || gradient) +'),';
// Append real src as background to image element that is returned
imgEl.style.backgroundImage = linearGradient + "url('" + src + "')";
imgEl.className += (' ' + asyncImgClasses.loadedClass);
}
// Load image
imgLoader.src = src;
return imgEl;
}
// Automatically find and load async images
function findAsyncImages(){
var asyncImageHolders = document.getElementsByClassName(asyncImgClasses.asyncImgHolder);
for(var q = 0; q < asyncImageHolders.length; q++){
var asyncWrap = asyncImageHolders[q];
// Get img data
var fullResSrc = asyncWrap.getAttribute(asyncImgDataKeys.dFullRes);
var lowResSrc = asyncWrap.getAttribute(asyncImgDataKeys.dLowRes);
var gradient = asyncWrap.getAttribute(asyncImgDataKeys.dGradient);
var gradientTo = asyncWrap.getAttribute(asyncImgDataKeys.dGradientTo);
var imgClass = asyncWrap.getAttribute(asyncImgDataKeys.dImgClass);
var imgAlt = asyncWrap.getAttribute(asyncImgDataKeys.dImgAlt);
// Remove current background image from wrap
if(lowResSrc || fullResSrc) asyncWrap.style.backgroundImage = 'none';
// Low res
if(lowResSrc)
asyncWrap.appendChild(
loadAsyncImage(lowResSrc, true, imgClass, gradient, gradientTo, imgAlt)
);
// Full res
if(fullResSrc)
asyncWrap.appendChild(
loadAsyncImage(fullResSrc, false, imgClass, gradient, gradientTo, imgAlt)
);
}
}
window.addEventListener('DOMContentLoaded', function(){
console.log('Searching for images to load in elements with class "' + asyncImgClasses.asyncImgHolder + '"')
findAsyncImages();
});
// Various meta keys
const lightboxKeys = {
defaultLightboxLabel: 'swgl-default-lightbox',
dataImgSrc: 'data-swgl-src',
dataImgAlt: 'data-swgl-alt',
dataLightboxLabel: 'data-swgl-label',
};
// Flags for preloading images on either side of image selected
const preload = {
'previous': true,
'next': true,
};
const lightboxStyles = {
ids: {
overlay: 'swgl-overlay',
digitizer: 'swgl-digitizer',
slideWrapper: 'swgl-slide-wrapper',
controls: 'swgl-controls',
},
classes: {
// Overlay active
overlayActive: 'active',
digitizer: 'swgl-digitizer',
// Slide classes
slide: 'swgl-slide',
slideLoaded: 'loaded',
deleteSlide: 'swgl-delete',
activeSlide: 'swgl-active',
leftSlide: 'swgl-left',
rightSlide: 'swgl-right',
centerSlide: 'swgl-center',
slideImg: 'swgl-slide-img',
slideImgLoaded: 'loaded',
slidePortrait: 'portrait',
slideLandscape: 'landscape',
slideCaption: 'swgl-caption',
loadingSpinner: 'swgl-loading-spinner'
}
};
// Delays need to match css transition times (ms)
const animationDelays = {
openOverlay: 250,
closeOverlay: 250,
slideTransition: 500,
};
let lightboxData = {};
const setAllLightboxData = (data)=>{
lightboxData = data;
}
// Deep copies object data and returns that
const getLightboxData = (label)=>{
return JSON.parse( JSON.stringify(lightboxData[label]) );
}
let currentLightboxData = {};
const getCurrentLightboxData = ()=>(
JSON.parse( JSON.stringify(currentLightboxData) )
);
const setCurrentLightboxData = (data)=>{
currentLightboxData = data;
}
const clearCurrentLightboxData = ()=>{
currentLightboxData = {};
}
const getSrcFromCurrentData = (imageIndex)=>(
currentLightboxData.images[imageIndex].src
);
const getImageFromCurrentData = (imageIndex)=>(
getImageData(currentLightboxData, imageIndex)
);
let currentIndex = 0;
const getCurrentIndex = ()=>(
currentIndex
);
const setCurrentIndex = (newIndex)=>{
currentIndex = newIndex;
};
const clearCurrentIndex = ()=>{
currentIndex = 0;
};
const createControls = ()=>{
const controlsEl = document.createElement('div');
controlsEl.id = lightboxStyles.ids.controls;
// Digitizer
const digitizer = document.createElement('div');
digitizer.id = lightboxStyles.ids.digitizer;
digitizer.className = lightboxStyles.classes.digitizer;
digitizer.addEventListener('click', closeLightbox);
controlsEl.appendChild(digitizer);
// Close btn
const closeBtn = document.createElement('button');
closeBtn.innerHTML = '×';
