1 // fixed.js: fix fixed positioning and fixed backgrounds in IE/Win
\r// version 1.8, 08-Aug-2003
\r// written by Andrew Clover <and@doxdesk.com>, use freely
\r\r/*@cc_on
\r@if (@_win32 && @_jscript_version>4)
\r\rvar fixed_positions= new Array();
\rvar fixed_backgrounds= new Array();
\rvar fixed_viewport;
\r\r// Initialisation. Called when the <body> tag arrives. Set up viewport so the
\r// rest of the script knows we're going, and add a measurer div, used to detect
\r// font size changes and measure image sizes for backgrounds later
\r\rfunction fixed_init() {
\r fixed_viewport= (document.compatMode=='CSS1Compat') ?
\r document.documentElement : document.body;
\r var el= document.createElement('div');
\r el.setAttribute('id', 'fixed-measure');
\r el.style.position= 'absolute';
\r el.style.top= '0'; el.style.left= '0';
\r el.style.overflow= 'hidden'; el.style.visibility= 'hidden';
\r el.style.fontSize= 'xx-large'; el.style.height= '5em';
\r el.style.setExpression('width', 'fixed_measureFont()');
\r document.body.insertBefore(el, document.body.firstChild);
\r}
\r\r// Binding. Called every time an element is added to the document, check it
\r// for fixed features, if found add to our lists and set initial props
\r\rfunction fixed_bind(el) {
\r var needLayout= false;
\r var tag= el.tagName.toLowerCase();
\r var st= el.style;
\r var cst= el.currentStyle;
\r var anc;
\r\r // find fixed-position elements
\r if (cst.position=='fixed') {
\r needLayout= true;
\r fixed_positions[fixed_positions.length]= el;
\r // store original positioning as we'll overwrite it
\r st.position= 'absolute';
\r st.fixedPLeft= cst.left;
\r st.fixedPTop= cst.top;
\r st.fixedPRight= cst.right;
\r st.fixedPBottom= cst.bottom;
\r st.fixedPWidth= fixed_parseLength(cst.width);
\r st.fixedPHeight= fixed_parseLength(cst.height);
\r // find element that will act as containing box, for convenience later
\r st.fixedCB= null;
\r for (anc= el; (anc= anc.parentElement).parentElement;) {
\r if (anc.currentStyle.position!='static') {
\r st.fixedCB= anc;
\r break;
\r } }
\r // detect nested fixed positioning (only ancestor need move)
\r st.fixedNest= false;
\r for (anc= el; anc= anc.parentElement;) {
\r if (anc.style.fixedNest!=null)
\r st.fixedNest= true;
\r break;
\r }
\r }
\r\r // find fixed-background elements (not body/html which IE already gets right)
\r if (cst.backgroundAttachment=='fixed' && tag!='body' && tag!='html') {
\r needLayout= true;
\r fixed_backgrounds[fixed_backgrounds.length]= el;
\r // get background offset, converting from keyword if necessary
\r st.fixedBLeft= fixed_parseLength(cst.backgroundPositionX);
\r st.fixedBTop= fixed_parseLength(cst.backgroundPositionY);
\r // if it's a non-zero %age, need to know size of image for layout
\r if (st.fixedBLeft[1]=='%' || st.fixedBTop[1]=='%') {
\r st.fixedBWidth= 0; st.fixedBHeight= 0;
\r fixed_measureBack(el);
\r }
\r }
\r if (needLayout) fixed_layout();
\r}
\r\r// Layout. On every window or font size change, recalculate positioning
\r\r// Request re-layout at next free moment
\rvar fixed_delaying= false;
\rfunction fixed_delayout() {
\r if (fixed_delaying) return;
\r fixed_delaying= true;
\r window.setTimeout(fixed_layout, 0);
\r}
\r\rvar fixed_ARBITRARY= 200;
\r\rfunction fixed_layout() {
\r fixed_delaying= false;
\r if (!fixed_viewport) return;
\r var i, el, st, j, pr, tmp, A= 'auto';
\r var cb, cbLeft, cbTop, cbRight, cbBottom, oLeft, oTop, oRight, oBottom;
