A.net 2.0的TreeView客户端个性化控制.(1)_.NET概论及软件使用_黑客防线网安服务器维护基地--Powered by WWW.RONGSEN.COM.CN

A.net 2.0的TreeView客户端个性化控制.(1)

作者:黑客防线网安ASP维护基地 来源:黑客防线网安ASP维护基地 浏览次数:0

本篇关键词:个性化控制客户端 
黑客防线网安网讯:  Asp.net 2.0 的 TreeView 控件功能虽说强大,但其客户端控制很逊色,本文将讲解 TreeView 的客户端实现原理,并实现两个个性化操作:  (1) 节点的全部打开和关闭;  TreeNode Expand(or...

  Asp.net 2.0 的 TreeView 控件功能虽说强大,但其客户端控制很逊色,本文将讲解 TreeView 的客户端实现原理,并实现两个个性化操作:

  (1) 节点的全部打开和关闭;

  TreeNode Expand(or Collapse) all

  (2) 只打开一个节点(关闭其他兄弟节点)

  just one node expanded(when a client expand one node all other will collaps)

  用记事本打开页面源代码可以找到一下两个脚本引用:

<script src="/WebUI/WebResource.axd?d=RAQeBcDUNuP9iuS8q3tNEw2&amp;t=633300220640000000" type="text/javascript"></script>
<script src="/WebUI/WebResource.axd?d=JuTdJhq3NM8Jq_RhssAkEg2&amp;t=633300220640000000" type="text/javascript"></script>

  将"/WebUI/WebResource.axd?d=RAQeBcDUNuP9iuS8q3tNEw2&t=633300220640000000"拷到地址栏尾下载脚本,并以 .js 命名,另一个同样操作分析第二个脚本文件,可以看到TreeView的很多客户端函数,其中关键的一个 TreeView_ToggleNode 就是客户端点击时触发的事件。

  要想做个性化的操作,就得从 TreeView_ToggleNode 事件下手。我们无法更改.net封装好的脚本,只有“重写”。所谓的重写就是在原来的函数之后添加一个同名函数(因为js对于同名函数只调用最后一个)。

  TreeView_ToggleNode 的原函数:

  function TreeView_ToggleNode(data, index, node, lineType, children) {
  var img = node.childNodes[0];
  var newExpandState;
  try {
  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);
  }

  1. 节点的全部打开和关闭:

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>LeftMenu_Tree</title>
</head>
<body bgcolor="#DDEDFD">
    <form id="form1" runat="server">
        <a href="javascript:TreeviewExpandCollapseAll('<%=TreeView1.ClientID%>', true)">Expand
            All</a> <a href="javascript:TreeviewExpandCollapseAll('<%=TreeView1.ClientID%>', false)">
                Collapse All</a>
        <asp:TreeView ID="TreeView1" SkinID="tvClass" runat="server" ShowLines="true" NodeWrap="false">
        </asp:TreeView>
    </form>
</body>
</html>

<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>

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