解决ie6不支持min/max-width/height属性办法

此办法为引用javascript 处理不支持最大最小属性的问题,不用修改其他样式,不影响源文件。

代码如下:可命名为 minmax.js

 

// 说明:让 IE6 及其以下版本支持 CSS 中 min/max-width/height 属性 
// 整理:http://www.111cn.net 
// minmax.js: make IE5+/Win support CSS min/max-width/height 
// version 1.0, 08-Aug-2003 
// written by Andrew Clover <[email protected]>, use freely 
  
/*@cc_on 
@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:
 代码如下

<!--[if lt IE 7]>
<script type="text/javascript" src="minmax.js"></script>
<![endif]-->

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