646 lines
19 KiB
JavaScript
646 lines
19 KiB
JavaScript
// -----------------------------------------------------------------------------------
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//
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// Lightbox v2.04
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// by Lokesh Dhakar - http://www.lokeshdhakar.com
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// Last Modification: 2/9/08
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//
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// For more information, visit:
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// http://lokeshdhakar.com/projects/lightbox2/
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//
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// Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
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// - Free for use in both personal and commercial projects
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// - Attribution requires leaving author name, author link, and the license info intact.
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//
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// Thanks: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), and Thomas Fuchs(mir.aculo.us) for ideas, libs, and snippets.
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// Artemy Tregubenko (arty.name) for cleanup and help in updating to latest ver of proto-aculous.
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//
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// -----------------------------------------------------------------------------------
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/*
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Table of Contents
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-----------------
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Configuration
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Lightbox Class Declaration
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- initialize()
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- updateImageList()
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- start()
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- changeImage()
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- resizeImageContainer()
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- showImage()
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- updateDetails()
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- updateNav()
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- enableKeyboardNav()
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- disableKeyboardNav()
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- keyboardAction()
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- preloadNeighborImages()
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- end()
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Function Calls
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- document.observe()
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*/
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// -----------------------------------------------------------------------------------
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//
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// Configurationl
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//
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LightboxOptions = Object.extend(
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{
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fileLoadingImage: "images/loading.gif",
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fileBottomNavCloseImage: "images/closelabel.gif",
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overlayOpacity: 0.8, // controls transparency of shadow overlay
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animate: true, // toggles resizing animations
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resizeSpeed: 7, // controls the speed of the image resizing animations (1=slowest and 10=fastest)
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borderSize: 10, //if you adjust the padding in the CSS, you will need to update this variable
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// When grouping images this is used to write: Image # of #.
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// Change it for non-english localization
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labelImage: "",
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labelOf: " /",
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},
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window.LightboxOptions || {},
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);
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// -----------------------------------------------------------------------------------
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var Lightbox = Class.create();
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Lightbox.prototype = {
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imageArray: [],
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activeImage: undefined,
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// initialize()
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// Constructor runs on completion of the DOM loading. Calls updateImageList and then
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// the function inserts html at the bottom of the page which is used to display the shadow
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// overlay and the image container.
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//
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initialize: function () {
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this.updateImageList();
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this.keyboardAction = this.keyboardAction.bindAsEventListener(this);
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if (LightboxOptions.resizeSpeed > 10) LightboxOptions.resizeSpeed = 10;
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if (LightboxOptions.resizeSpeed < 1) LightboxOptions.resizeSpeed = 1;
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this.resizeDuration = LightboxOptions.animate
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? (11 - LightboxOptions.resizeSpeed) * 0.15
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: 0;
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this.overlayDuration = LightboxOptions.animate ? 0.2 : 0; // shadow fade in/out duration
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// When Lightbox starts it will resize itself from 250 by 250 to the current image dimension.
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// If animations are turned off, it will be hidden as to prevent a flicker of a
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// white 250 by 250 box.
