Web Forms :: Show/Hide Image On Dropdownlist SelectedIndexChanged?

Mar 12, 2010

Basically I have a dropdownlist (ddlSystem) and an AJAX update panel. Inside the update panel I have an asp:GridView (gvSystemSpecs) and an asp:Image (imgLoad).

For triggers on the update panel I have:


When the user changes ddlSystem it makes a service call to pull back a bunch of data and populate the gridview.

I want to be able to show a loading image (imgLoad) when ddlSystem is changed. Once the function to pull data and populate the gridview is complete I need to hide the loading image.

I think I'll need to use some JavaScript, but what ever I try doesn't work and I don't know if the update panel has anything to do with it...

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