DD_belatedPNG_0.0.8

/** * DD_belatedPNG: Adds IE6 support: PNG images for CSS background-image and HTML <IMG/>. * Author: Drew Diller * Email: drew.diller@gmail.com * URL: http://www.dillerdesign.com/experiment/DD_belatedPNG/ * Version: 0.0.8a * Licensed under the MIT License: http://dillerdesign.com/experiment/DD_belatedPNG/#license * * Example usage: * DD_belatedPNG.fix('.png_bg'); // argument is a CSS selector * DD_belatedPNG.fixPng( someNode ); // argument is an HTMLDomElement **/ /* PLEASE READ: 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! */ var DD_belatedPNG = { ns: 'DD_belatedPNG', imgSize: {}, delay: 10, nodesFixed: 0, createVmlNameSpace: function () { /* enable VML */ if (document.namespaces && !document.namespaces[this.ns]) { document.namespaces.add(this.ns, 'urn:schemas-microsoft-com:vml'); } }, createVmlStyleSheet: function () { /* style VML, enable behaviors */ /* Just in case lots of other developers have added lots of other stylesheets using document.createStyleSheet and hit the 31-limit mark, let's not use that method! further reading: http://msdn.microsoft.com/en-us/library/ms531194(VS.85).aspx */ var screenStyleSheet, printStyleSheet; screenStyleSheet = document.createElement('style'); screenStyleSheet.setAttribute('media', 'screen'); document.documentElement.firstChild.insertBefore(screenStyleSheet, document.documentElement.firstChild.firstChild); if (screenStyleSheet.styleSheet) { screenStyleSheet = screenStyleSheet.styleSheet; screenStyleSheet.addRule(this.ns + '\\:*', '{behavior:url(#default#VML)}'); screenStyleSheet.addRule(this.ns + '\\:shape', 'position:absolute;'); 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/ */ this.screenStyleSheet = screenStyleSheet; /* Add a print-media stylesheet, for preventing VML artifacts from showing up in print (including preview). */ /* Thanks to R�mi Pr�vost for automating this! */ printStyleSheet = document.createElement('style'); printStyleSheet.setAttribute('media', 'print'); document.documentElement.firstChild.insertBefore(printStyleSheet, document.documentElement.firstChild.firstChild); printStyleSheet = printStyleSheet.styleSheet; printStyleSheet.addRule(this.ns + '\\:*', '{display: none !important;}'); printStyleSheet.addRule('img.' + this.ns + '_sizeFinder', '{display: none !important;}'); } }, readPropertyChange: function () { var el, display, v; el = event.srcElement; if (!el.vmlInitiated) { return; } if (event.propertyName.search('background') != -1 || event.propertyName.search('border') != -1) { DD_belatedPNG.applyVML(el); } if (event.propertyName == 'style.display') { display = (el.currentStyle.display == 'none') ? 'none' : 'block'; for (v in el.vml) { if (el.vml.hasOwnProperty(v)) { el.vml[v].shape.style.display = display; } } } if (event.propertyName.search('filter') != -1) { DD_belatedPNG.vmlOpacity(el); } }, vmlOpacity: function (el) { if (el.currentStyle.filter.search('lpha') != -1) { var trans = el.currentStyle.filter; trans = parseInt(trans.substring(trans.lastIndexOf('=')+1, trans.lastIndexOf(')')), 10)/100; el.vml.color.shape.style.filter = el.currentStyle.filter; /* complete guesswork */ el.vml.image.fill.opacity = trans; /* complete guesswork */ } }, handlePseudoHover: function (el) { setTimeout(function () { /* wouldn't work as intended without setTimeout */ DD_belatedPNG.applyVML(el); }, 1); }, /** * This is the method to use in a document. * @param {String} selector - REQUIRED - a CSS selector, such as '#doc .container' **/ fix: function (selector) { if (this.screenStyleSheet) { var selectors, i; selectors = selector.split(','); /* multiple selectors supported, no need for multiple calls to this anymore */ for (i=0; i<selectors.length; i++) { this.screenStyleSheet.addRule(selectors[i], 'behavior:expression(DD_belatedPNG.fixPng(this))'); /* seems to execute the function without adding it to the stylesheet - interesting... */ } } }, applyVML: function (el) { el.runtimeStyle.cssText = ''; this.vmlFill(el); this.vmlOffsets(el); this.vmlOpacity(el); if (el.isImg) { this.copyImageBorders(el); } }, attachHandlers: function (el) { var self, handlers, handler, moreForAs, a, h; self = this; handlers = {resize: 'vmlOffsets', move: 'vmlOffsets'}; if (el.nodeName == 'A') { moreForAs = {mouseleave: 'handlePseudoHover', mouseenter: 'handlePseudoHover', focus: 'handlePseudoHover', blur: 'handlePseudoHover'}; for (a in moreForAs) { if (moreForAs.hasOwnProperty(a)) { handlers[a] = moreForAs[a]; } } } for (h in handlers) { if (handlers.hasOwnProperty(h)) { handler = function () { self[handlers[h]](el); }; el.attachEvent('on' + h, handler); } } el.attachEvent('onpropertychange', this.readPropertyChange); }, giveLayout: function (el) { el.style.zoom = 1; if (el.currentStyle.position == 'static') { el.style.position = 'relative'; } }, copyImageBorders: function (el) { var styles, s; styles = {'borderStyle':true, 'borderWidth':true, 'borderColor':true}; for (s in styles) { if (styles.hasOwnProperty(s)) { el.vml.color.shape.style[s] = el.currentStyle[s]; } } }, vmlFill: function (el) { if (!el.currentStyle) { return; } else { var elStyle, noImg, lib, v, img, imgLoaded; elStyle = el.currentStyle; } for (v in el.vml) { if (el.vml.hasOwnProperty(v)) { el.vml[v].shape.style.zIndex = elStyle.zIndex; } } el.runtimeStyle.backgroundColor = ''; el.runtimeStyle.backgroundImage = ''; noImg = true; if (elStyle.backgroundImage != 'none' || el.isImg) { if (!el.isImg) { el.vmlBg = elStyle.backgroundImage; el.vmlBg = el.vmlBg.substr(5, el.vmlBg.lastIndexOf('")')-5); } else { el.vmlBg = el.src; } lib = this; if (!lib.imgSize[el.vmlBg]) { /* determine size of loaded image */ img = document.createElement('img'); lib.imgSize[el.vmlBg] = img; img.className = lib.ns + '_sizeFinder'; 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! */ imgLoaded = function () { this.width = this.offsetWidth; /* weird cache-busting requirement! */ this.height = this.offsetHeight; lib.vmlOffsets(el); }; img.attachEvent('onload', imgLoaded); img.src = el.vmlBg; img.removeAttribute('width'); img.removeAttribute('height'); document.body.insertBefore(img, document.body.firstChild); } el.vml.image.fill.src = el.vmlBg; noImg = false; } el.vml.image.fill.on = !noImg; el.vml.image.fill.color = 'none'; el.vml.color.shape.style.backgroundColor = elStyle.backgroundColor; el.runtimeStyle.backgroundImage = 'none'; el.runtimeStyle.backgroundColor = 'transparent'; }, /* 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 */ vmlOffsets: function (el) { var thisStyle, size, fudge, makeVisible, bg, bgR, dC, altC, b, c, v; thisStyle = el.currentStyle; size = {'W':el.clientWidth+1, 'H':el.clientHeight+1, 'w':this.imgSize[el.vmlBg].width, 'h':this.imgSize[el.vmlBg].height, 'L':el.