1/* 2 Lightbox JS: Fullsize Image Overlays by Lokesh Dhakar - http://www.huddletogether.com 3 For more information on this script, visit: http://huddletogether.com/projects/lightbox/ 4 5 Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/ 6 (basically, do anything you want, just leave my name and link) 7 8 Table of Contents 9 ----------------- 10 Configuration 11 12 Functions 13 - getPageScroll() 14 - getPageSize() 15 - pause() 16 - getKey() 17 - listenKey() 18 - showLightbox() 19 - hideLightbox() 20 - initLightbox() 21 - addLoadEvent() 22 23 Function Calls 24 - addLoadEvent(initLightbox) 25 26 WP Lightbox JS WordPress Plugin: 27 -------------------------------- 28 Changelog 29 - 4/6/06 3:18 GMT+8: Fixes a Zlib output compression problem that conflicts with PHP setting (Rudd-0). 30 - 3/9/06 2:49 GMT+8: Enabled and use WordPress gzip compression (Safirul Alredha). 31 - 3/6/06 2:06 GMT+8: Fix plugin path issue (Dennis Crall). 32 - 3/3/06 19:00 GMT-5: Fixed blog caching override introduced by wp-blog-header.php (Rudd-O). 33 - 1/19/06 10:40PM EST: Added keypress (x) activated closing (Lokesh Dhakar). 34 35 Last updated: April 6, 2006 by Safirul Alredha 36 http://zeo.unic.net.my 37*/ 38// 39// getPageScroll() 40// Returns array with x,y page scroll values. 41// Core code from - quirksmode.org 42// 43function getPageScroll(){ 44 45 var yScroll; 46 47 if (self.pageYOffset) { 48 yScroll = self.pageYOffset; 49 } else if (document.documentElement && document.documentElement.scrollTop){ // Explorer 6 Strict 50 yScroll = document.documentElement.scrollTop; 51 } else if (document.body) {// all other Explorers 52 yScroll = document.body.scrollTop; 53 } 54 55 arrayPageScroll = new Array('',yScroll) 56 return arrayPageScroll; 57} 58 59// 60// getPageSize() 61// Returns array with page width, height and window width, height 62// Core code from - quirksmode.org 63// Edit for Firefox by pHaez 64// 65function getPageSize(){ 66 67 var xScroll, yScroll; 68 69 if (window.innerHeight && window.scrollMaxY) { 70 xScroll = document.body.scrollWidth; 71 yScroll = window.innerHeight + window.scrollMaxY; 72 } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac 73 xScroll = document.body.scrollWidth; 74 yScroll = document.body.scrollHeight; 75 } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari 76 xScroll = document.body.offsetWidth; 77 yScroll = document.body.offsetHeight; 78 } 79 80 var windowWidth, windowHeight; 81 if (self.innerHeight) { // all except Explorer 82 windowWidth = self.innerWidth; 83 windowHeight = self.innerHeight; 84 } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode 85 windowWidth = document.documentElement.clientWidth; 86 windowHeight = document.documentElement.clientHeight; 87 } else if (document.body) { // other Explorers 88 windowWidth = document.body.clientWidth; 89 windowHeight = document.body.clientHeight; 90 } 91 92 // for small pages with total height less then height of the viewport 93 if(yScroll < windowHeight){ 94 pageHeight = windowHeight; 95 } else { 96 pageHeight = yScroll; 97 } 98 99 // for small pages with total width less then width of the viewport 100 if(xScroll < windowWidth){ 101 pageWidth = windowWidth; 102 } else { 103 pageWidth = xScroll; 104 } 105 106 arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 107 return arrayPageSize; 108} 109 110// 111// pause(numberMillis) 112// Pauses code execution for specified time. Uses busy code, not good. 113// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602 114// 115function pause(numberMillis) { 116 var now = new Date(); 117 var exitTime = now.getTime() + numberMillis; 118 while (true) { 119 now = new Date(); 120 if (now.getTime() > exitTime) 121 return; 122 } 123} 124 125// 126// getKey(key) 127// Gets keycode. If 'x' is pressed then it hides the lightbox. 128// 129function getKey(e){ 130 if (e == null) { // ie 131 keycode = event.keyCode; 132 } else { // mozilla 133 keycode = e.which; 134 } 135 key = String.fromCharCode(keycode).toLowerCase(); 136 137 if(key == 'x'){ hideLightbox(); } 138} 139 140// 141// listenKey() 142// 143function listenKey () { document.onkeypress = getKey; } 144 145// 146// showLightbox() 147// Preloads images. Pleaces new image in lightbox then centers and displays. 