1/** 2 * Comment Likes - JavaScript 3 * 4 * This handles liking and unliking comments, as well as viewing who has 5 * liked a particular comment. 6 * 7 * @dependency Swipe (dynamically loaded when needed) 8 * 9 * @package Comment_Likes 10 * @subpackage JavaScript 11 */ 12(function () { 13 function init() { 14 let extWin; 15 let extWinCheck; 16 let commentLikeEvent; 17 18 // Only run once. 19 if (window.comment_likes_loaded) { 20 return; 21 } 22 window.comment_likes_loaded = true; 23 24 // Client-side cache of who liked a particular comment to avoid 25 // having to hit the server multiple times for the same data. 26 const commentLikeCache = {}; 27 28 let swipeLibPromise; 29 30 // Load the Swipe library, if it's not already loaded. 31 function swipeLibLoader() { 32 if (!swipeLibPromise) { 33 swipeLibPromise = new Promise((resolve, reject) => { 34 if (window.Swipe) { 35 resolve(window.Swipe); 36 } else { 37 const swipeScript = document.createElement('script'); 38 swipeScript.src = comment_like_text.swipeUrl; 39 swipeScript.async = true; 40 document.body.appendChild(swipeScript); 41 swipeScript.addEventListener('load', () => resolve(window.Swipe)); 42 swipeScript.addEventListener('error', error => reject(error)); 43 } 44 }); 45 } 46 return swipeLibPromise; 47 } 48 49 /** 50 * Parse the comment ID from a comment like link. 51 */ 52 function getCommentId(link) { 53 const commentId = 54 link && link.getAttribute('href') && link.getAttribute('href').split('like_comment='); 55 return commentId[1].split('&_wpnonce=')[0]; 56 } 57 58 /** 59 * Handle an ajax action on the comment like link. 60 */ 61 function handleLinkAction(link, action, commentId, callback) { 62 const nonce = 63 link && link.getAttribute('href') && link.getAttribute('href').split('_wpnonce=')[1]; 64 65 fetch('/wp-admin/admin-ajax.php', { 66 method: 'POST', 67 body: new URLSearchParams({ 68 action: action, 69 _wpnonce: nonce, 70 like_comment: commentId, 71 blog_id: Number(link.dataset.blog), 72 }), 73 headers: { 74 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8', 75 'X-Requested-With': 'XMLHttpRequest', 76 Accept: 'application/json', 77 'cache-control': 'no-cache', 78 pragma: 'no-cache', 79 }, 80 }) 81 .then(response => response.json()) 82 .then(callback); 83 } 84 85 function startPolling() { 86 // Append cookie polling login iframe to this window to wait for user to finish logging in (or cancel) 87 const loginIframe = document.createElement('iframe'); 88 loginIframe.id = 'wp-login-polling-iframe'; 89 loginIframe.src = 'https://wordpress.com/public.api/connect/?iframe=true'; 90 document.body.appendChild(loginIframe); 91 loginIframe.style.display = 'none'; 92 } 93 94 function stopPolling() { 95 const iframe = document.querySelector('#wp-login-polling-iframe'); 96 if (iframe) { 97 iframe.remove(); 98 } 99 } 100 101 function hide(el) { 102 if (el && el.style) { 103 el.style.display = 'none'; 104 } 105 } 106 107 function show(el) { 108 if (el && el.style) { 109 el.style.removeProperty('display'); 110 } 111 } 112 113 // Overlay used for displaying comment like info. 114 class Overlay { 115 constructor() { 116 // Overlay element. 117 this.el = document.createElement('div'); 118 this.el.classList.add('comment-likes-overlay'); 119 document.body.appendChild(this.el); 120 hide(this.el); 121 122 this.el.addEventListener('mouseenter', () => { 123 // Don't hide the overlay if the user is mousing over it. 124 overlay.cancelHide(); 125 }); 126 127 this.el.addEventListener('mouseleave', () => overlay.requestHide()); 128 129 // Inner contents of overlay. 130 this.innerEl = null; 131 132 // Instance of the Swipe library. 133 this.swipe = null; 134 135 // Timeout used for hiding the overlay. 136 this.hideTimeout = null; 137 } 138 139 // Initialise the overlay for use, removing any old content. 140 clear() { 141 // Unload any previous instance of Swipe (to avoid leaking a global 142 // event handler). This is done before clearing the contents of the 143 // overlay because Swipe expects the slides to still be present. 