lightbox.js
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上传日期:2022-07-22
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- // -----------------------------------------------------------------------------------
- //
- // Lightbox v2.04
- // by Lokesh Dhakar - http://www.lokeshdhakar.com
- // Last Modification: 2/9/08
- //
- // For more information, visit:
- // http://lokeshdhakar.com/projects/lightbox2/
- //
- // Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
- // - Free for use in both personal and commercial projects
- // - Attribution requires leaving author name, author link, and the license info intact.
- //
- // Thanks: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), and Thomas Fuchs(mir.aculo.us) for ideas, libs, and snippets.
- // Artemy Tregubenko (arty.name) for cleanup and help in updating to latest ver of proto-aculous.
- //
- // -----------------------------------------------------------------------------------
- /*
- Table of Contents
- -----------------
- Configuration
- Lightbox Class Declaration
- - initialize()
- - updateImageList()
- - start()
- - changeImage()
- - resizeImageContainer()
- - showImage()
- - updateDetails()
- - updateNav()
- - enableKeyboardNav()
- - disableKeyboardNav()
- - keyboardAction()
- - preloadNeighborImages()
- - end()
-
- Function Calls
- - document.observe()
-
- */
- // -----------------------------------------------------------------------------------
- //
- // Configurationl
- //
- LightboxOptions = Object.extend({
- fileLoadingImage: '/images/loading.gif',
- fileBottomNavCloseImage: '/images/closelabel.gif',
- overlayOpacity: 0.8, // controls transparency of shadow overlay
- animate: true, // toggles resizing animations
- resizeSpeed: 7, // controls the speed of the image resizing animations (1=slowest and 10=fastest)
- borderSize: 10, //if you adjust the padding in the CSS, you will need to update this variable
- // When grouping images this is used to write: Image # of #.
- // Change it for non-english localization
- labelImage: "Image",
- labelOf: "of"
- }, window.LightboxOptions || {});
- // -----------------------------------------------------------------------------------
- var Lightbox = Class.create();
- Lightbox.prototype = {
- imageArray: [],
- activeImage: undefined,
-
- // initialize()
- // Constructor runs on completion of the DOM loading. Calls updateImageList and then
- // the function inserts html at the bottom of the page which is used to display the shadow
- // overlay and the image container.
- //
- initialize: function() {
-
- this.updateImageList();
-
- this.keyboardAction = this.keyboardAction.bindAsEventListener(this);
- if (LightboxOptions.resizeSpeed > 10) LightboxOptions.resizeSpeed = 10;
- if (LightboxOptions.resizeSpeed < 1) LightboxOptions.resizeSpeed = 1;
- this.resizeDuration = LightboxOptions.animate ? ((11 - LightboxOptions.resizeSpeed) * 0.15) : 0;
- this.overlayDuration = LightboxOptions.animate ? 0.2 : 0; // shadow fade in/out duration
- // When Lightbox starts it will resize itself from 250 by 250 to the current image dimension.
- // If animations are turned off, it will be hidden as to prevent a flicker of a
- // white 250 by 250 box.
- var size = (LightboxOptions.animate ? 250 : 1) + 'px';
-
- // Code inserts html at the bottom of the page that looks similar to this:
- //
- // <div id="overlay"></div>
- // <div id="lightbox">
- // <div id="outerImageContainer">
- // <div id="imageContainer">
- // <img id="lightboxImage">
- // <div style="" id="hoverNav">
- // <a href="#" id="prevLink"></a>
- // <a href="#" id="nextLink"></a>
- // </div>
- // <div id="loading">
- // <a href="#" id="loadingLink">
- // <img src="images/loading.gif">
- // </a>
- // </div>
- // </div>
- // </div>
- // <div id="imageDataContainer">
- // <div id="imageData">
- // <div id="imageDetails">
- // <span id="caption"></span>
- // <span id="numberDisplay"></span>
- // </div>
- // <div id="bottomNav">
- // <a href="#" id="bottomNavClose">
- // <img src="images/close.gif">
- // </a>
- // </div>
- // </div>
- // </div>
- // </div>
- var objBody = $$('body')[0];
- objBody.appendChild(Builder.node('div',{id:'overlay'}));
-
- objBody.appendChild(Builder.node('div',{id:'lightbox'}, [
- Builder.node('div',{id:'outerImageContainer'},
- Builder.node('div',{id:'imageContainer'}, [
- Builder.node('img',{id:'lightboxImage'}),
- Builder.node('div',{id:'hoverNav'}, [
- Builder.node('a',{id:'prevLink', href: '#' }),
- Builder.node('a',{id:'nextLink', href: '#' })
- ]),
- Builder.node('div',{id:'loading'},
- Builder.node('a',{id:'loadingLink', href: '#' },
- Builder.node('img', {src: LightboxOptions.fileLoadingImage})
- )
- )
- ])
- ),
- Builder.node('div', {id:'imageDataContainer'},
- Builder.node('div',{id:'imageData'}, [
- Builder.node('div',{id:'imageDetails'}, [
- Builder.node('span',{id:'caption'}),
- Builder.node('span',{id:'numberDisplay'})
- ]),
- Builder.node('div',{id:'bottomNav'},
- Builder.node('a',{id:'bottomNavClose', href: '#' },
- Builder.node('img', { src: LightboxOptions.fileBottomNavCloseImage })
- )
- )
- ])
- )
- ]));
- $('overlay').hide().observe('click', (function() { this.end(); }).bind(this));
- $('lightbox').hide().observe('click', (function(event) { if (event.element().id == 'lightbox') this.end(); }).bind(this));
- $('outerImageContainer').setStyle({ width: size, height: size });
- $('prevLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage - 1); }).bindAsEventListener(this));
- $('nextLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage + 1); }).bindAsEventListener(this));
- $('loadingLink').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
- $('bottomNavClose').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
- var th = this;
- (function(){
- var ids =
- 'overlay lightbox outerImageContainer imageContainer lightboxImage hoverNav prevLink nextLink loading loadingLink ' +
- 'imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose';
- $w(ids).each(function(id){ th[id] = $(id); });
- }).defer();
- },
- //
- // updateImageList()
- // Loops through anchor tags looking for 'lightbox' references and applies onclick
- // events to appropriate links. You can rerun after dynamically adding images w/ajax.
