Template:Bielefeld-CeBiTec/lightbox-web.js
// ----------------------------------------------------------------------------------- // // Lightbox v2.04 // by Lokesh Dhakar - http://www.lokeshdhakar.com // Last Modification: 2/9/08 // // For more information, visit: // http://lokeshdhakar.com/projects/lightbox2/ // // Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/ // - Free for use in both personal and commercial projects // - Attribution requires leaving author name, author link, and the license info intact. // // Thanks: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), and Thomas Fuchs(mir.aculo.us) for ideas, libs, and snippets. // Artemy Tregubenko (arty.name) for cleanup and help in updating to latest ver of proto-aculous. // // ----------------------------------------------------------------------------------- /*
Table of Contents ----------------- Configuration
Lightbox Class Declaration - initialize() - updateImageList() - start() - changeImage() - resizeImageContainer() - showImage() - updateDetails() - updateNav() - enableKeyboardNav() - disableKeyboardNav() - keyboardAction() - preloadNeighborImages() - end() Function Calls - document.observe()
- /
// -----------------------------------------------------------------------------------
// // Configurationl // LightboxOptions = Object.extend({
fileLoadingImage: 'images/loading.gif', fileBottomNavCloseImage: 'images/closelabel.gif',
overlayOpacity: 0.8, // controls transparency of shadow overlay
animate: true, // toggles resizing animations resizeSpeed: 7, // controls the speed of the image resizing animations (1=slowest and 10=fastest)
borderSize: 10, //if you adjust the padding in the CSS, you will need to update this variable
// When grouping images this is used to write: Image # of #. // Change it for non-english localization labelImage: "Image", labelOf: "of" }, window.LightboxOptions || {});
// -----------------------------------------------------------------------------------
var Lightbox = Class.create();
Lightbox.prototype = {
imageArray: [],
activeImage: undefined,
// initialize()
// Constructor runs on completion of the DOM loading. Calls updateImageList and then
// the function inserts html at the bottom of the page which is used to display the shadow
// overlay and the image container.
//
initialize: function() {
this.updateImageList();
this.keyboardAction = this.keyboardAction.bindAsEventListener(this);
if (LightboxOptions.resizeSpeed > 10) LightboxOptions.resizeSpeed = 10;
if (LightboxOptions.resizeSpeed < 1) LightboxOptions.resizeSpeed = 1;
this.resizeDuration = LightboxOptions.animate ? ((11 - LightboxOptions.resizeSpeed) * 0.15) : 0; this.overlayDuration = LightboxOptions.animate ? 0.2 : 0; // shadow fade in/out duration
// When Lightbox starts it will resize itself from 250 by 250 to the current image dimension.
// If animations are turned off, it will be hidden as to prevent a flicker of a
// white 250 by 250 box.
var size = (LightboxOptions.animate ? 250 : 1) + 'px';
// Code inserts html at the bottom of the page that looks similar to this:
//
//
// // <img id="lightboxImage">// //
// <a href="#" id="loadingLink">
// <img src="images/loading.gif">
// </a>
// //
//
//
var objBody = $$('body')[0];
objBody.appendChild(Builder.node('div',{id:'overlay'}));
objBody.appendChild(Builder.node('div',{id:'lightbox'}, [
Builder.node('div',{id:'outerImageContainer'},
Builder.node('div',{id:'imageContainer'}, [
Builder.node('img',{id:'lightboxImage'}),
Builder.node('div',{id:'hoverNav'}, [
Builder.node('a',{id:'prevLink', href: '#' }),
Builder.node('a',{id:'nextLink', href: '#' })
]),
Builder.node('div',{id:'loading'},
Builder.node('a',{id:'loadingLink', href: '#' },
Builder.node('img', {src: LightboxOptions.fileLoadingImage})
)
)
])
),
Builder.node('div', {id:'imageDataContainer'},
Builder.node('div',{id:'imageData'}, [
Builder.node('div',{id:'imageDetails'}, [
Builder.node('span',{id:'caption'}),
Builder.node('span',{id:'numberDisplay'})
]),
Builder.node('div',{id:'bottomNav'},
Builder.node('a',{id:'bottomNavClose', href: '#' },
Builder.node('img', { src: LightboxOptions.fileBottomNavCloseImage })
)
)
])
)
]));
$('overlay').hide().observe('click', (function() { this.end(); }).bind(this));
$('lightbox').hide().observe('click', (function(event) { if (event.element().id == 'lightbox') this.end(); }).bind(this));
$('outerImageContainer').setStyle({ width: size, height: size });
$('prevLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage - 1); }).bindAsEventListener(this));
$('nextLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage + 1); }).bindAsEventListener(this));
$('loadingLink').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
$('bottomNavClose').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
var th = this;
(function(){
var ids =
'overlay lightbox outerImageContainer imageContainer lightboxImage hoverNav prevLink nextLink loading loadingLink ' +
'imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose';
$w(ids).each(function(id){ th[id] = $(id); });
}).defer();
},
//
// updateImageList()
// Loops through anchor tags looking for 'lightbox' references and applies onclick
// events to appropriate links. You can rerun after dynamically adding images w/ajax.
