Lightbox JS is a simple, unobtrusive script used to to overlay images on the current page. It's a snap to setup and works on all modern browsers.

http://www.huddletogether.com/projects/lightbox/

<script type="text/javascript"> /* Lightbox JS: Fullsize Image Overlays by Lokesh Dhakar - http://www.huddletogether.com For more information on this script, visit: http://huddletogether.com/projects/lightbox/ Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/ (basically, do anything you want, just leave my name and link) Table of Contents ----------------- Configuration Functions - getPageScroll() - getPageSize() - pause() - getKey() - listenKey() - showLightbox() - hideLightbox() - initLightbox() - addLoadEvent() Function Calls - addLoadEvent(initLightbox) */ // // Configuration // // If you would like to use a custom loading image or close button reference them in the next two lines. var loadingImage = 'http://www.huddletogether.com/projects/lightbox/loading.gif'; var closeButton = 'http://www.huddletogether.com/projects/lightbox/close.gif'; // // 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; } // // pause(numberMillis) // Pauses code execution for specified time. Uses busy code, not good. // Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602 // function pause(numberMillis) { var now = new Date(); var exitTime = now.getTime() + numberMillis; while (true) { now = new Date(); if (now.getTime() > exitTime) return; } } // // 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'){ hideLightbox(); } } // // listenKey() // function listenKey () { document.onkeypress = getKey; } // // showLightbox() // Preloads images. Pleaces new image in lightbox then centers and displays. // function showLightbox(objLink) { // prep objects var objOverlay = document.getElementById('overlay'); var objLightbox = document.getElementById('lightbox'); var objCaption = document.getElementById('lightboxCaption'); var objImage = document.getElementById('lightboxImage'); var objLoadingImage = document.getElementById('loadingImage'); var objLightboxDetails = document.getElementById('lightboxDetails'); var arrayPageSize = getPageSize(); var arrayPageScroll = getPageScroll(); // center loadingImage if it exists if (objLoadingImage) { objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px'); objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px'); objLoadingImage.style.display = 'block'; } // set height of Overlay to take up whole page and show objOverlay.style.height = (arrayPageSize[1] + 'px'); objOverlay.style.display = 'block'; // preload image imgPreload = new Image(); imgPreload.onload=function(){ objImage.src = objLink.href; // center lightbox and make sure that the top and left values are not negative // and the image placed outside the viewport var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2); var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2); objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px"; objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px"; objLightboxDetails.style.width = imgPreload.width + 'px'; if(objLink.getAttribute('title')){ objCaption.style.display = 'block'; //objCaption.style.width = imgPreload.width + 'px'; objCaption.innerHTML = objLink.getAttribute('title'); } else { objCaption.style.display = 'none'; } // A small pause between the image loading and displaying is required with IE, // this prevents the previous image displaying for a short burst causing flicker. if (navigator.appVersion.indexOf("MSIE")!=-1){ pause(250); } if (objLoadingImage) { objLoadingImage.style.display = 'none'; } objLightbox.style.display = 'block'; // After image is loaded, update the overlay height as the new image might have // increased the overall page height. arrayPageSize = getPageSize(); objOverlay.style.height = (arrayPageSize[1] + 'px'); // Check for 'x' keypress listenKey(); return false; } imgPreload.src = objLink.href; } // // hideLightbox() // function hideLightbox() { // get objects objOverlay = document.getElementById('overlay'); objLightbox = document.getElementById('lightbox'); // hide lightbox and overlay objOverlay.style.display = 'none'; objLightbox.style.display = 'none'; // disable keypress listener document.onkeypress = ''; } // // initLightbox() // Function runs on window load, going through link tags looking for rel="lightbox". // These links receive onclick events that enable the lightbox display for their targets. // The function also inserts html markup at the top of the page which will be used as a // container for the overlay pattern and the inline image. // function initLightbox() { if (!document.getElementsByTagName){ return; } var anchors = document.getElementsByTagName("a"); // loop through all anchor tags for (var i=0; i<anchors.length; i++){="" var="" anchor="anchors[i];" if="" (anchor.getattribute("href")="" &&="" (anchor.getattribute("rel")="=" "lightbox")){="" anchor.onclick="function" ()="" {showlightbox(this);="" return="" false;}="" }="" }="" the="" rest="" of="" this="" code="" inserts="" html="" at="" the="" top="" of="" the="" page="" that="" looks="" like="" this:="" <div="" id="overlay"> // // //
