上一讲中，我们学习了如何使用zTree对一棵大树（大数据量的树型结构的数据表，呵呵，名称有点绕，但说的是事实）进行异步加载，今天这讲，我们来说说，如何去操作这棵大树，无非就是添加子节点，删除节点，编辑节点，节点之间的拖拽，节点位置的变化（排序）等等。
事实上，jquery.ZTree的demo已经把前台JS代码给的很清晰了，我们只要稍加修改，然后把后台CS代码写好就可以了，我将demo的前台代码做了简单的处理，减化了些代码，项目架构使用microsoft mvc 3.0
前台HTML代码如下：
<link href="../../Scripts/JQuery-zTree/css/zTreeStyle/zTreeStyle.css" rel="stylesheet" />
<script src="../../Scripts/JQuery-zTree/js/jquery-1.4.4.min.js"></script>
<script src="../../Scripts/JQuery-zTree/js/jquery.ztree.all-3.5.min.js"></script>
<style type="text/css">
.ztree li span.button.add { margin-left: 2px; margin-right: -1px; background-position: -144px 0; vertical-align: top; *vertical-align: middle; }
a { text-decoration: underline; }
</style>
<script type="text/javascript">
/*
动态数据测试部分开始 */
var log, className = "dark";
var treeID = "treeDemo";
var curDragNodes, autoExpandNode;
var newCount = 1; //异步加载节点
var setting4 = {
data: {
simpleData: {
enable: true,
idKey: "id",
pIdKey: "pId",
rootPId: null
}
},
edit: {
enable: true,
editNameSelectAll: true,
showRemoveBtn: showRemoveBtn,
showRenameBtn: showRenameBtn,
removeTitle: "删除",
renameTitle: "编辑",
drag: {
autoExpandTrigger: true,
prev: dropPrev,
inner: dropInner,
next: dropNext
}
},
view: {
addHoverDom: addHoverDom,
removeHoverDom: removeHoverDom,
selectedMulti: false
},
async: {
//异步加载
enable: true,
url: "/ZTree/AsyncGetNodes",
autoParam: ["id", "name", "pId"]
},
callback: {
/*节点获取与展开回调*/
beforeExpand: beforeExpand,
onAsyncSuccess: onAsyncSuccess,
onAsyncError: onAsyncError,
/*编辑与删除回调*/
beforeEditName: beforeEditName,
beforeRemove: beforeRemove,
beforeRename: beforeRename,
onRemove: onRemove,
onRename: onRename,
/*拖动回调*/
beforeDrag: beforeDrag,
beforeDrop: beforeDrop,
beforeDragOpen: beforeDragOpen,
onDrag: onDrag,
onDrop: onDrop,
onExpand: onExpand
}
};
function beforeEditName(treeId, treeNode) {
className = (className === "dark" ? "" : "dark");
var zTree = $.fn.zTree.getZTreeObj(treeID);
zTree.selectNode(treeNode);
return confirm("进入节点 -- " + treeNode.name + " 的编辑状态吗？");
}
function beforeRemove(treeId, treeNode) {
className = (className === "dark" ? "" : "dark");
var zTree = $.fn.zTree.getZTreeObj(treeID);
zTree.selectNode(treeNode);
return confirm("确认删除 节点 -- " + treeNode.name + " 吗？");
}
function beforeRename(treeId, treeNode, newName, isCancel) {
className = (className === "dark" ? "" : "dark");
if (newName.length == 0) {
alert("节点名称不能为空.");
var zTree = $.fn.zTree.getZTreeObj(treeID);
setTimeout(function () { zTree.editName(treeNode) }, 10);
return false;
}
return true;
}
function onRemove(e, treeId, treeNode) {
$.ajax({
url: '/ZTree/AsyncDelNodes', //url action是方法的名称
data: { id: treeNode.id },
type: 'POST',
success: function (data) {
alert(data);
}
}); }
function onRename(e, treeId, treeNode, isCancel) {
alert("编辑了节点" + treeNode.id + " " + treeNode.name);
$.ajax({
url: '/ZTree/AsyncEditNodes', //url action是方法的名称
data: { id: treeNode.id, name: treeNode.name },
type: 'POST',
success: function (data) {
alert(data);
}
}); }
function showRemoveBtn(treeId, treeNode) {
//return !treeNode.isFirstNode;
return true;
}
function showRenameBtn(treeId, treeNode) {
// return treeNode.isLastNode;
return true;
}
function addHoverDom(treeId, treeNode) {
