codice:
var Lightbox = {
init: function(options){
this.options = Object.extend({
resizeDuration: 400,
resizeTransition: Fx.Transitions.sineInOut,
initialWidth: 250,
initialHeight: 250,
animateCaption: true,
defaultIframeWidth : 500,
defaultIframeHeight: 300
}, options || {});
// IE 6 - XML prolog problem
if(window.ie6 && document.compatMode=="BackCompat"){
this.options.animateCaption = false;
}
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);
/* Build float panel
<div id="lbOverlay"></div>
<div id="lbCenter">
<div id="lbCanvas">
<a id="lbPrevLink"></a>
<a id="lbNextLink"></a>
</div>
</div>
<div id="lbBottomContainer">
<div id="lbBottom">
<a id="lbCloseLink"></a>
<div id="lbCaption"></div>
<div id="lbNumber"></div>
<div style="clear:both;"></div>
</div>
</div>
*/
this.overlay = new Element('div').setProperty('id', 'lbOverlay').injectInside(document.body);
this.center = new Element('div').setProperty('id', 'lbCenter').setStyles({width: this.options.initialWidth+'px', height: this.options.initialHeight+'px', marginLeft: '-'+(this.options.initialWidth/2)+'px', display: 'none'}).injectInside(document.body);
this.canvas = new Element('div').setProperty('id', 'lbCanvas').injectInside(this.center);
this.prevLink = new Element('a').setProperties({id: 'lbPrevLink', href: '#'}).setStyle('display', 'none').injectInside(this.canvas);
this.nextLink = this.prevLink.clone().setProperty('id', 'lbNextLink').injectInside(this.canvas);
this.prevLink.onclick = this.previous.bind(this);
this.nextLink.onclick = this.next.bind(this);
this.bottomContainer = new Element('div').setProperty('id', 'lbBottomContainer').setStyle('display', 'none').injectInside(document.body);
this.bottom = new Element('div').setProperty('id', 'lbBottom').injectInside(this.bottomContainer);
new Element('a').setProperties({id: 'lbCloseLink', href: '#'}).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);
this.caption = new Element('div').setProperty('id', 'lbCaption').injectInside(this.bottom);
this.number = new Element('div').setProperty('id', 'lbNumber').injectInside(this.bottom);
new Element('div').setStyle('clear', 'both').injectInside(this.bottom);
/* Build effects */
var nextEffect = this.nextEffect.bind(this);
this.fx = {
overlay: this.overlay.effect('opacity', {duration: 500}).hide(),
resizeCenter: this.center.effects({duration: this.options.resizeDuration, transition: this.options.resizeTransition, onComplete: nextEffect}),
image: this.canvas.effect('opacity', {duration: 500, onComplete: nextEffect}),
bottom: this.bottomContainer.effect('height', {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, link.rev);
var j, itemNumber, items = [];
this.anchors.each(function(el){
if (el.rel == link.rel){
for (j = 0; j < items.length; j++) if(items[j][0] == el.href && items[j][2] == el.rev) break;
if (j == items.length){
items.push([el.href, el.title, el.rev]);
if (el.href == link.href && el.rev == link.rev) itemNumber = j;
}
}
}, this);
return this.open(items, itemNumber);
},
show: function(url, title, rev){
return this.open([[url, title, rev]], 0);
},
open: function(items, itemNumber){
this.items = items;
this.position();
this.setup(true);
var wh = (window.getHeight() == 0) ? window.getScrollHeight() : window.getHeight();
var st = document.body.scrollTop || document.documentElement.scrollTop;
this.top = st + (wh / 15);
this.center.setStyles({top: this.top+'px', display: ''});
this.fx.overlay.start(0.8);
return this.changeItem(itemNumber);
},
position: function(){
//IE6 - XML prolog problem.
var ww = (window.getWidth() == 0) ? window.getScrollWidth()-22 : window.getWidth();
var wh = (window.getHeight() == 0) ? window.getScrollHeight() : window.getHeight();
var st = document.body.scrollTop || document.documentElement.scrollTop;
this.overlay.setStyles({top: st+'px', height: wh+'px', width:ww+'px'});
},
setup: function(open){
var elements = $A(document.getElementsByTagName('object'));
if (window.ie) elements.extend(document.getElementsByTagName('select'));
elements.each(function(el){ el.style.visibility = open ? 'hidden' : ''; });
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.changeItem(this.activeItem-1);
},
next: function(){
return this.changeItem(this.activeItem+1);
},
changeItem: function(itemNumber){
if (this.step || (itemNumber < 0) || (itemNumber >= this.items.length)) return false;
this.step = 1;
this.activeItem = itemNumber;
this.bottomContainer.style.display = this.prevLink.style.display = this.nextLink.style.display = 'none';
this.fx.image.hide();
this.center.className = 'lbLoading';
// discard previous content by clicking
this.removeCurrentItem();
// check item type
var url = this.items[this.activeItem][0];
var rev = this.items[this.activeItem][2];
var re_imageURL = /\.(jpe?g|png|gif|bmp)/i;
if( url.match(re_imageURL) ) {
this.preload = new Image(); // JavaScript native Object
this.preload.datatype = 'image';
this.preload.w = this.matchOrDefault(rev, new RegExp("width=(\\d+%?)", "i"), -1); //-1 if use original size.