148// 149function showLightbox(objLink) 150{ 151 // prep objects 152 var objOverlay = document.getElementById('overlay'); 153 var objLightbox = document.getElementById('lightbox'); 154 var objCaption = document.getElementById('lightboxCaption'); 155 var objImage = document.getElementById('lightboxImage'); 156 var objLoadingImage = document.getElementById('loadingImage'); 157 158 var arrayPageSize = getPageSize(); 159 var arrayPageScroll = getPageScroll(); 160 161 // center loadingImage if it exists 162 if (objLoadingImage) { 163 objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px'); 164 objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px'); 165 objLoadingImage.style.display = 'block'; 166 } 167 168 // set height of Overlay to take up whole page and show 169 objOverlay.style.height = (arrayPageSize[1] + 'px'); 170 objOverlay.style.display = 'block'; 171 172 // preload image 173 imgPreload = new Image(); 174 175 imgPreload.onload=function(){ 176 objImage.src = objLink.href; 177 178 // center lightbox and make sure that the top and left values are not negative 179 // and the image placed outside the viewport 180 var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2); 181 var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2); 182 183 objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px"; 184 objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px"; 185 186 //objLightboxDetails.style.width = imgPreload.width + 'px'; 187 188 if(objLink.getAttribute('title')){ 189 objCaption.style.display = 'block'; 190 objCaption.style.width = imgPreload.width + 'px'; 191 objCaption.innerHTML = objLink.getAttribute('title'); 192 } else { 193 objCaption.style.display = 'none'; 194 } 195 196 // A small pause between the image loading and displaying is required with IE, 197 // this prevents the previous image displaying for a short burst causing flicker. 198 if (navigator.appVersion.indexOf("MSIE")!=-1){ 199 pause(250); 200 } 201 202 if (objLoadingImage) { objLoadingImage.style.display = 'none'; } 203 objLightbox.style.display = 'block'; 204 205 // After image is loaded, update the overlay height as the new image might have 206 // increased the overall page height. 207 arrayPageSize = getPageSize(); 208 objOverlay.style.height = (arrayPageSize[1] + 'px'); 209 210 // Check for 'x' keypress 211 listenKey(); 212 213 return false;
214 } 215 216 imgPreload.src = objLink.href; 217 218} 219 220// 221// hideLightbox() 222// 223function hideLightbox() 224{ 225 // get objects 226 objOverlay = document.getElementById('overlay'); 227 objLightbox = document.getElementById('lightbox'); 228 229 // hide lightbox and overlay 230 objOverlay.style.display = 'none'; 231 objLightbox.style.display = 'none'; 232 233 // disable keypress listener 234 document.onkeypress = ''; 235 236} 237 238// 239// initLightbox() 240// Function runs on window load, going through link tags looking for rel="lightbox". 241// These links receive onclick events that enable the lightbox display for their targets. 242// The function also inserts html markup at the top of the page which will be used as a 243// container for the overlay pattern and the inline image. 244// 245function initLightbox() 246{ 247 248 if (!document.getElementsByTagName){ return; } 249 var anchors = document.getElementsByTagName("a"); 250 251 // loop through all anchor tags 252 for (var i=0; i<anchors.length; i++){ 253 var anchor = anchors[i]; 254 255 if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){ 256 anchor.onclick = function () {showLightbox(this); return false;} 257 } 258 } 259 260 // the rest of this code inserts html at the top of the page that looks like this: 261 // 262 // <div id="overlay"> 263 // <a href="#" onclick="hideLightbox(); return false;"><img id="loadingImage" /></a> 264 // </div> 265 // <div id="lightbox"> 266 // <a