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<script language="javascript">
//-----------------------------------------------------------------------------
function $(s){return document.getElementById(s);}
function isNull(_sVal){return (_sVal == "" || _sVal == null || _sVal == "undefined");}

function TreeviewExpandCollapseAll(treeViewId, expandAll)
{
    var displayState = (expandAll == true ? "none" : "block");
    var treeView = $(treeViewId);
    if(treeView)
    {
        var treeLinks = treeView.getElementsByTagName("a");
        var nodeCount = treeLinks.length;
        var flag = true;
        for(i=0;i<nodeCount;i++)
        {
            if(treeLinks[i].firstChild.tagName)
            {
                if(treeLinks[i].firstChild.tagName.toLowerCase() == "img")
                {
                    var node = treeLinks[i];
                    var level = parseInt(node.id.substr(node.id.length - 1),10);
                    var childContainer = GetParentByTagName("table", node).nextSibling;
                    if(!isNull(childContainer))
                    {
                        if(flag)
                        {
                            if(childContainer.style.display == displayState)
                            {
                                TreeView_ToggleNode(eval(treeViewId +"_Data"),level,node,'r',childContainer);
                            }
                            flag = false;
                        }
                        else
                        {
                            if(childContainer.style.display == displayState)
                            {
                                TreeView_ToggleNode(eval(treeViewId +"_Data"),level,node,'l',childContainer);
                            }
                        }
                    }
                }
            }
        }//for loop ends
    }
}

function GetParentByTagName(parentTagName, childElementObj)
{
    var parent = childElementObj.parentNode;
    while(parent.tagName.toLowerCase() != parentTagName.toLowerCase())
    {
        parent = parent.parentNode;
    }
    return parent;
}
//-----------------------------------------------------------------------------
</script>

<script language="javascript">
//2. 只打開一個節(jié)點,關(guān)閉其他兄弟節(jié)點(Just one expanded node, all other will collaps)
function TreeView_ToggleNode(data, index, node, lineType, children)
{
    var img = node.childNodes[0];
    var newExpandState;
    try {
        //***折疊兄弟節(jié)點(Collapse Brothers)-----
        CollapseBrothers(data,children);
        //---------------------------------------
           
        if (children.style.display == "none")
        {
            children.style.display = "block";
            newExpandState = "e";
            if ((typeof(img) != "undefined") && (img != null))
            {
                if (lineType == "l")
                {
                    img.src = data.images[15];
                }
                else if (lineType == "t")
                {
                    img.src = data.images[12];
                }
                else if (lineType == "-")
                {
                    img.src = data.images[18];
                }
                else
                {
                    img.src = data.images[5];
                }
                img.alt = data.collapseToolTip.replace(/\{0\}/, TreeView_GetNodeText(node));
            }
        }
        else
        {
            children.style.display = "none";
            newExpandState = "c";
            if ((typeof(img) != "undefined") && (img != null))
            {
                if (lineType == "l")
                {
                    img.src = data.images[14];
                }
                else if (lineType == "t")
                {
                    img.src = data.images[11];
                }
                else if (lineType == "-")
                {
                    img.src = data.images[17];
                }
                else
                {
                    img.src = data.images[4];
                }
                img.alt = data.expandToolTip.replace(/\{0\}/, TreeView_GetNodeText(node));
            }
        }
    }
    catch(e) {}
    data.expandState.value = data.expandState.value.substring(0, index) + newExpandState + data.expandState.value.slice(index + 1);
}

//折疊兄弟節(jié)點(Collapse Brothers)
function CollapseBrothers(data,childContainer)
{
    var parent = childContainer.parentNode;  
    for(i=0; i< parent.childNodes.length; i++)
    {
        if(parent.childNodes[i].tagName.toLowerCase() =="div")
        {
            if(parent.childNodes[i].id != childContainer.id)
            {
                parent.childNodes[i].style.display = "none"
            }
        }
        else if(parent.childNodes[i].tagName.toLowerCase() =="table")
        {
            var treeLinks = parent.childNodes[i].getElementsByTagName("a");           
            if(treeLinks.length > 2)
            {
                var j=0;
                if(treeLinks[j].firstChild.tagName)
                {
                    if(treeLinks[j].firstChild.tagName.toLowerCase() == "img")
                    {
                        var img = treeLinks[j].firstChild;
                        if(i==0)
                            img.src = data.images[8];
                        else if(i==parent.childNodes.length-2)
                            img.src = data.images[14];
                        else
                            img.src = data.images[11];
                    }
                }   
            }
        }       
    }
}
//-----------------------------------------------------------------------------
</script>

注意這句話：所謂的重寫就是在原來的函數(shù)之后添加一個同名函數(shù)（因為js對于同名函數(shù)只調(diào)用最后一個）。

所以上面的script放在aspx文件的最后引用！