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box-sizing-polyfill/boxsizing.htc
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Running into problems with a percentage width/height and a parent con…

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Christian Schaefer Anthony Bucci Adam Bowen
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/**
* box-sizing Polyfill
*
* A polyfill for box-sizing: border-box for IE6 & IE7.
*
* JScript
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* See <http://www.gnu.org/licenses/lgpl-3.0.txt>
*
* @category JScript
* @package box-sizing-polyfill
* @author Christian Schepp Schaefer <schaepp@gmx.de> <http://twitter.com/derSchepp>
* @copyright 2012 Christian Schepp Schaefer
* @license http://www.gnu.org/copyleft/lesser.html The GNU LESSER GENERAL PUBLIC LICENSE, Version 3.0
* @link http://github.com/Schepp/box-sizing-polyfill
*
* PREFACE:
*
* This box-sizing polyfill is based on previous work done by Erik Arvidsson,
* which he published in 2002 on http://webfx.eae.net/dhtml/boxsizing/boxsizing.html.
*
* USAGE:
*
* Add the behavior/HTC after every `box-sizing: border-box;` that you assign:
*
* box-sizing: border-box;
* *behavior: url(/scripts/boxsizing.htc);`
*
* Prefix the `behavior` property with a star, like seen above, so it will only be seen by
* IE6 & IE7, not by IE8+ who already implement box-sizing.
*
* The URL to the HTC file must be relative to your HTML(!) document, not relative to your CSS.
* That's why I'd advise you to use absolute paths like in the example.
*
*/
<component lightWeight="true">
<attach event="onpropertychange" onevent="checkPropertyChange()" />
<attach event="ondetach" onevent="restore()" />
<attach event="onresize" for="window" onevent="update()" />
<script type="text/javascript">
//<![CDATA[
var viewportwidth = (typeof window.innerWidth != 'undefined' ? window.innerWidth : element.document.documentElement.clientWidth);
// Shortcut for the document object
var doc = element.document;
// Buffer for multiple resize events
var resizetimeout = null;
// Don't apply box-sizing to certain elements
var apply = false;
switch(element.nodeName){
case '#comment':
case 'HTML':
case 'HEAD':
case 'TITLE':
case 'SCRIPT':
case 'STYLE':
case 'LINK':
case 'META':
break;
default:
apply = true;
break;
}
/*
* update gets called during resize events, then waits until there are no further resize events, and finally triggers a recalculation
*/
function update(){
if(resizetimeout !== null){
window.clearTimeout(resizetimeout);
}
resizetimeout = window.setTimeout(function(){
try{
restore();
init();
}
catch(e){}
resizetimeout = null;
},100);
}
/*
* restore gets called when the behavior is being detached (see event binding at the top),
* resets everything like it was before applying the behavior
*/
function restore(){
if(apply){
try{
element.runtimeStyle.removeAttribute("width");
element.runtimeStyle.removeAttribute("height");
}
catch(e){}
}
}
/*
* init gets called once at the start and then never again,
* triggers box-sizing calculations and updates width and height
*/
function init(){
if(apply){
updateBorderBoxWidth();
updateBorderBoxHeight();
}
}
/*
* checkPropertyChange gets called as soon as an element property changes
* (see event binding at the top), it then checks if any property influencing its
* dimensions was changed and if yes recalculates width and height
*/
function checkPropertyChange(){
if(apply){
var pn = event.propertyName;
if(pn === "style.boxSizing" && element.style.boxSizing === ""){
element.style.removeAttribute("boxSizing");
element.runtimeStyle.removeAttribute("boxSizing");
element.runtimeStyle.removeAttribute("width");
element.runtimeStyle.removeAttribute("height");
}
switch (pn){
case "style.width":
case "style.minWidth":
case "style.maxWidth":
case "style.borderLeftWidth":
case "style.borderLeftStyle":
case "style.borderRightWidth":
case "style.borderRightStyle":
case "style.paddingLeft":
case "style.paddingRight":
updateBorderBoxWidth();
break;
case "style.height":
case "style.minHeight":
case "style.maxHeight":
case "style.borderTopWidth":
case "style.borderTopStyle":
case "style.borderBottomWidth":
case "style.borderBottomStyle":
case "style.paddingTop":
case "style.paddingBottom":
updateBorderBoxHeight();
break;
case "className":
case "style.boxSizing":
updateBorderBoxWidth();
updateBorderBoxHeight();
break;
}
}
}
/*
* Helper function, taken from Dean Edward's IE7 framework,
* added by Schepp on 12.06.2010.