var sObj = $("#" + treeNode.tId + "_span");
if (treeNode.editNameFlag || $("#addBtn_" + treeNode.tId).length > 0) return;
var addStr = "<span class='button add' id='addBtn_" + treeNode.tId
+ "' title='add node' onfocus='this.blur();'></span>";
sObj.after(addStr);
var btn = $("#addBtn_" + treeNode.tId);
if (btn) btn.bind("click", function () {
var zTree = $.fn.zTree.getZTreeObj(treeID);
zTree.addNodes(treeNode, {
id: (100 + newCount), pId: treeNode.id, name: "new node" + newCount
});
$.ajax({
url: '/ZTree/AsyncAddNodes', //url action是方法的名称
data: { id: (100 + newCount), pid: treeNode.id, name: "new node" + newCount },
type: 'POST',
success: function (data) {
//异常完成后，刷新父节点及下面所有子节点
zTree.reAsyncChildNodes(treeNode, "refresh");
}
});
newCount++;
return false;
});
};
function removeHoverDom(treeId, treeNode) {
$("#addBtn_" + treeNode.tId).unbind().remove();
};
function createTree() {
$.ajax({
url: '/ZTree/AsyncGetNodes', //url action是方法的名称
data: { id: 0 },
type: 'Get',
dataType: "text", //可以是text，如果用text，返回的结果为字符串；如果需要json格式的，可是设置为json
success: function (data) {
$.fn.zTree.init($("#" + treeID), setting4, eval('(' + data + ')'));
},
error: function (msg) {
alert(" 数据加载失败！" + msg);
}
});
}
function beforeExpand(treeId, treeNode) {
if (!treeNode.isAjaxing) {
return true;
} else {
alert("zTree 正在下载数据中，请稍后展开节点。。。");
return false;
}
}
function onAsyncSuccess(event, treeId, treeNode, msg) { }
function onAsyncError() {
alert(" 数据加载失败");
}
$(document).ready(function () {
createTree();
}); function dropPrev(treeId, nodes, targetNode) { var pNode = targetNode.getParentNode();
if (pNode && pNode.dropInner === false) {
return false;
} else {
for (var i = 0, l = curDragNodes.length; i < l; i++) {
var curPNode = curDragNodes[i].getParentNode();
if (curPNode && curPNode !== targetNode.getParentNode() && curPNode.childOuter === false) {
return false;
}
}
}
return true;
}
function dropInner(treeId, nodes, targetNode) { if (targetNode && targetNode.dropInner === false) {
return false;
} else {
for (var i = 0, l = curDragNodes.length; i < l; i++) {
if (!targetNode && curDragNodes[i].dropRoot === false) {
return false;
} else if (curDragNodes[i].parentTId && curDragNodes[i].getParentNode() !== targetNode && curDragNodes[i].getParentNode().childOuter === false) {
return false;
}
}
}
return true;
}
function dropNext(treeId, nodes, targetNode) { var pNode = targetNode.getParentNode();
if (pNode && pNode.dropInner === false) {
return false;
} else {
for (var i = 0, l = curDragNodes.length; i < l; i++) {
var curPNode = curDragNodes[i].getParentNode();
if (curPNode && curPNode !== targetNode.getParentNode() && curPNode.childOuter === false) {
return false;
}
}
}
return true;
}
function beforeDrag(treeId, treeNodes) {
className = (className === "dark" ? "" : "dark");
for (var i = 0, l = treeNodes.length; i < l; i++) {
if (treeNodes[i].drag === false) {
curDragNodes = null;
return false;
} else if (treeNodes[i].parentTId && treeNodes[i].getParentNode().childDrag === false) {
curDragNodes = null;
return false;
}
}
curDragNodes = treeNodes;
return true;
}
function beforeDragOpen(treeId, treeNode) {
autoExpandNode = treeNode;
return true;
}
function beforeDrop(treeId, treeNodes, targetNode, moveType, isCopy) {
