1/* 2 Lightbox JS: Fullsize Image Overlays 3 by Lokesh Dhakar - http://www.huddletogether.com 4 5 For more information on this script, visit: 6 http://huddletogether.com/projects/lightbox/ 7 8 Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/ 9 (basically, do anything you want, just leave my name and link) 10 11 Table of Contents 12 ----------------- 13 Configuration 14 15 Functions 16 - getPageScroll() 17 - getPageSize() 18 - pause() 19 - getKey() 20 - listenKey() 21 - showLightbox() 22 - hideLightbox() 23 - initLightbox() 24 - addLoadEvent() 25 26 Function Calls 27 - addLoadEvent(initLightbox) 28 29*/ 30 31 32 33// 34// Configuration 35// 36 37// If you would like to use a custom loading image or close button reference them in the next two lines. 38var loadingImage = '../../conf/images/loading.gif'; 39var closeButton = '../../conf/images/close.gif'; 40 41 42 43 44 45// 46// getPageScroll() 47// Returns array with x,y page scroll values. 48// Core code from - quirksmode.org 49// 50function getPageScroll(){ 51 52 var yScroll; 53 54 if (self.pageYOffset) { 55 yScroll = self.pageYOffset; 56 } else if (document.documentElement && document.documentElement.scrollTop){ // Explorer 6 Strict 57 yScroll = document.documentElement.scrollTop; 58 } else if (document.body) {// all other Explorers 59 yScroll = document.body.scrollTop; 60 } 61 62 arrayPageScroll = new Array('',yScroll) 63 return arrayPageScroll; 64} 65 66 67 68// 69// getPageSize() 70// Returns array with page width, height and window width, height 71// Core code from - quirksmode.org 72// Edit for Firefox by pHaez 73// 74function getPageSize(){ 75 76 var xScroll, yScroll; 77 78 if (window.innerHeight && window.scrollMaxY) { 79 xScroll = document.body.scrollWidth; 80 yScroll = window.innerHeight + window.scrollMaxY; 81 } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac 82 xScroll = document.body.scrollWidth; 83 yScroll = document.body.scrollHeight; 84 } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari 85 xScroll = document.body.offsetWidth; 86 yScroll = document.body.offsetHeight; 87 } 88 89 var windowWidth, windowHeight; 90 if (self.innerHeight) { // all except Explorer 91 windowWidth = self.innerWidth; 92 windowHeight = self.innerHeight; 93 } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode 94 windowWidth = document.documentElement.clientWidth; 95 windowHeight = document.documentElement.clientHeight; 96 } else if (document.body) { // other Explorers 97 windowWidth = document.body.clientWidth; 98 windowHeight = document.body.clientHeight; 99 } 100 101 // for small pages with total height less then height of the viewport 102 if(yScroll < windowHeight){ 103 pageHeight = windowHeight; 104 } else { 105 pageHeight = yScroll; 106 } 107 108 // for small pages with total width less then width of the viewport 109 if(xScroll < windowWidth){ 110 pageWidth = windowWidth; 111 } else { 112 pageWidth = xScroll; 113 } 114 115 116 arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 117 return arrayPageSize; 118} 119 120 121// 122// pause(numberMillis) 123// Pauses code execution for specified time. Uses busy code, not good. 124// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602 125// 126function pause(numberMillis) { 127 var now = new Date(); 128 var exitTime = now.getTime() + numberMillis; 129 while (true) { 130 now = new Date(); 131 if (now.getTime() > exitTime) 132 return; 133 } 134} 135 136// 137// getKey(key) 138// Gets keycode. If 'x' is pressed then it hides the lightbox. 139// 140 141function getKey(e){ 142 if (e == null) { // ie 143 keycode = event.keyCode; 144 } else { // mozilla 145 keycode = e.which; 146 } 147 key = String.fromCharCode(keycode).toLowerCase(); 148 149 if(key == 'x'){ hideLightbox(); } 150} 151 152 153// 154// listenKey() 155// 156function listenKey () { document.onkeypress = getKey; } 157 158 159// 160// showLightbox() 161// Preloads images. Pleaces new image in lightbox then centers and displays. 