\r var vpWidth=fixed_viewport.clientWidth, vpHeight=fixed_viewport.clientHeight;
\r\r // calculate initial position for fixed-position elements [black magic]
\r for (i= fixed_positions.length; i-->0;) {
\r el= fixed_positions[i]; st= el.style;
\r // find positioning of containing block
\r cb= st.fixedCB; if (!cb) cb= fixed_viewport;
\r cbLeft= fixed_pageLeft(cb); cbTop= fixed_pageTop(cb);
\r if (cb!=fixed_viewport) { cbLeft+= cb.clientLeft; cbTop+= cb.clientTop; }
\r cbRight= fixed_viewport.clientWidth-cbLeft-cb.clientWidth;
\r cbBottom= fixed_viewport.clientHeight-cbTop-cb.clientHeight;
\r // if size is in %, must recalculate relative to viewport
\r if (st.fixedPWidth[1]=='%')
\r st.width= Math.round(vpWidth*st.fixedPWidth[0]/100)+'px';
\r if (st.fixedPHeight[1]=='%')
\r st.height= Math.round(vpHeight*st.fixedPHeight[0]/100)+'px';
\r // find out offset values at max size, to account for margins
\r st.left= A; st.right= '0'; st.top= A; st.bottom= '0';
\r oRight= el.offsetLeft+el.offsetWidth; oBottom= el.offsetTop+el.offsetHeight;
\r st.left= '0'; st.right= A; st.top= '0'; st.bottom= A;
\r oLeft= el.offsetLeft; oTop= el.offsetTop;
\r // use this to convert all edges to pixels
\r st.left= A; st.right= st.fixedPRight;
\r st.top= A; st.bottom= st.fixedPBottom;
\r oRight-= el.offsetLeft+el.offsetWidth;
\r oBottom-= el.offsetTop+el.offsetHeight;
\r st.left= st.fixedPLeft; st.top= st.fixedPTop;
\r oLeft= el.offsetLeft-oLeft; oTop= el.offsetTop-oTop;
\r // edge positioning fix
\r if (st.fixedPWidth[1]==A && st.fixedPLeft!=A && st.fixedPRight!=A) {
\r tmp= el.offsetLeft; st.left= A; st.width= fixed_ARBITRARY+'px';
\r tmp= fixed_ARBITRARY+el.offsetLeft-tmp+cbLeft+cbRight;
\r st.left= st.fixedPLeft; st.width= ((tmp<1)?1:tmp)+'px';
\r }
\r if (st.fixedPHeight[1]==A && st.fixedPTop!=A && st.fixedPBottom!=A) {
\r tmp= el.offsetTop; st.top= A; st.height= fixed_ARBITRARY+'px';
\r tmp= fixed_ARBITRARY+el.offsetTop-tmp+cbTop+cbBottom;
\r st.top= st.fixedPTop; st.height= ((tmp<1)?1:tmp)+'px';
\r }
\r // move all non-auto edges relative to the viewport
\r st.fixedCLeft= (st.fixedPLeft=='auto') ? oLeft : oLeft-cbLeft;
\r st.fixedCTop= (st.fixedPTop=='auto') ? oTop : oTop-cbTop;
\r st.fixedCRight= (st.fixedPRight=='auto') ? oRight : oRight-cbRight;
\r st.fixedCBottom= (st.fixedPBottom=='auto') ? oBottom : oBottom-cbBottom;
\r // remove left-positioning of right-positioned elements
\r if (st.fixedPLeft=='auto' && st.fixedPRight!='auto') st.fixedCLeft= 'auto';
\r if (st.fixedPTop=='auto' && st.fixedPBottom!='auto') st.fixedCTop= 'auto';
\r }
\r\r\r // calculate initial positioning of fixed backgrounds
\r for (i= fixed_backgrounds.length; i-->0;) {
\r el= fixed_backgrounds[i]; st= el.style;
\r tmp= st.fixedBImage;
\r if (tmp) {
\r if (tmp.readyState!='uninitialized') {
\r st.fixedBWidth= tmp.offsetWidth;
\r st.fixedBHeight= tmp.offsetHeight;
\r st.fixedBImage= window.undefined;
\r }
\r }
\r st.fixedBX= fixed_length(el, st.fixedBLeft, vpWidth-st.fixedBWidth);
\r st.fixedBY= fixed_length(el, st.fixedBTop, vpHeight-st.fixedBHeight);
\r }
\r\r // now call scroll() to set the positions from the values just calculated
\r fixed_scroll();
\r}
\r\r// Scrolling. Offset fixed elements relative to viewport scrollness
\r\rvar fixed_lastX, fixed_lastY;
\rvar fixed_PATCHDELAY= 300;
\rvar fixed_patching= false;
\r\r// callback function after a scroll, because incorrect scroll position is
\r// often reported first go!
