libcrossbrowser.js

征服AJAX+LUCENE构建搜索引擎的源码

LCB_version = 2.8;
// _mac : true = macintosh, false = other os
_mac=navigator.userAgent.indexOf('Mac')!=-1;
// _ie512 : true = MSIE 5.12(mac), false = others
_ie512=navigator.userAgent.indexOf('MSIE 5.12')!=-1;
// _dom : kind of DOM.
//        IE4 = 1, IE5+ = 2, NN4 = 3, NN6+ = 4, others = 0
_dom = document.all?(document.getElementById?2:1)
                   :(document.getElementById?4:(document.layers?3:0));
_createLayerNo = 0;                    // layer no.

function initCrossBrowserLib(){
  _mac=navigator.userAgent.indexOf('Mac')!=-1;
  _ie512=navigator.userAgent.indexOf('MSIE 5.12')!=-1;
  _dom=document.all?(document.getElementById?2:1)
                     :(document.getElementById?4:(document.layers?3:0));
  _createLayerNo=0;
}
initCrossBrowserLib();


/* _____________________________________________________________________ */
function getWindowWidth (){
  if(_dom==4 || _dom==3) return window.innerWidth;
  if(_dom==2 || _dom==1) return document.body.clientWidth;
  return 0;
}

function getWindowHeight(){
  if(_dom==4 || _dom==3) return window.innerHeight;
  if(_dom==2 || _dom==1) return document.body.clientHeight;
  return 0;
}

function getWinXOffset(){
  if(_dom==4)            return window.scrollX;
  if(_dom==2 || _dom==1) return document.body.scrollLeft;
  if(_dom==3)            return window.pageXOffset;
  return 0;
}

function getWinYOffset(){
  if(_dom==4)            return window.scrollY;
  if(_dom==2 || _dom==1) return document.body.scrollTop;
  if(_dom==3)            return window.pageYOffset;
  return 0;
}

function getDivFromName(nm){
  if(_dom==4 || _dom==2) return document.getElementById(nm);
  if(_dom==1)            return document.all(nm);
  if(_dom==3){
    var s='';
    for(var i=1; i<arguments.length; i++) s+='document.layers.'+arguments[i]+'.';
    return eval(s+'document.layers.'+nm);
  }
  return null;
}

function getDivName(div){
  if(_dom==4 || _dom==2 || _dom==1) return div.id;
  if(_dom==3)                       return div.name;
  return '';
}

function createLayer(left,top,width,height,parentDiv){
  var s='';
  if(arguments.length>5){
    for(var i=5; i<arguments.length; i++) s+=arguments[i];
  }
  if(_dom==4){
    var divName= '_js_layer_'+_createLayerNo; _createLayerNo++;
    var pDiv   =parentDiv?parentDiv:document.body;
    var div    =document.createElement('DIV');
    div.id=divName;
    div.setAttribute('style',
       'position:absolute;left:'+left+';top:'+top
      +(width >0?(';width:' +width ):'')
      +(height>0?(';height:'+height):'')
      +';visibility:hidden');
    var range=document.createRange();
    range.selectNodeContents(div);
    range.collapse(true);
    var cf=range.createContextualFragment(s);
    div.appendChild(cf);
    pDiv.appendChild(div);
    return div;
  }
  if(_dom==2 || _dom==1){
    var adj    =(_mac&&!_ie512)?' ':'';
    var divName= '_js_layer_'+_createLayerNo; _createLayerNo++;
    var ha     =(height>0)?(';height:'+height):'';
    var pDiv   =parentDiv?parentDiv:document.body;
    pDiv.insertAdjacentHTML('BeforeEnd',
       '<div id="'+divName
      +'" style="position:absolute;left:'+left+';top:'+top
      +(width >0?(';width:' +width ):';width:1')
      +(height>0?(';height:'+height):'')
      +';visibility:hidden;">'+s+'<\/div>'+adj);
    return document.all(divName);
  }
  if(_dom==3){
    var div=parentDiv?(new Layer(width,parentDiv)):(new Layer(width));
    if(height>0) div.resizeTo(width,height);
    div.moveTo(left,top);
    if(s!=''){
      div.document.open('text/html','replace');
      div.document.write(s);
      div.document.close();
    }
    return div;
  }
  return null;
}

