/*
* MojoZoom 0.1.6 - JavaScript Image Zoom
* Licensed under the MPL License [http://www.nihilogic.dk/licenses/mpl-license.txt]
*/
var MojoZoom = (function() {
var $ = function(id) {return document.getElementById(id);};
var dc = function(tag) {return document.createElement(tag);};
var defaultWidth = 256;
var defaultHeight = 256;
function addEvent(element, ev, handler)
{
var doHandler = function(e) {
return handler(e||window.event);
}
if (element.addEventListener) {
element.addEventListener(ev, doHandler, false);
} else if (element.attachEvent) {
element.attachEvent("on" + ev, doHandler);
}
}
function getElementPos(element)
{
var x = element.offsetLeft;
var y = element.offsetTop;
var parent = element.offsetParent;
while (parent) {
x += parent.offsetLeft - parent.scrollLeft;
y += parent.offsetTop - parent.scrollTop;
parent = parent.offsetParent;
}
return {
x : x,
y : y
}
}
function getEventMousePos(element, e) {
var scrollX = document.body.scrollLeft || document.documentElement.scrollLeft;
var scrollY = document.body.scrollTop || document.documentElement.scrollTop;
if (e.currentTarget) {
var pos = getElementPos(element);
return {
x : e.clientX - pos.x + scrollX,
y : e.clientY - pos.y + scrollY
}
}
return {
x : e.offsetX,
y : e.offsetY
}
}
function makeZoomable(img, zoomSrc, zoomImgCtr, zoomWidth, zoomHeight, alwaysShow) {
// make sure the image is loaded, if not then add an onload event and return
if (!img.complete && !img.__mojoZoomQueued) {
addEvent(img, "load", function() {
img.__mojoZoomQueued = true;
setTimeout(function() {
makeZoomable(img, zoomSrc, zoomImgCtr, zoomWidth, zoomHeight, alwaysShow);
}, 1);
});
return;
}
img.__mojoZoomQueued = false;
// Wrap everything in a timeout.
// this fixes a problem where, if makeZoomable is called a second time after changing the src,
// FF would not have figured out the new offsetHeight of the image yet. A small timeout helps though it's rather hackish.
setTimeout(function(){
// sorry
var isIE = !!document.all && !!window.attachEvent && !window.opera;
var w = img.offsetWidth;
var h = img.offsetHeight;
var oldParent = img.parentNode;
if (oldParent.nodeName != "A") {
var linkParent = dc("a");
linkParent.setAttribute("href", zoomSrc);
oldParent.replaceChild(linkParent, img);
linkParent.appendChild(img);
} else {
var linkParent = oldParent;
}
linkParent.style.position = "relative";
linkParent.style.display = "block";
linkParent.style.width = w+"px";
linkParent.style.height = h+"px";
var imgLeft = img.offsetLeft;
var imgTop = img.offsetTop;
var zoom = dc("div");
zoom.className = "mojozoom_marker";
var zoomImg = dc("img");
zoomImg.className = "mojozoom_img";
zoomImg.style.position = "absolute";
zoomImg.style.left = "-9999px";
zoomImg.style.top = "-9999px";
zoomImg.style.maxWidth = "none";
zoomImg.style.maxHeight = "none";
zoomImg.style.zIndex = 10000001;
document.body.appendChild(zoomImg);
var parent = img.parentNode;
var ctr = dc("div");
ctr.style.position = "absolute";
ctr.style.left = imgLeft+"px";
ctr.style.top = imgTop+"px";
ctr.style.width = w+"px";
ctr.style.height = h+"px";
ctr.style.overflow = "hidden";
ctr.style.display = "none";
ctr.appendChild(zoom);
parent.appendChild(ctr);
var zoomInput = parent;
// clear old overlay
if (img.__mojoZoomOverlay)
parent.removeChild(img.__mojoZoomOverlay);
img.__mojoZoomOverlay = ctr;
// clear old high-res image
if (img.__mojoZoomImage && img.__mojoZoomImage.parentNode)
img.__mojoZoomImage.parentNode.removeChild(img.__mojoZoomImage);
img.__mojoZoomImage = zoomImg;
var useDefaultCtr = false;
if (!zoomImgCtr) {
zoomImgCtr = dc("div");
zoomImgCtr.className = "mojozoom_imgctr";
var imgPos = getElementPos(img);
zoomImgCtr.style.left = w + imgPos.x + "px";
zoomImgCtr.style.top = imgPos.y + "px";
