Team:UC Davis/Home wip

From 2011.igem.org

(Difference between revisions)
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<head>
<head>
-
<script type="text/javascript" src="lightbox.js"></script>
+
<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 = 'loading.gif';
 +
var closeButton = 'close.gif';
 +
 
 +
 
 +
 
 +
 
 +
 
 +
//
 +
// getPageScroll()
 +
// Returns array with x,y page scroll values.
 +
// Core code from - quirksmode.org
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//
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function getPageScroll(){
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var yScroll;
 +
 
 +
if (self.pageYOffset) {
 +
yScroll = self.pageYOffset;
 +
} else if (document.documentElement && document.documentElement.scrollTop){ // Explorer 6 Strict
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yScroll = document.documentElement.scrollTop;
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} else if (document.body) {// all other Explorers
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yScroll = document.body.scrollTop;
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}
 +
 
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arrayPageScroll = new Array('',yScroll)
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return arrayPageScroll;
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}
 +
 
 +
 
 +
 
 +
//
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// 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'; }
 +
 
 +
// Hide select boxes as they will 'peek' through the image in IE
 +
selects = document.getElementsByTagName("select");
 +
        for (i = 0; i != selects.length; i++) {
 +
                selects[i].style.visibility = "hidden";
 +
        }
 +
 
 +
 +
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';
 +
 
 +
// make select boxes visible
 +
selects = document.getElementsByTagName("select");
 +
    for (i = 0; i != selects.length; i++) {
 +
selects[i].style.visibility = "visible";
 +
}
 +
 
 +
// 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">
 +
// <a href="#" onclick="hideLightbox(); return false;"><img id="loadingImage" /></a>
 +
// </div>
 +
// <div id="lightbox">
 +
// <a href="#" onclick="hideLightbox(); return false;" title="Click anywhere to close image">
 +
// <img id="closeButton" />
 +
// <img id="lightboxImage" />
 +
// </a>
 +
// <div id="lightboxDetails">
 +
// <div id="lightboxCaption"></div>
 +
// <div id="keyboardMsg"></div>
 +
// </div>
 +
// </div>
 +
 +
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 <a href="#" onclick="hideLightbox(); return false;"><kbd>x</kbd></a> 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>
</head>
</head>

Revision as of 20:50, 27 June 2011

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