144 if (this.swipe) { 145 this.swipe.kill(); 146 this.swipe = null; 147 } 148 this.el.innerHTML = ''; 149 this.innerEl = document.createElement('div'); 150 this.innerEl.classList.add('inner'); 151 this.el.appendChild(this.innerEl); 152 } 153 154 /** 155 * Construct a list (<ul>) of user (gravatar, name) details. 156 * 157 * @param data liker data returned from the server 158 * @param klass CSS class to apply to the <ul> element 159 * @param start index of user to start at 160 * @param length number of users to include in the list 161 * 162 * @return A container element with the list 163 */ 164 getUserBits(data, klass, start, length) { 165 start = start || 0; 166 let last = start + (length || data.length); 167 last = last > data.length ? data.length : last; 168 const container = document.createElement('div'); 169 container.classList.add('liker-list'); 170 let html = `<ul class="${klass || ''}">`; 171 for (let i = start; i < last; ++i) { 172 const user = data[i]; 173 html += ` 174 <li> 175 <a rel="nofollow" title="${user.display_name_esc}" href="${user.profile_url_esc}"> 176 <img src="${user.avatar_url_esc}" alt="${user.display_name_esc}" /> 177 <span class="user-name">${user.display_name_esc}</span> 178 </a> 179 </li> 180 `; 181 } 182 html += '</ul>'; 183 container.innerHTML = html; 184 return container; 185 } 186 187 /** 188 * Render the display of who has liked this comment. The type of 189 * display depends on how many people have liked the comment. 190 * If more than 10 people have liked the comment, this function 191 * renders navigation controls and sets up the Swipe library for 192 * changing between pages. 193 * 194 * @param link the element over which the user is hovering 195 * @param data the results retrieved from the server 196 */ 197 showLikes(link, data) { 198 this.clear(); 199 200 link.dataset.likeCount = data.length; 201 if (data.length === 0) { 202 // No likers after all. 203 hide(this.el); 204 return; 205 } 206 207 this.innerEl.style.padding = '12px'; 208 209 if (data.length < 6) { 210 // Only one column needed. 211 this.innerEl.style.maxWidth = '200px'; 212 this.innerEl.innerHTML = ''; 213 this.innerEl.appendChild(this.getUserBits(data, 'single')); 214 this.setPosition(link); 215 } else if (data.length < 11) { 216 // Two columns, but only one page. 217 this.innerEl.innerHTML = ''; 218 this.innerEl.appendChild(this.getUserBits(data, 'double')); 219 this.setPosition(link); 220 } else { 221 // Multiple pages. 222 this.renderLikesWithPagination(data, link); 223 } 224 } 225 226 /**
227 * Render multiple pages of likes with pagination controls. 228 * This function is intended to be called by `showLikes` above. 229 * 230 * @param data the results retrieved from the server 231 */ 232 renderLikesWithPagination(data, link) { 233 swipeLibLoader().then(() => { 234 const page_count = Math.ceil(data.length / 10); 235 // Swipe requires two nested containers. 236 const swipe = document.createElement('div'); 237 swipe.classList.add('swipe'); 238 this.innerEl.appendChild(swipe); 239 240 const wrap = document.createElement('div'); 241 wrap.classList.add('swipe-wrap'); 242 swipe.appendChild(wrap); 243 244 for (let i = 0; i < page_count; ++i) { 245 wrap.appendChild(this.getUserBits(data, 'double', i * 10, 10)); 246 } 247 248 /** 249 * Navigation controls. 250 * This is based on the Newdash controls found in 251 * reader/recommendations-templates.php 252 */ 253 const nav = document.createElement('nav'); 254 nav.classList.add('slider-nav'); 255 256 let navContents = ` 257 <a href="#" class="prev"> 258 <span class="noticon noticon-previous" title="Previous" alt="<"></span> 259 </a> 260 <span class="position"> 261 `; 262 for (let i = 0; i < page_count; ++i) { 263 navContents += `<em data-page="${i}" class="${i === 0 ? 'on' : ''}">•</em>`; 264 } 265 navContents += ` 266 </span> 267 <a href="#" class="next"> 268 <span class="noticon noticon-next" title="Next" alt=">"></span> 269 </a> 270 `; 271 this.innerEl.appendChild(nav); 272 nav.innerHTML = navContents; 273 274 /** Set up Swipe. **/ 275 // Swipe cannot be set up successfully unless its container 276 // is visible, so we show it now. 277 show(this.el); 278 this.setPosition(link); 279 280 this.swipe = new Swipe(swipe, { 281 callback: function (pos) { 282 // Update the pagination indicators. 