- //
- updateImageList: function() {
- this.updateImageList = Prototype.emptyFunction;
- document.observe('click', (function(event){
- var target = event.findElement('a[rel^=lightbox]') || event.findElement('area[rel^=lightbox]');
- if (target) {
- event.stop();
- this.start(target);
- }
- }).bind(this));
- },
-
- //
- // start()
- // Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
- //
- start: function(imageLink) {
- $$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'hidden' });
- // stretch overlay to fill page and fade in
- var arrayPageSize = this.getPageSize();
- $('overlay').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });
- new Effect.Appear(this.overlay, { duration: this.overlayDuration, from: 0.0, to: LightboxOptions.overlayOpacity });
- this.imageArray = [];
- var imageNum = 0;
- if ((imageLink.rel == 'lightbox')){
- // if image is NOT part of a set, add single image to imageArray
- this.imageArray.push([imageLink.href, imageLink.title]);
- } else {
- // if image is part of a set..
- this.imageArray =
- $$(imageLink.tagName + '[href][rel="' + imageLink.rel + '"]').
- collect(function(anchor){ return [anchor.href, anchor.title]; }).
- uniq();
-
- while (this.imageArray[imageNum][0] != imageLink.href) { imageNum++; }
- }
- // calculate top and left offset for the lightbox
- var arrayPageScroll = document.viewport.getScrollOffsets();
- var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);
- var lightboxLeft = arrayPageScroll[0];
- this.lightbox.setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' }).show();
-
- this.changeImage(imageNum);
- },
- //
- // changeImage()
- // Hide most elements and preload image in preparation for resizing image container.
- //
- changeImage: function(imageNum) {
-
- this.activeImage = imageNum; // update global var
- // hide elements during transition
- if (LightboxOptions.animate) this.loading.show();
- this.lightboxImage.hide();
- this.hoverNav.hide();
- this.prevLink.hide();
- this.nextLink.hide();
- // HACK: Opera9 does not currently support scriptaculous opacity and appear fx
- this.imageDataContainer.setStyle({opacity: .0001});
- this.numberDisplay.hide();
-
- var imgPreloader = new Image();
-
- // once image is preloaded, resize image container
- imgPreloader.onload = (function(){
- this.lightboxImage.src = this.imageArray[this.activeImage][0];
- this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
- }).bind(this);
- imgPreloader.src = this.imageArray[this.activeImage][0];
- },
- //
- // resizeImageContainer()
- //
- resizeImageContainer: function(imgWidth, imgHeight) {
- // get current width and height
- var widthCurrent = this.outerImageContainer.getWidth();
- var heightCurrent = this.outerImageContainer.getHeight();
- // get new width and height
- var widthNew = (imgWidth + LightboxOptions.borderSize * 2);
- var heightNew = (imgHeight + LightboxOptions.borderSize * 2);
- // scalars based on change from old to new
- var xScale = (widthNew / widthCurrent) * 100;
- var yScale = (heightNew / heightCurrent) * 100;
- // calculate size difference between new and old image, and resize if necessary
- var wDiff = widthCurrent - widthNew;
- var hDiff = heightCurrent - heightNew;
- if (hDiff != 0) new Effect.Scale(this.outerImageContainer, yScale, {scaleX: false, duration: this.resizeDuration, queue: 'front'});
- if (wDiff != 0) new Effect.Scale(this.outerImageContainer, xScale, {scaleY: false, duration: this.resizeDuration, delay: this.resizeDuration});
- // if new and old image are same size and no scaling transition is necessary,
- // do a quick pause to prevent image flicker.