//
updateImageList: function() {
this.updateImageList = Prototype.emptyFunction;
document.observe('click', (function(event){
var target = event.findElement('a[rel^=lightbox]') || event.findElement('area[rel^=lightbox]');
if (target) {
event.stop();
this.start(target);
}
}).bind(this));
},
//
// start()
// Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
//
start: function(imageLink) {
$$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'hidden' });
// stretch overlay to fill page and fade in
var arrayPageSize = this.getPageSize();
$('overlay').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });
new Effect.Appear(this.overlay, { duration: this.overlayDuration, from: 0.0, to: LightboxOptions.overlayOpacity });
this.imageArray = [];
var imageNum = 0;
if ((imageLink.rel == 'lightbox')){
// if image is NOT part of a set, add single image to imageArray
this.imageArray.push([imageLink.href, imageLink.title]);
} else {
// if image is part of a set..
this.imageArray =
$$(imageLink.tagName + '[href][rel="' + imageLink.rel + '"]').
collect(function(anchor){ return [anchor.href, anchor.title]; }).
uniq();
while (this.imageArray[imageNum][0] != imageLink.href) { imageNum++; }
}
// calculate top and left offset for the lightbox
var arrayPageScroll = document.viewport.getScrollOffsets();
var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);
var lightboxLeft = arrayPageScroll[0];
this.lightbox.setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' }).show();
this.changeImage(imageNum);
},
//
// changeImage()
// Hide most elements and preload image in preparation for resizing image container.
//
changeImage: function(imageNum) {
this.activeImage = imageNum; // update global var
// hide elements during transition
if (LightboxOptions.animate) this.loading.show();
this.lightboxImage.hide();
this.hoverNav.hide();
this.prevLink.hide();
this.nextLink.hide();
// HACK: Opera9 does not currently support scriptaculous opacity and appear fx
this.imageDataContainer.setStyle({opacity: .0001});
this.numberDisplay.hide();
var imgPreloader = new Image();
// once image is preloaded, resize image container
imgPreloader.onload = (function(){
this.lightboxImage.src = this.imageArray[this.activeImage][0];
this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
}).bind(this);
imgPreloader.src = this.imageArray[this.activeImage][0];
},
//
// resizeImageContainer()
//
resizeImageContainer: function(imgWidth, imgHeight) {
// get current width and height
var widthCurrent = this.outerImageContainer.getWidth();
var heightCurrent = this.outerImageContainer.getHeight();
// get new width and height
var widthNew = (imgWidth + LightboxOptions.borderSize * 2);
var heightNew = (imgHeight + LightboxOptions.borderSize * 2);
// scalars based on change from old to new
var xScale = (widthNew / widthCurrent) * 100;
var yScale = (heightNew / heightCurrent) * 100;
// calculate size difference between new and old image, and resize if necessary
var wDiff = widthCurrent - widthNew;
var hDiff = heightCurrent - heightNew;
if (hDiff != 0) new Effect.Scale(this.outerImageContainer, yScale, {scaleX: false, duration: this.resizeDuration, queue: 'front'});
if (wDiff != 0) new Effect.Scale(this.outerImageContainer, xScale, {scaleY: false, duration: this.resizeDuration, delay: this.resizeDuration});
// if new and old image are same size and no scaling transition is necessary,
// do a quick pause to prevent image flicker.
var timeout = 0;
if ((hDiff == 0) && (wDiff == 0)){
timeout = 100;
if (Prototype.Browser.IE) timeout = 250;
}
(function(){
this.prevLink.setStyle({ height: imgHeight + 'px' });
this.nextLink.setStyle({ height: imgHeight + 'px' });
this.imageDataContainer.setStyle({ width: widthNew + 'px' });
this.showImage();
}).bind(this).delay(timeout / 1000);
},
//
// showImage()
// Display image and begin preloading neighbors.
//
showImage: function(){
this.loading.hide();
new Effect.Appear(this.lightboxImage, {
duration: this.resizeDuration,
queue: 'end',
afterFinish: (function(){ this.updateDetails(); }).bind(this)
});
this.preloadNeighborImages();
},
//
// updateDetails()
// Display caption, image number, and bottom nav.