283 // 284 // If there are exactly two pages, Swipe has a weird 285 // special case where it duplicates both pages and 286 // can return index 2 and 3 even though those aren't 287 // real pages (see swipe.js, line 47). To deal with 288 // this, we use the expression `pos % page_count`. 289 pos = pos % page_count; 290 nav.querySelectorAll('em').forEach(em => { 291 const page = Number(em.dataset.page); 292 em.setAttribute('class', pos === page ? 'on' : ''); 293 }); 294 }, 295 }); 296 297 nav.querySelectorAll('em').forEach(em => { 298 em.addEventListener('click', e => { 299 // Go to the page corresponding to the indicator clicked. 300 this.swipe.slide(Number(em.dataset.page)); 301 e.preventDefault(); 302 }); 303 }); 304 // Previous and next buttons. 305 nav.querySelector('.prev').addEventListener('click', e => { 306 this.swipe.prev(); 307 e.preventDefault(); 308 }); 309 nav.querySelector('.next').addEventListener('click', e => { 310 this.swipe.next(); 311 e.preventDefault(); 312 }); 313 }); 314 } 315 316 /** 317 * Open the overlay and show a loading message. 318 */ 319 showLoadingMessage(link) { 320 this.clear(); 321 this.innerEl.textContent = comment_like_text.loading; 322 this.setPosition(link); 323 } 324 325 /** 326 * Position the overlay near the current comment. 327 * 328 * @param link element near which to position the overlay 329 */ 330 setPosition(link) { 331 // Prepare a down arrow icon for the bottom of the overlay. 332 const icon = document.createElement('span'); 333 this.el.appendChild(icon); 334 icon.classList.add('icon', 'noticon', 'noticon-downarrow'); 335 icon.style.textShadow = '0px 1px 1px rgb(223, 223, 223)'; 336 337 const rect = link.getBoundingClientRect(); 338 const win = document.defaultView; 339 const offset = { 340 top: rect.top + win.scrollY, 341 left: rect.left + win.scrollX, 342 }; 343 344 // Take measurements with the element fully visible. 345 show(this.el); 346 let left = offset.left - (this.el.offsetWidth - link.offsetWidth) / 2; 347 left = left < 5 ? 5 : left; 348 let top = offset.top - this.el.offsetHeight + 5; 349 hide(this.el); 350 351 const adminBar = document.querySelector('#wpadminbar'); 352 353 // Check if the overlay would appear off the screen. 354 if (top < win.scrollY + ((adminBar && adminBar.offsetHeight) || 0)) { 355 // We'll display the overlay beneath the link instead. 356 top = offset.top + link.offsetHeight; 357 // Instead of using the down arrow icon, use an up arrow. 358 icon.remove(); 359 this.el.prepend(icon); 360 icon.classList.remove('noticon-downarrow'); 361 icon.classList.add('noticon-uparrow'); 362 icon.style.textShadow = '0px -1px 1px rgb(223, 223, 223)'; 363 icon.style.verticalAlign = 'bottom'; 364 } 365 366 this.el.style.left = `${left}px`; 367 this.el.style.top = `${top}px`; 368 show(this.el); 369 370 // The height of the arrow icon differs slightly between browsers, 371 // so we compute the margin here to make sure it isn't disjointed 372 // from the overlay. 373 icon.style.marginTop = `${icon.scrollHeight - 26}px`; 374 icon.style.marginBottom = `${20 - icon.scrollHeight}px`; 375 376 // Position the arrow to be horizontally centred on the link. 377 icon.style.paddingLeft = `${ 378 offset.left - left + (link.offsetWidth - icon.scrollWidth) / 2 379 }px`; 380 } 381 382 /** 383 * Return whether the overlay is visible. 384 */ 385 isVisible() { 386 return this.el.style.getPropertyValue('display') !== 'none'; 387 } 388 389 /** 390 * Request that the overlay be hidden after a short delay. 391 */ 392 requestHide() { 393 if (this.hideTimeout !== null) { 394 return; 395 } 396 this.hideTimeout = setTimeout(() => { 397 hide(this.el); 398 this.clear(); 399 }, 300); 400 } 401 402 /** 403 * Cancel a request to hide the overlay. 404 */ 405 cancelHide() { 406 if (this.hideTimeout !== null) { 407 clearTimeout(this.hideTimeout); 408 this.hideTimeout = null; 409 } 410 } 411 } 412 413 // Overlay used for displaying comment like info.
