// JavaScript Document
pn = {
 //css class
 paginationClass:'pagelist',
 dynamicClass:'dynamic',
 showClass:'show',
 paginationNavClass:'paginatedNav',
 
 //设置每页显示数据条数
 increase : 5,
 //分页导航的替换文本
 counter:'  _x_到_y_条  共_z_条  ',
 nextLabel:'下一页',
 previousLabel:'上一页',
 
 init:function(){
     var tablebody;
  if(!document.getElementById || !document.createTextNode){return;}
  var ts=document.getElementsByTagName('table');
  for(var i=0;i<ts.length;i++){
   if(!DOMhelp.cssjs('check',ts[i],pn.paginationClass)){continue;}
   if(ts[i].getElementsByTagName('tr').length<pn.increase+1){continue;}
   tablebody=ts[i].getElementsByTagName('tbody')[0];
   ts[i].datarows=tablebody.getElementsByTagName('tr');
   ts[i].datarowsize=ts[i].datarows.length;
   ts[i].current=null;
   DOMhelp.cssjs('add',ts[i],pn.dynamicClass);
   pn.createPaginationNav(ts[i]);
   pn.showSection(ts[i],0);
  }
 },
 createPaginationNav:function(table){
  var navBefore,navAfter;
  navBefore=document.createElement('p');
  DOMhelp.cssjs('add',navBefore,pn.paginationNavClass);
  navBefore.appendChild(DOMhelp.createLink('#',pn.previousLabel));
  navBefore.appendChild(document.createElement('span'));
  counter=pn.counter.replace('_x_',1);
  counter=counter.replace('_y_',pn.increase);
  counter=counter.replace('_z_',table.datarowsize-1);
  navBefore.getElementsByTagName('span')[0].innerHTML=counter;
  navBefore.appendChild(DOMhelp.createLink('#',pn.nextLabel));
  table.parentNode.insertBefore(navBefore,table);
  navAfter=navBefore.cloneNode(true);
  table.parentNode.insertBefore(navAfter,table.nextSibling);
  table.topPrev=navBefore.getElementsByTagName('a')[0];
  table.topNext=navBefore.getElementsByTagName('a')[1];
  table.bottomPrev=navAfter.getElementsByTagName('a')[0];
  table.bottomNext=navAfter.getElementsByTagName('a')[1];
  DOMhelp.addEvent(table.topPrev,'click',pn.navigate,false);  
  DOMhelp.addEvent(table.bottomPrev,'click',pn.navigate,false);  
  DOMhelp.addEvent(table.topNext,'click',pn.navigate,false);  
  DOMhelp.addEvent(table.bottomNext,'click',pn.navigate,false);  
  table.bottomNext.onclick=DOMhelp.safariClickFix;
  table.topPrev.onclick=DOMhelp.safariClickFix;
  table.bottomPrev.onclick=DOMhelp.safariClickFix;
  table.topNext.onclick=DOMhelp.safariClickFix;
  table.topCounter=navBefore.getElementsByTagName('span')[0];
  table.bottomCounter=navAfter.getElementsByTagName('span')[0];
 },
 navigate:function(e){
  var start, table;
  var t=DOMhelp.getTarget(e);
  while(t.nodeName.toLowerCase()!='a'){t=t.parentNode;}
  if(t.getAttribute('href') == null || t.getAttribute('href') == ''){return;}
  if(t.parentNode.previousSibling.nodeName.toLowerCase() == 'table'){
   table=t.parentNode.previousSibling; 
  }else{
   table=t.parentNode.nextSibling; 
  }
  if(t==table.topNext || t==table.bottomNext){
   start=table.current+pn.increase;
  }else if(t==table.topPrev || t==table.bottomPrev){
   start=table.current-pn.increase;
  }
  pn.showSection(table,start)
 },
 showSection:function(table,start){
  var i;
  pn.changePaginationNav(table,start);
  if(table.current!=null){
   for(i=table.current;i<table.current+pn.increase;i++){
    if(table.datarows[i]){
     DOMhelp.cssjs('remove',table.datarows[i],pn.showClass);
    }
   } 
  }
  for(i=start;i<start+pn.increase;i++){
   if(table.datarows[i]){
    DOMhelp.cssjs('add',table.datarows[i],pn.showClass); 
   }
  }
  table.current=start;
 },
 changePaginationNav:function(table,start){
  if(start-pn.increase<0){
   table.bottomPrev.removeAttribute('href');
   table.topPrev.removeAttribute('href');
  }else{
   table.bottomPrev.setAttribute('href','#');
   table.topPrev.setAttribute('href','#');
  }
  if(start+pn.increase>table.datarowsize-2){
   table.bottomNext.removeAttribute('href');
   table.topNext.removeAttribute('href'); 
  }else{
   table.bottomNext.setAttribute('href','#');
   table.topNext.setAttribute('href','#');
  }
  var counter=pn.counter.replace('_x_',start+1);
  var last=start+pn.increase;
  if(last>table.datarowsize){last=table.datarowsize;}
  counter=counter.replace('_y_',last);
  counter=counter.replace('_z_',table.datarowsize);
  table.topCounter.innerHTML=counter;
  table.bottomCounter.innerHTML=counter;
 }
}
DOMhelp.addEvent(window,'load',pn.init,false);
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