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+/**
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+* DD_belatedPNG: Adds IE6 support: PNG images for CSS background-image and HTML <IMG/>.
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+* Author: Drew Diller
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+* Email: drew.diller@gmail.com
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+* URL: http://www.dillerdesign.com/experiment/DD_belatedPNG/
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+* Version: 0.0.8a
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+* Licensed under the MIT License: http://dillerdesign.com/experiment/DD_belatedPNG/#license
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+*
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+* Example usage:
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+* DD_belatedPNG.fix('.png_bg'); // argument is a CSS selector
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+* DD_belatedPNG.fixPng( someNode ); // argument is an HTMLDomElement
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+**/
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+
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+/*
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+PLEASE READ:
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+Absolutely everything in this script is SILLY. I know this. IE's rendering of certain pixels doesn't make sense, so neither does this code!
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+*/
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+
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+var DD_belatedPNG = {
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+ ns: 'DD_belatedPNG',
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+ imgSize: {},
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+ delay: 10,
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+ nodesFixed: 0,
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+ createVmlNameSpace: function () { /* enable VML */
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+ if (document.namespaces && !document.namespaces[this.ns]) {
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+ document.namespaces.add(this.ns, 'urn:schemas-microsoft-com:vml');
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+ }
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+ },
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+ createVmlStyleSheet: function () { /* style VML, enable behaviors */
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+ /*
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+ Just in case lots of other developers have added
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+ lots of other stylesheets using document.createStyleSheet
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+ and hit the 31-limit mark, let's not use that method!
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+ further reading: http://msdn.microsoft.com/en-us/library/ms531194(VS.85).aspx
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+ */
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+ var screenStyleSheet, printStyleSheet;
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+ screenStyleSheet = document.createElement('style');
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+ screenStyleSheet.setAttribute('media', 'screen');
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+ document.documentElement.firstChild.insertBefore(screenStyleSheet, document.documentElement.firstChild.firstChild);
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+ if (screenStyleSheet.styleSheet) {
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+ screenStyleSheet = screenStyleSheet.styleSheet;
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+ screenStyleSheet.addRule(this.ns + '\\:*', '{behavior:url(#default#VML)}');
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+ screenStyleSheet.addRule(this.ns + '\\:shape', 'position:absolute;');
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+ screenStyleSheet.addRule('img.' + this.ns + '_sizeFinder', 'behavior:none; border:none; position:absolute; z-index:-1; top:-10000px; visibility:hidden;'); /* large negative top value for avoiding vertical scrollbars for large images, suggested by James O'Brien, http://www.thanatopsic.org/hendrik/ */
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+ this.screenStyleSheet = screenStyleSheet;
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+
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+ /* Add a print-media stylesheet, for preventing VML artifacts from showing up in print (including preview). */
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+ /* Thanks to Rémi Prévost for automating this! */
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+ printStyleSheet = document.createElement('style');
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+ printStyleSheet.setAttribute('media', 'print');
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+ document.documentElement.firstChild.insertBefore(printStyleSheet, document.documentElement.firstChild.firstChild);
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+ printStyleSheet = printStyleSheet.styleSheet;
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+ printStyleSheet.addRule(this.ns + '\\:*', '{display: none !important;}');
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+ printStyleSheet.addRule('img.' + this.ns + '_sizeFinder', '{display: none !important;}');
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+ }
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+ },
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+ readPropertyChange: function () {
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+ var el, display, v;
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+ el = event.srcElement;
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+ if (!el.vmlInitiated) {
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+ return;
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+ }
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+ if (event.propertyName.search('background') != -1 || event.propertyName.search('border') != -1) {
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+ DD_belatedPNG.applyVML(el);
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+ }
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+ if (event.propertyName == 'style.display') {
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+ display = (el.currentStyle.display == 'none') ? 'none' : 'block';
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+ for (v in el.vml) {
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+ if (el.vml.hasOwnProperty(v)) {
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+ el.vml[v].shape.style.display = display;
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+ }
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+ }
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+ }
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+ if (event.propertyName.search('filter') != -1) {
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+ DD_belatedPNG.vmlOpacity(el);
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+ }
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+ },
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+ vmlOpacity: function (el) {
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+ if (el.currentStyle.filter.search('lpha') != -1) {
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+ var trans = el.currentStyle.filter;
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+ trans = parseInt(trans.substring(trans.lastIndexOf('=')+1, trans.lastIndexOf(')')), 10)/100;
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+ el.vml.color.shape.style.filter = el.currentStyle.filter; /* complete guesswork */
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+ el.vml.image.fill.opacity = trans; /* complete guesswork */
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+ }
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+ },
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+ handlePseudoHover: function (el) {
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+ setTimeout(function () { /* wouldn't work as intended without setTimeout */
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+ DD_belatedPNG.applyVML(el);
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+ }, 1);
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+ },
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+ /**
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+ * This is the method to use in a document.