414 const overlay = new Overlay(); 415 416 // The most recent comment for which the user has requested to see 417 // who liked it. 418 var relevantComment; 419 420 // Precache after this timeout. 421 var precacheTimeout = null; 422 423 /** 424 * Fetch the like data for a particular comment. 425 */ 426 function fetchLikeData(link, commentId) { 427 commentLikeCache[commentId] = null; 428 429 const container = link && link.parentElement && link.parentElement.parentElement; 430 const star = container.querySelector('a.comment-like-link'); 431 star && 432 handleLinkAction(star, 'view_comment_likes', commentId, data => { 433 // Populate the cache. 434 commentLikeCache[commentId] = data; 435 436 // Only show the overlay if the user is interested. 437 if (overlay.isVisible() && relevantComment === commentId) { 438 overlay.showLikes(link, data); 439 } 440 }); 441 } 442 443 function readCookie(c) { 444 const nameEQ = c + '='; 445 const cookieStrings = document.cookie.split(';'); 446 447 for (let i = 0; i < cookieStrings.length; i++) { 448 let cookieString = cookieStrings[i]; 449 while (cookieString.charAt(0) === ' ') { 450 cookieString = cookieString.substring(1, cookieString.length); 451 } 452 if (cookieString.indexOf(nameEQ) === 0) { 453 const chunk = cookieString.substring(nameEQ.length, cookieString.length); 454 const pairs = chunk.split('&'); 455 const cookieData = {}; 456 for (let num = pairs.length - 1; num >= 0; num--) { 457 const pair = pairs[num].split('='); 458 cookieData[pair[0]] = decodeURIComponent(pair[1]); 459 } 460 return cookieData; 461 } 462 } 463 return null; 464 } 465 466 function getServiceData() { 467 const data = readCookie('wpc_wpc'); 468 if (data === null || typeof data.access_token === 'undefined' || !data.access_token) { 469 return false; 470 } 471 return data; 472 } 473 474 function readMessage(msg) { 475 const event = msg.data; 476 477 if (typeof event.event === 'undefined') { 478 return; 479 } 480 481 if (event.event === 'login' && event.success) { 482 extWinCheck = setInterval(function () { 483 if (!extWin || extWin.closed) { 484 clearInterval(extWinCheck); 485 if (getServiceData()) { 486 // Load page in an iframe to get the current comment nonce 487 const nonceIframe = document.createElement('iframe'); 488 nonceIframe.id = 'wp-login-comment-nonce-iframe'; 489 nonceIframe.style.display = 'none'; 490 nonceIframe.src = commentLikeEvent + ''; 491 document.body.appendChild(nonceIframe); 492 493 const commentLikeId = (commentLikeEvent + '') 494 .split('like_comment=')[1] 495 .split('&_wpnonce=')[0]; 496 let c; 497 498 // Set a 5 second timeout to redirect to the comment page without doing the Like as a fallback 499 const commentLikeTimeout = setTimeout(() => { 500 window.location = commentLikeEvent; 501 }, 5000); 502 503 // Check for a new nonced redirect and use that if available before timing out 504 const commentLikeCheck = setInterval(() => { 505 const iframe = document.querySelector('#wp-login-comment-nonce-iframe'); 506 if (iframe) { 507 c = iframe.querySelector(`#comment-like-${commentLikeId} .comment-like-link`); 508 } 509 if (c && typeof c.href !== 'undefined') { 510 clearTimeout(commentLikeTimeout); 511 clearInterval(commentLikeCheck); 512 window.location = c.href; 513 } 514 }, 100); 515 } 516 } 517 }, 100); 518 519 if (extWin) { 520 if (!extWin.closed) { 521 extWin.close(); 522 } 523 extWin = false; 524 } 525 526 stopPolling(); 527 } 528 } 529 530 if (typeof window.postMessage !== 'undefined') { 531 window.addEventListener('message', e => { 532 let message = e && e.data; 533 if (typeof message === 'string') { 534 try { 535 message = JSON.parse(message); 536 } catch (err) { 537 return; 538 } 539 } 540 541 const type = message && message.type; 542 if (type === 'loginMessage') { 543 readMessage(message); 544 } 545 }); 546 } 547 548 document.body.addEventListener('click', e => { 549 let target = e.target; 550 551 // Don't do anything when clicking on the "X people" link. 552 if (target.matches('p.comment-likes a.view-likers')) { 553 e.preventDefault(); 554 return; 555 } 556 557 // Retrieve the surrounding paragraph to the star, if it hasn't been liked. 558 const notLikedPar = target.closest('p.comment-not-liked'); 559 560 // Return if not clicking on star or surrounding paragraph. 561 if (!target.matches('a.comment-like-link') && !notLikedPar) { 562 return; 563 } 564 565 // When a comment hasn't been liked, make the text clickable, too. 566 if (notLikedPar) { 567 target = notLikedPar.querySelector('a.comment-like-link'); 568 if (!target) { 569 return; 570 } 571 } 572 573 if (target.classList.contains('needs-login')) { 574 e.preventDefault(); 575 commentLikeEvent = target; 576 if (extWin) { 577 if (!extWin.closed) { 578 extWin.close(); 579 } 580 extWin = false;
