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Editorial Team
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Asked: 2026-05-13T16:09:03+00:00

I need to load aspx page into jQuery UI’s modal dialog window. I used

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I need to load aspx page into jQuery UI’s modal dialog window.
I used following approach: load page content via ajax call into dialog’s div and show it:

$.get('Page.aspx', function(response){
    $('#dialog').html(response);
    $("#dialog").dialog('open');
});

but I’ve got very strange error (IE8) in line 137215738 (!): ‘theForm.elements.length’ – is null or not an object. JS debbuger says that source code is not available for such location. I have an assumption that this error happens because of multiple ‘form’ tags that appears on page after ajax call

I wonder, how can i fix this? Or maybe some other way of showing aspx page in modal dialog?

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1 Answer

  1. Editorial Team

    You cannot fully embed one ASPX page’s content within another for a couple of reasons:

    1. You would be nesting <html> tags in a non-sensical way.
    2. You are polluting one page’s javascript state with the other’s.

    You need to render Page.aspx as a partail view, rather than including the entire payload of an ASPX page.

    I’m not 100% sure if you can do this in plain-old-asp.net without calling the Render function of individual controls, using the Response stream as the target.

    In ASP.NET-MVC, however, you can use a PartialView result.

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