Preventing AutoPostBack According To Confirmation Dialog

Aug 5, 2010

I want to show a confirmation dialog when a specific value is selected in an asp:DropDownList. If the confirmation dialog returns false (cancel) then I want to prevent the AutoPostBack.

<asp:DropDownList id="theDropDownID" onchange="foo()"></asp:DropDownList>

However, it ignores the returned value from foo() and actually does the postback. The generated code of the onchange event is:

foo();
setTimeout("__doPostBack('theDropDownID','')", 0);

so basically controlling the setTimeout that the .net adds, will do the job.

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