581 } 582 583 stopPolling(); 584 585 const url = 'https://wordpress.com/public.api/connect/?action=request&service=wordpress'; 586 extWin = window.open( 587 url, 588 'likeconn', 589 'status=0,toolbar=0,location=1,menubar=0,directories=0,resizable=1,scrollbars=1,height=560,width=500' 590 ); 591 592 startPolling(); 593 594 return false; 595 } 596 597 // Record that the user likes or does not like this comment. 598 const commentId = getCommentId(target); 599 target.classList.add('loading'); 600 601 let commentEl = document.querySelector(`p#comment-like-${commentId}`); 602 // Determine whether to like or unlike based on whether the comment is 603 // currently liked. 604 const action = 605 commentEl && commentEl.dataset.liked === 'comment-liked' 606 ? 'unlike_comment' 607 : 'like_comment'; 608 handleLinkAction(target, action, commentId, data => { 609 // Invalidate the like cache for this comment. 610 delete commentLikeCache[commentId]; 611 612 const countEl = document.querySelector(`#comment-like-count-${data.context}`); 613 if (countEl) { 614 countEl.innerHTML = data.display; 615 } 616 617 commentEl = document.querySelector(`p#comment-like-${data.context}`); 618 if (action === 'like_comment') { 619 commentEl.classList.remove('comment-not-liked'); 620 commentEl.classList.add('comment-liked'); 621 commentEl.dataset.liked = 'comment-liked'; 622 } else { 623 commentEl.classList.remove('comment-liked'); 624 commentEl.classList.add('comment-not-liked'); 625 commentEl.dataset.liked = 'comment-not-liked'; 626 } 627 628 // Prefetch new data for this comment (if there are likers left). 629 const parent = target.closest('.comment-likes'); 630 const link = parent && parent.querySelector('a.view-likers'); 631 if (link) { 632 fetchLikeData(link, commentId); 633 } 634 635 target.classList.remove('loading'); 636 }); 637 e.preventDefault(); 638 e.stopPropagation(); 639 }); 640 641 document.body.addEventListener( 642 'mouseenter', 643 function (e) { 644 if (!e.target.matches('p.comment-likes a.view-likers')) { 645 return; 646 } 647 // Show the user a list of who has liked this comment. 648 649 const link = e.target; 650 if (Number(link.dataset.likeCount || 0) === 0) { 651 // No one has liked this comment. 652 return; 653 } 654 655 // Don't hide the overlay. 656 overlay.cancelHide(); 657 658 // Get the comment ID. 659 const container = link.parentElement && link.parentElement.parentElement; 660 const star = container && container.querySelector('a.comment-like-link'); 661 const commentId = star && getCommentId(star); 662 relevantComment = commentId; 663 664 // Check if the list of likes for this comment is already in 665 // the cache. 666 if (commentId in commentLikeCache) { 667 const entry = commentLikeCache[commentId];
668 // Only display the likes if the ajax request is 669 // actually done. 670 if (entry !== null) { 671 overlay.showLikes(link, entry); 672 } else { 673 // Make sure the overlay is visible (in case 674 // the user moved the mouse away while loading 675 // but then came back before it finished 676 // loading). 677 overlay.showLoadingMessage(link); 678 } 679 return; 680 } 681 682 // Position the "Loading..." overlay. 683 overlay.showLoadingMessage(link); 684 685 // Fetch the data. 686 fetchLikeData(link, commentId); 687 }, 688 true 689 ); 690 691 document.body.addEventListener( 692 'mouseleave', 693 e => { 694 if (!e.target.matches('p.comment-likes a.view-likers')) { 695 return; 696 } 697 // User has moved cursor away - hide the overlay. 698 overlay.requestHide(); 699 }, 700 true 701 ); 702 703 document.body.addEventListener( 704 'mouseenter', 705 e => { 706 if (!e.target.matches('.comment') || !e.target.querySelector('a.comment-like-link')) { 707 return; 708 } 709 // User is moving over a comment - precache the comment like data.