zoomImgCtr.style.width = (zoomWidth ? zoomWidth : defaultWidth) +"px";
zoomImgCtr.style.height = (zoomHeight ? zoomHeight : defaultHeight) +"px";
document.body.appendChild(zoomImgCtr);
useDefaultCtr = true;
}
zoomImgCtr.style.overflow = "hidden";
if (!alwaysShow) {
zoomImgCtr.style.visibility = "hidden";
}
addEvent(zoomImg, "load", function() {
// bail out if img has been removed from dom
if (!zoomImg.parentNode) return;
var zoomWidth = zoomImg.offsetWidth ? zoomImg.offsetWidth : zoomImg.naturalWidth;
var zoomHeight = zoomImg.offsetHeight ? zoomImg.offsetHeight : zoomImg.naturalHeight;
var ctrWidth = zoomImgCtr.offsetWidth;
var ctrHeight = zoomImgCtr.offsetHeight;
var ratioW = zoomWidth / w;
var ratioH = zoomHeight / h;
var markerWidth = Math.round(ctrWidth / ratioW);
var markerHeight = Math.round(ctrHeight / ratioH);
document.body.removeChild(zoomImg);
zoomImgCtr.appendChild(zoomImg);
var zoomFill = dc("div");
zoomFill.className = "mojozoom_fill";
zoom.appendChild(zoomFill);
var zoomBorder = dc("div");
zoomBorder.className = "mojozoom_border";
zoom.appendChild(zoomBorder);
zoom.style.width = markerWidth+"px";
zoom.style.height = markerHeight+"px";
if (alwaysShow) {
zoom.style.left = "0px";
zoom.style.top = "0px";
zoomImg.style.left = "0px";
zoomImg.style.top = "0px";
}
var isInImage = false;
if (!alwaysShow) {
addEvent(zoomInput, "mouseout",
function(e) {
var target = e.target || e.srcElement;
if (!target) return;
if (target.nodeName != "DIV") return;
var relTarget = e.relatedTarget || e.toElement;
if (!relTarget) return;
while (relTarget != target && relTarget.nodeName != "BODY" && relTarget.parentNode) {
relTarget = relTarget.parentNode;
}
if (relTarget != target) {
isInImage = false;
ctr.style.display = "none";
zoomImgCtr.style.visibility = "hidden";
}
}
);
// a bit of a hack, mouseout is sometimes not caught if moving mouse really fast
addEvent(document.body, "mouseover",
function(e) {
if (isInImage && !(e.toElement == zoomBorder || e.target == zoomBorder)) {
ctr.style.display = "none";
zoomImgCtr.style.visibility = "hidden";
isInImage = false;
}
}
);
}
addEvent(zoomInput, "mousemove",
function(e) {
isInImage = true;
var imgPos = getElementPos(img);
if (useDefaultCtr) {
zoomImgCtr.style.left = w + imgPos.x + "px";
zoomImgCtr.style.top = imgPos.y + "px";
}
ctr.style.display = "block";
zoomImgCtr.style.visibility = "visible";
var pos = getEventMousePos(zoomInput, e);
if (e.srcElement && isIE) {
if (e.srcElement == zoom) return;
if (e.srcElement != zoomInput) {
var zoomImgPos = getElementPos(e.srcElement);
pos.x -= (imgPos.x - zoomImgPos.x);
pos.y -= (imgPos.y - zoomImgPos.y);
}
}
var x = markerWidth/2;
var y = markerHeight/2;
if (!isIE) {
pos.x -= imgLeft;
pos.y -= imgTop;
}
if (pos.x < x) pos.x = x;
if (pos.x > w-x) pos.x = w-x;
if (pos.y < y) pos.y = y;
if (pos.y > h-y) pos.y = h-y;
var left = ((pos.x - x)|0);
var top = ((pos.y - y)|0);
zoom.style.left = left + "px";
zoom.style.top = top + "px";
zoomImg.style.left = -((pos.x*ratioW - ctrWidth/2)|0)+"px";
zoomImg.style.top = -((pos.y*ratioH - ctrHeight/2)|0)+"px";
}
);
});
// I've no idea. Simply setting the src will make IE screw it self into a 100% CPU fest. In a timeout, it's ok.
setTimeout(function() {
zoomImg.src = zoomSrc;
}, 1);
}, 1);
}
function init() {
var images = document.getElementsByTagName("img");
for (var i=0;i<images.length;i++) {
var img = images[i];
var zoomSrc = img.getAttribute("data-zoomsrc");
if (zoomSrc) {
makeZoomable(img, zoomSrc, document.getElementById(img.getAttribute("id") + "_zoom"), null, null, img.getAttribute("data-zoomalwaysshow")=="true");
}
}
}
return {
addEvent : addEvent,
init : init,
makeZoomable : makeZoomable
};
})();
MojoZoom.addEvent(window, "load", MojoZoom.init);