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var objBody = document.getElementsByTagName("body").item(0); // create overlay div and hardcode some functional styles (aesthetic styles are in CSS file) var objOverlay = document.createElement("div"); objOverlay.setAttribute('id','overlay'); objOverlay.onclick = function () {hideLightbox(); return false;} objOverlay.style.display = 'none'; objOverlay.style.position = 'absolute'; objOverlay.style.top = '0'; objOverlay.style.left = '0'; objOverlay.style.zIndex = '90'; objOverlay.style.width = '100%'; objBody.insertBefore(objOverlay, objBody.firstChild); var arrayPageSize = getPageSize(); var arrayPageScroll = getPageScroll(); // preload and create loader image var imgPreloader = new Image(); // if loader image found, create link to hide lightbox and create loadingimage imgPreloader.onload=function(){ var objLoadingImageLink = document.createElement("a"); objLoadingImageLink.setAttribute('href','#'); objLoadingImageLink.onclick = function () {hideLightbox(); return false;} objOverlay.appendChild(objLoadingImageLink); var objLoadingImage = document.createElement("img"); objLoadingImage.src = loadingImage; objLoadingImage.setAttribute('id','loadingImage'); objLoadingImage.style.position = 'absolute'; objLoadingImage.style.zIndex = '150'; objLoadingImageLink.appendChild(objLoadingImage); imgPreloader.onload=function(){}; // clear onLoad, as IE will flip out w/animated gifs return false; } imgPreloader.src = loadingImage; // create lightbox div, same note about styles as above var objLightbox = document.createElement("div"); objLightbox.setAttribute('id','lightbox'); objLightbox.style.display = 'none'; objLightbox.style.position = 'absolute'; objLightbox.style.zIndex = '100'; objBody.insertBefore(objLightbox, objOverlay.nextSibling); // create link var objLink = document.createElement("a"); objLink.setAttribute('href','#'); objLink.setAttribute('title','Click to close'); objLink.onclick = function () {hideLightbox(); return false;} objLightbox.appendChild(objLink); // preload and create close button image var imgPreloadCloseButton = new Image(); // if close button image found, imgPreloadCloseButton.onload=function(){ var objCloseButton = document.createElement("img"); objCloseButton.src = closeButton; objCloseButton.setAttribute('id','closeButton'); objCloseButton.style.position = 'absolute'; objCloseButton.style.zIndex = '200'; objLink.appendChild(objCloseButton); return false; } imgPreloadCloseButton.src = closeButton; // create image var objImage = document.createElement("img"); objImage.setAttribute('id','lightboxImage'); objLink.appendChild(objImage); // create details div, a container for the caption and keyboard message var objLightboxDetails = document.createElement("div"); objLightboxDetails.setAttribute('id','lightboxDetails'); objLightbox.appendChild(objLightboxDetails); // create caption var objCaption = document.createElement("div"); objCaption.setAttribute('id','lightboxCaption'); objCaption.style.display = 'none'; objLightboxDetails.appendChild(objCaption); // create keyboard message var objKeyboardMsg = document.createElement("div"); objKeyboardMsg.setAttribute('id','keyboardMsg'); objKeyboardMsg.innerHTML = 'press x to close'; objLightboxDetails.appendChild(objKeyboardMsg); } // // addLoadEvent() // Adds event to window.onload without overwriting currently assigned onload functions. // Function found at Simon Willison's weblog - http://simon.incutio.com/ // function addLoadEvent(func) { var oldonload = window.onload; if (typeof window.onload != 'function'){ window.onload = func; } else { window.onload = function(){ oldonload(); func(); } } } addLoadEvent(initLightbox); // run initLightbox onLoad </script> <style type="text/css" media="screen"> #lightbox{ background-color:#eee; padding: 10px; border-bottom: 2px solid #666; border-right: 2px solid #666; } #lightboxDetails{ font-size: 0.8em; padding-top: 0.4em; } #lightboxCaption{ float: left; } #keyboardMsg{ float: right; } #closeButton{ top: 5px; right: 5px; } #lightbox img{ border: none; clear: both;} #overlay img{ border: none; } #overlay{ background-image: url(http://www.huddletogether.com/projects/lightbox/overlay.png); } * html #overlay{ background-color: #333; background-color: transparent; background-image: url(http://www.huddletogether.com/projects/lightbox/blank.gif); filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src="http://www.huddletogether.com/projects/lightbox/overlay.png", sizingMethod="scale"); } </style>
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