710 if (precacheTimeout !== null) { 711 clearTimeout(precacheTimeout); 712 precacheTimeout = null; 713 } 714 715 const star = e.target.querySelector('a.comment-like-link'); 716 const parent = star.closest('.comment-likes'); 717 const link = parent && parent.querySelector('a.view-likers'); 718 if (!link || Number(link.dataset.likeCount || 0) === 0) { 719 // No likes. 720 return; 721 } 722 const commentId = getCommentId(star); 723 if (commentId in commentLikeCache) { 724 // Already in cache. 725 return; 726 } 727 728 precacheTimeout = setTimeout(() => { 729 precacheTimeout = null; 730 if (commentId in commentLikeCache) { 731 // Was cached in the interim. 732 return; 733 } 734 fetchLikeData(link, commentId); 735 }, 1000); 736 }, 737 true 738 ); 739 } 740 741 if (document.readyState !== 'loading') { 742 init(); 743 } else { 744 document.addEventListener('DOMContentLoaded', init); 745 } 746})(); 747; 748/*! Backstretch - v2.0.4 - 2013-06-19 749* http://srobbin.com/jquery-plugins/backstretch/ 750* Copyright (c) 2013 Scott Robbin; Licensed MIT */ 751 752;(function ($, window, undefined) { 753 'use strict'; 754 755 /* PLUGIN DEFINITION 756 * ========================= */ 757 758 $.fn.backstretch = function (images, options) { 759 // We need at least one image or method name 760 if (images === undefined || images.length === 0) { 761 $.error("No images were supplied for Backstretch"); 762 } 763 764 /* 765 * Scroll the page one pixel to get the right window height on iOS 766 * Pretty harmless for everyone else 767 */ 768 if ($(window).scrollTop() === 0 ) { 769 window.scrollTo(0, 0); 770 } 771 772 return this.each(function () { 773 var $this = $(this) 774 , obj = $this.data('backstretch'); 775 776 // Do we already have an instance attached to this element? 777 if (obj) { 778 779 // Is this a method they're trying to execute? 780 if (typeof images == 'string' && typeof obj[images] == 'function') { 781 // Call the method 782 obj[images](options); 783 784 // No need to do anything further 785 return; 786 } 787 788 // Merge the old options with the new 789 options = $.extend(obj.options, options); 790 791 // Remove the old instance 792 obj.destroy(true); 793 } 794 795 obj = new Backstretch(this, images, options); 796 $this.data('backstretch', obj); 797 }); 798 }; 799 800 // If no element is supplied, we'll attach to body 801 $.backstretch = function (images, options) { 802 // Return the instance 803 return $('body') 804 .backstretch(images, options) 805 .data('backstretch'); 806 }; 807 808 // Custom selector 809 $.expr[':'].backstretch = function(elem) { 810 return $(elem).data('backstretch') !== undefined; 811 }; 812 813 /* DEFAULTS 814 * ========================= */ 815 816 $.fn.backstretch.defaults = { 817 centeredX: true // Should we center the image on the X axis? 818 , centeredY: true // Should we center the image on the Y axis? 819 , duration: 5000 // Amount of time in between slides (if slideshow) 820 , fade: 0 // Speed of fade transition between slides 821 }; 822 823 /* STYLES 824 * 825 * Baked-in styles that we'll apply to our elements. 826 * In an effort to keep the plugin simple, these are not exposed as options. 827 * That said, anyone can override these in their own stylesheet. 