href="#" onclick="hideLightbox(); return false;" title="Click anywhere to close image"> 267 // <img id="closeButton" /> 268 // <img id="lightboxImage" /> 269 // </a> 270 // <div id="lightboxDetails"> 271 // <div id="lightboxCaption"></div> 272 // <div id="keyboardMsg"></div> 273 // </div> 274 // </div> 275 276 var objBody = document.getElementsByTagName("body").item(0); 277 278 // create overlay div and hardcode some functional styles (aesthetic styles are in CSS file) 279 var objOverlay = document.createElement("div"); 280 objOverlay.setAttribute('id','overlay'); 281 //objOverlay.onclick = function () {hideLightbox(); return false;} 282 objOverlay.style.display = 'none'; 283 objOverlay.style.position = 'absolute'; 284 objOverlay.style.top = '0'; 285 objOverlay.style.left = '0'; 286 objOverlay.style.zIndex = '90'; 287 objOverlay.style.width = '100%'; 288 objBody.insertBefore(objOverlay, objBody.firstChild); 289 290 var arrayPageSize = getPageSize(); 291 var arrayPageScroll = getPageScroll(); 292 293 // preload and create loader image 294 var imgPreloader = new Image(); 295 296 // if loader image found, create link to hide lightbox and create loadingimage 297 imgPreloader.onload=function(){ 298 299 var objLoadingImageLink = document.createElement("a"); 300 objLoadingImageLink.setAttribute('href','#'); 301 objLoadingImageLink.onclick = function () {hideLightbox(); return false;} 302 objOverlay.appendChild(objLoadingImageLink); 303 304 var objLoadingImage = document.createElement("img"); 305 objLoadingImage.src = loadingImage; 306 objLoadingImage.setAttribute('id','loadingImage'); 307 objLoadingImage.style.position = 'absolute'; 308 objLoadingImage.style.zIndex = '150'; 309 objLoadingImageLink.appendChild(objLoadingImage); 310 311 imgPreloader.onload=function(){}; // clear onLoad, as IE will flip out w/animated gifs 312 313 return false; 314 } 315 316 imgPreloader.src = loadingImage; 317 318 // create lightbox div, same note about styles as above 319 var objLightbox = document.createElement("div"); 320 objLightbox.setAttribute('id','lightbox'); 321 objLightbox.style.display = 'none'; 322 objLightbox.style.position = 'absolute'; 323 objLightbox.style.zIndex = '100'; 324 objBody.insertBefore(objLightbox, objOverlay.nextSibling); 325 326 // create link 327 var objLink = document.createElement("a"); 328 objLink.setAttribute('href','#'); 329 objLink.setAttribute('title','Click to close'); 330 objLink.onclick = function () {hideLightbox(); return false;} 331 objLightbox.appendChild(objLink); 332 333 // preload and create close button image 334 var imgPreloadCloseButton = new Image(); 335 336 // if close button image found, 337 imgPreloadCloseButton.onload=function(){ 338 339 var objCloseButton = document.createElement("img"); 340 objCloseButton.src = closeButton; 341 objCloseButton.setAttribute('id','closeButton'); 342 objCloseButton.style.position = 'absolute'; 343 objCloseButton.style.zIndex = '200'; 344 objCloseButton.style.top = '5px'; 345 objCloseButton.style.right = '5px'; 346 objLink.appendChild(objCloseButton); 347 348 return false;
349 } 350 351 imgPreloadCloseButton.src = closeButton; 352 353 // create image 354 var objImage = document.createElement("img"); 355 objImage.setAttribute('id','lightboxImage'); 356 objLink.appendChild(objImage); 357 358 // create caption 359 var objCaption = document.createElement("div"); 360 objCaption.setAttribute('id','lightboxCaption'); 361 objCaption.style.display = 'none'; 362 objLightbox.appendChild(objCaption); 363 364} 365 366// 367// addLoadEvent() 368// Adds event to window.onload without overwriting currently assigned onload functions. 369// Function found at Simon Willison's weblog - http://simon.incutio.com/ 370// 371function addLoadEvent(func) 372{ 373 var oldonload = window.onload; 374 if (typeof window.onload != 'function'){ 375 window.onload = func; 376 } else { 377 window.onload = function(){ 378 oldonload(); 379 func(); 380 } 381 } 382 383} 384 385addLoadEvent(initLightbox); // run initLightbox onLoad
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