Display RadTreeViewContextMenu after postback

[Gene]

I have a RadTreeViewContextMenu on a RadTree that contains an Item Template with a textbox. button, and customvalidator.  On Postback, I need to display the RadTreeViewContextMenu if validation fails.  I'm at a loss on how to do this.  Any ideas?

Thanks in advance,
Gene.

[Veselin Vasilev]

Hi Gene,

Here is how you can do this: if the validation fails register a javascript by using RegisterStartupScript method of the ScriptManager class. That javascript will do the following: finds the context menu and shows it using the showAt client-side method of the menu.

Here is a sample C# code:

StringBuilder script = new StringBuilder();
script.Append("Sys.Application.add_load(function(){");
script.Append("var menu = $find('" + RadTreeView1.ContextMenus[0].ClientID + "');");
script.Append("menu.showAt(100, 100);");
script.Append("});");

ScriptManager.RegisterStartupScript(Page, Page.GetType(), "openContext", script.ToString(), true);

I hope this will get you started.

Greetings,
Veselin Vasilev
the Telerik team

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[Gene]

Thanks for your reply Veselin!

Works great! Next question: How do I dynamically get the position of the contextmenu?

Thanks again,
Gene.

[Veselin Vasilev]

Hi Gene,

Supposing you want to show the context menu over the selected node here is the amended code:

StringBuilder script = new StringBuilder();
script.Append("Sys.Application.add_load(function(){");
script.Append("var menu = $find('" + RadTreeView1.ContextMenus[0].ClientID + "');");
script.Append("var tree = $find('" + RadTreeView1.ClientID + "');");
script.Append("var node = tree.get_selectedNode(); if (node) {");
script.Append("var nodeLocation = $telerik.getLocation(node.get_textElement());");
script.Append("menu.showAt(nodeLocation.x + 20, nodeLocation.y + 10);}");
script.Append("});");

ScriptManager.RegisterStartupScript(Page, Page.GetType(), "openContext", script.ToString(), true);

Sincerely yours,
Veselin Vasilev
the Telerik team

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