javascript常用函数

Code
 //改变排序方式（asc<-->desc）
function chgSortOrder(lastOrder){
    var newOrder = "";
    if(lastOrder != ""){  
        if(lastOrder=="asc"){
            newOrder = "desc";
        }else if(lastOrder=="desc"){
            newOrder = "asc";
        }
    }else{ //first time order is asc(default)
        newOrder = "asc";
    }
    return newOrder;
}


//检查字符的长度,按汉字的长度计算
function ChineseLenLimit( str, maxLen){
     var Strs = str;
     var strlength=0;
     var i;
     for ( i=0;i<str.length;i++) {
            if(str.charCodeAt(i)>=1000)
                    strlength += 2;
            else
                    strlength += 1;
     }
     if ( strlength > maxLen ){
         return false;
     }
     return true;
}

function isEmail(theStr){
    var atIndex = theStr.indexOf('@');
    var dotIndex = theStr.indexOf('.',atIndex);
    var flag = true;
    var theSub = theStr.substring(0,dotIndex+1);
    if((atIndex < 1)||(atIndex != theStr.lastIndexOf('@'))||(dotIndex < atIndex + 2)||(theStr.length <= theSub.length))
    { flag = false;    }
    else    { flag =true;    }
    return(flag);
}
function openwindow(url,name,iWidth,iHeight)
 {
  var url;                                 //转向网页的地址;
  var name;                           //网页名称，可为空;
  var iWidth;                          //弹出窗口的宽度;
  var iHeight;                        //弹出窗口的高度;
  var iTop = (window.screen.availHeight-30-iHeight)/2;       //获得窗口的垂直位置;
  var iLeft = (window.screen.availWidth-10-iWidth)/2;           //获得窗口的水平位置;
 window.open(url,name,'height='+iHeight+',,innerHeight='+iHeight+',width='+iWidth+',innerWidth='+iWidth+',top='+iTop+',left='+iLeft+',toolbar=no,menubar=no,scrollbars=auto,resizeable=yes,location=no,status=yes');
  //window.open(url,name,'height='+iHeight+',width='+iWidth+',top='+iTop+',left='+iLeft+',toolbar=no,menubar=no,scrollbars=yes,resizeable=yes,location=no,status=yes');
 }
  
        function ___doPostBack(eventTarget, eventArgument) 
        { 
        var theform = document.forms['form1']; 
        if (!theform) 
        { 
        theform = document.form1; 
        } 
        theform.__EVENTTARGET.value = eventTarget ;
        theform.__EVENTARGUMENT.value = eventArgument; 
        theform.submit();
        }
   function openWindows(url, width, heigth)    
   {
        res=window.showModalDialog(url,window,"status:false;resizable:yes;dialogWidth:"+width+"px;dialogHeight:"+heigth+"px");
        ___doPostBack('Form1',res);
   }
   function SelectCheck(btn,gv)
   {
      var shouldSelect;
      if(btn.tag == 0)
      {
        btn.value = "  反选";
        btn.tag = 1;
        shouldSelect = true;
       }
       else
       {
            btn.value = "  全选";
            btn.tag = 0;
            shouldSelect = false;
       }
       var TargetChildControl = "chkBox1";
       var Inputs = gv.getElementsByTagName("INPUT");
       for(var n = 0; n < Inputs.length; ++n)
       {
          if(Inputs[n].type == 'checkbox' && Inputs[n].id.indexOf(TargetChildControl,0) >= 0)
          {
               Inputs[n].checked=shouldSelect;
          }
       }
   }
   function CheckBox(gv,TargetChildControl)
   {
       var Inputs = gv.getElementsByTagName("INPUT");
       for(var n = 0; n < Inputs.length; ++n)
       {
          if(Inputs[n].type == 'checkbox' && Inputs[n].id.indexOf(TargetChildControl,0) >= 0&&Inputs[n].checked==true)
          {
               return confirm('是否删除？');
               break;
          }
       }
       alert("请至少选择一项");    
       return false;
       
   }
   //treeview的单击事件
  function GoClick()
  {
    
   var obj = event.srcElement;
   if(obj.tagName.toUpperCase() != "INPUT") return;
   var tb = obj.parentElement.parentElement.parentElement.parentElement;//当前节点的Table
  
   SelAllChildren(tb,obj.checked);
  
   tb=  tb.parentElement;//
   
   while(true)
   {
      tb = tb.previousSibling 
     if( tb == null) return; 
      SetParentCheckBoxStatus(tb);
      tb=  tb.parentElement
      if( tb == null) return; 
   }
    
 }
 
 function SelAllChildren(tb,checked)
 {
    var div = tb.nextSibling;
   try
   {
    for(var i=0;i<div.children.length;i++)
    {
       
        if(div.children[i].tagName.toUpperCase()!="TABLE")continue;
        var chkBox= FindRowCheckBox(div.children[i].rows[0]);
        if(chkBox == null) continue;
        chkBox.checked = checked;
        
        SelAllChildren(div.children[i],checked);
        
    }
    }catch(e){}
 }
 function SetParentCheckBoxStatus(objTb)
 {
    var div = objTb.nextSibling;
     
    var bSelAll = true;
    var bSelOne = false;
    for(var i=0;i<div.children.length;i++)
    {
        
        if(div.children[i].tagName.toUpperCase()!="TABLE")continue;
        
        var chkBox= FindRowCheckBox(div.children[i].rows[0]);
        
        if(!chkBox.checked)
        {
            bSelAll =false;
        }else
        {
            bSelOne = true;
        }
    } 
    
    if(objTb.rows!= null)
    {
        var chkBox = FindRowCheckBox(objTb.rows[0])
        chkBox.checked  = bSelOne;
        
    } 
 }
 
 function FindRowCheckBox(tr)
 {
    for(var i=0;i<tr.cells.length;i++)
    {
        if(tr.cells[i].firstChild.tagName == "INPUT")
        {
            return tr.cells[i].firstChild;
        }
    }
 }
 //结束
   

转载于:https://www.cnblogs.com/hubcarl/archive/2009/04/11/1433635.html