Team:Lethbridge Canada/js lightbox

From 2014hs.igem.org

// ----------------------------------------------------------------------------------- // // Lightbox v2.03 // by Lokesh Dhakar - http://www.huddletogether.com // 4/9/06 // // For more information on this script, visit: // http://huddletogether.com/projects/lightbox2/ // // Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/ // // Credit also due to those who have helped, inspired, and made their code available to the public. // Including: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.org), Thomas Fuchs(mir.aculo.us), and others. // // Lightbox v2.03a // by Dynamicdrive.com- http://www.dynamicdrive.com // Nov 29th, 2007 // Added ability for the caption ("title" attr of link) to be optionally hyperlinked, by throwing in a "rev" attr containing the desired link // ----------------------------------------------------------------------------------- /*

Table of Contents ----------------- Configuration Global Variables

Extending Built-in Objects - Object.extend(Element) - Array.prototype.removeDuplicates() - Array.prototype.empty()

Lightbox Class Declaration - initialize() - start() - changeImage() - resizeImageContainer() - showImage() - updateDetails() - updateNav() - enableKeyboardNav() - disableKeyboardNav() - keyboardAction() - preloadNeighborImages() - end()

Miscellaneous Functions - getPageScroll() - getPageSize() - getKey() - listenKey() - showSelectBoxes() - hideSelectBoxes() - showFlash() - hideFlash() - pause() - initLightbox()

Function Calls - addLoadEvent(initLightbox)

/

// -----------------------------------------------------------------------------------

// // Configuration // var fileLoadingImage = "images/loading.gif"; var fileBottomNavCloseImage = "images/closelabel.gif";

var animate = true; // toggles resizing animations var resizeSpeed = 7; // controls the speed of the image resizing animations (1=slowest and 10=fastest)

var borderSize = 10; //if you adjust the padding in the CSS, you will need to update this variable

// -----------------------------------------------------------------------------------

// // Global Variables // var imageArray = new Array; var activeImage;

if(animate == true){ overlayDuration = 0.2; // shadow fade in/out duration if(resizeSpeed > 10){ resizeSpeed = 10;} if(resizeSpeed < 1){ resizeSpeed = 1;} resizeDuration = (11 - resizeSpeed) * 0.15; } else { overlayDuration = 0; resizeDuration = 0; }

// -----------------------------------------------------------------------------------

// // Additional methods for Element added by SU, Couloir // - further additions by Lokesh Dhakar (huddletogether.com) // Object.extend(Element, { getWidth: function(element) { element = $(element); return element.offsetWidth; }, setWidth: function(element,w) { element = $(element);

   	element.style.width = w +"px";

}, setHeight: function(element,h) {

  		element = $(element);
   	element.style.height = h +"px";

}, setTop: function(element,t) { element = $(element);

   	element.style.top = t +"px";

}, setSrc: function(element,src) {

   	element = $(element);
   	element.src = src;

}, setHref: function(element,href) {

   	element = $(element);
   	element.href = href;

}, setInnerHTML: function(element,content) { element = $(element); element.innerHTML = content; } });

// -----------------------------------------------------------------------------------

// // Extending built-in Array object // - array.removeDuplicates() // - array.empty() // Array.prototype.removeDuplicates = function () {

   for(i = 0; i < this.length; i++){
       for(j = this.length-1; j>i; j--){        
           if(this[i][0] == this[j][0]){
               this.splice(j,1);
           }
       }
   }

}

// -----------------------------------------------------------------------------------

Array.prototype.empty = function () { for(i = 0; i <= this.length; i++){ this.shift(); } }

// -----------------------------------------------------------------------------------

// // Lightbox Class Declaration // - initialize() // - start() // - changeImage() // - resizeImageContainer() // - showImage() // - updateDetails() // - updateNav() // - enableKeyboardNav() // - disableKeyboardNav() // - keyboardNavAction() // - preloadNeighborImages() // - end() // // Structuring of code inspired by Scott Upton (http://www.uptonic.com/) // var Lightbox = Class.create();