* http://code.google.com/p/ie7-js/
*
* Allows us to convert from relative to pixel-values.
*/
function getPixelValue(value){
var PIXEL = /^\d+(px)?$/i;
if (PIXEL.test(value)) return parseInt(value);
var style = element.style.left;
var runtimeStyle = element.runtimeStyle.left;
element.runtimeStyle.left = element.currentStyle.left;
element.style.left = value || 0;
value = parseInt(element.style.pixelLeft);
element.style.left = style;
element.runtimeStyle.left = runtimeStyle;
return value;
}
function getPixelWidth(object, value){
// For Pixel Values
var PIXEL = /^\d+(px)?$/i;
if (PIXEL.test(value)) return parseInt(value);
// For Percentage Values
var PERCENT = /^[\d\.]+%$/i;
if (PERCENT.test(value)){
try{
var parentPaddingLeft = getPixelWidth(object.parentElement,object.parentElement.currentStyle.paddingLeft);
var parentPaddingRight = getPixelWidth(object.parentElement,object.parentElement.currentStyle.paddingRight);
var parentBorderLeft = getPixelWidth(object.parentElement,object.parentElement.currentStyle.borderLeftWidth);
var parentBorderRight = getPixelWidth(object.parentElement,object.parentElement.currentStyle.borderRightWidth);
//var parentWidth = getPixelWidth(object.parentElement,(object.parentElement.currentStyle.width != "auto" ? object.parentElement.currentStyle.width : "100%"));
var parentWidth = object.parentElement.offsetWidth - parentPaddingLeft - parentPaddingRight - parentBorderLeft - parentBorderRight;
var value = (parseFloat(value) / 100) * parentWidth;
}
catch(e){
var value = (parseFloat(value) / 100) * element.document.documentElement.clientWidth;
}
return parseInt(value);
}
// For EM Values
var style = object.style.left;
var runtimeStyle = object.runtimeStyle.left;
object.runtimeStyle.left = object.currentStyle.left;
object.style.left = value || 0;
value = parseInt(object.style.pixelLeft);
object.style.left = style;
object.runtimeStyle.left = runtimeStyle;
return value;
}
function getPixelHeight(object, value){
// For Pixel Values
var PIXEL = /^\d+(px)?$/i;
if (PIXEL.test(value)) return parseInt(value);
// For Percentage Values
var PERCENT = /^[\d\.]+%$/i;
if (PERCENT.test(value)){
try{
if(object.parentElement.currentStyle.height != "auto"){
switch(object.parentElement.nodeName){
default:
if(object.parentElement.currentStyle.height !== "auto"){
var parentPaddingTop = getPixelWidth(object.parentElement,object.parentElement.currentStyle.paddingTop);
var parentPaddingBottom = getPixelWidth(object.parentElement,object.parentElement.currentStyle.paddingBottom);
var parentBorderTop = getPixelWidth(object.parentElement,object.parentElement.currentStyle.borderTopWidth);
var parentBorderBottom = getPixelWidth(object.parentElement,object.parentElement.currentStyle.borderBottomWidth);
var parentHeight = object.parentElement.offsetHeight - parentPaddingTop - parentPaddingBottom - parentBorderTop - parentBorderBottom;
//var parentHeight = getPixelHeight(object.parentElement,object.parentElement.currentStyle.height);
value = (parseFloat(value) / 100) * parentHeight;
}
else {
value = "auto";
}
break;
case 'HTML':