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var size = (LightboxOptions.animate ? 250 : 1) + "px";
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// Code inserts html at the bottom of the page that looks similar to this:
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//
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// <div id="overlay"></div>
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// <div id="lightbox">
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// <div id="outerImageContainer">
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// <div id="imageContainer">
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// <img id="lightboxImage">
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// <div style="" id="hoverNav">
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// <a href="#" id="prevLink"></a>
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// <a href="#" id="nextLink"></a>
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// </div>
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// <div id="loading">
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// <a href="#" id="loadingLink">
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// <img src="images/loading.gif">
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// </a>
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// </div>
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// </div>
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// </div>
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// <div id="imageDataContainer">
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// <div id="imageData">
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// <div id="imageDetails">
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// <span id="caption"></span>
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// <span id="numberDisplay"></span>
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// </div>
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// <div id="bottomNav">
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// <a href="#" id="bottomNavClose">
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// <img src="images/close.gif">
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// </a>
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// </div>
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// </div>
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// </div>
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// </div>
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var objBody = $$("body")[0];
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objBody.appendChild(Builder.node("div", { id: "overlay" }));
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objBody.appendChild(
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Builder.node("div", { id: "lightbox" }, [
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Builder.node(
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"div",
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{ id: "outerImageContainer" },
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Builder.node("div", { id: "imageContainer" }, [
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Builder.node("img", { id: "lightboxImage" }),
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Builder.node("div", { id: "hoverNav" }, [
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Builder.node("a", { id: "prevLink", href: "#" }),
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Builder.node("a", { id: "nextLink", href: "#" }),
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]),
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Builder.node(
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"div",
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{ id: "loading" },
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Builder.node(
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"a",
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{ id: "loadingLink", href: "#" },
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Builder.node("img", { src: LightboxOptions.fileLoadingImage }),
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),
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),
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]),
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),
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Builder.node(
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"div",
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{ id: "imageDataContainer" },
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Builder.node("div", { id: "imageData" }, [
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Builder.node("div", { id: "imageDetails" }, [
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Builder.node("span", { id: "caption" }),
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Builder.node("span", { id: "numberDisplay" }),
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]),
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Builder.node(
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"div",
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{ id: "bottomNav" },
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Builder.node(
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"a",
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{ id: "bottomNavClose", href: "#" },
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Builder.node("img", {
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src: LightboxOptions.fileBottomNavCloseImage,
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}),
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),
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),
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]),
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),
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]),
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);
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$("overlay")
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.hide()
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.observe(
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"click",
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function () {
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this.end();
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}.bind(this),
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);
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$("lightbox")
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.hide()
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.observe(
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"click",
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function (event) {
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if (event.element().id == "lightbox") this.end();
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}.bind(this),
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);
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$("outerImageContainer").setStyle({ width: size, height: size });
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$("prevLink").observe(
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"click",
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function (event) {
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event.stop();
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this.changeImage(this.activeImage - 1);
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}.bindAsEventListener(this),
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);
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$("nextLink").observe(
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"click",
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function (event) {
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event.stop();
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this.changeImage(this.activeImage + 1);
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}.bindAsEventListener(this),
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);
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$("loadingLink").observe(
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"click",
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function (event) {
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event.stop();
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this.end();
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}.bind(this),
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);
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$("bottomNavClose").observe(
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"click",
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function (event) {
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event.stop();
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this.end();
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}.bind(this),
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);
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var th = this;
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(function () {
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var ids =
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"overlay lightbox outerImageContainer imageContainer lightboxImage hoverNav prevLink nextLink loading loadingLink " +
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"imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose";
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$w(ids).each(function (id) {
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th[id] = $(id);
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});
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}).defer();
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},
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//
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// updateImageList()
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// Loops through anchor tags looking for 'lightbox' references and applies onclick
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// events to appropriate links. You can rerun after dynamically adding images w/ajax.
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//
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updateImageList: function () {
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this.updateImageList = Prototype.emptyFunction;
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document.observe(
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"click",
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function (event) {
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var target =
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event.findElement("a[rel^=lightbox]") ||
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event.findElement("area[rel^=lightbox]");
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if (target) {
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event.stop();
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this.start(target);
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}
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}.bind(this),
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);
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},
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//
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// start()
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// Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
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//
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start: function (imageLink) {
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$$("select", "object", "embed").each(function (node) {
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node.style.visibility = "hidden";
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});
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// stretch overlay to fill page and fade in
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var arrayPageSize = this.getPageSize();
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$("overlay").setStyle({
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width: arrayPageSize[0] + "px",
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height: arrayPageSize[1] + "px",
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});
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new Effect.Appear(this.overlay, {
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duration: this.overlayDuration,
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from: 0.0,
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to: LightboxOptions.overlayOpacity,
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});
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this.imageArray = [];
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var imageNum = 0;
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if (imageLink.rel == "lightbox") {
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// if image is NOT part of a set, add single image to imageArray
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this.imageArray.push([imageLink.href, imageLink.title]);
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} else {
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// if image is part of a set..
