// -------------------------------------------------------------------
// Image Thumbnail Viewer Script- By Dynamic Drive, available at: http://www.dynamicdrive.com
// Last updated: July 7th, 2008- Fixed enlarged image not showing in IE sometimes
// -------------------------------------------------------------------
var thumbnailviewer = {
enableTitle: true, //Should "title" attribute of link be used as description?
enableAnimation: true, //Enable fading animation?
definefooter: '', //Define HTML for footer interface
defineLoading: '
Loading Image...', //Define HTML for "loading" div
/////////////No need to edit beyond here/////////////////////////
scrollbarwidth: 16,
opacitystring: 'filter:progid:DXImageTransform.Microsoft.alpha(opacity=10); -moz-opacity: 0.1; opacity: 0.1',
targetlinks: [], //Array to hold links with rel="thumbnail"
createthumbBox: function () {
//write out HTML for Image Thumbnail Viewer plus loading div
document.write('' + this.definefooter + '
' + this.defineLoading + '
');
this.thumbBox = document.getElementById("thumbBox");
this.thumbImage = document.getElementById("thumbImage"); //Reference div that holds the shown image
this.thumbLoading = document.getElementById("thumbLoading"); //Reference "loading" div that will be shown while image is fetched
this.standardbody = (document.compatMode === "CSS1Compat")? document.documentElement : document.body; //create reference to common "body" across doctypes
},
centerDiv: function (divobj) { //Centers a div element on the page
var ie = document.all && !window.opera;
var dom = document.getElementById;
var scroll_top = (ie)? this.standardbody.scrollTop : window.pageYOffset;
var scroll_left = (ie)? this.standardbody.scrollLeft : window.pageXOffset;
var docwidth = (ie)? this.standardbody.clientWidth : window.innerWidth - this.scrollbarwidth;
var docheight = (ie)? this.standardbody.clientHeight: window.innerHeight;
var docheightcomplete = (this.standardbody.offsetHeight > this.standardbody.scrollHeight)? this.standardbody.offsetHeight : this.standardbody.scrollHeight; //Full scroll height of document
var objwidth = divobj.offsetWidth; //width of div element
var objheight = divobj.offsetHeight; //height of div element
var topposition = (docheight > objheight)? scroll_top + docheight / 2 - objheight / 2 + "px" : scroll_top + 10 + "px"; //Vertical position of div element: Either centered, or if element height larger than viewpoint height, 10px from top of viewpoint
divobj.style.left = docwidth / 2 - objwidth / 2 + "px"; //Center div element horizontally
divobj.style.top = Math.floor(parseInt(topposition)) + "px";
divobj.style.visibility = "visible";
},
showthumbBox: function () { //Show ThumbBox div
thumbnailviewer.thumbLoading.style.visibility = "hidden"; //Hide "loading" div
this.centerDiv(this.thumbBox);
if (this.enableAnimation) { //If fading animation enabled
this.currentopacity = 0.1; //Starting opacity value;
this.opacitytimer = setInterval("thumbnailviewer.opacityanimation()", 20);
}
},
loadimage: function (link) { //Load image function that gets attached to each link on the page with rel="thumbnail"
if (this.thumbBox.style.visibility === "visible") { //if thumbox is visible on the page already
this.closeit(); //Hide it first (not doing so causes triggers some positioning bug in Firefox
}
var imageHTML = '
'; //Construct HTML for shown image
if (this.enableTitle && link.getAttribute("title")) { //Use title attr of the link as description?
imageHTML += '
' + link.getAttribute("title");
}
this.centerDiv(this.thumbLoading); //Center and display "loading" div while we set up the image to be shown
this.thumbImage.innerHTML = imageHTML; //Populate thumbImage div with shown image's HTML (while still hidden)
this.featureImage = this.thumbImage.getElementsByTagName("img")[0]; //Reference shown image itself
if (this.featureImage.complete) {
thumbnailviewer.showthumbBox();
} else {
this.featureImage.onload = function () { //When target image has completely loaded
thumbnailviewer.showthumbBox(); //Display "thumbbox" div to the world!