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+ * @param {String} selector - REQUIRED - a CSS selector, such as '#doc .container'
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+ **/
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+ fix: function (selector) {
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+ if (this.screenStyleSheet) {
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+ var selectors, i;
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+ selectors = selector.split(','); /* multiple selectors supported, no need for multiple calls to this anymore */
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+ for (i=0; i<selectors.length; i++) {
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+ this.screenStyleSheet.addRule(selectors[i], 'behavior:expression(DD_belatedPNG.fixPng(this))'); /* seems to execute the function without adding it to the stylesheet - interesting... */
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+ }
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+ }
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+ },
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+ applyVML: function (el) {
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+ el.runtimeStyle.cssText = '';
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+ this.vmlFill(el);
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+ this.vmlOffsets(el);
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+ this.vmlOpacity(el);
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+ if (el.isImg) {
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+ this.copyImageBorders(el);
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+ }
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+ },
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+ attachHandlers: function (el) {
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+ var self, handlers, handler, moreForAs, a, h;
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+ self = this;
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+ handlers = {resize: 'vmlOffsets', move: 'vmlOffsets'};
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+ if (el.nodeName == 'A') {
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+ moreForAs = {mouseleave: 'handlePseudoHover', mouseenter: 'handlePseudoHover', focus: 'handlePseudoHover', blur: 'handlePseudoHover'};
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+ for (a in moreForAs) {
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+ if (moreForAs.hasOwnProperty(a)) {
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+ handlers[a] = moreForAs[a];
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+ }
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+ }
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+ }
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+ for (h in handlers) {
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+ if (handlers.hasOwnProperty(h)) {
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+ handler = function () {
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+ self[handlers[h]](el);
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+ };
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+ el.attachEvent('on' + h, handler);
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+ }
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+ }
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+ el.attachEvent('onpropertychange', this.readPropertyChange);
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+ },
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+ giveLayout: function (el) {
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+ el.style.zoom = 1;
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+ if (el.currentStyle.position == 'static') {
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+ el.style.position = 'relative';
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+ }
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+ },
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+ copyImageBorders: function (el) {
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+ var styles, s;
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+ styles = {'borderStyle':true, 'borderWidth':true, 'borderColor':true};
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+ for (s in styles) {
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+ if (styles.hasOwnProperty(s)) {
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+ el.vml.color.shape.style[s] = el.currentStyle[s];
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+ }
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+ }
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+ },
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+ vmlFill: function (el) {
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+ if (!el.currentStyle) {
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+ return;
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+ } else {
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+ var elStyle, noImg, lib, v, img, imgLoaded;
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+ elStyle = el.currentStyle;
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+ }
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+ for (v in el.vml) {
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+ if (el.vml.hasOwnProperty(v)) {
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+ el.vml[v].shape.style.zIndex = elStyle.zIndex;
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+ }
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+ }
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+ el.runtimeStyle.backgroundColor = '';
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+ el.runtimeStyle.backgroundImage = '';
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+ noImg = true;
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+ if (elStyle.backgroundImage != 'none' || el.isImg) {
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+ if (!el.isImg) {
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+ el.vmlBg = elStyle.backgroundImage;
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+ el.vmlBg = el.vmlBg.substr(5, el.vmlBg.lastIndexOf('")')-5);
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+ }
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+ else {
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+ el.vmlBg = el.src;
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+ }
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+ lib = this;
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+ if (!lib.imgSize[el.vmlBg]) { /* determine size of loaded image */
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+ img = document.createElement('img');
