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让IE6支持min-width和max-width的方法

2010-06-25 00:00 537 查看
说明:让 IE6 及其以下版本支持 CSS 中 min/max-width/height 属性
@if (@_win32 && @_jscript_version>4) 
var minmax_elements; 
minmax_props= new Array( 
new Array('min-width', 'minWidth'), 
new Array('max-width', 'maxWidth'), 
new Array('min-height','minHeight'), 
new Array('max-height','maxHeight') 
); 
// Binding. Called on all new elements. If <body>, initialise; check all 
// elements for minmax properties 
function minmax_bind(el) { 
var i, em, ms; 
var st= el.style, cs= el.currentStyle; 
if (minmax_elements==window.undefined) { 
// initialise when body element has turned up, but only on IE 
if (!document.body || !document.body.currentStyle) return; 
minmax_elements= new Array(); 
window.attachEvent('onresize', minmax_delayout); 
// make font size listener 
em= document.createElement('div'); 
em.setAttribute('id', 'minmax_em'); 
em.style.position= 'absolute'; em.style.visibility= 'hidden'; 
em.style.fontSize= 'xx-large'; em.style.height= '5em'; 
em.style.top='-5em'; em.style.left= '0'; 
if (em.style.setExpression) { 
em.style.setExpression('width', 'minmax_checkFont()'); 
document.body.insertBefore(em, document.body.firstChild); 
} 
} 
// transform hyphenated properties the browser has not caught to camelCase 
for (i= minmax_props.length; i-->0;) 
if (cs[minmax_props[i][0]]) 
st[minmax_props[i][1]]= cs[minmax_props[i][0]]; 
// add element with properties to list, store optimal size values 
for (i= minmax_props.length; i-->0;) { 
ms= cs[minmax_props[i][1]]; 
if (ms && ms!='auto' && ms!='none' && ms!='0' && ms!='') { 
st.minmaxWidth= cs.width; st.minmaxHeight= cs.height; 
minmax_elements[minmax_elements.length]= el; 
// will need a layout later 
minmax_delayout(); 
break; 
} } 
} 
// check for font size changes 
var minmax_fontsize= 0; 
function minmax_checkFont() { 
var fs= document.getElementById('minmax_em').offsetHeight; 
if (minmax_fontsize!=fs && minmax_fontsize!=0) 
minmax_delayout(); 
minmax_fontsize= fs; 
return '5em'; 
} 
// Layout. Called after window and font size-change. Go through elements we 
// picked out earlier and set their size to the minimum, maximum and optimum, 
// choosing whichever is appropriate 
// Request re-layout at next available moment 
var minmax_delaying= false; 
function minmax_delayout() { 
if (minmax_delaying) return; 
minmax_delaying= true; 
window.setTimeout(minmax_layout, 0); 
} 
function minmax_stopdelaying() { 
minmax_delaying= false; 
} 
function minmax_layout() { 
window.setTimeout(minmax_stopdelaying, 100); 
var i, el, st, cs, optimal, inrange; 
for (i= minmax_elements.length; i-->0;) { 
el= minmax_elements[i]; st= el.style; cs= el.currentStyle; 
// horizontal size bounding 
st.width= st.minmaxWidth; optimal= el.offsetWidth; 
inrange= true; 
if (inrange && cs.minWidth && cs.minWidth!='0' && cs.minWidth!='auto' && cs.minWidth!='') { 
st.width= cs.minWidth; 
inrange= (el.offsetWidth<optimal); 
} 
if (inrange && cs.maxWidth && cs.maxWidth!='none' && cs.maxWidth!='auto' && cs.maxWidth!='') { 
st.width= cs.maxWidth; 
inrange= (el.offsetWidth>optimal); 
} 
if (inrange) st.width= st.minmaxWidth; 
// vertical size bounding 
st.height= st.minmaxHeight; optimal= el.offsetHeight; 
inrange= true; 
if (inrange && cs.minHeight && cs.minHeight!='0' && cs.minHeight!='auto' && cs.minHeight!='') { 
st.height= cs.minHeight; 
inrange= (el.offsetHeight<optimal); 
} 
if (inrange && cs.maxHeight && cs.maxHeight!='none' && cs.maxHeight!='auto' && cs.maxHeight!='') { 
st.height= cs.maxHeight; 
inrange= (el.offsetHeight>optimal); 
} 
if (inrange) st.height= st.minmaxHeight; 
} 
} 
// Scanning. Check document every so often until it has finished loading. Do 
// nothing until <body> arrives, then call main init. Pass any new elements 
// found on each scan to be bound 
var minmax_SCANDELAY= 500; 
function minmax_scan() { 
var el; 
for (var i= 0; i<document.all.length; i++) { 
el= document.all[i]; 
if (!el.minmax_bound) { 
el.minmax_bound= true; 
minmax_bind(el); 
} } 
} 
var minmax_scanner; 
function minmax_stop() { 
window.clearInterval(minmax_scanner); 
minmax_scan(); 
} 
minmax_scan(); 
minmax_scanner= window.setInterval(minmax_scan, minmax_SCANDELAY); 
window.attachEvent('onload', minmax_stop); 
@end @*/

由于只有 IE6 及其以下版本不支持min/max-width/height 属性,因此,我们可以用下面的调用方式:
Code:
<!--[if lt IE 7]> 
<script type="text/javascript" src="minmax.js"></script> 
<![endif]-->
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