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this.imageArray = $$(
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imageLink.tagName + '[href][rel="' + imageLink.rel + '"]',
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)
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.collect(function (anchor) {
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return [anchor.href, anchor.title];
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})
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.uniq();
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while (this.imageArray[imageNum][0] != imageLink.href) {
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imageNum++;
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}
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}
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// calculate top and left offset for the lightbox
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var arrayPageScroll = document.viewport.getScrollOffsets();
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var lightboxTop = arrayPageScroll[1] + document.viewport.getHeight() / 80;
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var lightboxLeft = arrayPageScroll[0];
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this.lightbox
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.setStyle({ top: lightboxTop + "px", left: lightboxLeft + "px" })
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.show();
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this.changeImage(imageNum);
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},
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//
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// changeImage()
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// Hide most elements and preload image in preparation for resizing image container.
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//
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changeImage: function (imageNum) {
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this.activeImage = imageNum; // update global var
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// hide elements during transition
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if (LightboxOptions.animate) this.loading.show();
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this.lightboxImage.hide();
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this.hoverNav.hide();
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this.prevLink.hide();
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this.nextLink.hide();
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// HACK: Opera9 does not currently support scriptaculous opacity and appear fx
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this.imageDataContainer.setStyle({ opacity: 0.0001 });
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this.numberDisplay.hide();
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var imgPreloader = new Image();
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// once image is preloaded, resize image container
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imgPreloader.onload = function () {
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this.lightboxImage.src = this.imageArray[this.activeImage][0];
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this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
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}.bind(this);
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imgPreloader.src = this.imageArray[this.activeImage][0];
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},
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//
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// resizeImageContainer()
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//
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resizeImageContainer: function (imgWidth, imgHeight) {
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// get current width and height
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var widthCurrent = this.outerImageContainer.getWidth();
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var heightCurrent = this.outerImageContainer.getHeight();
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// get viewport size
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var arrayPageSize = this.getPageSize();
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var windowWidth = arrayPageSize[2];
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var windowHeight = arrayPageSize[3];
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// Calculate the maximum allowable width and height for the image.
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// This is the viewport size minus padding and the caption area height.
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// The 'borderSize * 4' provides horizontal and vertical padding.
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var maxImageWidth = windowWidth - LightboxOptions.borderSize * 4;
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var maxImageHeight =
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windowHeight -
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LightboxOptions.borderSize * 4 -
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this.imageDataContainer.getHeight();
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// If the image is wider than the max allowable width,
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// scale it down and adjust the height to maintain the aspect ratio.
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if (imgWidth > maxImageWidth) {
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imgHeight = imgHeight * (maxImageWidth / imgWidth);
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imgWidth = maxImageWidth;
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}
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// If the image is taller than the max allowable height,
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// scale it down and adjust the width to maintain the aspect ratio.
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// This check is done after the width check to handle images that are both too wide and too tall.
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if (imgHeight > maxImageHeight) {
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imgWidth = imgWidth * (maxImageHeight / imgHeight);
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imgHeight = maxImageHeight;
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}
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// get new width and height
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var widthNew = imgWidth + LightboxOptions.borderSize * 2;
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var heightNew = imgHeight + LightboxOptions.borderSize * 2;
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// scalars based on change from old to new
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var xScale = (widthNew / widthCurrent) * 100;
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var yScale = (heightNew / heightCurrent) * 100;
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// calculate size difference between new and old image, and resize if necessary
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var wDiff = widthCurrent - widthNew;
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var hDiff = heightCurrent - heightNew;
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if (hDiff != 0)
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new Effect.Scale(this.outerImageContainer, yScale, {
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scaleX: false,
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duration: this.resizeDuration,
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queue: "front",
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});
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if (wDiff != 0)
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new Effect.Scale(this.outerImageContainer, xScale, {
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scaleY: false,
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duration: this.resizeDuration,
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delay: this.resizeDuration,
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});
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// if new and old image are same size and no scaling transition is necessary,
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// do a quick pause to prevent image flicker.
