使用JavaScript展开/折叠TreeView中所有节点
代码如下，国外网站上copy很多，也不知道谁才是原作者，但在.net 3.5下好像有一点毛病，就是图标的问题，不知道如何解决：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="jstree.aspx.cs" Inherits="jstree" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
<script type="text/javascript">
function expandAll(treeViewId)
{
var treeView = document.getElementById(treeViewId);
var treeLinks = treeView.getElementsByTagName("a");
var j = true;
for(i=0;i<treeLinks.length;i++)
{
if(treeLinks[i].firstChild.tagName == "IMG")
{
var node = treeLinks[i];
var level = parseInt(treeLinks[i].id.substr(treeLinks[i].id.length - 1),10);
var childContainer = document.getElementById(treeLinks[i].id + "Nodes");
if(j)
{
if(childContainer.style.display == "none")
TreeView_ToggleNode(eval(treeViewId +"_Data"),level,node,'r',childContainer);
j = false;
}
else
{
if(childContainer.style.display == "none")
TreeView_ToggleNode(eval(treeViewId +"_Data"),level,node,'l',childContainer);
}
}
}
}
function collapseAll(treeViewId)
{
var treeView = document.getElementById(treeViewId);
var treeLinks = treeView.getElementsByTagName("a");
var j = true;
for(i=0;i<treeLinks.length;i++)
{
if(treeLinks[i].firstChild.tagName == "IMG")
{
var node = treeLinks[i];
var level = parseInt(treeLinks[i].id.substr(treeLinks[i].id.length - 1),10);
var childContainer = document.getElementById(treeLinks[i].id + "Nodes");
if(j)
{
if(childContainer.style.display == "block")
TreeView_ToggleNode(eval(treeViewId +"_Data"),level,node,'r',childContainer);
j = false;
}
else
{
if(childContainer.style.display == "block")
TreeView_ToggleNode(eval(treeViewId +"_Data"),level,node,'l',childContainer);
}
}
}
}
function Button1_onclick() {
expandAll('<%=TreeView1.ClientID%>');
}
function Button2_onclick() {
collapseAll('<%=TreeView1.ClientID%>');
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
<asp:TreeView ID="TreeView1" runat="server">
<Nodes>
<asp:TreeNode Text="New Node" Value="New Node">
<asp:TreeNode Text="New Node" Value="New Node">
<asp:TreeNode Text="New Node" Value="New Node">
<asp:TreeNode Text="New Node" Value="New Node"></asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="New Node" Value="New Node"></asp:TreeNode>
<asp:TreeNode Text="New Node" Value="New Node">
<asp:TreeNode Text="New Node" Value="New Node">
<asp:TreeNode Text="New Node" Value="New Node"></asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="New Node" Value="New Node"></asp:TreeNode>
<asp:TreeNode Text="New Node" Value="New Node"></asp:TreeNode>
<asp:TreeNode Text="New Node" Value="New Node">
<asp:TreeNode Text="New Node" Value="New Node"></asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
</Nodes>
</asp:TreeView>
</form>
<p>
<input id="Button1" type="button" value="Expand All" onclick="return Button1_onclick()" /></p>
<p>
<input id="Button2" type="button" value="Collapse All" onclick="return Button2_onclick()" /></p>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
<script type="text/javascript">
function expandAll(treeViewId)
{
var treeView = document.getElementById(treeViewId);
var treeLinks = treeView.getElementsByTagName("a");
var j = true;
for(i=0;i<treeLinks.length;i++)
{
if(treeLinks[i].firstChild.tagName == "IMG")
{
var node = treeLinks[i];
var level = parseInt(treeLinks[i].id.substr(treeLinks[i].id.length - 1),10);
var childContainer = document.getElementById(treeLinks[i].id + "Nodes");
if(j)
{
if(childContainer.style.display == "none")
TreeView_ToggleNode(eval(treeViewId +"_Data"),level,node,'r',childContainer);
j = false;
}
else
{
if(childContainer.style.display == "none")
TreeView_ToggleNode(eval(treeViewId +"_Data"),level,node,'l',childContainer);
}
}
}
}
function collapseAll(treeViewId)
{
var treeView = document.getElementById(treeViewId);
var treeLinks = treeView.getElementsByTagName("a");
var j = true;
for(i=0;i<treeLinks.length;i++)
{
if(treeLinks[i].firstChild.tagName == "IMG")
{
var node = treeLinks[i];
var level = parseInt(treeLinks[i].id.substr(treeLinks[i].id.length - 1),10);
var childContainer = document.getElementById(treeLinks[i].id + "Nodes");
if(j)
{
if(childContainer.style.display == "block")
TreeView_ToggleNode(eval(treeViewId +"_Data"),level,node,'r',childContainer);
j = false;
}
else
{
if(childContainer.style.display == "block")
TreeView_ToggleNode(eval(treeViewId +"_Data"),level,node,'l',childContainer);
}
}
}
}
function Button1_onclick() {
expandAll('<%=TreeView1.ClientID%>');
}
function Button2_onclick() {
collapseAll('<%=TreeView1.ClientID%>');
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
<asp:TreeView ID="TreeView1" runat="server">
<Nodes>
<asp:TreeNode Text="New Node" Value="New Node">
<asp:TreeNode Text="New Node" Value="New Node">
<asp:TreeNode Text="New Node" Value="New Node">
<asp:TreeNode Text="New Node" Value="New Node"></asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="New Node" Value="New Node"></asp:TreeNode>
<asp:TreeNode Text="New Node" Value="New Node">
<asp:TreeNode Text="New Node" Value="New Node">
<asp:TreeNode Text="New Node" Value="New Node"></asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="New Node" Value="New Node"></asp:TreeNode>
<asp:TreeNode Text="New Node" Value="New Node"></asp:TreeNode>
<asp:TreeNode Text="New Node" Value="New Node">
<asp:TreeNode Text="New Node" Value="New Node"></asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
</Nodes>
</asp:TreeView>
</form>
<p>
<input id="Button1" type="button" value="Expand All" onclick="return Button1_onclick()" /></p>
<p>
<input id="Button2" type="button" value="Collapse All" onclick="return Button2_onclick()" /></p>
</body>
</html>
作者：Lance Zhang（Lance Zhang's Tech Blog）
出处：http://blodfox777.cnblogs.com/
本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。