\rfunction fixed_patch() {
\r fixed_patching= false;
\r var scrollX= fixed_viewport.scrollLeft, scrollY= fixed_viewport.scrollTop;
\r if (scrollX!=fixed_lastX && scrollY!=fixed_lastY) fixed_scroll();
\r}
\r\rfunction fixed_scroll() {
\r if (!fixed_viewport) return;
\r var i, el, st, viewportX, viewportY;
\r var scrollX= fixed_viewport.scrollLeft, scrollY= fixed_viewport.scrollTop;
\r fixed_lastX= scrollX; fixed_lastY= scrollY;
\r\r // move non-nested fixed-position elements
\r for (i= fixed_positions.length; i-->0;) {
\r st= fixed_positions[i].style;
\r viewportX= (st.fixedNest) ? 0 : scrollX;
\r viewportY= (st.fixedNest) ? 0 : scrollY;
\r if (st.fixedCLeft!='auto') st.left= (st.fixedCLeft+viewportX)+'px';
\r if (st.fixedCTop!='auto') st.top= (st.fixedCTop+viewportY)+'px';
\r viewportX= (st.fixedCB==null || st.fixedCB==fixed_viewport) ? 0 : viewportX;
\r viewportY= (st.fixedCB==null || st.fixedCB==fixed_viewport) ? 0 : viewportY;
\r st.right= (st.fixedCRight-viewportX+1)+'px'; st.right= (st.fixedCRight-viewportX)+'px';
\r st.bottom= (st.fixedCBottom-viewportY+1)+'px'; st.bottom= (st.fixedCBottom-viewportY)+'px';
\r }
\r\r // align fixed backgrounds to viewport
\r for (i= fixed_backgrounds.length; i-->0;) {
\r el= fixed_backgrounds[i]; st= el.style;
\r viewportX= scrollX;
\r viewportY= scrollY;
\r while (el.offsetParent) {
\r viewportX-= el.offsetLeft+el.clientLeft;
\r viewportY-= el.offsetTop +el.clientTop;
\r el= el.offsetParent;
\r }
\r st.backgroundPositionX= (st.fixedBX+viewportX)+'px';
\r st.backgroundPositionY= (st.fixedBY+viewportY)+'px';
\r }
\r\r // call back again in a tic
\r if (!fixed_patching) {
\r fixed_patching= true;
\r window.setTimeout(fixed_patch, fixed_PATCHDELAY);
\r }
\r}
\r\r// Measurement. Load bg-image into an invisible element on the page, when
\r// loaded write the width/height to an element's style for layout use; detect
\r// when font size changes
\r\rfunction fixed_measureBack(el) {
\r var measure= document.getElementById('fixed-measure');
\r var img= document.createElement('img');
\r img.setAttribute('src', fixed_parseURL(el.currentStyle.backgroundImage));
\r measure.appendChild(img);
\r el.style.fixedBImage= img;
\r if (img.readyState=='uninitialized')
\r img.attachEvent('onreadystatechange', fixed_measureBackImage_ready);
\r}
\r\rfunction fixed_measureBackImage_ready() {
\r var img= event.srcElement;
\r if (img && img.readyState!='uninitialized') {
\r img.detachEvent('onreadystatechange', fixed_measureBackImage_ready);
\r fixed_layout();
\r }
\r}
\r\rvar fixed_fontsize= 0;
\rfunction fixed_measureFont() {
\r var fs= document.getElementById('fixed-measure').offsetHeight;
\r if (fixed_fontsize!=fs && fixed_fontsize!=0)
\r fixed_delayout();
\r fixed_fontsize= fs;
\r return '5em';
\r}