closeBtn.id = 'swgl-close-btn';
closeBtn.className = 'swgl-btn';
closeBtn.addEventListener('click', closeLightbox);
controlsEl.appendChild(closeBtn);
// Prev btn
const prevBtn = document.createElement('button');
prevBtn.innerHTML = '❮';
prevBtn.id = 'swgl-prev-btn';
prevBtn.className = 'swgl-btn swgl-nav-btn';
prevBtn.addEventListener('click', prevSlide);
controlsEl.appendChild(prevBtn);
// Next btn
const nextBtn = document.createElement('button');
nextBtn.innerHTML = '❯';
nextBtn.id = 'swgl-next-btn';
nextBtn.className = 'swgl-btn swgl-nav-btn';
nextBtn.addEventListener('click', nextSlide);
controlsEl.appendChild(nextBtn);
return controlsEl;
};
const createFramework = ()=>{
const overlay = createOverlay();
const slideWrapper = createSlideWrapper();
const controls = createControls();
overlay.appendChild(slideWrapper);
overlay.appendChild(controls);
return overlay;
};
const createLoadingSpinner = ()=>{
const newSpinner = document.createElement('img');
newSpinner.className = lightboxStyles.classes.loadingSpinner;
newSpinner.alt = 'Loading image, please wait';
newSpinner.src = 'data:image/svg+xml,' + loadingSvg;
return newSpinner;
};
const createOverlay = ()=>{
const overlay = document.createElement('div');
overlay.id = lightboxStyles.ids.overlay;
return overlay;
};
const createSlideWrapper = ()=>{
const slideWrapper = document.createElement('div');
slideWrapper.id = lightboxStyles.ids.slideWrapper;
return slideWrapper;
};
// This blank gif is also used in async-images, but I'm putting it here to keep them modular
const blankSrc = 'data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=';
const createSlide = (src, alt)=>{
// Create elements
const newSlide = document.createElement('div');
newSlide.className = lightboxStyles.classes.slide;
// Spinner
const spinnerEl = createLoadingSpinner();
// Img
const newImg = new Image();
newImg.className = (' ' + lightboxStyles.classes.slideImg);
// Starts img element transparent if loading
newImg.src = blankSrc;
// Background loader image
imgLoader = new Image();
// Prepare image loading
imgLoader.onload = function(){
// Remove spinner
spinnerEl.parentNode.removeChild(spinnerEl);
// Switch real image to src
newImg.src = src;
// Fade in img again with real src
newImg.className += (' ' + lightboxStyles.classes.slideImgLoaded);
const isLandscape = (imgLoader.width >= imgLoader.height);
const imgTypeClass = isLandscape ? lightboxStyles.classes.slideLandscape : lightboxStyles.classes.slidePortrait;
newSlide.className += (' ' + lightboxStyles.classes.slideLoaded + ' ' + imgTypeClass);
}
// Load image
imgLoader.src = src;
newSlide.appendChild(newImg);
newSlide.appendChild(spinnerEl);
// Add caption
const newCaption = document.createElement('div');
newCaption.className = lightboxStyles.classes.slideCaption;
newCaption.innerHTML = (alt || 'Lightbox image');
newSlide.appendChild(newCaption);
return newSlide;
};
const selectSlide = (src, dir, alt)=>{
// Declare vars for slide direction
let formerActiveDir;
let newSlideDirClass;
// Slide from left
if(dir < 0) {
formerActiveDir = lightboxStyles.classes.rightSlide;
newSlideDirClass = lightboxStyles.classes.leftSlide;
}
// Slide from right
else if(dir > 0) {
formerActiveDir = lightboxStyles.classes.leftSlide;
newSlideDirClass = lightboxStyles.classes.rightSlide;
}
// Center slide
else {
// Slide any active slides to the left
formerActiveDir = lightboxStyles.classes.centerSlide;
// Make slide invisible to start
newSlideDirClass = lightboxStyles.classes.centerSlide;
}
// Remove any remaining slides
deleteActiveSlides(formerActiveDir);
// Set new slide class to active
const newSlide = createSlide(src, alt);
newSlide.className += (' ' + newSlideDirClass);
// Find slide wrapper
const slideWrapper = document.getElementById(lightboxStyles.ids.slideWrapper);
// Add new slide
slideWrapper.appendChild(newSlide);
// Put in setTimeout to wait for DOM update