162// 163function showLightbox(objLink) 164{ 165 // prep objects 166 var objOverlay = document.getElementById('overlay'); 167 var objLightbox = document.getElementById('lightbox'); 168 var objCaption = document.getElementById('lightboxCaption'); 169 var objImage = document.getElementById('lightboxImage'); 170 var objLoadingImage = document.getElementById('loadingImage'); 171 var objLightboxDetails = document.getElementById('lightboxDetails'); 172 173 174 var arrayPageSize = getPageSize(); 175 var arrayPageScroll = getPageScroll(); 176 177 // center loadingImage if it exists 178 if (objLoadingImage) { 179 objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px'); 180 objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px'); 181 objLoadingImage.style.display = 'block'; 182 } 183 184 // set height of Overlay to take up whole page and show 185 objOverlay.style.height = (arrayPageSize[1] + 'px'); 186 objOverlay.style.display = 'block'; 187 188 // preload image 189 imgPreload = new Image(); 190 191 imgPreload.onload=function(){ 192 objImage.src = objLink.href; 193 194 // center lightbox and make sure that the top and left values are not negative 195 // and the image placed outside the viewport 196 var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2); 197 var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2); 198 199 objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px"; 200 objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px"; 201 202 203 objLightboxDetails.style.width = imgPreload.width + 'px'; 204 205 if(objLink.getAttribute('title')){ 206 objCaption.style.display = 'block'; 207 //objCaption.style.width = imgPreload.width + 'px'; 208 objCaption.innerHTML = objLink.getAttribute('title'); 209 } else { 210 objCaption.style.display = 'none'; 211 } 212 213 // A small pause between the image loading and displaying is required with IE, 214 // this prevents the previous image displaying for a short burst causing flicker. 215 if (navigator.appVersion.indexOf("MSIE")!=-1){ 216 pause(250); 217 } 218 219 if (objLoadingImage) { objLoadingImage.style.display = 'none'; } 220 221 // Hide select boxes as they will 'peek' through the image in IE 222 selects = document.getElementsByTagName("select"); 223 for (i = 0; i != selects.length; i++) { 224 selects[i].style.visibility = "hidden"; 225 } 226 227 228 objLightbox.style.display = 'block'; 229 230 // After image is loaded, update the overlay height as the new image might have 231 // increased the overall page height. 232 arrayPageSize = getPageSize(); 233 objOverlay.style.height = (arrayPageSize[1] + 'px'); 234 235 // Check for 'x' keypress 236 listenKey(); 237 238 return false; 239 } 240 241 imgPreload.src = objLink.href; 242 243} 244 245 246 247 248 249// 250// hideLightbox() 251// 252function hideLightbox() 253{ 254 // get objects 255 objOverlay = document.getElementById('overlay'); 256 objLightbox = document.getElementById('lightbox'); 257 258 // hide lightbox and overlay 259 objOverlay.style.display = 'none'; 260 objLightbox.style.display = 'none'; 261 262 // make select boxes visible 263 selects = document.getElementsByTagName("select"); 264 for (i = 0; i != selects.length; i++) { 265 selects[i].style.visibility = "visible"; 266 } 267 268 // disable keypress listener 269 document.onkeypress = ''; 270} 271 272 273 274 275// 276// initLightbox() 277// Function runs on window load, going through link tags looking for rel="lightbox". 278// These links receive onclick events that enable the lightbox display for their targets. 279// The function also inserts html markup at the top of the page which will be used as a 280// container for the overlay pattern and the inline image. 281// 282function initLightbox() 283{ 284 285 if (!document.getElementsByTagName){ return; } 286 var anchors = document.getElementsByTagName("a"); 287 288 // loop through all anchor tags 289 for (var i=0; i<anchors.length; i++){ 290 var anchor = anchors[i]; 291 292 if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){ 293 anchor.onclick = function () {showLightbox(this); return false;} 294 } 295 } 296 297 // the rest of this code inserts html at the top of the page that looks like this: 298 // 299 // <div id="overlay"> 300 // <a href="#" onclick="hideLightbox(); return false;"><img id="loadingImage" /></a> 301 // </div> 302 // <div id="lightbox"> 303 // <a href="#" onclick="hideLightbox(); return false;