828 * ========================= */ 829 var styles = { 830 wrap: { 831 left: 0 832 , top: 0 833 , overflow: 'hidden' 834 , margin: 0 835 , padding: 0 836 , height: '100%' 837 , width: '100%' 838 , zIndex: -999999 839 } 840 , img: { 841 position: 'absolute' 842 , display: 'none' 843 , margin: 0 844 , padding: 0 845 , border: 'none' 846 , width: 'auto' 847 , height: 'auto' 848 , maxHeight: 'none' 849 , maxWidth: 'none' 850 , zIndex: -999999 851 } 852 }; 853 854 /* CLASS DEFINITION 855 * ========================= */ 856 var Backstretch = function (container, images, options) { 857 this.options = $.extend({}, $.fn.backstretch.defaults, options || {}); 858 859 /* In its simplest form, we allow Backstretch to be called on an image path. 860 * e.g. $.backstretch('/path/to/image.jpg') 861 * So, we need to turn this back into an array. 862 */ 863 this.images = $.isArray(images) ? images : [images]; 864 865 // Preload images 866 $.each(this.images, function () { 867 $('<img />')[0].src = this; 868 }); 869 870 // Convenience reference to know if the container is body. 871 this.isBody = container === document.body; 872 873 /* We're keeping track of a few different elements 874 * 875 * Container: the element that Backstretch was called on. 876 * Wrap: a DIV that we place the image into, so we can hide the overflow. 877 * Root: Convenience reference to help calculate the correct height. 878 */ 879 this.$container = $(container); 880 this.$root = this.isBody ? supportsFixedPosition ? $(window) : $(document) : this.$container; 881 882 // Don't create a new wrap if one already exists (from a previous instance of Backstretch) 883 var $existing = this.$container.children(".backstretch").first(); 884 this.$wrap = $existing.length ? $existing : $('<div class="backstretch"></div>').css(styles.wrap).appendTo(this.$container); 885 886 // Non-body elements need some style adjustments 887 if (!this.isBody) { 888 // If the container is statically positioned, we need to make it relative, 889 // and if no zIndex is defined, we should set it to zero. 890 var position = this.$container.css('position') 891 , zIndex = this.$container.css('zIndex'); 892 893 this.$container.css({ 894 position: position === 'static' ? 'relative' : position 895 , zIndex: zIndex === 'auto' ? 0 : zIndex 896 , background: 'none' 897 }); 898 899 // Needs a higher z-index 900 this.$wrap.css({zIndex: -999998}); 901 } 902 903 // Fixed or absolute positioning? 904 this.$wrap.css({ 905 position: this.isBody && supportsFixedPosition ? 'fixed' : 'absolute' 906 }); 907 908 // Set the first image 909 this.index = 0; 910 this.show(this.index); 911 912 // Listen for resize 913 $(window).on('resize.backstretch', $.proxy(this.resize, this)) 914 .on('orientationchange.backstretch', $.proxy(function () { 915 // Need to do this in order to get the right window height 916 if (this.isBody && window.pageYOffset === 0) { 917 window.scrollTo(0, 1); 918 this.resize(); 919 } 920 }, this)); 921 }; 922 923 /* PUBLIC METHODS 924 * ========================= */ 925 Backstretch.prototype = { 926 resize: function () { 927 try { 928 var bgCSS = {left: 0, top: 0} 929 , rootWidth = this.isBody ? this.$root.width() : this.$root.innerWidth() 930 , bgWidth = rootWidth 931 , rootHeight = this.isBody ? ( window.innerHeight ? window.innerHeight : this.$root.height() ) : this.$root.innerHe
931ight() 932 , bgHeight = bgWidth / this.$img.data('ratio') 933 , bgOffset; 934 935 // Make adjustments based on image ratio 936 if (bgHeight >= rootHeight) { 937 bgOffset = (bgHeight - rootHeight) / 2; 938 if(this.options.centeredY) { 939 bgCSS.top = '-' + bgOffset + 'px'; 940 } 941 } else { 942 bgHeight = rootHeight; 943 bgWidth = bgHeight * this.$img.data('ratio'); 944 bgOffset = (bgWidth - rootWidth) / 2; 945 if(this.options.centeredX) { 946 bgCSS.left = '-' + bgOffset + 'px'; 947 } 948 } 949 950 this.