function createExLayer(url,left,top,width,height,parentDiv){
  if(_dom==4){
    var divName= '_js_layer_'+_createLayerNo; _createLayerNo++;
    var pDiv   =parentDiv?parentDiv:document.body;
    var div    =document.createElement('IFRAME');
    div.id=divName;
    div.name=divName;
    div.setAttribute('style',
       'position:absolute;left:'+left+';top:'+top
      +';width:'+width+(height>0?(';height:'+height):'')
      +';visibility:hidden');
    div.setAttribute('src',url);
    div.setAttribute('frameborder',0);
    div.setAttribute('scrolling','no');
    pDiv.appendChild(div);
    return div;
  }
  if(_dom==2 || _dom==1){
    var adj=(_mac&&_ie512)?' ':'';
    var bd, divName='_js_layer_'+_createLayerNo;
    _createLayerNo++;
    var ha=(height>0)?(';height:'+height):'';
    if(arguments.length>5 && parentDiv)
         bd=parentDiv;
    else bd=document.body;
    bd.insertAdjacentHTML('BeforeEnd',
       '<div id="'+divName
      +'" style="position:absolute;left:'+left+';top:'+top
      +';width:'+width+ha+';visibility:hidden;">'
      +'<iframe src="'+url+'" name="'+divName+'_if" '
      +'width='+width+' height='+height
      +'marginwidth=0 marginheight=0 '
      +'scrolling="no" frameborder="no">'
      +'<\/iframe>'
      +'<\/div>'+adj);
    return document.all(divName);
  }
  if(_dom==3){
    var div=parentDiv?(new Layer(width,parentDiv)):(new Layer(width));
    if(height>0) div.resizeTo(width,height);
    div.moveTo(left,top);
    div.load(url,width);
    return div;
  }
  return null;
}

function getDivImage(div,imgName){
  if(_dom==4)            return document.images[imgName];
  if(_dom==2 || _dom==1) return document.images(imgName);
  if(_dom==3)            return div.document.images[imgName];
  return null;
}

function getDivForm(div,frmName){
  if(_dom==4)            return document.forms[frmName];
  if(_dom==2 || _dom==1) return document.forms(frmName);
  if(_dom==3)            return div.document.forms[frmName];
  return null;
}

function initDivPos(div){
  if(_dom==4){
    div.style.left=div.offsetLeft+'px';
    div.style.top =div.offsetTop +'px';
  }
  else if(_dom==2 || _dom==1){
    div.style.pixelLeft=div.offsetLeft;
    div.style.pixelTop =div.offsetTop;
  }
  return div;
}

function getDivLeft(div){
  if(_dom==4 || _dom==2) return div.offsetLeft;
  if(_dom==1)            return div.style.pixelLeft;
  if(_dom==3)            return div.left;
  return 0;
}

function getDivTop(div){
  if(_dom==4 || _dom==2) return div.offsetTop;
  if(_dom==1)            return div.style.pixelTop;
  if(_dom==3)            return div.top;
  return 0;
}

function moveDivTo(div,left,top){
  if(_dom==4){
    div.style.left=left+'px';
    div.style.top =top +'px';
    return;
  }
  if(_dom==2 || _dom==1){
    div.style.pixelLeft=left;
    div.style.pixelTop =top;
    return;
  }
  if(_dom==3){
    div.moveTo(left,top);
    return;
  }
}