};
}
if (document.all && !window.createPopup) { //Target IE5.0 browsers only. Address IE image cache not firing onload bug: panoramio.com/blog/onload-event/
this.featureImage.src = link.getAttribute("href");
}
this.featureImage.onerror = function () { //If an error has occurred while loading the image to show
thumbnailviewer.thumbLoading.style.visibility = "hidden"; //Hide "loading" div, game over
};
},
setimgopacity: function (value) { //Sets the opacity of "thumbimage" div per the passed in value setting (0 to 1 and in between)
var targetobject = this.featureImage;
if (targetobject.filters && targetobject.filters[0]) { //IE syntax
if (typeof targetobject.filters[0].opacity === "number") { //IE6
targetobject.filters[0].opacity = value * 100;
} else { //IE 5.5
targetobject.style.filter = "alpha(opacity=" + value * 100 + ")";
}
} else if (typeof targetobject.style.MozOpacity !== "undefined") { //Old Mozilla syntax
targetobject.style.MozOpacity = value;
} else if (typeof targetobject.style.opacity !== "undefined") { //Standard opacity syntax
targetobject.style.opacity = value;
} else { //Non of the above, stop opacity animation
this.stopanimation();
}
},
opacityanimation: function () { //Gradually increase opacity function
this.setimgopacity(this.currentopacity);
this.currentopacity += 0.1;
if (this.currentopacity > 1) {
this.stopanimation();
}
},
stopanimation: function () {
if (typeof this.opacitytimer !== "undefined") {
clearInterval(this.opacitytimer);
}
},
closeit: function () { //Close "thumbbox" div function
this.stopanimation();
this.thumbBox.style.visibility = "hidden";
this.thumbImage.innerHTML = "";
this.thumbBox.style.left = "-2000px";
this.thumbBox.style.top = "-2000px";
},
cleanup: function () { //Clean up routine on page unload
this.thumbLoading = null;
if (this.featureImage) {
this.featureImage.onload = null;
}
this.featureImage = null;
this.thumbImage = null;
for (var i = 0; i < this.targetlinks.length; i++) {
this.targetlinks[i].onclick = null;
}
this.thumbBox = null;
},
dotask: function (target, functionref, tasktype) { //assign a function to execute to an event handler (ie: onunload)
tasktype = (window.addEventListener)? tasktype : "on" + tasktype;
if (target.addEventListener) {
target.addEventListener(tasktype, functionref, false);
} else if (target.attachEvent) {
target.attachEvent(tasktype, functionref);
}
},
init: function () { //Initialize thumbnail viewer script by scanning page and attaching appropriate function to links with rel="thumbnail"
if (!this.enableAnimation) {
this.opacitystring = "";
}
var pagelinks = document.getElementsByTagName("a");
for (var i = 0; i < pagelinks.length; i++) {
if (pagelinks[i].getAttribute("rel") && pagelinks[i].getAttribute("rel") === "thumbnail") {
pagelinks[i].onclick = function () {
thumbnailviewer.stopanimation(); //Stop any currently running fade animation on "thumbbox" div before proceeding
thumbnailviewer.loadimage(this); //Load image
return false;
};
this.targetlinks[this.targetlinks.length] = pagelinks[i]; //store reference to target link
}
}
//Reposition "thumbbox" div when page is resized
this.dotask(window, function () {
if (thumbnailviewer.thumbBox.style.visibility === "visible")
{
thumbnailviewer.centerDiv(thumbnailviewer.thumbBox);
}
}, "resize");
}
};
thumbnailviewer.createthumbBox(); //Output HTML for the image thumbnail viewer
thumbnailviewer.dotask(window, function () {
thumbnailviewer.init();
}, "load"); //Initialize script on page load
thumbnailviewer.dotask(window, function () {
thumbnailviewer.cleanup();
}, "unload");