iepngfix.js
// IE5.5+ PNG Alpha Fix v2.0 Alpha: Background Tiling Support
// (c) 2008-2009 Angus Turnbull http://www.twinhelix.com
// This is licensed under the GNU LGPL, version 2.1 or later.
// For details, see: http://creativecommons.org/licenses/LGPL/2.1/
var IEPNGFix = window.IEPNGFix || {};
IEPNGFix.tileBG = function(elm, pngSrc, ready) {
// Params: A reference to a DOM element, the PNG src file pathname, and a
// hidden "ready-to-run" passed when called back after image preloading.
var data = this.data[elm.uniqueID],
elmW = Math.max(elm.clientWidth, elm.scrollWidth),
elmH = Math.max(elm.clientHeight, elm.scrollHeight),
bgX = elm.currentStyle.backgroundPositionX,
bgY = elm.currentStyle.backgroundPositionY,
bgR = elm.currentStyle.backgroundRepeat;
// Cache of DIVs created per element, and image preloader/data.
if (!data.tiles) {
data.tiles = {
elm: elm,
src: '',
cache: [],
img: new Image(),
old: {}
};
}
var tiles = data.tiles,
pngW = tiles.img.width,
pngH = tiles.img.height;
if (pngSrc) {
if (!ready && pngSrc != tiles.src) {
// New image? Preload it with a callback to detect dimensions.
tiles.img.onload = function() {
this.onload = null;
IEPNGFix.tileBG(elm, pngSrc, 1);
};
return tiles.img.src = pngSrc;
}
} else {
// No image?
if (tiles.src) ready = 1;
pngW = pngH = 0;
}
tiles.src = pngSrc;
if (!ready && elmW == tiles.old.w && elmH == tiles.old.h &&
bgX == tiles.old.x && bgY == tiles.old.y && bgR == tiles.old.r) {
return;
}
// Convert English and percentage positions to pixels.
var pos = {
top: '0%',
left: '0%',
center: '50%',
bottom: '100%',
right: '100%'
},
x,
y,
pc;
x = pos[bgX] || bgX;
y = pos[bgY] || bgY;
if (pc = x.match(/(\d+)%/)) {
x = Math.round((elmW - pngW) * (parseInt(pc[1]) / 100));
}
if (pc = y.match(/(\d+)%/)) {
y = Math.round((elmH - pngH) * (parseInt(pc[1]) / 100));
}
x = parseInt(x);
y = parseInt(y);
// Handle backgroundRepeat.
var repeatX = { 'repeat': 1, 'repeat-x': 1 }[bgR],
repeatY = { 'repeat': 1, 'repeat-y': 1 }[bgR];
if (repeatX) {
x %= pngW;
if (x > 0) x -= pngW;
}
if (repeatY) {
y %= pngH;
if (y > 0) y -= pngH;
}
// Go!
this.hook.enabled = 0;
if (!({ relative: 1, absolute: 1 }[elm.currentStyle.position])) {
elm.style.position = 'relative';
}
var count = 0,
xPos,
maxX = repeatX ? elmW : x + 0.1,
yPos,
maxY = repeatY ? elmH : y + 0.1,
d,
s,
isNew;
if (pngW && pngH) {
for (xPos = x; xPos < maxX; xPos += pngW) {
for (yPos = y; yPos < maxY; yPos += pngH) {
isNew = 0;
if (!tiles.cache[count]) {
tiles.cache[count] = document.createElement('div');
isNew = 1;
}
var clipR = Math.max(0, xPos + pngW > elmW ? elmW - xPos : pngW),
clipB = Math.max(0, yPos + pngH > elmH ? elmH - yPos : pngH);
d = tiles.cache[count];
s = d.style;
s.behavior = 'none';
s.left = (xPos - parseInt(elm.currentStyle.paddingLeft)) + 'px';
s.top = yPos + 'px';
s.width = clipR + 'px';
s.height = clipB + 'px';
s.clip = 'rect(' +
(yPos < 0 ? 0 - yPos : 0) + 'px,' +
clipR + 'px,' +
clipB + 'px,' +
(xPos < 0 ? 0 - xPos : 0) + 'px)';
s.display = 'block';
if (isNew) {
s.position = 'absolute';
s.zIndex = -999;
if (elm.firstChild) {
elm.insertBefore(d, elm.firstChild);
} else {
elm.appendChild(d);
}
}
this.fix(d, pngSrc, 0);
count++;
}
}
}
while (count < tiles.cache.length) {
this.fix(tiles.cache[count], '', 0);
tiles.cache[count++].style.display = 'none';
}
this.hook.enabled = 1;
// Cache so updates are infrequent.