$wrap.css({width: rootWidth, height: rootHeight}) 951 .find('img:not(.deleteable)').css({width: bgWidth, height: bgHeight}).css(bgCSS); 952 } catch(err) { 953 // IE7 seems to trigger resize before the image is loaded. 954 // This try/catch block is a hack to let it fail gracefully. 955 } 956 957 return this; 958 } 959 960 // Show the slide at a certain position 961 , show: function (newIndex) { 962 963 // Validate index 964 if (Math.abs(newIndex) > this.images.length - 1) { 965 return; 966 } 967 968 // Vars 969 var self = this 970 , oldImage = self.$wrap.find('img').addClass('deleteable') 971 , evtOptions = { relatedTarget: self.$container[0] }; 972 973 // Trigger the "before" event 974 self.$container.trigger($.Event('backstretch.before', evtOptions), [self, newIndex]); 975 976 // Set the new index 977 this.index = newIndex; 978 979 // Pause the slideshow 980 clearInterval(self.interval); 981 982 // New image 983 self.$img = $('<img />') 984 .css(styles.img) 985 .bind('load', function (e) { 986 var imgWidth = this.width || $(e.target).width() 987 , imgHeight = this.height || $(e.target).height(); 988 989 // Save the ratio 990 $(this).data('ratio', imgWidth / imgHeight); 991 992 // Show the image, then delete the old one 993 // "speed" option has been deprecated, but we want backwards compatibilty 994 $(this).fadeIn(self.options.speed || self.options.fade, function () { 995 oldImage.remove(); 996 997 // Resume the slideshow 998 if (!self.paused) { 999 self.cycle(); 1000 } 1001 1002 // Trigger the "after" and "show" events 1003 // "show" is being deprecated 1004 $(['after', 'show']).each(function () { 1005 self.$container.trigger($.Event('backstretch.' + this, evtOptions), [self, newIndex]); 1006 }); 1007 }); 1008 1009 // Resize 1010 self.resize(); 1011 }) 1012 .appendTo(self.$wrap); 1013 1014 // Hack for IE img onload event 1015 self.$img.attr('src', self.images[newIndex]); 1016 return self; 1017 } 1018 1019 , next: function () { 1020 // Next slide 1021 return this.show(this.index < this.images.length - 1 ? this.index + 1 : 0); 1022 } 1023 1024 , prev: function () { 1025 // Previous slide 1026 return this.show(this.index === 0 ? this.images.length - 1 : this.index - 1); 1027 } 1028 1029 , pause: function () { 1030 // Pause the slideshow 1031 this.paused = true; 1032 return this; 1033 } 1034 1035 , resume: function () { 1036 // Resume the slideshow 1037 this.paused = false; 1038 this.next(); 1039 return this; 1040 } 1041 1042 , cycle: function () { 1043 // Start/resume the slideshow 1044 if(this.images.length > 1) { 1045 // Clear the interval, just in case 1046 clearInterval(this.interval); 1047 1048 this.interval = setInterval($.proxy(function () { 1049 // Check for paused slideshow 1050 if (!this.paused) { 1051 this.next(); 1052 } 1053 }, this), this.options.duration); 1054 } 1055 return this; 1056 } 1057
1058 , destroy: function (preserveBackground) { 1059 // Stop the resize events 1060 $(window).off('resize.backstretch orientationchange.backstretch'); 1061 1062 // Clear the interval 1063 clearInterval(this.interval); 1064 1065 // Remove Backstretch 1066 if(!preserveBackground) { 1067 this.$wrap.remove(); 1068 } 1069 this.$container.removeData('backstretch'); 1070 } 1071 }; 1072 1073 /* SUPPORTS FIXED POSITION? 1074 * 1075 * Based on code from jQuery Mobile 1.1.0 1076 * http://jquerymobile.com/ 1077 * 1078 * In a nutshell, we need to figure out if fixed positioning is supported. 1079 * Unfortunately, this is very difficult to do on iOS, and usually involves 1080 * injecting content, scrolling the page, etc.. It's ugly. 1081 * jQuery Mobile uses this workaround. 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