Lightbox.prototype = {

// initialize() // Constructor runs on completion of the DOM loading. Loops through anchor tags looking for // 'lightbox' references and applies onclick events to appropriate links. The 2nd section of // the function inserts html at the bottom of the page which is used to display the shadow // overlay and the image container. // initialize: function() { if (!document.getElementsByTagName){ return; } var anchors = document.getElementsByTagName('a'); var areas = document.getElementsByTagName('area');

// loop through all anchor tags for (var i=0; i<anchors.length; i++){ var anchor = anchors[i];

var relAttribute = String(anchor.getAttribute('rel'));

// use the string.match() method to catch 'lightbox' references in the rel attribute if (anchor.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox'))){ anchor.onclick = function () {myLightbox.start(this); return false;} } }

// loop through all area tags // todo: combine anchor & area tag loops for (var i=0; i< areas.length; i++){ var area = areas[i];

var relAttribute = String(area.getAttribute('rel'));

// use the string.match() method to catch 'lightbox' references in the rel attribute if (area.getAttribute('href') && (relAttribute.toLowerCase().match('lightbox'))){ area.onclick = function () {myLightbox.start(this); return false;} } }

// The rest of this code inserts html at the bottom of the page that looks similar to this: //

//

var objBody = document.getElementsByTagName("body").item(0);

var objOverlay = document.createElement("div"); objOverlay.setAttribute('id','overlay'); objOverlay.style.display = 'none'; objOverlay.onclick = function() { myLightbox.end(); } objBody.appendChild(objOverlay);

var objLightbox = document.createElement("div"); objLightbox.setAttribute('id','lightbox'); objLightbox.style.display = 'none'; objLightbox.onclick = function(e) { // close Lightbox is user clicks shadow overlay if (!e) var e = window.event; var clickObj = Event.element(e).id; if ( clickObj == 'lightbox') { myLightbox.end(); } }; objBody.appendChild(objLightbox);

var objOuterImageContainer = document.createElement("div"); objOuterImageContainer.setAttribute('id','outerImageContainer'); objLightbox.appendChild(objOuterImageContainer);

// 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. if(animate){ Element.setWidth('outerImageContainer', 250); Element.setHeight('outerImageContainer', 250); } else { Element.setWidth('outerImageContainer', 1); Element.setHeight('outerImageContainer', 1); }

var objImageContainer = document.createElement("div"); objImageContainer.setAttribute('id','imageContainer'); objOuterImageContainer.appendChild(objImageContainer);

var objLightboxImage = document.createElement("img"); objLightboxImage.setAttribute('id','lightboxImage'); objImageContainer.appendChild(objLightboxImage);

var objHoverNav = document.createElement("div"); objHoverNav.setAttribute('id','hoverNav'); objImageContainer.appendChild(objHoverNav);

var objPrevLink = document.createElement("a"); objPrevLink.setAttribute('id','prevLink'); objPrevLink.setAttribute('href','#'); objHoverNav.appendChild(objPrevLink);

var objNextLink = document.createElement("a"); objNextLink.setAttribute('id','nextLink'); objNextLink.setAttribute('href','#'); objHoverNav.appendChild(objNextLink);

var objLoading = document.createElement("div"); objLoading.setAttribute('id','loading'); objImageContainer.appendChild(objLoading);

var objLoadingLink = document.createElement("a"); objLoadingLink.setAttribute('id','loadingLink'); objLoadingLink.setAttribute('href','#'); objLoadingLink.onclick = function() { myLightbox.end(); return false; } objLoading.appendChild(objLoadingLink);

var objLoadingImage = document.createElement("img"); objLoadingImage.setAttribute('src', fileLoadingImage); objLoadingLink.appendChild(objLoadingImage);

var objImageDataContainer = document.createElement("div"); objImageDataContainer.setAttribute('id','imageDataContainer'); objImageDataContainer.className = 'clearfix'; objLightbox.appendChild(objImageDataContainer);