function moveDivBy(div,left,top){
  if(_dom==4){
    div.style.left=div.offsetLeft+left;
    div.style.top =div.offsetTop +top;
    return;
  }
  if(_dom==2){
    div.style.pixelLeft=div.offsetLeft+left;
    div.style.pixelTop =div.offsetTop +top;
    return;
  }
  if(_dom==1){
    div.style.pixelLeft+=left;
    div.style.pixelTop +=top;
    return;
  }
  if(_dom==3){
    div.moveBy(left,top);
    return;
  }
}

function scrollExlHItTo(exdiv,x){
  if(_dom==4){
    frames[exdiv.id].scrollTo(x,frames[exdiv.id].scrollY);
    return;
  }
  if(_dom==2 || _dom==1){
    frames(exdiv.id+'_if').scrollTo(x,frames(exdiv.id+'_if').document.body.scrollTop);
    return;
  }
  if(_dom==3){
    var dx=x-exdiv.clip.left, ch=exdiv.clip.width;
    exdiv.left-=dx;
    exdiv.clip.left=x; exdiv.clip.width=ch;
    return;
  }
  return;
}

function scrollExlVItTo(exdiv,y){
  if(_dom==4){
    frames[exdiv.id].scrollTo(frames[exdiv.id].scrollX,y);
    return;
  }
  if(_dom==2 || _dom==1){
    frames(exdiv.id+'_if').scrollTo(frames(exdiv.id+'_if').document.body.scrollLeft,y);
    return;
  }
  if(_dom==3){
    var dy=y-exdiv.clip.top, ch=exdiv.clip.height;
    exdiv.top-=dy;
    exdiv.clip.top=y; exdiv.clip.height=ch;
    return;
  }
  return;
}

function initDivSize(div){
  if(_dom==4){
    // getComputedStyle is buggy in NN6, and wrong in Mozilla 0.8/9
    //
    // var style=document.defaultView.getComputedStyle(div,null);
    // div.style.width =style.getPropertyValue('width' );
    // div.style.height=style.getPropertyValue('height');
    //
    div.style.width =div.offsetWidth +'px';
    div.style.height=div.offsetHeight+'px';
    //
    // need border-width=0px, margin-width:0px
  }
  else if(_dom==2 || _dom==1){
    div.style.pixelWidth =div.offsetWidth;
    div.style.pixelHeight=div.offsetHeight;
  }
  return div;
}

function getDivWidth (div){
  if(_dom==4 || _dom==2) return div.offsetWidth;
  if(_dom==1)            return div.style.pixelWidth;
  if(_dom==3)            return div.clip.width;
  return 0;
}

function getDivHeight(div){
  if(_dom==4 || _dom==2) return div.offsetHeight;
  if(_dom==1)            return div.style.pixelHeight;
  if(_dom==3)            return div.clip.height;
  return 0;
}

function resizeDivTo(div,width,height){
  if(_dom==4){
    div.style.width =width +'px';
    div.style.height=height+'px';
    return;
  }
  if(_dom==2 || _dom==1){
    div.style.pixelWidth =width;
    div.style.pixelHeight=height;
    return;
  }
  if(_dom==3){
    div.resizeTo(width,height);
    return;
  }
}

function resizeDivBy(div,width,height){
  if(_dom==4){
    div.style.width =(div.offsetWidth +width )+'px';
    div.style.height=(div.offsetHeight+height)+'px';
    return;
  }
  if(_dom==2){
    div.style.pixelWidth =div.offsetWidth +width;
    div.style.pixelHeight=div.offsetHeight+height;
    return;
  }
  if(_dom==1){
    div.style.pixelWidth +=width;
    div.style.pixelHeight+=height;
    return;
  }
  if(_dom==3){
    div.resizeBy(width,height);
    return;
  }
}

function getExlWidth (exdiv){
  if(_dom==4)
    // NN6 is buggy( same exdiv.offsetWidth )
    return exdiv.contentDocument.body.offsetWidth;
  if(_dom==2 || _dom==1)
    return _mac?frames(exdiv.id+'_if').document.body.offsetWidth
               :frames(exdiv.id+'_if').document.body.scrollWidth;
  if(_dom==3)
    return exdiv.document.width;
  return 0;
}