tiles.old = {
w: elmW,
h: elmH,
x: bgX,
y: bgY,
r: bgR
};
};
IEPNGFix.update = function() {
// Update all PNG backgrounds.
for (var i in IEPNGFix.data) {
var t = IEPNGFix.data[i].tiles;
if (t && t.elm && t.src) {
IEPNGFix.tileBG(t.elm, t.src);
}
}
};
IEPNGFix.update.timer = 0;
if (window.attachEvent && !window.opera) {
window.attachEvent('onresize', function() {
clearTimeout(IEPNGFix.update.timer);
IEPNGFix.update.timer = setTimeout(IEPNGFix.update, 100);
});
}
iepngfix.htc
<public:component>
<script type="text/javascript">
// IE5.5+ PNG Alpha Fix v2.0 Alpha
// (c) 2004-2009 Angus Turnbull http://www.twinhelix.com
// This is licensed under the GNU LGPL, version 2.1 or later.
// For details, see: http://creativecommons.org/licenses/LGPL/2.1/
var IEPNGFix = window.IEPNGFix || {};
IEPNGFix.data = IEPNGFix.data || {};
// CONFIG: blankImg is the path to blank.gif, *relative to the HTML document*.
// Try either:
// * An absolute path like: '/images/blank.gif'
// * A path relative to this HTC file like: thisFolder + 'blank.gif'
var thisFolder = document.URL.replace(/(\\|\/)[^\\\/]*$/, '/');
IEPNGFix.blankImg = thisFolder + 'blank.gif';
IEPNGFix.fix = function(elm, src, t) {
// Applies an image 'src' to an element 'elm' using the DirectX filter.
// If 'src' is null, filter is disabled.
// Disables the 'hook' to prevent infinite recursion on setting BG/src.
// 't' = type, where background tile = 0, background = 1, IMG SRC = 2.
var h = this.hook.enabled;
this.hook.enabled = 0;
var f = 'DXImageTransform.Microsoft.AlphaImageLoader';
src = (src || '').replace(/\(/g, '%28').replace(/\)/g, '%29');
if (
src && !(/IMG|INPUT/.test(elm.nodeName) && (t != 2)) &&
elm.currentStyle.width == 'auto' && elm.currentStyle.height == 'auto'
) {
if (elm.offsetWidth) {
elm.style.width = elm.offsetWidth + 'px';
}
if (elm.clientHeight) {
elm.style.height = elm.clientHeight + 'px';
}
if (elm.currentStyle.display == 'inline') {
elm.style.display = 'inline-block';
}
}
if (t == 1) {
elm.style.backgroundImage = 'url("' + this.blankImg + '")';
}
if (t == 2) {
elm.src = this.blankImg;
}
if (elm.filters[f]) {
elm.filters[f].enabled = src ? true : false;
if (src) {
elm.filters[f].src = src;
}
} else if (src) {
elm.style.filter = 'progid:' + f + '(src="' + src +
'",sizingMethod="' + (t == 2 ? 'scale' : 'crop') + '")';
}
this.hook.enabled = h;
};
IEPNGFix.process = function(elm, init) {
// Checks the onpropertychange event (on first 'init' run, a fake event)
// and calls the filter-applying-functions.