303" title="Click anywhere to close image"> 304 // <img id="closeButton" /> 305 // <img id="lightboxImage" /> 306 // </a> 307 // <div id="lightboxDetails"> 308 // <div id="lightboxCaption"></div> 309 // <div id="keyboardMsg"></div> 310 // </div> 311 // </div> 312 313 var objBody = document.getElementsByTagName("body").item(0); 314 315 // create overlay div and hardcode some functional styles (aesthetic styles are in CSS file) 316 var objOverlay = document.createElement("div"); 317 objOverlay.setAttribute('id','overlay'); 318 objOverlay.onclick = function () {hideLightbox(); return false;} 319 objOverlay.style.display = 'none'; 320 objOverlay.style.position = 'absolute'; 321 objOverlay.style.top = '0'; 322 objOverlay.style.left = '0'; 323 objOverlay.style.zIndex = '90'; 324 objOverlay.style.width = '100%'; 325 objBody.insertBefore(objOverlay, objBody.firstChild); 326 327 var arrayPageSize = getPageSize(); 328 var arrayPageScroll = getPageScroll(); 329 330 // preload and create loader image 331 var imgPreloader = new Image(); 332 333 // if loader image found, create link to hide lightbox and create loadingimage 334 imgPreloader.onload=function(){ 335 336 var objLoadingImageLink = document.createElement("a"); 337 objLoadingImageLink.setAttribute('href','#'); 338 objLoadingImageLink.onclick = function () {hideLightbox(); return false;} 339 objOverlay.appendChild(objLoadingImageLink); 340 341 var objLoadingImage = document.createElement("img"); 342 objLoadingImage.src = loadingImage; 343 objLoadingImage.setAttribute('id','loadingImage'); 344 objLoadingImage.style.position = 'absolute'; 345 objLoadingImage.style.zIndex = '150'; 346 objLoadingImageLink.appendChild(objLoadingImage); 347 348 imgPreloader.onload=function(){}; // clear onLoad, as IE will flip out w/animated gifs 349 350 return false; 351 } 352 353 imgPreloader.src = loadingImage; 354 355 // create lightbox div, same note about styles as above 356 var objLightbox = document.createElement("div"); 357 objLightbox.setAttribute('id','lightbox'); 358 objLightbox.style.display = 'none'; 359 objLightbox.style.position = 'absolute'; 360 objLightbox.style.zIndex = '100'; 361 objBody.insertBefore(objLightbox, objOverlay.nextSibling); 362 363 // create link 364 var objLink = document.createElement("a"); 365 objLink.setAttribute('href','#'); 366 objLink.setAttribute('title','Click to close'); 367 objLink.onclick = function () {hideLightbox(); return false;} 368 objLightbox.appendChild(objLink); 369 370 // preload and create close button image 371 var imgPreloadCloseButton = new Image(); 372 373 // if close button image found, 374 imgPreloadCloseButton.onload=function(){ 375 376 var objCloseButton = document.createElement("img"); 377 objCloseButton.src = closeButton; 378 objCloseButton.setAttribute('id','closeButton'); 379 objCloseButton.style.position = 'absolute'; 380 objCloseButton.style.zIndex = '200'; 381 objLink.appendChild(objCloseButton); 382 383 return false; 384 } 385 386 imgPreloadCloseButton.src = closeButton; 387 388 // create image 389 var objImage = document.createElement("img"); 390 objImage.setAttribute('id','lightboxImage'); 391 objLink.appendChild(objImage); 392 393 // create details div, a container for the caption and keyboard message 394 var objLightboxDetails = document.createElement("div"); 395 objLightboxDetails.setAttribute('id','lightboxDetails'); 396 objLightbox.appendChild(objLightboxDetails); 397 398 // create caption 399 var objCaption = document.createElement("div"); 400 objCaption.setAttribute('id','lightboxCaption'); 401 objCaption.style.display = 'none'; 402 objLightboxDetails.appendChild(objCaption); 403 404 // create keyboard message 405 var objKeyboardMsg = document.createElement("div"); 406 objKeyboardMsg.setAttribute('id','keyboardMsg'); 407 objKeyboardMsg.innerHTML = 'press <a href="#" onclick="hideLightbox(); return false;"><kbd>x</kbd></a> to close'; 408 objLightboxDetails.appendChild(objKeyboardMsg); 409 410 411} 412 413 414 415 416// 417// addLoadEvent() 418// Adds event to window.onload without overwriting currently assigned onload functions. 419// Function found at Simon Willison's weblog - http://simon.incutio.com/ 420// 421function addLoadEvent(func) 422{ 423 var oldonload = window.onload; 424 if (typeof window.onload != 'function'){ 425 window.onload = func; 426 } else { 427 window.onload = function(){ 428 oldonload(); 429 func(); 430 } 431 } 432 433} 434 435 436 437addLoadEvent(initLightbox); // run initLightbox onLoad
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