setTimeout(() => {
newSlide.className =( newSlide.className.replace(newSlideDirClass, '') + ' ' + lightboxStyles.classes.activeSlide);
}, 0);
};
// Generic navigation function
const genericSlide = (indexDirection)=>{
// Get current data
const currentData = getCurrentLightboxData();
// Get current inds
const currentIndex = getCurrentIndex();
// Build next index
const newIndex = verifyIndex(currentData, currentIndex, indexDirection);
// Update with new index
setCurrentIndex(newIndex);
// Get image data from new index
const img = getImageFromCurrentData(newIndex);
// Render new slide
selectSlide( img.src, (newIndex - currentIndex), img.alt );
// Preload next images
checkImagePreload(currentData, newIndex);
};
const openLightbox = (srcIndex, lightboxLabel) => {
// Retrieve data
const lightboxData = getLightboxData((lightboxLabel || lightboxKeys.defaultLightboxLabel));
// Set which data to use
setCurrentLightboxData(lightboxData);
setCurrentIndex(srcIndex)
// Create new slide
const img = getImageFromCurrentData(srcIndex);
selectSlide(img.src, 0, img.alt);
// Get overlay
let overlay = getOverlay();
// Add active class
overlay.className += (' ' + lightboxStyles.classes.overlayActive);
};
const closeLightbox = () => {
// Clear active data
clearCurrentLightboxData();
clearCurrentIndex();
deleteActiveSlides();
// Hide overlay
const overlay = getOverlay();
overlay.className = overlay.className.replace(new RegExp(lightboxStyles.classes.overlayActive, 'g'), '').trim();
};
const prevSlide = (e) => {
e.preventDefault();
genericSlide(-1);
};
const nextSlide = (e) => {
e.preventDefault();
genericSlide(1);
};
// Preloads images on either side of current
const checkImagePreload = (currentData, currentIndex) => {
if(preload.previous) {
const prevIndex = verifyIndex(currentData, (currentIndex - 1) );
const img = getImageData(currentData, prevIndex);
preloadImage(img.src);
}
if(preload.next) {
const nextIndex = verifyIndex(currentData, (currentIndex + 1));
const img = getImageData(currentData, nextIndex);
preloadImage(img.src);
}
}
// Removes all slides active before navigation
const deleteActiveSlides = (dir)=>{
const slideWrapper = getSlideWrapper();
const dirClass = (dir || lightboxStyles.classes.centerSlide);
// Get all active slides
const currentSlides = slideWrapper.getElementsByClassName(lightboxStyles.classes.activeSlide);
for(let q = 0; q < currentSlides.length; q++){
const oldSlide = currentSlides[q];
// Clear activeClass
oldSlide.className = currentSlides[q].className.replace(lightboxStyles.classes.activeSlide, dirClass);
// Delete old slide
setTimeout(()=>{
if(oldSlide && oldSlide.parentNode) oldSlide.parentNode.removeChild(oldSlide);
}, animationDelays.slideTransition)
}
}
// Retrieval function for image data
const getImageData = (data, index) => {
return data.images[index];
};
// Retrieval function for overlay element
const getOverlay = () => {
return document.getElementById(lightboxStyles.ids.overlay);
};
// Retrieval function for slide wrapper
const getSlideWrapper = () => {
return document.getElementById(lightboxStyles.ids.slideWrapper);
};
// Preloads without showing image
const preloadImage = (src) => {
const img = new Image();
img.alt = 'Preloading image';
img.src = src;
};
// Ensures image index loops around image count
const verifyIndex = (currentData, currentIndex, indexDirection = 0) => {
let attemptedIndex = (currentIndex + indexDirection);
let newIndex;
if(attemptedIndex >= currentData.images.length) newIndex = 0;
else if(attemptedIndex < 0) newIndex = (currentData.images.length - 1);
else newIndex = attemptedIndex;
return newIndex;
};
const genLightboxData = (label)=>({
label,
images: []
});
const genLightboxImage = (src, imgAlt)=>({
src,
alt: (imgAlt || 'Lightbox image')
});
const initializeFramework = ()=>{
const swglLightbox = createFramework();
document.getElementsByTagName('body')[0].appendChild(swglLightbox);