\r\r// Utility. General-purpose functions
\r\r// parse url() to get value inside
\r\rfunction fixed_parseURL(v) {
\r v= v.substring(4, v.length-1);
\r if (v.charAt(0)=='"' && v.charAt(v.length-1)=='"' ||
\r v.charAt(0)=="'" && v.charAt(v.length-1)=="'")
\r return v.substring(1, v.length-1);
\r else return v;
\r}
\r\r// parse length or auto or background-position keyword into number and unit
\r\rvar fixed_numberChars= '+-0123456789.';
\rvar fixed_ZERO= new Array(0, 'px');
\rvar fixed_50PC= new Array(50, '%');
\rvar fixed_100PC= new Array(100, '%');
\rvar fixed_AUTO= new Array(0, 'auto');
\r\rfunction fixed_parseLength(v) {
\r var num, i;
\r if (v=='left' || v=='top') return fixed_ZERO;
\r if (v=='right' || v=='bottom') return fixed_100PC;
\r if (v=='center') return fixed_50PC;
\r if (v=='auto') return fixed_AUTO;
\r i= 0;
\r while (i<v.length && fixed_numberChars.indexOf(v.charAt(i))!=-1)
\r i++;
\r num= parseFloat(v.substring(0, i));
\r if (num==0) return fixed_ZERO;
\r else return new Array(num, v.substring(i));
\r}
\r\r// convert parsed (number, unit) into a number of pixels
\r\rfunction fixed_length(el, l, full) {
\r var tmp, x;
\r if (l[1]=='px') return l[0];
\r if (l[1]=='%') return Math.round(full*l[0]/100);
\r // other units - measure by setting position; this is rather inefficient
\r // but then these units are used for background-position so seldom...
\r tmp= el.currentStyle.left;
\r el.style.left= '0';
\r x= el.offsetLeft;
\r el.style.left= l[0]+l[1];
\r x= el.offsetLeft-x;
\r el.style.left= tmp;
\r return x;
\r}
\r\r// convert stupid IE offsetLeft/Top to page-relative values
\r\rfunction fixed_pageLeft(el) {
\r var v= 0;
\r while (el.offsetParent) {
\r v+= el.offsetLeft;
\r el= el.offsetParent;
\r }
\r return v;
\r}
\rfunction fixed_pageTop(el) {
\r var v= 0;
\r while (el.offsetParent) {
\r v+= el.offsetTop;
\r el= el.offsetParent;
\r }
\r return v;
\r}
\r\r// Scanning. Check document every so often until it has finished loading. Do
\r// nothing until <body> arrives, then call main init. Pass any new elements
\r// found on each scan to be bound
\r\rvar fixed_SCANDELAY= 500;
\r\rfunction fixed_scan() {
\r if (!document.body) return;
\r if (!fixed_viewport) fixed_init();
\r var el;
\r for (var i= 0; i<document.all.length; i++) {
\r el= document.all[i];
\r if (!el.fixed_bound) {
\r el.fixed_bound= true;
\r fixed_bind(el);
\r } }
\r}
\r\rvar fixed_scanner;
\rfunction fixed_stop() {
\r window.clearInterval(fixed_scanner);
\r fixed_scan();
\r}
\r\rfixed_scan();
\rfixed_scanner= window.setInterval(fixed_scan, fixed_SCANDELAY);
\rwindow.attachEvent('onload', fixed_stop);
\rwindow.attachEvent('onresize', fixed_delayout);
\rwindow.attachEvent('onscroll', fixed_scroll);
\r\r@end @*/
\r
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