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var timeout = 0;
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if (hDiff == 0 && wDiff == 0) {
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timeout = 100;
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if (Prototype.Browser.IE) timeout = 250;
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}
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(function () {
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this.prevLink.setStyle({ height: imgHeight + "px" });
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this.nextLink.setStyle({ height: imgHeight + "px" });
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this.imageDataContainer.setStyle({ width: widthNew + "px" });
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this.showImage();
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})
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.bind(this)
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.delay(timeout / 1000);
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},
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//
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// showImage()
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// Display image and begin preloading neighbors.
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//
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showImage: function () {
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this.loading.hide();
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new Effect.Appear(this.lightboxImage, {
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duration: this.resizeDuration,
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queue: "end",
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afterFinish: function () {
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this.updateDetails();
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}.bind(this),
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});
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this.preloadNeighborImages();
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},
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//
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// updateDetails()
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// Display caption, image number, and bottom nav.
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//
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updateDetails: function () {
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// if caption is not null
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if (this.imageArray[this.activeImage][1] != "") {
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this.caption.update(this.imageArray[this.activeImage][1]).show();
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}
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// if image is part of set display 'Image x of x'
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if (this.imageArray.length > 1) {
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this.numberDisplay
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.update(
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LightboxOptions.labelImage +
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" " +
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(this.activeImage + 1) +
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" " +
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LightboxOptions.labelOf +
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" " +
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this.imageArray.length,
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)
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.show();
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}
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new Effect.Parallel(
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[
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new Effect.SlideDown(this.imageDataContainer, {
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sync: true,
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duration: this.resizeDuration,
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from: 0.0,
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to: 1.0,
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}),
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new Effect.Appear(this.imageDataContainer, {
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sync: true,
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duration: this.resizeDuration,
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}),
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],
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{
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duration: this.resizeDuration,
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afterFinish: function () {
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// update overlay size and update nav
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var arrayPageSize = this.getPageSize();
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this.overlay.setStyle({ height: arrayPageSize[1] + "px" });
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this.updateNav();
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}.bind(this),
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},
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);
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},
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//
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// updateNav()
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// Display appropriate previous and next hover navigation.
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//
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updateNav: function () {
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this.hoverNav.show();
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// if not first image in set, display prev image button
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if (this.activeImage > 0) this.prevLink.show();
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// if not last image in set, display next image button
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if (this.activeImage < this.imageArray.length - 1) this.nextLink.show();
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this.enableKeyboardNav();
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},
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//
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// enableKeyboardNav()
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//
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enableKeyboardNav: function () {
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document.observe("keydown", this.keyboardAction);
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},
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//
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// disableKeyboardNav()
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//
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disableKeyboardNav: function () {
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document.stopObserving("keydown", this.keyboardAction);
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},
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//
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// keyboardAction()
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//
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keyboardAction: function (event) {
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var keycode = event.keyCode;
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var escapeKey;
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if (event.DOM_VK_ESCAPE) {
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// mozilla
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escapeKey = event.DOM_VK_ESCAPE;
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} else {
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// ie
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escapeKey = 27;
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}
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var key = String.fromCharCode(keycode).toLowerCase();
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if (key.match(/x|o|c/) || keycode == escapeKey) {
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// close lightbox
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this.end();
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} else if (key == "p" || keycode == 37) {
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// display previous image
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if (this.activeImage != 0) {
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this.disableKeyboardNav();
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this.changeImage(this.activeImage - 1);
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}
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} else if (key == "n" || keycode == 39) {
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// display next image
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if (this.activeImage != this.imageArray.length - 1) {
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this.disableKeyboardNav();
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this.changeImage(this.activeImage + 1);
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}
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}
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},
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//
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// preloadNeighborImages()
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// Preload previous and next images.
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//
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preloadNeighborImages: function () {
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var preloadNextImage, preloadPrevImage;
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if (this.imageArray.length > this.activeImage + 1) {
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preloadNextImage = new Image();
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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, windowWidth, windowHeight];
|
|
},
|
|
};
|
|
|
|
document.observe("dom:loaded", function () {
|
|
new Lightbox();
|
|
});
|