className = (className === "dark" ? "" : "dark");
return true;
}
function onDrag(event, treeId, treeNodes) {
className = (className === "dark" ? "" : "dark");
}
function onDrop(event, treeId, treeNodes, targetNode, moveType, isCopy) {
className = (className === "dark" ? "" : "dark");
$.ajax({
url: '/ZTree/AsyncDragNodes', // url action是方法的名称
data: { id: treeNodes[0].id, pid: targetNode.id, name: treeNodes[0].name, moveType: moveType, isCopy: isCopy },
type: 'POST',
success: function (data) {
}
}); }
function onExpand(event, treeId, treeNode) {
if (treeNode === autoExpandNode) {
className = (className === "dark" ? "" : "dark");
}
}
</script> <div class="zTreeDemoBackground left">
<ul id="treeDemo" class="ztree"></ul>
</div>
面各种JS事件，所对应的MVC代码如下：
#region 对节点的操作
/// <summary>
/// 得到一级子节点
/// </summary>
/// <param name="id"></param>
/// <returns></returns>
public string AsyncGetNodes(int? id)
{
var model = irepository.GetEntities()
.Where(i => i.ParentID == id).OrderBy(i => i.Sortable); return model.ToJson();
}
/// <summary>
/// 添加节点
/// </summary>
/// <param name="id"></param>
/// <param name="name"></param>
/// <param name="pid"></param>
/// <returns></returns>
public string AsyncAddNodes(int id, string name, int pid)
{
try
{
//得到父对象，但设置它的isParent属性
irepository.Modify(i => new Category
{
ID = pid,
IsParent = true,
}); var entity = new Category
{
Name = name,
ParentID = pid,
CreateDate = DateTime.Now,
Level = ,
IsParent = false,
};
irepository.Add(entity); return entity.ID.ToString();
}
catch (Exception ex)
{ return ex.Message;
} }
/// <summary>
/// 编辑节点（重命名）
/// </summary>
/// <param name="id"></param>
/// <param name="name"></param>
/// <returns></returns>
public string AsyncEditNodes(int id, string name)
{
try
{
irepository.Modify(i => new Category
{
ID = id,
Name = name,
});
return "操作成功";
}
catch (Exception ex)
{ return ex.Message;
}
}
/// <summary>
/// 删除节点
/// </summary>
/// <param name="id"></param>
/// <returns></returns>
public string AsyncDelNodes(int id)
{
try
{
irepository.Remove(irepository.GetEntity(i => i.ID == id));
return "操作成功";
}
catch (Exception ex)
{
return ex.Message;
}
}
/// <summary>
/// 拖拽节点
/// </summary>
/// <param name="id"></param>
/// <param name="pid"></param>
/// <param name="sortable"></param>
/// <returns></returns>
public string AsyncDragNodes(
int id,
int pid,
string name,
string moveType,
bool isCopy)
{
try
{
var parent = irepository.GetEntity(i => i.ID == pid);
var parentSons = irepository.GetEntities(i => i.ParentID == pid);
var current = irepository.GetEntity(i => i.ID == id);
if (moveType == "inner")
parent.isParent = true;
else if (parentSons == null || parentSons.Count() == )
parent.isParent = false;
if (isCopy)//复制，前台目前不能实现
{
irepository.Add(new Category
{
ParentID = pid,
Name = name,
CreateDate = DateTime.Now,
});
}
else
{
if (moveType == "inner")
{
current.ParentID = pid;
irepository.Modify(current);
}
else
{
current.ParentID = parent.ParentID;//同级移动时，与目标节点父ID相同
current.Sortable = moveType == "next"
? parent.Sortable +
: parent.Sortable - ;
irepository.Modify(current);
}
}
irepository.Modify(parent);
return "操作成功";
}
catch (Exception ex)
{ return ex.Message;
}
}
#endregion
好了，上面的代码只是对树结果做的最基本的操作，其中拖拽时的复制操作（按着ctrl键，拖拽节点），后台没有进行实现。