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+ lib.imgSize[el.vmlBg] = img;
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+ img.className = lib.ns + '_sizeFinder';
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+ img.runtimeStyle.cssText = 'behavior:none; position:absolute; left:-10000px; top:-10000px; border:none; margin:0; padding:0;'; /* make sure to set behavior to none to prevent accidental matching of the helper elements! */
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+ imgLoaded = function () {
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+ this.width = this.offsetWidth; /* weird cache-busting requirement! */
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+ this.height = this.offsetHeight;
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+ lib.vmlOffsets(el);
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+ };
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+ img.attachEvent('onload', imgLoaded);
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+ img.src = el.vmlBg;
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+ img.removeAttribute('width');
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+ img.removeAttribute('height');
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+ document.body.insertBefore(img, document.body.firstChild);
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+ }
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+ el.vml.image.fill.src = el.vmlBg;
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+ noImg = false;
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+ }
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+ el.vml.image.fill.on = !noImg;
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+ el.vml.image.fill.color = 'none';
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+ el.vml.color.shape.style.backgroundColor = elStyle.backgroundColor;
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+ el.runtimeStyle.backgroundImage = 'none';
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+ el.runtimeStyle.backgroundColor = 'transparent';
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+ },
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+ /* IE can't figure out what do when the offsetLeft and the clientLeft add up to 1, and the VML ends up getting fuzzy... so we have to push/enlarge things by 1 pixel and then clip off the excess */
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+ vmlOffsets: function (el) {
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+ var thisStyle, size, fudge, makeVisible, bg, bgR, dC, altC, b, c, v;
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+ thisStyle = el.currentStyle;
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+ size = {'W':el.clientWidth+1, 'H':el.clientHeight+1, 'w':this.imgSize[el.vmlBg].width, 'h':this.imgSize[el.vmlBg].height, 'L':el.offsetLeft, 'T':el.offsetTop, 'bLW':el.clientLeft, 'bTW':el.clientTop};
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+ fudge = (size.L + size.bLW == 1) ? 1 : 0;
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+ /* vml shape, left, top, width, height, origin */
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+ makeVisible = function (vml, l, t, w, h, o) {
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+ vml.coordsize = w+','+h;
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+ vml.coordorigin = o+','+o;
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+ vml.path = 'm0,0l'+w+',0l'+w+','+h+'l0,'+h+' xe';
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+ vml.style.width = w + 'px';
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+ vml.style.height = h + 'px';
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+ vml.style.left = l + 'px';
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+ vml.style.top = t + 'px';
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+ };
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+ makeVisible(el.vml.color.shape, (size.L + (el.isImg ? 0 : size.bLW)), (size.T + (el.isImg ? 0 : size.bTW)), (size.W-1), (size.H-1), 0);
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+ makeVisible(el.vml.image.shape, (size.L + size.bLW), (size.T + size.bTW), (size.W), (size.H), 1 );
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+ bg = {'X':0, 'Y':0};
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+ if (el.isImg) {
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+ bg.X = parseInt(thisStyle.paddingLeft, 10) + 1;
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+ bg.Y = parseInt(thisStyle.paddingTop, 10) + 1;
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+ }
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+ else {
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+ for (b in bg) {
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+ if (bg.hasOwnProperty(b)) {
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+ this.figurePercentage(bg, size, b, thisStyle['backgroundPosition'+b]);
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+ }
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+ }
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+ }
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+ el.vml.image.fill.position = (bg.X/size.W) + ',' + (bg.Y/size.H);
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+ bgR = thisStyle.backgroundRepeat;
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+ dC = {'T':1, 'R':size.W+fudge, 'B':size.H, 'L':1+fudge}; /* these are defaults for repeat of any kind */
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+ altC = { 'X': {'b1': 'L', 'b2': 'R', 'd': 'W'}, 'Y': {'b1': 'T', 'b2': 'B', 'd': 'H'} };
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+ if (bgR != 'repeat' || el.isImg) {
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+ c = {'T':(bg.Y), 'R':(bg.X+size.w), 'B':(bg.Y+size.h), 'L':(bg.X)}; /* these are defaults for no-repeat - clips down to the image location */
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+ if (bgR.search('repeat-') != -1) { /* now let's revert to dC for repeat-x or repeat-y */
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+ v = bgR.split('repeat-')[1].toUpperCase();
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+ c[altC[v].b1] = 1;
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+ c[altC[v].b2] = size[altC[v].d];
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+ }
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+ if (c.B > size.H) {
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+ c.B = size.H;
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+ }
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+ el.vml.image.shape.style.clip = 'rect('+c.T+'px '+(c.R+fudge)+'px '+c.B+'px '+(c.L+fudge)+'px)';
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+ }
