I encountered a javascript error on submit in my aspx page, with the breakpoint located within the __VIEWSTATE input html element. This error is causing an "Object Expected" issue.
The javascript stack dump only displays "{anonymous}(null)".
I'm unsure of what this means and how to proceed with debugging. Can someone provide insight on how to investigate further?
It appears that when your page is loading, a javascript method is being called that is not present or loaded on the page. Make sure all necessary methods are available during page load and check if these calls are made before the methods are fully loaded.
If you're still unsure, try using Firebug in Firefox for debugging. This tool may help identify the specific javascript method causing the issue.
For optimal debugging of JavaScript, consider using Chrome. I've encountered similar errors when debugging in IE8.
After thorough investigation, I finally uncovered the source of the issue. It turns out that someone made a change to the submit button on the form, transitioning it from:
<asp:Button ID="btnSubmit" runat="server" Text="Submit"
onclick="btnSubmit_Click" />
To:
<asp:Button ID="btnSubmit" runat="server" Text="Submit"
**onClientClick="doSomeUnrelatedCleanup();return true;"**
onclick="btnSubmit_Click" />
As a result, when asp.net processes the page, it appends
WebForm_DoPostBackWithOptions(....)
To the end of the onClientClick attribute. However, due to the return true statement, the Web Forms post back call was never executed.
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