parentHeight = element.document.documentElement.clientHeight;
if(parentHeight !== "auto"){
value = (parseFloat(value) / 100) * parentHeight;
}
else {
value = "auto";
}
break;
}
if(value !== "auto") value = parseInt(value);
}
else {
value = "auto";
}
}
catch(e){
value = "auto";
}
return value;
}
// For EM Values
var style = object.style.left;
var runtimeStyle = object.runtimeStyle.left;
object.runtimeStyle.left = object.currentStyle.left;
object.style.left = value || 0;
value = parseInt(object.style.pixelLeft);
object.style.left = style;
object.runtimeStyle.left = runtimeStyle;
return value;
}
/*
* getBorderWidth & friends
* Border width getters
*/
function getBorderWidth(sSide){
if(element.currentStyle["border" + sSide + "Style"] == "none"){
return 0;
}
var n = getPixelValue(element.currentStyle["border" + sSide + "Width"]);
return n || 0;
}
function getBorderLeftWidth() { return getBorderWidth("Left"); }
function getBorderRightWidth() { return getBorderWidth("Right"); }
function getBorderTopWidth() { return getBorderWidth("Top"); }
function getBorderBottomWidth() { return getBorderWidth("Bottom"); }
/*
* getPadding & friends
* Padding width getters
*/
function getPadding(sSide) {
var n = getPixelValue(element.currentStyle["padding" + sSide]);
return n || 0;
}
function getPaddingLeft() { return getPadding("Left"); }
function getPaddingRight() { return getPadding("Right"); }
function getPaddingTop() { return getPadding("Top"); }
function getPaddingBottom() { return getPadding("Bottom"); }
/*
* getBoxSizing
* Get the box-sizing value for the current element
*/
function getBoxSizing(){
var s = element.style;
var cs = element.currentStyle
if(typeof s.boxSizing != "undefined" && s.boxSizing != ""){
return s.boxSizing;
}
if(typeof s["box-sizing"] != "undefined" && s["box-sizing"] != ""){
return s["box-sizing"];
}
if(typeof cs.boxSizing != "undefined" && cs.boxSizing != ""){
return cs.boxSizing;
}
if(typeof cs["box-sizing"] != "undefined" && cs["box-sizing"] != ""){
return cs["box-sizing"];
}
return getDocumentBoxSizing();
}
/*
* getDocumentBoxSizing
* Get the default document box sizing (check for quirks mode)
*/
function getDocumentBoxSizing(){
if(doc.compatMode === null || doc.compatMode === "BackCompat"){
return "border-box";
}
return "content-box"
}
/*
* setBorderBoxWidth & friends
* Width and height setters
*/
function setBorderBoxWidth(n){
element.runtimeStyle.width = Math.max(0, n - getBorderLeftWidth() -
getPaddingLeft() - getPaddingRight() - getBorderRightWidth()) + "px";
}
function setBorderBoxMinWidth(n){
element.runtimeStyle.minWidth = Math.max(0, n - getBorderLeftWidth() -
getPaddingLeft() - getPaddingRight() - getBorderRightWidth()) + "px";
}
function setBorderBoxMaxWidth(n){
element.runtimeStyle.maxWidth = Math.max(0, n - getBorderLeftWidth() -
getPaddingLeft() - getPaddingRight() - getBorderRightWidth()) + "px";
}
function setBorderBoxHeight(n){
element.runtimeStyle.height = Math.max(0, n - getBorderTopWidth() -
getPaddingTop() - getPaddingBottom() - getBorderBottomWidth()) + "px";
}
function setBorderBoxMinHeight(n){
