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quickslide.js
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quickslide.js
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(function (root, factory) {
// Asynchronous module definition, as per
// https://github.com/umdjs/umd/blob/master/amdWeb.js
if (typeof define === 'function' && define.amd) {
define(factory);
} else {
root.QuickSlide = factory();
}
}(this, function () {
"use strict";
var popupImg,
popupBox,
dimmer, popupCaption,
// Interval timer used when polling an Image object for size info.
sizeTimer,
// These three are event normalisation functions based on examples in
// 'Eloquent JavaScript', by Marijn Haverbeke:
// http://eloquentjavascript.net/chapter13.html
normalizeEvent, addListener, triggerEvent,
// Other functions:
createPopup, setupGalleryLinks, setPopup, recenterBox, showImage,
hidePopup, applyConfig;
var config = {
//max_width: 800,
//max_height: 600,
use_dimmer: false,
absolute_position: false,
show_caption: true,
auto_fit: true,
auto_detect: false,
no_wait: false
};
// Bail out immediately if there's already a QuickSlide box on the page.
if (document.getElementById("quickslide-popup-box") ||
document.getElementById("lightbox")) {
return;
}
normalizeEvent = function (e) {
// Make the event object standard within event handlers.
if (!e.stopPropagation) {
e.stopPropagation = function () {
this.cancelBubble = true;
};
e.preventDefault = function () {
this.returnValue = false;
};
}
if (e.srcElement && !e.target) {
e.target = e.srcElement;
}
return e;
};
addListener = function (node, type, handler) {
// Cross-browser event handler binding.
var wrapHandler = function (e) {
// Make 'this' inside the handler refer to the 'node' parameter.
handler.apply(node, [normalizeEvent(e || window.event)]);
};
if (node.attachEvent) {
// Attach handler for IE.
node.attachEvent("on" + type, wrapHandler);
} else {
// Attach handler for standards-compliant browsers.
node.addEventListener(type, wrapHandler, false);
}
return { node: node, type: type, handler: wrapHandler };
};
triggerEvent = function (node, type) {
// Cross-browser event triggering.
var evt;
if (document.createEventObject) {
// Dispatch for IE.
evt = document.createEventObject();
return node.fireEvent("on" + type, evt);
} else {
// Dispatch for standards-compliant browsers.
evt = document.createEvent("HTMLEvents");
evt.initEvent(type, true, true); // event type, bubbling, cancelable
return !node.dispatchEvent(evt);
}
};
setupGalleryLinks = function () {
/* Attach a click handler to the document body that listens for clicks,
* then if the clicked element is not one we're interested in, traverse
* up the DOM tree until we reach either an element we're interested
* in, or the document body.
*
* This replaces the need to set click handlers on each individual link
* element, so it still works even on elements that are added
* dynamically after page load.
*/
var isImageLink, isQ;
isImageLink = function (link) {
// Checks whether the given link's "href" attribute ends in an
// image-related extension, and the link doesn't contain '=http',
// which usually indicates a redirect to another domain, not an
// actual image URL.
// Also returns false if the link already has a click handler,
// albeit only the old-style assignation, since browser support for
// element.eventListenerList is limited as of April 2012.
var href = link.getAttribute("href"),
imgExt = /\.(jp(e?)g|png|gif)$/i,
redirect = /=http/;
return imgExt.test(href) && !redirect.test(href) && !link.onclick;
};
isQ = function (testEl) {
// Returns true if the given element is a valid link to an
// image.
var nodeName = testEl.nodeName.toUpperCase(),
rel = (testEl.getAttribute("rel") || "").toUpperCase();
return nodeName === "A" && (rel === "QUICKSLIDE" ||
(config.auto_detect && isImageLink(testEl)));
};
// Function similar to jQuery's .live() or .delegate().
addListener(document.body, "click", function (e) {
var el = e.target;
// Ignore clicks if shift is held.
if (e.shiftKey) {
e.shiftKey = false;
return false;
}
// Ignore middle-clicks.
if (e.button && e.button === 1) {
return true;
}
// Traverse up the tree.
while (el && !isQ(el) && el !== this) {
el = el.parentNode;
}
if (el && isQ(el)) {
e.preventDefault();
setPopup(el);
}
});
};
recenterBox = function (box, srcImg) {
// Puts the popup box in the centre of the window, based on the size of
// the given image. If the image is larger than the window it is scaled
// down to fit, if that option is specified in config.
// If no image is given, position is based on the size of the empty box
// (including padding and border).
var bs = box.style, cw, ch, scrollTop = document.body.scrollTop ||
(document.documentElement && document.documentElement.scrollTop),
px = 0, py = 0, w, h, cr,
mw = config.max_width, mh = config.max_height;
// Get size of browser window.
cw = window.innerWidth || document.documentElement.clientWidth;
ch = window.innerHeight || document.documentElement.clientHeight;
if (srcImg) {
w = srcImg.width;
h = srcImg.height;
// Similar to calculations for fitting to window, but these don't need
// to take box padding/borders into account.
if (mw && w > mw) {
h = Math.round(h * mw / w);
w = mw;
// Need to specify max in both dimensions otherwise IE8 doesn't
// scale the image proportionally.