if (
!/MSIE (5\.5|6)/.test(navigator.userAgent) ||
typeof elm.filters == 'unknown'
) {
return;
}
if (!this.data[elm.uniqueID]) {
this.data[elm.uniqueID] = {
className: ''
};
}
var data = this.data[elm.uniqueID],
evt = init ? { propertyName: 'src,backgroundImage' } : event,
isSrc = /src/.test(evt.propertyName),
isBg = /backgroundImage/.test(evt.propertyName),
isPos = /width|height|background(Pos|Rep)/.test(evt.propertyName),
isClass = !init && ((elm.className != data.className) &&
(elm.className || data.className));
if (!(isSrc || isBg || isPos || isClass)) {
return;
}
data.className = elm.className;
var blank = this.blankImg.match(/([^\/]+)$/)[1],
eS = elm.style,
eCS = elm.currentStyle;
// Required for Whatever:hover - erase set BG if className changes.
if (
isClass && (eS.backgroundImage.indexOf('url(') == -1 ||
eS.backgroundImage.indexOf(blank) > -1)
) {
return setTimeout(function() {
eS.backgroundImage = '';
}, 0);
}
// Foregrounds.
if (isSrc && elm.src && { IMG: 1, INPUT: 1 }[elm.nodeName]) {
if ((/\.png/i).test(elm.src)) {
if (!elm.oSrc) {
// MM rollover compat
elm.oSrc = elm.src;
}
this.fix(elm, elm.src, 2);
} else if (elm.src.indexOf(blank) == -1) {
this.fix(elm, '');
}
}
// Backgrounds.
var bgSrc = eCS.backgroundImage || eS.backgroundImage;
if ((bgSrc + elm.src).indexOf(blank) == -1) {
var bgPNG = bgSrc.match(/url[("']+(.*\.png[^\)"']*)[\)"']/i);
if (bgPNG) {
if (this.tileBG && !{ IMG: 1, INPUT: 1 }[elm.nodeName]) {
this.tileBG(elm, bgPNG[1]);
this.fix(elm, '', 1);
} else {
if (data.tiles && data.tiles.src) {
this.tileBG(elm, '');
}
this.fix(elm, bgPNG[1], 1);
this.childFix(elm);
}
} else {
if (data.tiles && data.tiles.src) {
this.tileBG(elm, '');
}
this.fix(elm, '');
}
} else if ((isPos || isClass) && data.tiles && data.tiles.src) {
this.tileBG(elm, data.tiles.src);
}
if (init) {
this.hook.enabled = 1;
elm.attachEvent('onpropertychange', this.hook);
}
};
IEPNGFix.childFix = function(elm) {
// "hasLayout" fix for unclickable children inside PNG backgrounds.
var tags = [
'a',
'input',
'select',
'textarea',
'button',
'iframe',
'object'
],
t = tags.length,
tFix = [];
while (t--) {
var pFix = elm.all.tags(tags[t]),
e = pFix.length;
while (e--) {
tFix.push(pFix[e]);
}
}
t = tFix.length;
if (t && (/relative|absolute/i).test(elm.currentStyle.position)) {
alert('IEPNGFix: Unclickable children of element:' +
'\n\n<' + elm.nodeName + (elm.id && ' id=' + elm.id) + '>');
}
while (t--) {
if (!(/relative|absolute/i).test(tFix[t].currentStyle.position)) {
tFix[t].style.position = 'relative';
}
}
};
IEPNGFix.hook = function() {
if (IEPNGFix.hook.enabled) {
IEPNGFix.process(element, 0);
}
};
IEPNGFix.process(element, 1);
</script>
</public:component>
png image
simple.html
<html>
<head>
<script type="text/javascript" src="iepngfix.js"></script>
<style type="text/css">
img, div, input { behavior: url("iepngfix.htc") }
</style>
</head>
<body>
<div style="background:url('bg.png') no-repeat;height:200px;width:200px;text-align:center;">
<a style="display:block;padding-top:100px;" href="http://www.google.com/">click</a>
</div>
</body>
</html>
maybe usage on server
in .htaccess file
AddType text/x-component .htc
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