};
const intializeSlides = ()=>{
if(!lightboxKeys.dataImgSrc) throw new Error("lightboxKeys.dataImgSrc var empty");
if(!lightboxKeys.dataLightboxLabel) throw new Error("lightboxKeys.dataLightboxLabel var empty");
if(!lightboxKeys.dataImgAlt) throw new Error('lightboxKeys.dataImgAlt empty');
// Search for lightbox images
const imgSrcEls = document.querySelectorAll('[' + lightboxKeys.dataImgSrc + ']');
// holds final lightbox data
const lightboxData = {};
for(let q = 0; q < imgSrcEls.length; q++){
const imgEl = imgSrcEls[q];
const imgSrc = imgEl.getAttribute(lightboxKeys.dataImgSrc);
const imgAlt = imgEl.getAttribute(lightboxKeys.dataImgAlt);
// Uses element's lightbox label or default
const lightboxLabel = imgEl.getAttribute(lightboxKeys.dataLightboxLabel) || lightboxKeys.defaultLightboxLabel;
const newLightboxImage = genLightboxImage(imgSrc, imgAlt);
// Ensure data is prepped
if(!lightboxData[lightboxLabel]) lightboxData[lightboxLabel] = genLightboxData(lightboxLabel);
// Push new image
lightboxData[lightboxLabel].images.push( newLightboxImage );
const imgIndex = (lightboxData[lightboxLabel].images.length - 1);
imgEl.addEventListener('click', ()=>{
openLightbox(imgIndex, lightboxLabel)
});
}
setAllLightboxData(lightboxData);
}
window.addEventListener('DOMContentLoaded', ()=>{
// Prepare lightbox HTML
initializeFramework();
// Find all slides and initialize lightbox data
intializeSlides();
});
// Unfortunately this adds over a kb to the code,
// the upside being it doesn't take another request
const loadingSvg = '%3Csvg%20viewBox%3D%220%200%20265%20273%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20fill-rule%3D%22evenodd%22%20clip-rule%3D%22evenodd%22%20stroke-linejoin%3D%22round%22%20stroke-miterlimit%3D%221.414%22%3E%3Ccircle%20cx%3D%22188.828%22%20cy%3D%2238.185%22%20r%3D%229.158%22%20transform%3D%22translate(-21.676%20-2.418)%20scale(1.1417)%22%2F%3E%3Ccircle%20cx%3D%22188.828%22%20cy%3D%2238.185%22%20r%3D%229.158%22%20transform%3D%22translate(-8.379%2033.813)%20scale(1.29394)%22%2F%3E%3Ccircle%20cx%3D%22188.828%22%20cy%3D%2238.185%22%20r%3D%229.158%22%20transform%3D%22translate(-21.726%2085.436)%20scale(1.44612)%22%2F%3E%3Ccircle%20cx%3D%22188.828%22%20cy%3D%2238.185%22%20r%3D%229.158%22%20transform%3D%22translate(-65.864%20137.056)%20scale(1.59837)%22%2F%3E%3Ccircle%20cx%3D%22188.828%22%20cy%3D%2238.185%22%20r%3D%229.158%22%20transform%3D%22translate(-136.654%20173.288)%20scale(1.7506)%22%2F%3E%3Ccircle%20cx%3D%22188.828%22%20cy%3D%2238.185%22%20r%3D%229.158%22%20transform%3D%22translate(-222.825%20182.865)%20scale(1.90279)%22%2F%3E%3Ccircle%20cx%3D%22188.828%22%20cy%3D%2238.185%22%20r%3D%229.158%22%20transform%3D%22translate(-309.011%20161.662)%20scale(2.05505)%22%2F%3E%3Ccircle%20cx%3D%22188.828%22%20cy%3D%2238.185%22%20r%3D%229.158%22%20transform%3D%22translate(-379.808%20113.803)%20scale(2.20732)%22%2F%3E%3Ccircle%20cx%3D%22188.828%22%20cy%3D%2238.185%22%20r%3D%229.158%22%20transform%3D%22translate(-423.925%2050.56)%20scale(2.35946)%22%2F%3E%3Ccircle%20cx%3D%22188.828%22%20cy%3D%2238.185%22%20r%3D%229.158%22%20transform%3D%22translate(-437.292%20-12.69)%20scale(2.51175)%22%2F%3E%3Ccircle%20cx%3D%22188.828%22%20cy%3D%2238.185%22%20r%3D%229.158%22%20transform%3D%22translate(-423.993%20-60.546)%20scale(2.66398)%22%2F%3E%3Ccircle%20cx%3D%22188.828%22%20cy%3D%2238.185%22%20r%3D%229.158%22%20transform%3D%22translate(-395.289%20-81.746)%20scale(2.81613)%22%2F%3E%3C%2Fsvg%3E';
If you are using the jQuery library, then don't forget to wrap your code inside jQuery.ready() as follows:
jQuery(document).ready(function( $ ){
// Your code in here
});
--
If you want to link a JavaScript file that resides on another server (similar to
), then please use
the "Add HTML Code" page, as this is a HTML code that links a JavaScript file.
End of comment */
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