[Solved] HTML encoding for RadTreeNode.Text fails

[Pavel]

Hello

I use RadTreeView with load-on-demand feature (ServerSideCallback). When a node is expanded I create child nodes and do HtmlEncode for its' texts. I see "<input>" text as "<input>" and that's OK. But when I click any child node (I have server-side Click handler that actually do not change any nodes) all "<input>" nodes become text boxes!

I guess it's a bug. Could you give me some workaround?
Thanks.

[Yana]

Hello Pavel,

Actually this is expected behavior of  RadTreeView nodes with "ServerSideCallBack" ExpandMode. I suggest you set ExpandMode to ServerSide and wrap the treeview in RadAjaxPanel in order to avoid reloading of the whole page.

All the best,
Yana
the Telerik team

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[Mark]

I'm not sure how you can say that this issue is expected behavior. If the first presentation of the tree nodes shows the htmlEncoded text correctly, but the a postback someplace on the re-renders the already-expanded nodes, but not htmlEncoded now, that seems to me to be a bug.

I am experiencing this same issue right now... I have a subnode named "x + 5 > 7". It displays fine the first time it's parent is expanded, and the htmlEncoded text is added as a subnode. However, after pressing a postback button on the page, the treeview gets re-rendered with that node showing as "x + 5 >"... the "7" part is gone.

The workaround, by the way, is not an option for me as during the click event of the postback button, I uncheck some of the treeview nodes based on business logic.

Please... a workaround, at least, is need here.

[Pavel]

Hi Mark,

The idea is to encode nodes created in NodeExpand handler again during the following postback. To do it you need
1) save a key of expanded  node (I use Node.Value property) in a list stored in the session and 2) do encoding in Load handler.
Here is a fragment of my Load handler:

if (!this.IsPostBack)
{
    Session["ExpandedNodeValues"] = new List<string>();
}
else if (!this.Page.IsCallback)
{
    List<string> nodeValues = (List<string>)Session["ExpandedNodeValues"];
    foreach (string value in nodeValues.ToArray())
    {
        // encode all children of the node with specified value
        var nodes = FindAllNodes(x => x.ParentNode != null && x.ParentNode.Value == value);
        foreach (RadTreeNode node in nodes)
        {
            node.Text = Server.HtmlEncode(node.Text);
        }
    }
    nodeValues.Clear();
}