var objImageData = document.createElement("div"); objImageData.setAttribute('id','imageData'); objImageDataContainer.appendChild(objImageData);

var objImageDetails = document.createElement("div"); objImageDetails.setAttribute('id','imageDetails'); objImageData.appendChild(objImageDetails);

var objCaption = document.createElement("span"); objCaption.setAttribute('id','caption'); objImageDetails.appendChild(objCaption);

var objNumberDisplay = document.createElement("span"); objNumberDisplay.setAttribute('id','numberDisplay'); objImageDetails.appendChild(objNumberDisplay);

var objBottomNav = document.createElement("div"); objBottomNav.setAttribute('id','bottomNav'); objImageData.appendChild(objBottomNav);

var objBottomNavCloseLink = document.createElement("a"); objBottomNavCloseLink.setAttribute('id','bottomNavClose'); objBottomNavCloseLink.setAttribute('href','#'); objBottomNavCloseLink.onclick = function() { myLightbox.end(); return false; } objBottomNav.appendChild(objBottomNavCloseLink);

var objBottomNavCloseImage = document.createElement("img"); objBottomNavCloseImage.setAttribute('src', fileBottomNavCloseImage); objBottomNavCloseLink.appendChild(objBottomNavCloseImage); },

// // start() // Display overlay and lightbox. If image is part of a set, add siblings to imageArray. // start: function(imageLink) {

function getImageTitle(anchor){ //DynamicDrive.com added function that allows the caption("title") to be linked ("rev"). var ddimageTitle=anchor.getAttribute('title') var ddimageTitleURL=(ddimageTitle!=null && ddimageTitle!="")? anchor.getAttribute('rev') : null return ddimageTitleFinal=(ddimageTitleURL!=null && ddimageTitleURL!="")? '<a href="'+ddimageTitleURL+'" class="ddcaptionurl">'+ddimageTitle+'</a>' : ddimageTitle };

hideSelectBoxes(); hideFlash();

// stretch overlay to fill page and fade in var arrayPageSize = getPageSize(); Element.setHeight('overlay', arrayPageSize[1]);

new Effect.Appear('overlay', { duration: overlayDuration, from: 0.0, to: 0.8 });

imageArray = []; imageNum = 0;

if (!document.getElementsByTagName){ return; } var anchors = document.getElementsByTagName('a');

// if image is NOT part of a set.. if((imageLink.getAttribute('rel') == 'lightbox')){ // add single image to imageArray imageArray.push(new Array(imageLink.getAttribute('href'), getImageTitle(imageLink))); } else { // if image is part of a set..

// loop through anchors, find other images in set, and add them to imageArray for (var i=0; i<anchors.length; i++){ var anchor = anchors[i]; if (anchor.getAttribute('href') && (anchor.getAttribute('rel') == imageLink.getAttribute('rel'))){ imageArray.push(new Array(anchor.getAttribute('href'), getImageTitle(anchor))); } } imageArray.removeDuplicates(); while(imageArray[imageNum][0] != imageLink.getAttribute('href')) { imageNum++;} }

// calculate top offset for the lightbox and display var arrayPageScroll = getPageScroll(); var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 10);

Element.setTop('lightbox', lightboxTop); Element.show('lightbox');

this.changeImage(imageNum); },

// // changeImage() // Hide most elements and preload image in preparation for resizing image container. // changeImage: function(imageNum) {

activeImage = imageNum; // update global var

// hide elements during transition if(animate){ Element.show('loading');} Element.hide('lightboxImage'); Element.hide('hoverNav'); Element.hide('prevLink'); Element.hide('nextLink'); Element.hide('imageDataContainer'); Element.hide('numberDisplay');

imgPreloader = new Image();

// once image is preloaded, resize image container imgPreloader.onload=function(){ Element.setSrc('lightboxImage', imageArray[activeImage][0]); myLightbox.resizeImageContainer(imgPreloader.width, imgPreloader.height); } imgPreloader.src = imageArray[activeImage][0]; },