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+ else {
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+ el.vml.image.shape.style.clip = 'rect('+dC.T+'px '+dC.R+'px '+dC.B+'px '+dC.L+'px)';
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+ }
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+ },
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+ figurePercentage: function (bg, size, axis, position) {
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+ var horizontal, fraction;
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+ fraction = true;
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+ horizontal = (axis == 'X');
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+ switch(position) {
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+ case 'left':
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+ case 'top':
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+ bg[axis] = 0;
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+ break;
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+ case 'center':
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+ bg[axis] = 0.5;
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+ break;
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+ case 'right':
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+ case 'bottom':
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+ bg[axis] = 1;
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+ break;
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+ default:
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+ if (position.search('%') != -1) {
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+ bg[axis] = parseInt(position, 10) / 100;
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+ }
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+ else {
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+ fraction = false;
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+ }
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+ }
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+ bg[axis] = Math.ceil( fraction ? ( (size[horizontal?'W': 'H'] * bg[axis]) - (size[horizontal?'w': 'h'] * bg[axis]) ) : parseInt(position, 10) );
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+ if (bg[axis] % 2 === 0) {
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+ bg[axis]++;
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+ }
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+ return bg[axis];
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+ },
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+ fixPng: function (el) {
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+ el.style.behavior = 'none';
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+ var lib, els, nodeStr, v, e;
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+ if (el.nodeName == 'BODY' || el.nodeName == 'TD' || el.nodeName == 'TR') { /* elements not supported yet */
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+ return;
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+ }
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+ el.isImg = false;
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+ if (el.nodeName == 'IMG') {
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+ if(el.src.toLowerCase().search(/\.png$/) != -1) {
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+ el.isImg = true;
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+ el.style.visibility = 'hidden';
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+ }
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+ else {
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+ return;
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+ }
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+ }
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+ else if (el.currentStyle.backgroundImage.toLowerCase().search('.png') == -1) {
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+ return;
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+ }
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+ lib = DD_belatedPNG;
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+ el.vml = {color: {}, image: {}};
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+ els = {shape: {}, fill: {}};
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+ for (v in el.vml) {
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+ if (el.vml.hasOwnProperty(v)) {
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+ for (e in els) {
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+ if (els.hasOwnProperty(e)) {
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+ nodeStr = lib.ns + ':' + e;
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+ el.vml[v][e] = document.createElement(nodeStr);
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+ }
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+ }
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+ el.vml[v].shape.stroked = false;
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+ el.vml[v].shape.appendChild(el.vml[v].fill);
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+ el.parentNode.insertBefore(el.vml[v].shape, el);
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+ }
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+ }
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+ el.vml.image.shape.fillcolor = 'none'; /* Don't show blank white shapeangle when waiting for image to load. */
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+ el.vml.image.fill.type = 'tile'; /* Makes image show up. */
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+ el.vml.color.fill.on = false; /* Actually going to apply vml element's style.backgroundColor, so hide the whiteness. */
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+ lib.attachHandlers(el);
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+ lib.giveLayout(el);
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+ lib.giveLayout(el.offsetParent);
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+ el.vmlInitiated = true;
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+ lib.applyVML(el); /* Render! */
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+ }
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+};
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+try {
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+ document.execCommand("BackgroundImageCache", false, true); /* TredoSoft Multiple IE doesn't like this, so try{} it */
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+} catch(r) {}
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+DD_belatedPNG.createVmlNameSpace();
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+DD_belatedPNG.createVmlStyleSheet();
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