this.preload.h = this.matchOrDefault(rev, new RegExp("height=(\\d+%?)", "i"), -1);
this.preload.onload = this.nextEffect.bind(this);
this.preload.src = url;
}else{
this.preload = new Object (); // JavaScript native Object
this.preload.datatype = 'iframe';
this.preload.w = this.matchOrDefault(rev, new RegExp("width=(\\d+)", "i"), this.options.defaultIframeWidth);
this.preload.h = this.matchOrDefault(rev, new RegExp("height=(\\d+)", "i"), this.options.defaultIframeHeight);
this.preload.src = url;
this.nextEffect(); //asynchronous loading
}
return false;
},
nextEffect: function(){
switch (this.step++){
case 1:
this.center.className = '';
// create HTML element
if( this.preload.datatype == 'image' ) {
var ws = (this.preload.w == -1) ? this.preload.width.toString() : this.preload.w.toString();
var hs = (this.preload.h == -1) ? this.preload.height.toString() : this.preload.h.toString();
this.p_width = ( q = ws.match(/(\d+)%/) ) ? q[1] * this.preload.width * 0.01 : ws;
this.p_height = ( q = hs.match(/(\d+)%/) ) ? q[1] * this.preload.height * 0.01 : hs;
new Element('img').setProperties({id: 'lbImage', src:this.preload.src, width:this.p_width, height:this.p_height}).injectInside(this.canvas);
this.nextLink.style.right = '';
}else{
this.p_width = this.preload.w;
this.p_height = this.preload.h;
// Safari would not update iframe content that has static id.
this.iframeId = "lbFrame_"+new Date().getTime();
new Element('iframe').setProperties({id: this.iframeId, width: this.p_width, height: this.p_height, frameBorder:0, scrolling:'yes', src:this.preload.src}).injectInside(this.canvas);
this.nextLink.style.right = '25px';
}
this.canvas.style.width = this.bottom.style.width = this.p_width+'px';
this.canvas.style.height = this.prevLink.style.height = this.nextLink.style.height = this.p_height+'px';
this.caption.setHTML(this.items[this.activeItem][1] || '');
this.number.setHTML( (this.items.length == 1) ? '' : 'Page ' + (this.activeItem+1) + ' of ' + this.items.length );
if (this.activeItem) this.preloadPrev.src = this.items[this.activeItem-1][0];
if (this.activeItem != (this.items.length - 1)) this.preloadNext.src = this.items[this.activeItem+1][0];
if (this.center.clientHeight != this.canvas.offsetHeight){
var oh = (this.p_height == this.canvas.clientHeight) ? this.canvas.offsetHeight : eval(this.p_height)+18; // fix for ie
this.fx.resizeCenter.start({height: oh});
break;
}
this.step++;
case 2:
if (this.center.clientWidth != this.canvas.offsetWidth){
var ow = (this.p_width == this.canvas.clientWidth) ? this.canvas.offsetWidth : eval(this.p_width)+18; // fix for ie
this.fx.resizeCenter.start({width: ow, marginLeft: -ow/2});
break;
}
this.step++;
case 3:
this.bottomContainer.setStyles({top: (this.top + this.center.clientHeight)+'px', height:'0px', marginLeft: this.center.style.marginLeft, width:this.center.style.width, display: ''});
this.fx.image.start(1);
break;
case 4:
if (this.options.animateCaption){
// This is not smooth animation in IE 6 with XML prolog.
// If your site is XHTML strict with XML prolog, disable this option.
this.fx.bottom.start(0,this.bottom.offsetHeight+10);
break;
}
this.bottomContainer.style.height = (this.bottom.offsetHeight+10)+'px';
case 5:
if (this.activeItem){
this.prevLink.style.display = '';
}
if (this.activeItem != (this.items.length - 1)){
this.nextLink.style.display = '';
}
this.step = 0;
}
},
close: function(){
if (this.step < 0) return;
this.step = -1;
this.removeCurrentItem(); // discard content
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;
},
removeCurrentItem: function(){
if (this.preload){
if( this.preload.datatype == 'image' ) {
$('lbImage').remove();
this.preload.onload = Class.empty;
}else{
$(this.iframeId).remove();
}
this.preload = null;
}
},
matchOrDefault: function(str, re, val){
var hasQuery = str.match(re);
return hasQuery ? hasQuery[1] : val;
}
};
window.addEvent('domready', Lightbox.init.bind(Lightbox));
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