Unresponsive UpdatePanel and UpdateProgress components causing frustration

When using OnSelectedIndexChanged in this way:

<asp:DropDownList ID="ddl1" AutoPostBack="true"  OnSelectedIndexChanged="Test_SelectedIndexChanged" runat="server"></asp:DropDownList>

The UpdatePanel and UpdateProgress function correctly, displaying my gif as expected.

However, if I change it to call a javascript function, like so:

<asp:DropDownList ID="ddl1" AutoPostBack="true" onchange="selectValues()" runat="server"></asp:DropDownList>

The progress indicator no longer appears. This change is necessary because scripting needs to be incorporated into the managed code, specifically relating to Silverlight.

Is there a solution available for this issue?

asp.netjavascriptsilverlight

Answer №1

When your update panel fails to refresh, the updateprogress control will also fail to function properly. If you attempt to make an update without triggering the update of the updatepanel (such as using your own JavaScript), the updateprogress will be ineffective.

Answer №2

One possible reason for this behavior could be that the progress is linked to update when the UpdatePanel is refreshed.

Have you checked if selecting an option from the second drop-down triggers the update panel?

You might need to add an OnSelectedIndexChanged event to your drop-down that doesn't do anything but still triggers the update panel.

You can also consider adding some JavaScript in your SelectValues() function to display the progress panel. This panel could just be a div with an image that you can make visible by changing its CSS properties through JavaScript.

I hope this information is helpful to you!

Answer №3

It appears that the JavaScript is causing a false return value. This may be preventing the server-side dropdown selectedindex change event from firing properly, as it does not trigger a full page postback.

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