private string RenderNode(string prefix, int Level, TreeNode CurrentNode, bool IsLastNode)
{
if (OnNodeRender != null)
{
CurrentNode = OnNodeRender(IsLastNode, Level, CurrentNode);
}
Text = new LinkTag();
List <TreeNode> ChildList = Data.Where(c => c.ParentId == CurrentNode.Id).ToList();
bool HasChild = (ChildList.Count > 0);
string DataAttr = "";
if (NodeKeys.Count > 0)
{
DataAttr = " data=\"({ ids: [" + string.Join(",", CurrentNode.Keys.ToArray()) + "] })\"";
}
string html = "<div class=\"TreeNode\" id=\"" + BaseId + "_TreeNode" + CurrentNode.Id + "\"" + DataAttr + "><span id=\"" + BaseId + "_TreeNodePrefix" + CurrentNode.Id + "\">" + prefix + "</span>";
if (HasChild && IsLastNode)
{
OpenCloseImage.Id = BaseId + "_TreeNodeState" + CurrentNode.Id;
if (CurrentNode.Open)
{
OpenCloseImage.Src = BaseFolder + "tree/minusbottom.gif";
}
else
{
OpenCloseImage.Src = BaseFolder + "tree/plusbottom.gif";
}
OpenCloseImage.SetAttribute("onclick", string.Format(BaseId + ".changeState('{0}','{1}','{2}')", CurrentNode.Id, CurrentNode.Icon, CurrentNode.IconOpen));
html += OpenCloseImage.ToHtml();
}
else if (HasChild && !IsLastNode)
{
OpenCloseImage.Id = BaseId + "_TreeNodeState" + CurrentNode.Id;
if (CurrentNode.Open)
{
OpenCloseImage.Src = BaseFolder + "tree/minus.gif";
}
else
{
OpenCloseImage.Src = BaseFolder + "tree/plus.gif";
}
OpenCloseImage.SetAttribute("onclick", string.Format(BaseId + ".changeState('{0}','{1}','{2}',null)", CurrentNode.Id, CurrentNode.Icon, CurrentNode.IconOpen));
html += OpenCloseImage.ToHtml();
}
else if (!HasChild && IsLastNode)
{
OtherImage.Src = BaseFolder + "tree/joinbottom.gif";
html += OtherImage.ToHtml();
}
else
{
OtherImage.Src = BaseFolder + "tree/join.gif";
html += OtherImage.ToHtml();
}
if (EnableCheckbox)
{
html += "<input onclick=\"" + BaseId + ".checkNode(this,'" + CurrentNode.Id + "')\" type=\"checkbox\" name=\"" + BaseId + "_CHK\" value=\"" + CurrentNode.Id + "\" />";
}
if (EnableNodeImage)
{
OtherImage.Id = BaseId + "_TreeNodeFolder" + CurrentNode.Id;
if (HasChild)
{
if (CurrentNode.Open)
{
OtherImage.Src = (!string.IsNullOrEmpty(CurrentNode.IconOpen)) ? CurrentNode.IconOpen : BaseFolder + "tree/folderopen.gif";
}
else
{
OtherImage.Src = (!string.IsNullOrEmpty(CurrentNode.Icon)) ? CurrentNode.Icon : BaseFolder + "tree/folder.gif";
}
html += OtherImage.ToHtml();
}
else
{
OtherImage.Src = BaseFolder + "tree/page.gif";
html += OtherImage.ToHtml();
}
OtherImage.ClearAttribute("id");
}
Text.SetAttribute("onclick", string.Format(BaseId + ".selectNode('{0}',{1})", CurrentNode.Id, IsLastNode.ToString().ToLower()));
Text.SetAttribute("ondblclick", string.Format(BaseId + ".selectNodeDBL('{0}',{1})", CurrentNode.Id, IsLastNode.ToString().ToLower()));
if (!string.IsNullOrEmpty(CurrentNode.Url))
{
Text.Href = CurrentNode.Url;
if (!string.IsNullOrEmpty(CurrentNode.Target))
{
Text.SetAttribute("target", CurrentNode.Target);
}
}
else if (HasChild)
{
Text.Href = "javascript:" + string.Format(BaseId + ".changeState('{0}','{1}','{2}',null)", CurrentNode.Id, CurrentNode.Icon, CurrentNode.IconOpen);
}
Text.TagContent = CurrentNode.Name;
if (!string.IsNullOrEmpty(CurrentNode.Title))
{
Text.SetAttribute("title", CurrentNode.Title);
}
html += Text.ToHtml() + "</div>";
if (HasChild)
{
string ss = "";
if (CurrentNode.Open)
{
ss = " style=\"display:block\"";
}
html += "<div class=\"TreeNodeChilds\" id=\"" + BaseId + "_TreeNodeChilds" + CurrentNode.Id + "\"" + ss + ">";
if (IsLastNode)
{
OtherImage.Src = BaseFolder + "tree/empty.gif";
}
else
{
OtherImage.Src = BaseFolder + "tree/line.gif";
}
prefix += OtherImage.ToHtml();
for (int i = 0; i < ChildList.Count; i++)
{
IsLastNode = (i == (ChildList.Count - 1));
html += RenderNode(prefix, (Level + 1), ChildList[i], IsLastNode);
}
html += "</div>";
}
return(html);
}