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最近在論壇上回答了一些關于客戶端操作TreeView節點選中的問題，在網友提供的代碼基礎上做了兩個例子。可惜原貼已經丟失了，整理一下寫成文檔吧
為了書寫方便，這兩個例子沒有采用codebehind方式，復制即可運行
第一個例子是當取消或選中節點選中狀態時，子節點也做相應的取消或選中變化
需要注意的是如果要初始設置TreeNode為選中狀態，只能在客戶端設置。如果在服務器端設置TreeNode為選中狀態，則在客戶端使用getAttribute("Checked")，得到的值永遠是true。
<%@ Register TagPrefix="iewc" Namespace="Microsoft.Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls, Version=1.0.2.226, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>
<HTML>
?<HEAD>
??<script language="C#" runat="server">
???private void Page_Load(object sender, System.EventArgs e)
???{???
????TreeView1.Attributes.Add("oncheck","tree_oncheck(this)");
???}
??</script>
??<script language="javascript">
<!--
//初始化選中節點
function initchecknode()
{
?var node=TreeView1.getTreeNode("1");
?node.setAttribute("Checked","true");
?setcheck(node,"true");?
?FindCheckedFromNode(TreeView1);
}
//oncheck事件
function tree_oncheck(tree)
{
?var node=tree.getTreeNode(tree.clickedNodeIndex);
?var Pchecked=tree.getTreeNode(tree.clickedNodeIndex).getAttribute("checked");
?setcheck(node,Pchecked);
?document.all.checked.value="";
?document.all.unchecked.value="";
?FindCheckedFromNode(TreeView1);
}
//設置子節點選中
function setcheck(node,Pc)
{
?var i;
?var ChildNode=new Array();
?ChildNode=node.getChildren();
?
?if(parseInt(ChildNode.length)==0)
??return;
?else
?{
??for(i=0;i<ChildNode.length;i++)
??{
???var cNode;
???cNode=ChildNode[i];
???if(parseInt(cNode.getChildren().length)!=0)
????setcheck(cNode,Pc);
???cNode.setAttribute("Checked",Pc);
??}
?}
}
//獲取所有節點狀態
function FindCheckedFromNode(node) {
?var i = 0;
?var nodes = new Array();
?nodes = node.getChildren();
?
?for (i = 0; i < nodes.length; i++) {
??var cNode;
??cNode=nodes[i];
??if (cNode.getAttribute("Checked"))
???AddChecked(cNode);
??else
????? AddUnChecked(cNode);
??
??if (parseInt(cNode.getChildren().length) != 0 ) {
???FindCheckedFromNode(cNode);
??}
?}
}
//添加選中節點
function AddChecked(node) {
?document.all.checked.value += node.getAttribute("NodeData");
?document.all.checked.value += ',';
}
//添加未選中節點
function AddUnChecked(node) {
?document.all.unchecked.value += node.getAttribute("NodeData");
?document.all.unchecked.value += ',';
}
//-->
??</script>
?</HEAD>
?<body onload="initchecknode()">
??<iewc:TreeView id="TreeView1" runat="server" ExpandLevel="5">
???<iewc:TreeNode NodeData="0" CheckBox="True" Text="Node0" Expanded="True">
????<iewc:TreeNode NodeData="1" CheckBox="True" Text="Node1" Expanded="True"></iewc:TreeNode>
????<iewc:TreeNode NodeData="2" CheckBox="True" Text="Node2" Expanded="True">
?????<iewc:TreeNode NodeData="3" CheckBox="True" Text="Node3" Expanded="True">
??????<iewc:TreeNode NodeData="4" CheckBox="True" Text="Node4"
Expanded="True"></iewc:TreeNode>
?????</iewc:TreeNode>
????</iewc:TreeNode>
???</iewc:TreeNode>
???<iewc:TreeNode NodeData="5" CheckBox="True" Text="Node5" Expanded="True">
????<iewc:TreeNode NodeData="6" CheckBox="True" Text="Node6" Expanded="True"></iewc:TreeNode>
???</iewc:TreeNode>
???<iewc:TreeNode NodeData="7" CheckBox="True" Text="Node7" Expanded="True">
????<iewc:TreeNode NodeData="8" CheckBox="True" Text="Node8" Expanded="True">
?????<iewc:TreeNode NodeData="9" CheckBox="True" Text="Node9"
Expanded="True"></iewc:TreeNode>
????</iewc:TreeNode>
???</iewc:TreeNode>
??</iewc:TreeView><P>
???<TABLE id="Table1" cellSpacing="1" cellPadding="1" width="300" border="1">
????<TR>
?????<TD>
??????<asp:Label id="Label1" runat="server">checked</asp:Label></TD>
?????<TD>
??????<INPUT id="checked" type="text" size="32"></TD>
????</TR>
????<TR>
?????<TD>
??????<asp:Label id="Label2" runat="server">unchecked</asp:Label></TD>
?????<TD><INPUT id="unchecked" type="text" size="32"></TD>
????</TR>
???</TABLE>
???<br>
??</P>
?</body>
</HTML>
?
第二個例子是關于如何在服務器端得到客戶端設置后的節點選中狀態
<%@ Register TagPrefix="iewc" Namespace="Microsoft.Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls,
Version=1.0.2.226, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>
<HTML>
?<HEAD>
??<script language="C#" runat="server">
???private void Button1_Click(object sender, System.EventArgs e)
???{
????Response.Write(TreeView1.Nodes[0].Checked);
???}
??</script>
??<script language="javascript">
???function set_check()
???{
????var nodeindex = "0";
????var node=TreeView1.getTreeNode(nodeindex);
????node.setAttribute("Checked","True");
????TreeView1.queueEvent('oncheck', nodeindex);
???}
??</script>
?</HEAD>
?<body>
??<form id="TestTree" method="post" runat="server">
???<iewc:TreeView id="TreeView1" runat="server">
????<iewc:TreeNode CheckBox="True" Text="Node0"></iewc:TreeNode>
???</iewc:TreeView>
???<br>
???<input type="button" value="set check" onclick="set_check()">
???<br>
???<asp:Button id="Button1" runat="server" Text="submit" OnClick="Button1_Click"></asp:Button>
??</form>
?</body>
</HTML>
posted on 2006-12-12 00:05
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