- var timeout = 0;
- if ((hDiff == 0) && (wDiff == 0)){
- timeout = 100;
- if (Prototype.Browser.IE) timeout = 250;
- }
- (function(){
- this.prevLink.setStyle({ height: imgHeight + 'px' });
- this.nextLink.setStyle({ height: imgHeight + 'px' });
- this.imageDataContainer.setStyle({ width: widthNew + 'px' });
- this.showImage();
- }).bind(this).delay(timeout / 1000);
- },
-
- //
- // showImage()
- // Display image and begin preloading neighbors.
- //
- showImage: function(){
- this.loading.hide();
- new Effect.Appear(this.lightboxImage, {
- duration: this.resizeDuration,
- queue: 'end',
- afterFinish: (function(){ this.updateDetails(); }).bind(this)
- });
- this.preloadNeighborImages();
- },
- //
- // updateDetails()
- // Display caption, image number, and bottom nav.
- //
- updateDetails: function() {
-
- // if caption is not null
- if (this.imageArray[this.activeImage][1] != ""){
- this.caption.update(this.imageArray[this.activeImage][1]).show();
- }
-
- // if image is part of set display 'Image x of x'
- if (this.imageArray.length > 1){
- this.numberDisplay.update( LightboxOptions.labelImage + ' ' + (this.activeImage + 1) + ' ' + LightboxOptions.labelOf + ' ' + this.imageArray.length).show();
- }
- new Effect.Parallel(
- [
- new Effect.SlideDown(this.imageDataContainer, { sync: true, duration: this.resizeDuration, from: 0.0, to: 1.0 }),
- new Effect.Appear(this.imageDataContainer, { sync: true, duration: this.resizeDuration })
- ],
- {
- duration: this.resizeDuration,
- afterFinish: (function() {
- // update overlay size and update nav
- var arrayPageSize = this.getPageSize();
- this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });
- this.updateNav();
- }).bind(this)
- }
- );
- },
- //
- // updateNav()
- // Display appropriate previous and next hover navigation.
- //
- updateNav: function() {
- this.hoverNav.show();
- // if not first image in set, display prev image button
- if (this.activeImage > 0) this.prevLink.show();
- // if not last image in set, display next image button
- if (this.activeImage < (this.imageArray.length - 1)) this.nextLink.show();
-
- this.enableKeyboardNav();
- },
- //
- // enableKeyboardNav()
- //
- enableKeyboardNav: function() {
- document.observe('keydown', this.keyboardAction);
- },
- //
- // disableKeyboardNav()
- //
- disableKeyboardNav: function() {
- document.stopObserving('keydown', this.keyboardAction);
- },
- //
- // keyboardAction()
- //
- keyboardAction: function(event) {
- var keycode = event.keyCode;
- var escapeKey;
- if (event.DOM_VK_ESCAPE) { // mozilla
- escapeKey = event.DOM_VK_ESCAPE;
- } else { // ie
- escapeKey = 27;
- }
- var key = String.fromCharCode(keycode).toLowerCase();
-
- if (key.match(/x|o|c/) || (keycode == escapeKey)){ // close lightbox
- this.end();
- } else if ((key == 'p') || (keycode == 37)){ // display previous image
- if (this.activeImage != 0){
- this.disableKeyboardNav();
- this.changeImage(this.activeImage - 1);
- }
- } else if ((key == 'n') || (keycode == 39)){ // display next image
- if (this.activeImage != (this.imageArray.length - 1)){
- this.disableKeyboardNav();
- this.changeImage(this.activeImage + 1);
- }
- }
- },
- //
- // preloadNeighborImages()
- // Preload previous and next images.
- //
- preloadNeighborImages: function(){
- var preloadNextImage, preloadPrevImage;
- if (this.imageArray.length > this.activeImage + 1){
- preloadNextImage = new Image();
- preloadNextImage.src = this.imageArray[this.activeImage + 1][0];
- }
- if (this.activeImage > 0){
- preloadPrevImage = new Image();
- preloadPrevImage.src = this.imageArray[this.activeImage - 1][0];
- }
-
- },
- //
- // end()
- //
- end: function() {
- this.disableKeyboardNav();
- this.lightbox.hide();
- new Effect.Fade(this.overlay, { duration: this.overlayDuration });
- $$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'visible' });
- },
- //
- // getPageSize()
- //
- getPageSize: function() {
-
- var xScroll, yScroll;
-
- if (window.innerHeight && window.scrollMaxY) {
- xScroll = window.innerWidth + window.scrollMaxX;
- 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
- if(document.documentElement.clientWidth){
- windowWidth = document.documentElement.clientWidth;
- } else {
- 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 = xScroll;
- } else {
- pageWidth = windowWidth;
- }
- return [pageWidth,pageHeight];
- }
- }
- document.observe('dom:loaded', function () { new Lightbox(); });