1.当然有一个TreeView咯,这里ID名为 treeViewType
<asp:TreeView ID="treeViewType" runat="server" ExpandDepth="1"></asp:TreeView>
2.然后需要两个按钮,其中 TreeviewExpandCollapseAll 为JS方法,后面介绍
<input type="button" value="展开" class="but1" onclick="TreeviewExpandCollapseAll('<%=treeViewType.ClientID%>', true)" />
<input type="button" value="收缩" class="but1" onclick="TreeviewExpandCollapseAll('<%=treeViewType.ClientID%>', false)" />
<input type="button" value="收缩" class="but1" onclick="TreeviewExpandCollapseAll('<%=treeViewType.ClientID%>', false)" />
3.最关键的JS方法来了,嘿嘿
/*
* 树展开收缩方法 2010-03-23 PM By WQY
* treeViewId: 树对象
* expandAll: 展开或收缩
*/
function TreeviewExpandCollapseAll(treeViewId, expandAll) {
var displayState = (expandAll == true ? "none" : "block");
var treeView = document.getElementById(treeViewId);
if (treeView) {
var treeLinks = treeView.getElementsByTagName("a");
var nodeCount = treeLinks.length;
for (i = 0; i < nodeCount; i++) {
if (treeLinks[i].firstChild.tagName) {
if (treeLinks[i].firstChild.tagName.toLowerCase() == "img") {
var currentToggleLink = treeLinks[i];
var childContainer = GetParentByTagName("table", currentToggleLink).nextSibling;
if (childContainer.style.display == displayState) {
eval(currentToggleLink.href);
}
}
}
}
}
}
function GetParentByTagName(parentTagName, childElementObj) {
var parent = childElementObj.parentNode;
while (parent.tagName.toLowerCase() != parentTagName.toLowerCase()) {
parent = parent.parentNode;
}
return parent;
}
* 树展开收缩方法 2010-03-23 PM By WQY
* treeViewId: 树对象
* expandAll: 展开或收缩
*/
function TreeviewExpandCollapseAll(treeViewId, expandAll) {
var displayState = (expandAll == true ? "none" : "block");
var treeView = document.getElementById(treeViewId);
if (treeView) {
var treeLinks = treeView.getElementsByTagName("a");
var nodeCount = treeLinks.length;
for (i = 0; i < nodeCount; i++) {
if (treeLinks[i].firstChild.tagName) {
if (treeLinks[i].firstChild.tagName.toLowerCase() == "img") {
var currentToggleLink = treeLinks[i];
var childContainer = GetParentByTagName("table", currentToggleLink).nextSibling;
if (childContainer.style.display == displayState) {
eval(currentToggleLink.href);
}
}
}
}
}
}
function GetParentByTagName(parentTagName, childElementObj) {
var parent = childElementObj.parentNode;
while (parent.tagName.toLowerCase() != parentTagName.toLowerCase()) {
parent = parent.parentNode;
}
return parent;
}