function getExlHeight(exdiv){
  if(_dom==4)
    return exdiv.contentDocument.body.offsetHeight;
  if(_dom==2 || _dom==1)
    return _mac?frames(exdiv.id+'_if').document.body.offsetHeight
               :frames(exdiv.id+'_if').document.body.scrollHeight;
  if(_dom==3)
    return exdiv.document.height;
  return 0;
}

function setDivVisibility(div,visible){
  if(_dom==4 || _dom==2 || _dom==1){
    div.style.visibility=(visible)?'inherit':'hidden';
    return;
  }
  if(_dom==3){
    div.visibility      =(visible)?'inherit':'hide';
    return;
  }
}

function setDivVisibilities(divs,visible){
  if(_dom==4 || _dom==2 || _dom==1){
    for(var i=0; i<divs.length; i++)
      divs[i].style.visibility=(visible)?'inherit':'hidden';
  }
  if(_dom==3){
    for(var i=0; i<divs.length; i++)
      divs[i].visibility      =(visible)?'inherit':'hide';
  }
  return divs;
}

function setDivClip(div,top,right,bottom,left){
  if(_dom==4 || _dom==2 || _dom==1){
    div.style.clip='rect('+top+'px '+right+'px '+bottom+'px '+left+'px)';
    return;
  }
  if(_dom==3){
    div.clip.top   =top;   div.clip.right=right;
    div.clip.bottom=bottom;div.clip.left =left;
    return;
  }
}

function writeDivHTML(div,op,cl){
  var s='';
  for(var i=3; i<arguments.length; i++) s+=arguments[i];
  if(_dom==4){
    if(op){ while(div.hasChildNodes()) div.removeChild(div.lastChild); }
    var range=document.createRange();
    range.selectNodeContents(div);
    range.collapse(true);
    var cf=range.createContextualFragment(s);
    div.appendChild(cf);
    return;
  }
  if(_dom==2 || _dom==1){
    if(op)   div.innerHTML='';
    if(_mac&&!_ie512) div.innerHTML+=s;
    else     div.insertAdjacentHTML('BeforeEnd',s);
    return;
  }
  if(_dom==3){
    if(op) div.document.open('text/html','replace');
    div.document.write(s);
    if(cl) div.document.close();
    return;
  }
}

function setDivBackgroundColor(div,color){
  if(color==null) color='transparent';
  if(_dom==3) div.bgColor=color;
  else        div.style.backgroundColor=color;
}

function setDivBackgroundImage(div,url){
  if(_dom==3) div.background.src=url?url:null;
  else        div.style.backgroundImage=url?('url('+url+')'):'none';
}

function setDivZIndex(div,order){
  if(_dom==4 || _dom==2 || _dom==1){
    div.style.zIndex=order;
    return;
  }
  if(_dom==3){
    div.zIndex      =order;
    return;
  }
}

function setDivStyleAttribute(div,nm,value){
  if(_dom!=0 && _dom!=3) eval('div.style.'+nm+'=value');
  return div;
}

function changeExlURL(exdiv,url){
  if(_dom==4){
    exdiv.setAttribute('src',url);
    return;
  }
  if(_dom==2 || _dom==1){
    frames(exdiv.id+'_if').location.replace(url);
    return;
  }
  if(_dom==3){
    exdiv.load(url,exdiv.clip.width);
    return;
  }
  return;
}

function getLeftFromEvent(e){
  if(_dom==4)          return e.clientX+window.scrollX;
  if(_dom==2||_dom==1) return document.body.scrollLeft+window.event.clientX;
  if(_dom==3)          return e.pageX;
  return 0;
}
function getTopFromEvent(e){
  if(_dom==4)          return e.clientY+window.scrollY;
  if(_dom==2||_dom==1) return document.body.scrollTop+window.event.clientY;
  if(_dom==3)          return e.pageY;
  return 0;
}