element.runtimeStyle.minHeight = Math.max(0, n - getBorderTopWidth() -
getPaddingTop() - getPaddingBottom() - getBorderBottomWidth()) + "px";
}
function setBorderBoxMaxHeight(n){
element.runtimeStyle.maxHeight = Math.max(0, n - getBorderTopWidth() -
getPaddingTop() - getPaddingBottom() - getBorderBottomWidth()) + "px";
}
function setContentBoxWidth(n){
element.runtimeStyle.width = Math.max(0, n + getBorderLeftWidth() +
getPaddingLeft() + getPaddingRight() + getBorderRightWidth()) + "px";
}
function setContentBoxMinWidth(n){
element.runtimeStyle.minWidth = Math.max(0, n + getBorderLeftWidth() +
getPaddingLeft() + getPaddingRight() + getBorderRightWidth()) + "px";
}
function setContentBoxMaxWidth(n){
element.runtimeStyle.maxWidth = Math.max(0, n + getBorderLeftWidth() +
getPaddingLeft() + getPaddingRight() + getBorderRightWidth()) + "px";
}
function setContentBoxHeight(n){
element.runtimeStyle.height = Math.max(0, n + getBorderTopWidth() +
getPaddingTop() + getPaddingBottom() + getBorderBottomWidth()) + "px";
}
function setContentBoxMinHeight(n){
element.runtimeStyle.minHeight = Math.max(0, n + getBorderTopWidth() +
getPaddingTop() + getPaddingBottom() + getBorderBottomWidth()) + "px";
}
function setContentBoxMaxHeight(n){
element.runtimeStyle.maxHeight = Math.max(0, n + getBorderTopWidth() +
getPaddingTop() + getPaddingBottom() + getBorderBottomWidth()) + "px";
}
/*
* updateBorderBoxWidth & updateBorderBoxHeight
*
*/
function updateBorderBoxWidth() {
if(getDocumentBoxSizing() == getBoxSizing()){
return;
}
var csw = element.currentStyle.width;
if(csw != "auto"){
csw = getPixelWidth(element,csw);
if(getBoxSizing() == "border-box"){
setBorderBoxWidth(parseInt(csw));
}
else{
setContentBoxWidth(parseInt(csw));
}
}
csw = element.currentStyle.minWidth;
if(csw != "none"){
csw = getPixelWidth(element,csw);
if(getBoxSizing() == "border-box"){
setBorderBoxMinWidth(parseInt(csw));
}
else{
setContentBoxMinWidth(parseInt(csw));
}
}
csw = element.currentStyle.maxWidth;
if(csw != "none"){
csw = getPixelWidth(element,csw);
if(getBoxSizing() == "border-box"){
setBorderBoxMaxWidth(parseInt(csw));
}
else{
setContentBoxMaxWidth(parseInt(csw));
}
}
}
function updateBorderBoxHeight() {
if(getDocumentBoxSizing() == getBoxSizing()){
return;
}
var csh = element.currentStyle.height;
if(csh != "auto"){
csh = getPixelHeight(element,csh);
if(csh !== "auto"){
if(getBoxSizing() == "border-box"){
setBorderBoxHeight(parseInt(csh));
}
else{
setContentBoxHeight(parseInt(csh));
}
}
}
csh = element.currentStyle.minHeight;
if(csh != "none"){
csh = getPixelHeight(element,csh);
if(csh !== "none"){
if(getBoxSizing() == "border-box"){
setBorderBoxMinHeight(parseInt(csh));
}
else{
setContentBoxMinHeight(parseInt(csh));
}
}
}
csh = element.currentStyle.maxHeight;
if(csh != "none"){
csh = getPixelHeight(element,csh);
if(csh !== "none"){
if(getBoxSizing() == "border-box"){
setBorderBoxMaxHeight(parseInt(csh));
}
else{
setContentBoxMaxHeight(parseInt(csh));
}
}
}
}
// Run the calculations
init();
//]]>
</script>
</component>
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