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Editorial Team
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Asked: 2026-05-13T17:46:52+00:00

I have a problem with expanding/collapsing a Treeview control in an Updatepanel which causes

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I have a problem with expanding/collapsing a Treeview control in an Updatepanel which causes weird behavior and functions fine if placed outside the Updatepanel.

I have found that TreeViews is not supported in updatePanels so my question is:

  • What is a workaround to avoid a full postback whilst keeping expand/collapse functionality as well as TreeNode_clicks that updates another control?
  • Also why does it seem that some people use a TreeView inside an Updatepanel with success? Is this only an ASP2 prolbem?
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  1. Editorial Team

    It’s the loading of the treeview javascript that fails under an updatepanel. I’ve tried putting some explanations and options below in bullet points.

    • The control will work in an updatepanel if it is visible straight away.
    • The control will not work in an updatepanel if it is made visible after a postback.
    • If you disable the client side javascript, the control will work in an updatepanel but will cause a postback every time a plus/minus is clicked.

    Hope that helps

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