//
updateDetails: function() {
// if caption is not null
if (this.imageArray[this.activeImage][1] != ""){
this.caption.update(this.imageArray[this.activeImage][1]).show();
}
// if image is part of set display 'Image x of x'
if (this.imageArray.length > 1){
this.numberDisplay.update( LightboxOptions.labelImage + ' ' + (this.activeImage + 1) + ' ' + LightboxOptions.labelOf + ' ' + this.imageArray.length).show();
}
new Effect.Parallel(
[
new Effect.SlideDown(this.imageDataContainer, { sync: true, duration: this.resizeDuration, from: 0.0, to: 1.0 }),
new Effect.Appear(this.imageDataContainer, { sync: true, duration: this.resizeDuration })
],
{
duration: this.resizeDuration,
afterFinish: (function() {
// update overlay size and update nav var arrayPageSize = this.getPageSize(); this.overlay.setStyle({ height: arrayPageSize[1] + 'px' }); this.updateNav();
}).bind(this)
}
);
},
//
// updateNav()
// Display appropriate previous and next hover navigation.
//
updateNav: function() {
this.hoverNav.show();
// if not first image in set, display prev image button
if (this.activeImage > 0) this.prevLink.show();
// if not last image in set, display next image button
if (this.activeImage < (this.imageArray.length - 1)) this.nextLink.show();
this.enableKeyboardNav();
},
//
// enableKeyboardNav()
//
enableKeyboardNav: function() {
document.observe('keydown', this.keyboardAction);
},
//
// disableKeyboardNav()
//
disableKeyboardNav: function() {
document.stopObserving('keydown', this.keyboardAction);
},
//
// keyboardAction()
//
keyboardAction: function(event) {
var keycode = event.keyCode;
var escapeKey;
if (event.DOM_VK_ESCAPE) { // mozilla
escapeKey = event.DOM_VK_ESCAPE;
} else { // ie
escapeKey = 27;
}
var key = String.fromCharCode(keycode).toLowerCase();
if (key.match(/x|o|c/) || (keycode == escapeKey)){ // close lightbox
this.end();
} else if ((key == 'p') || (keycode == 37)){ // display previous image
if (this.activeImage != 0){
this.disableKeyboardNav();
this.changeImage(this.activeImage - 1);
}
} else if ((key == 'n') || (keycode == 39)){ // display next image
if (this.activeImage != (this.imageArray.length - 1)){
this.disableKeyboardNav();
this.changeImage(this.activeImage + 1);
}
}
},
//
// preloadNeighborImages()
// Preload previous and next images.
//
preloadNeighborImages: function(){
var preloadNextImage, preloadPrevImage;
if (this.imageArray.length > this.activeImage + 1){
preloadNextImage = new Image();
preloadNextImage.src = this.imageArray[this.activeImage + 1][0];
}
if (this.activeImage > 0){
preloadPrevImage = new Image();
preloadPrevImage.src = this.imageArray[this.activeImage - 1][0];
}
},
//
// end()
//
end: function() {
this.disableKeyboardNav();
this.lightbox.hide();
new Effect.Fade(this.overlay, { duration: this.overlayDuration });
$$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'visible' });
},
//
// getPageSize()
//
getPageSize: function() {
var xScroll, yScroll;
if (window.innerHeight && window.scrollMaxY) { xScroll = window.innerWidth + window.scrollMaxX; yScroll = window.innerHeight + window.scrollMaxY; } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac xScroll = document.body.scrollWidth; yScroll = document.body.scrollHeight; } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari xScroll = document.body.offsetWidth; yScroll = document.body.offsetHeight; }
var windowWidth, windowHeight;
if (self.innerHeight) { // all except Explorer if(document.documentElement.clientWidth){ windowWidth = document.documentElement.clientWidth; } else { windowWidth = self.innerWidth; } windowHeight = self.innerHeight; } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode windowWidth = document.documentElement.clientWidth; windowHeight = document.documentElement.clientHeight; } else if (document.body) { // other Explorers windowWidth = document.body.clientWidth; windowHeight = document.body.clientHeight; }
// for small pages with total height less then height of the viewport if(yScroll < windowHeight){ pageHeight = windowHeight; } else { pageHeight = yScroll; }
// for small pages with total width less then width of the viewport if(xScroll < windowWidth){ pageWidth = xScroll; } else { pageWidth = windowWidth; }
return [pageWidth,pageHeight]; } }
document.observe('dom:loaded', function () { new Lightbox(); });