Chart empty when using Updatepanel

Question

I have 3 parts in a webpage.

1. Search - clicking a button is supposed to trigger the update panel on 3 and render the chart.
2. Hidden Grid - in an updatepanel1 refreshed on the chart click from 3.
3. Chart - in an updatepanel2

When I click search, the chart displays without flicker. When the chart is clicked, the grid in 2 gets refreshed but the chart is empty.

I tried setting the Viewstate on the chart to true. Any suggestions?

Answer 1

If chart click triggers updatepanel1, this should not happen - chart should not be updated. Please check "Interactivity and AJX\AJAX\Chart as Trigger" chart web sample.

Delian

Answer 2

I believe it looks as you mentioned but still not sure why it would render the chart empty when the second updatepanel is brought into the picture.

 <asp:Button ID="btnSearch" runat="server" Text="Search" OnClick="btnSearch_Click" />

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>Gridview Here</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Chart1" EventName="Click" />
</Triggers>
</asp:UpdatePanel>

<asp:UpdatePanel ID="UpdatePanel2" runat="server" >
<ContentTemplate>Chart Here</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnSearch" EventName="Click" />
</Triggers>
</asp:UpdatePanel>

Answer 3

Things started working fine when I added the attribute

<asp:Chart EnableViewState="true"

Previously, I was doing this in the code behind and must have missed something.