var Lightbox = { init: function (options) { this.options = $extend({ resizeDuration: 400, resizeTransition: false, initialWidth: 250, initialHeight: 250, animateCaption: true, showCounter: true }, options || {}); this.anchors = []; $each(document.links, function (el) { if (el.rel && el.rel.test(/^lightbox/i)) { el.onclick = this.click.pass(el, this); this.anchors.push(el); } }, this); this.eventKeyDown = this.keyboardListener.bindAsEventListener(this); this.eventPosition = this.position.bind(this); this.overlay = new Element('div', { 'id': 'lbOverlay' }).injectInside(document.body); this.center = new Element('div', { 'id': 'lbCenter', 'styles': { 'width': this.options.initialWidth, 'height': this.options.initialHeight, 'marginLeft': -(this.options.initialWidth / 2), 'display': 'none'} }).injectInside(document.body); this.image = new Element('div', { 'id': 'lbImage' }).injectInside(this.center); this.prevLink = new Element('a', { 'id': 'lbPrevLink', 'href': '#', 'styles': { 'display': 'none'} }).injectInside(this.image); this.nextLink = this.prevLink.clone().setProperty('id', 'lbNextLink').injectInside(this.image); this.prevLink.onclick = this.previous.bind(this); this.nextLink.onclick = this.next.bind(this); this.bottomContainer = new Element('div', { 'id': 'lbBottomContainer', 'styles': { 'display': 'none'} }).injectInside(document.body); this.bottom = new Element('div', { 'id': 'lbBottom' }).injectInside(this.bottomContainer); new Element('a', { 'id': 'lbCloseLink', 'href': '#' }).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this); this.caption = new Element('div', { 'id': 'lbCaption' }).injectInside(this.bottom); this.number = new Element('div', { 'id': 'lbNumber' }).injectInside(this.bottom); new Element('div', { 'styles': { 'clear': 'both'} }).injectInside(this.bottom); var nextEffect = this.nextEffect.bind(this); this.fx = { overlay: this.overlay.effect('opacity', { duration: 500 }).hide(), resize: this.center.effects($extend({ duration: this.options.resizeDuration, onComplete: nextEffect }, this.options.resizeTransition ? { transition: this.options.resizeTransition} : {})), image: this.image.effect('opacity', { duration: 500, onComplete: nextEffect }), bottom: this.bottom.effect('margin-top', { duration: 400, onComplete: nextEffect }) }; this.preloadPrev = new Image(); this.preloadNext = new Image(); }, click: function (link) { if (link.rel.length == 8) return this.show(link.href, link.title); var j, imageNum, images = []; this.anchors.each(function (el) { if (el.rel == link.rel) { for (j = 0; j < images.length; j++) if (images[j][0] == el.href) break; if (j == images.length) { images.push([el.href, el.title]); if (el.href == link.href) imageNum = j; } } }, this); return this.open(images, imageNum); }, show: function (url, title) { return this.open([[url, title]], 0); }, open: function (images, imageNum) { this.images = images; this.position(); this.setup(true); this.top = window.getScrollTop() + (window.getHeight() / 15); this.center.setStyles({ top: this.top, display: '' }); this.fx.overlay.start(0.8); return this.changeImage(imageNum); }, position: function () { this.overlay.setStyles({ 'top': window.getScrollTop(), 'height': window.getHeight() }); }, setup: function (open) { var elements = $A(document.getElementsByTagName('object')); elements.extend(document.getElementsByTagName(window.ie ? 'select' : 'embed')); elements.each(function (el) { if (open) el.lbBackupStyle = el.style.visibility; el.style.visibility = open ? 'hidden' : el.lbBackupStyle; }); var fn = open ? 'addEvent' : 'removeEvent'; window[fn]('scroll', this.eventPosition)[fn]('resize', this.eventPosition); document[fn]('keydown', this.eventKeyDown); this.step = 0; }, keyboardListener: function (event) { switch (event.keyCode) { case 27: case 88: case 67: this.close(); break; case 37: case 80: this.previous(); break; case 39: case 78: this.next(); } }, previous: function () { return this.changeImage(this.activeImage - 1); }, next: function () { return this.changeImage(this.activeImage + 1); }, changeImage: function (imageNum) { if (this.step || (imageNum < 0) || (imageNum >= this.images.length)) return false; this.step = 1; this.activeImage = imageNum; this.bottomContainer.style.display = this.prevLink.style.display = this.nextLink.style.display = 'none'; this.fx.image.hide(); this.center.className = 'lbLoading'; this.preload = new Image(); this.preload.onload = this.nextEffect.bind(this); this.preload.src = this.images[imageNum][0]; return false; }, nextEffect: function () {
    switch (this.step++) {
        case 1: this.center.className = ''; this.image.style.backgroundImage = 'url(' + this.images[this.activeImage][0] + ')'; this.image.style.width = this.bottom.style.width = this.preload.width + 'px'; this.image.style.height = this.prevLink.style.height = this.nextLink.style.height = this.preload.height + 'px'; this.caption.setHTML(this.images[this.activeImage][1] || ''); this.number.setHTML((!this.options.showCounter || (this.images.length == 1)) ? '' : 'Image ' + (this.activeImage + 1) + ' of ' + this.images.length); if (this.activeImage) this.preloadPrev.src = this.images[this.activeImage - 1][0]; if (this.activeImage != (this.images.length - 1)) this.preloadNext.src = this.images[this.activeImage + 1][0]; if (this.center.clientHeight != this.image.offsetHeight) { this.fx.resize.start({ height: this.image.offsetHeight }); break; }
            this.step++; case 2: if (this.center.clientWidth != this.image.offsetWidth) { this.fx.resize.start({ width: this.image.offsetWidth, marginLeft: -this.image.offsetWidth / 2 }); break; }
            this.step++; case 3: this.bottomContainer.setStyles({ top: this.top + this.center.clientHeight, height: 0, marginLeft: this.center.style.marginLeft, display: '' }); this.fx.image.start(1); break; case 4: if (this.options.animateCaption) { this.fx.bottom.set(-this.bottom.offsetHeight); this.bottomContainer.style.height = ''; this.fx.bottom.start(0); break; }
            this.bottomContainer.style.height = ''; case 5: if (this.activeImage) this.prevLink.style.display = ''; if (this.activeImage != (this.images.length - 1)) this.nextLink.style.display = ''; this.step = 0;
    } 
}, close: function () {
    if (this.step < 0) return; this.step = -1; if (this.preload) { this.preload.onload = Class.empty; this.preload = null; }
    for (var f in this.fx) this.fx[f].stop(); this.center.style.display = this.bottomContainer.style.display = 'none'; this.fx.overlay.chain(this.setup.pass(false, this)).start(0); return false;
} 
}; window.addEvent('domready', Lightbox.init.bind(Lightbox));