//页面显示出来了，下面的任务就是对它们进行操作了。以下都是前台javascript函数。第一步，首先在window.onload事件中根据数组acategory来生成选择框selcategory的option值。

  function on_load()
      {
      
        //初始化
        frmmanager.btnchangemaster .disabled      = true ;
        frmmanager.btnchangename .disabled        = true ;
        frmmanager.btndeletecategory .disabled    = true ;
        frmmanager.btndown .disabled              = true ;
        frmmanager.btnmodifydescription .disabled = true ;
        frmmanager.btnup .disabled                = true ;
        frmmanager.btnaddforum .disabled          = true ;
        frmmanager.btndeleteforum .disabled       = true ;
        
        //首先生成selcategory的option

        frmmanager.selcategoryname.options.length = 0;
        for (var i = 0 ; i < acategory.length ; i++)
           {
             var newoption = document.createelement("option") ;
             newoption.value = acategory[i].categoryid ;
             newoption.text = acategory[i].categoryname;
             frmmanager.selcategoryname .add (newoption , i) ;
            }
            
      }

//第二步，我们利用selcategory的onchange事件来实现selforum的显示，利用selform的onchange事件来实现它们相关信息的显示。

  function on_categorychange()
    {

        frmmanager.btnchangename .disabled        = false ;
        frmmanager.btndeletecategory .disabled    = false ;
        frmmanager.btndown .disabled              = false ;
        frmmanager.btnup .disabled                = false ;
        frmmanager.btnaddforum .disabled          = false ;
        frmmanager.btnmodifydescription .disabled = true ;
        frmmanager.btnchangemaster .disabled      = true ;
        frmmanager.btnaddcategory .disabled       = false ;
        frmmanager.btndeleteforum .disabled       = true ;
        


        frmmanager.selforumname.options.length = 0 ;
        if (frmmanager.selcategoryname .selectedindex != -1)
          {
            frmmanager.txtcategoryname.value = frmmanager.selcategoryname[frmmanager.selcategoryname.selectedindex].text ;
          }  
        frmmanager.txtforumname.value = ""
        frmmanager.txtdescription .value = ""
        for (var i = 0 ; i < aforum.length ; i ++)
           {
             if (aforum[i].rootcategoryid == frmmanager.selcategoryname.value)
               {
                 var newoption = document.createelement("option") ;
                 newoption.value = aforum[i].categoryid ;
                 newoption.text = aforum[i].categoryname
                 frmmanager.selforumname .add (newoption , i) ;
               }
           }
    }
  function on_forumchange()
    {

        frmmanager.btnchangemaster .disabled      = false ;
        frmmanager.btnchangename .disabled        = false ;
        frmmanager.btndeletecategory .disabled    = true ;
        frmmanager.btnaddcategory .disabled       = true ;
        frmmanager.btndown .disabled              = false ;
        frmmanager.btnmodifydescription .disabled = false ;
        frmmanager.btnup .disabled                = false ;
        frmmanager.btnaddforum .disabled          = false ;
        frmmanager.btndeleteforum .disabled       = false ;


        var intforumindex ;
        for (var i = 0 ; i < aforum.length ; i ++)
           {
             if (frmmanager.selforumname[frmmanager.selforumname.selectedindex].value == aforum[i].categoryid )
               {
                 intforumindex = i ;
                 break ;
               }  
           }    
        var intmasterindex ;
        for (var i = 0 ; i < frmmanager.selmaster .options.length ; i ++)
           {
             if (frmmanager.selmaster .options [i].value == aforum[intforumindex].masterid)
               {
                 intmasterindex = i ;
                 break ;
               }
           }
        //alert(intmasterindex);   
        frmmanager.selmaster .value = frmmanager.selmaster .options [intmasterindex].value ;   
        frmmanager.selmaster .text = frmmanager.selmaster .options [intmasterindex].text ;   
                 
        frmmanager.txtforumname.value = frmmanager.selforumname[frmmanager.selforumname.selectedindex].text ;
        frmmanager.txtdescription.value = aforum[intforumindex].description ;
        frmmanager.txtdescription.disabled = true ;
    }
    
//第三步，实现对栏目及相关论坛的改名操作

  function on_changename()
    {
     if (frmmanager.btnchangename.value == "修改名称")
        {
          frmmanager.btnchangename.value= "确定"
          frmmanager.selcategoryname.disabled = true
          frmmanager.selforumname.disabled = true
          frmmanager.txtcategoryname.disabled = false
          frmmanager.txtforumname.disabled = false
          
          frmmanager.btnchangemaster .disabled      = true ;
          frmmanager.btndeletecategory .disabled    = true ;
          frmmanager.btndown .disabled              = true ;
          frmmanager.btnmodifydescription .disabled = true ;
          frmmanager.btnup .disabled                = true ;
          frmmanager.btnaddforum .disabled          = true ;
          frmmanager.btndeleteforum .disabled       = true ;
          frmmanager.btnaddcategory .disabled       = true ;
          frmmanager.btnsubmit .disabled            = true ;


        }
     else
        {
        
          frmmanager.btnsubmit .disabled = false ;
        
          frmmanager.btnchangename.value= "修改名称"
          var categoryindex = frmmanager.selcategoryname.selectedindex ;
          var forumindex = frmmanager.selforumname.selectedindex ;
          for (var i = 0 ; i < acategory.length ; i ++)
              {
                if (acategory[i].categoryid == frmmanager.selcategoryname[categoryindex].value)
                   {
                    acategory[i].categoryname = frmmanager.txtcategoryname.value
                   }
               }
          if (forumindex != -1)
             {
               for (var i = 0 ; i < aforum.length ; i ++)
                  {
                     if (aforum[i].categoryid == frmmanager.selforumname[forumindex].value)
                       {
                         aforum[i].categoryname = frmmanager.txtforumname.value
                       }
                   }
             }
           on_load();
           frmmanager.selcategoryname.selectedindex = categoryindex ;
           on_categorychange();
          frmmanager.selcategoryname.disabled = false
          frmmanager.selforumname.disabled = false
          frmmanager.txtcategoryname.disabled = true
          frmmanager.txtforumname.disabled = true
          
        }
    }

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