// // resizeImageContainer() // resizeImageContainer: function( imgWidth, imgHeight) {

// get curren width and height this.widthCurrent = Element.getWidth('outerImageContainer'); this.heightCurrent = Element.getHeight('outerImageContainer');

// get new width and height var widthNew = (imgWidth + (borderSize * 2)); var heightNew = (imgHeight + (borderSize * 2));

// scalars based on change from old to new this.xScale = ( widthNew / this.widthCurrent) * 100; this.yScale = ( heightNew / this.heightCurrent) * 100;

// calculate size difference between new and old image, and resize if necessary wDiff = this.widthCurrent - widthNew; hDiff = this.heightCurrent - heightNew;

if(!( hDiff == 0)){ new Effect.Scale('outerImageContainer', this.yScale, {scaleX: false, duration: resizeDuration, queue: 'front'}); } if(!( wDiff == 0)){ new Effect.Scale('outerImageContainer', this.xScale, {scaleY: false, delay: resizeDuration, duration: resizeDuration}); }

// if new and old image are same size and no scaling transition is necessary, // do a quick pause to prevent image flicker. if((hDiff == 0) && (wDiff == 0)){ if (navigator.appVersion.indexOf("MSIE")!=-1){ pause(250); } else { pause(100);} }

Element.setHeight('prevLink', imgHeight); Element.setHeight('nextLink', imgHeight); Element.setWidth( 'imageDataContainer', widthNew);

this.showImage(); },

// // showImage() // Display image and begin preloading neighbors. // showImage: function(){ Element.hide('loading'); new Effect.Appear('lightboxImage', { duration: resizeDuration, queue: 'end', afterFinish: function(){ myLightbox.updateDetails(); } }); this.preloadNeighborImages(); },

// // updateDetails() // Display caption, image number, and bottom nav. // updateDetails: function() {

Element.show('caption'); Element.setInnerHTML( 'caption', imageArray[activeImage][1]);

// if image is part of set display 'Image x of x' if(imageArray.length > 1){ Element.show('numberDisplay'); Element.setInnerHTML( 'numberDisplay', "Image " + eval(activeImage + 1) + " of " + imageArray.length); }

new Effect.Parallel( [ new Effect.SlideDown( 'imageDataContainer', { sync: true, duration: resizeDuration, from: 0.0, to: 1.0 }), new Effect.Appear('imageDataContainer', { sync: true, duration: resizeDuration }) ], { duration: resizeDuration, afterFinish: function() { // update overlay size and update nav var arrayPageSize = getPageSize(); Element.setHeight('overlay', arrayPageSize[1]); myLightbox.updateNav(); } } ); },

// // updateNav() // Display appropriate previous and next hover navigation. // updateNav: function() {

Element.show('hoverNav');

// if not first image in set, display prev image button if(activeImage != 0){ Element.show('prevLink'); document.getElementById('prevLink').onclick = function() { myLightbox.changeImage(activeImage - 1); return false; } }

// if not last image in set, display next image button if(activeImage != (imageArray.length - 1)){ Element.show('nextLink'); document.getElementById('nextLink').onclick = function() { myLightbox.changeImage(activeImage + 1); return false; } }

this.enableKeyboardNav(); },

// // enableKeyboardNav() // enableKeyboardNav: function() { document.onkeydown = this.keyboardAction; },

// // disableKeyboardNav() // disableKeyboardNav: function() { document.onkeydown = ; },

// // keyboardAction() // keyboardAction: function(e) { if (e == null) { // ie keycode = event.keyCode; escapeKey = 27; } else { // mozilla keycode = e.keyCode; escapeKey = e.DOM_VK_ESCAPE; }

key = String.fromCharCode(keycode).toLowerCase();

if((key == 'x') || (key == 'o') || (key == 'c') || (keycode == escapeKey)){ // close lightbox myLightbox.end(); } else if((key == 'p') || (keycode == 37)){ // display previous image if(activeImage != 0){ myLightbox.disableKeyboardNav(); myLightbox.changeImage(activeImage - 1); } } else if((key == 'n') || (keycode == 39)){ // display next image if(activeImage != (imageArray.length - 1)){ myLightbox.disableKeyboardNav(); myLightbox.changeImage(activeImage + 1); } }