srcImg.style.maxWidth = mw + "px";
srcImg.style.maxHeight = h + "px";
}
if (mh && h > mh) {
w = Math.round(w * mh / h);
h = mh;
srcImg.style.maxHeight = mh + "px";
srcImg.style.maxWidth = w + "px";
}
// Prevent caption being wider than image, as it looks wrong. May
// still look odd if auto_fit is enabled and the caption is really
// long (wider than the whole browser window).
if (config.show_caption) {
popupCaption.style.maxWidth = w + "px";
}
// Calculate how much space the box's padding, borders and caption
// take up.
px = box.offsetWidth - w;
py = box.offsetHeight - h;
// Scale image to fit in window, taking its container box's borders
// and padding into account.
if (config.auto_fit !== false) {
if (w + px > cw) {
h = Math.round(h * (cw - px) / w);
w = cw - px;
srcImg.style.maxWidth = w + "px";
srcImg.style.maxHeight = h + "px";
}
if (h + py > ch) {
w = Math.round(w * (ch - py) / h);
h = ch - py;
srcImg.style.maxHeight = h + "px";
srcImg.style.maxWidth = w + "px";
}
}
} else { // no image given
cr = box.getBoundingClientRect();
w = cr.right - cr.left;
h = cr.bottom - cr.top;
}
bs.top = (Math.round((ch - h) / 2) +
(config.absolute_position ? scrollTop : 0) -
(py / 2)) + "px";
bs.left = (Math.round((cw - w) / 2) - px / 2) + "px";
};
setPopup = function (fromNode) {
if (config.use_dimmer) {
dimmer.style.display = "";
//document.body.appendChild(dimmer);
}
//document.body.appendChild(popupBox);
popupBox.className = "loading";
popupBox.style.display = "";
recenterBox(popupBox);
if (popupImg && popupImg.parentNode === popupBox) {
popupBox.removeChild(popupImg);
}
// Need to create a new image because if we just change the .src
// property, IE9 doesn't update the width and height once the new image
// loads, so all images display at the same size as the first one to be
// opened.
popupImg = document.createElement("img");
popupImg.className = "quickslide-image";
popupImg.style.display = "none";
addListener(popupImg, "error", function () {
if (!popupImg.width && !popupImg.height) {
//alert("There was a problem loading the image.\n\nThe server might have taken too long to respond, or the image might have been deleted.");
hidePopup();
window.location = popupImg.src;
}
});
if (config.show_caption) {
popupCaption.style.display = "none";
popupCaption.innerHTML = fromNode.getAttribute("title");
}
addListener(popupImg, "load", function () {
popupBox.className = "loaded";
});
// Start loading image.
popupImg.src = fromNode.getAttribute("href");
sizeTimer = setInterval(function () {
if (popupImg.width || popupImg.height) {
clearInterval(sizeTimer);
showImage();
}
}, 100);
};
showImage = function () {
// Handler for when the full-sized image is ready to be shown in the
// popup.
popupBox.className = "";
popupImg.style.display = "";
if (config.show_caption) {
popupBox.insertBefore(popupImg, popupCaption);
popupCaption.style.display = "";
} else {
popupBox.appendChild(popupImg);
}
recenterBox(popupBox, popupImg);
};
hidePopup = function () {
clearInterval(sizeTimer);
if (popupBox.parentNode === document.body) {
popupBox.style.display = "none";
//document.body.removeChild(popupBox);
if (config.use_dimmer) {
dimmer.style.display = "none";
//document.body.removeChild(dimmer);
}
}
};
applyConfig = function (newConfig) {
var key;
if (!newConfig || typeof newConfig !== 'object') {
return;
}
for (key in config) {
if (!config.hasOwnProperty(key)){
continue;
}
if (newConfig.hasOwnProperty(key)) {
config[key] = newConfig[key];
}
}
};
/* Initialisation stuff *
* -------------------- */
createPopup = function () {
var s;
popupBox = document.createElement("div");
popupBox.className = "quickslide-popup-box";
s = popupBox.style;
s.position = config.absolute_position ? "absolute" : "fixed";
s.zIndex = "9999";
s.display = "none";
addListener(popupBox, "click", function () {
hidePopup();
});
document.body.appendChild(popupBox);
if (config.use_dimmer) {
dimmer = document.createElement("div");
dimmer.className = "quickslide-dimmer";
s = dimmer.style;
s.position = "fixed";
s.zIndex = "9998"; // Note: one less than popupBox's zIndex
s.top = "0";
s.right = "0";
s.bottom = "0";
s.left = "0";
s.display = "none";
addListener(dimmer, "click", function () {
hidePopup();
});
addListener(document.body, "keydown", function (e) {
// Hide popup is [esc] is pressed.
if (e.keyCode === 27) {
hidePopup();
}
});
document.body.appendChild(dimmer);
}
if (config.show_caption) {
popupCaption = document.createElement("div");
popupCaption.className = "quickslide-caption";
popupBox.appendChild(popupCaption);
}
setupGalleryLinks();
};
return function (userConfig) {
applyConfig(userConfig);
if (config.no_wait && document.body) {
createPopup();
} else {
addListener(window, "load", function () {
createPopup();
});
}
};
}));