ASP.NET 程序中常用的三十三种代码

1  选择了父节点,则它的所有子节点都选中
2  只要有一个子节点选中, 其父节点就选中

<script language="javascript" type="text/javascript">
function HandleCheckbox()                                          
{                                                                             
    var element = event.srcElement;                                           
    if (element.tagName == "INPUT" && element.type == "checkbox")             
    {                                                                         
        var checkedState = element.checked;                                  
        while (element.tagName != "TABLE") // Get wrapping table              
        {                                                                     
            element = element.parentElement;                                  
        }                                                                           
        var parentElement = element;
                   
        if(checkedState)
        {
         CheckParents(element);
        }
                                                                                    
        element = element.nextSibling; //element.tagName = DIV 
                                                                              
        if (element != null) // If no childrens then exit
        {                                                                                                    
            var childTables = element.getElementsByTagName("TABLE");
           
            for (var tableIndex = 0; tableIndex < childTables.length; tableIndex++)
            {                                                                     
                CheckTable(childTables[tableIndex], checkedState);     
            }
        }
        if(checkedState == false)
        {
            UnCheckParents(parentElement);
        }           
                                                           
    }                                                                         
}                                                                             
                                                                              
// Uncheck the parents of the given table, Can remove the recurse (redundant) 
function CheckParents(table)                                     
{                                                                             
    if (table == null || table.rows[0].cells.length == 2) // This is the root 
    {                                                                         
        return;                                                               
    }                                                                         
    var parentTable = table.parentElement.previousSibling;
    CheckTable(parentTable, true);                                
    CheckParents(parentTable);                                   
} 

// Check the parents of the given table, Can remove the recurse (redundant) 
function UnCheckParents(table)                                     
{      
                                                                    
    if (table == null || table.rows[0].cells.length == 2) // This is the root 
    {                                                                         
        return;                                                               
    }                                                                    
    var parentTable = table.parentElement.previousSibling;
  
    var checkedCount  =GetCheckedCount(table.parentElement);
    if(checkedCount == 0)
    {
        CheckTable(parentTable, false);
    }                                                
    UnCheckParents(parentTable);                                   
}                                                                             
                                                                              
// Handle the set of checkbox checked state                                   
function CheckTable(table, checked) 
    {                                                                             
    var checkboxIndex = table.rows[0].cells.length - 1;   
    var cell = table.rows[0].cells[checkboxIndex];  
    var checkboxes = cell.getElementsByTagName("INPUT"); 
    if (checkboxes.length == 1) 
    {                                                                         
        checkboxes[0].checked = checked; 
    }
                                                                          
} 
//Get checked children count
function GetCheckedCount(table)
{
    var checkedCount = 0;
    var element = table.nextSibling;
    var childTable = table.getElementsByTagName("TABLE");
   
    for(var tableIndex = 0;tableIndex < childTable.length; tableIndex++)
    {
        var childTables = childTable[tableIndex];
        var checkboxIndex = childTables.rows[0].cells.length - 1;    
        var cell = childTables.rows[0].cells[checkboxIndex];  
        var checkboxes = cell.getElementsByTagName("INPUT");
        if (checkboxes.length == 1 && checkboxes[0].checked == true)
        {                                                                         
             checkedCount++;            
        }     
    }  
    return  checkedCount;   
}                                                                            
 </script>

<asp:TreeView ID="TreeViewModules" runat="server" ShowCheckBoxes="All" onclick="HandleCheckbox();"
        ShowLines="True" ExpandDepth="1" meta:resourcekey="TreeViewModulesResource1">

</asp:TreeView>