},

// // preloadNeighborImages() // Preload previous and next images. // preloadNeighborImages: function(){

if((imageArray.length - 1) > activeImage){ preloadNextImage = new Image(); preloadNextImage.src = imageArray[activeImage + 1][0]; } if(activeImage > 0){ preloadPrevImage = new Image(); preloadPrevImage.src = imageArray[activeImage - 1][0]; }

},

// // end() // end: function() { this.disableKeyboardNav(); Element.hide('lightbox'); new Effect.Fade('overlay', { duration: overlayDuration}); showSelectBoxes(); showFlash(); } }

// -----------------------------------------------------------------------------------

// // getPageScroll() // Returns array with x,y page scroll values. // Core code from - quirksmode.org // function getPageScroll(){

var yScroll;

if (self.pageYOffset) { yScroll = self.pageYOffset; } else if (document.documentElement && document.documentElement.scrollTop){ // Explorer 6 Strict yScroll = document.documentElement.scrollTop; } else if (document.body) {// all other Explorers yScroll = document.body.scrollTop; }

arrayPageScroll = new Array(,yScroll) return arrayPageScroll; }

// -----------------------------------------------------------------------------------

// // getPageSize() // Returns array with page width, height and window width, height // Core code from - quirksmode.org // Edit for Firefox by pHaez // function getPageSize(){

var xScroll, yScroll;

if (window.innerHeight && window.scrollMaxY) { xScroll = document.body.scrollWidth; 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 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 = windowWidth; } else { pageWidth = xScroll; }

arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) return arrayPageSize; }

// -----------------------------------------------------------------------------------

// // getKey(key) // Gets keycode. If 'x' is pressed then it hides the lightbox. // function getKey(e){ if (e == null) { // ie keycode = event.keyCode; } else { // mozilla keycode = e.which; } key = String.fromCharCode(keycode).toLowerCase();

if(key == 'x'){ } }

// -----------------------------------------------------------------------------------

// // listenKey() // function listenKey () { document.onkeypress = getKey; }

// ---------------------------------------------------

function showSelectBoxes(){ var selects = document.getElementsByTagName("select"); for (i = 0; i != selects.length; i++) { selects[i].style.visibility = "visible"; } }

// ---------------------------------------------------

function hideSelectBoxes(){ var selects = document.getElementsByTagName("select"); for (i = 0; i != selects.length; i++) { selects[i].style.visibility = "hidden"; } }

// ---------------------------------------------------

function showFlash(){ var flashObjects = document.getElementsByTagName("object"); for (i = 0; i != flashObjects.length; i++) { flashObjects[i].style.visibility = "visible"; }

var flashEmbeds = document.getElementsByTagName("embeds"); for (i = 0; i != flashEmbeds.length; i++) { flashEmbeds[i].style.visibility = "visible"; } }

// ---------------------------------------------------

function hideFlash(){ var flashObjects = document.getElementsByTagName("object"); for (i = 0; i != flashObjects.length; i++) { flashObjects[i].style.visibility = "hidden"; }

var flashEmbeds = document.getElementsByTagName("embeds"); for (i = 0; i != flashEmbeds.length; i++) { flashEmbeds[i].style.visibility = "hidden"; }

}

// ---------------------------------------------------

// // pause(numberMillis) // Pauses code execution for specified time. Uses busy code, not good. // Help from Ran Bar-On [ran2103@gmail.com] //

/

// ---------------------------------------------------

function initLightbox() { myLightbox = new Lightbox(); } Event.observe(window, 'load', initLightbox, false);