I'd like to have a pop up that contains an aspx page. It appears that adding an aspx page to a web part is not possible. When I went to add a new item to the project the closest I could find were ascx or htm.

In an effort to get something I tried adding the htm page, first to the project and then to the Layouts Mapped folder. Everytime I opened the popup it gave me a 404 error.

Here is the html/javascript I had when the file was in the Layouts mapped folder:

<a href="javascript:OpenPopUpPage('ProjectName/test.htm');">Show Me the Pop-Up!</a>

and here is what I had when it was in the project base:

<a href="javascript:OpenPopUpPage('test.htm');">Show Me the Pop-Up!</a>

Does it look like I have done anything wrong here? Is it possible to add an aspx to a web part? If not, is there an alternative?

2 Answers 2


I think your URL is also misconstructed. If your ASPX sits in the layouts folder you should add the path to that page including _layouts.

<a href="javascript:SP.UI.ModalDialog.OpenPopUpPage('/_layouts/mypage.aspx');">
  • +1, awesome. That worked for the html page, no more 404 error! Do you know if it's possible to add a aspx to my web part or should I just try with an ascx or something? I definitely need the pop up to have ASP.NET functionality. Commented Apr 13, 2011 at 6:25
  • 1
    The popup expects a page like an ASPX or HTML file. ASCX files cannot be opened directly from the client due to it being a control and not a page. ASP.NET actively blocks requests for ASCX files coming from the client.
    – Wouter
    Commented Apr 13, 2011 at 9:05
  • Also note that 'add a aspx to a webpart' is something that is not possible. A web part is an ASP.NET Control, a page is, well, a page. The two have little in common. You can add a page to your project and then have your webpart render a link to that page, for instance using that script.
    – Wouter
    Commented Apr 13, 2011 at 9:07
  • Hmmm, all components and functionality need to be contained in a single WSP file. Is there a way for me to do that if I need to have a WSP? Commented Apr 13, 2011 at 14:30
  • Actually I was able to add an "Application Page" which is an aspx page. I'll keep you posted on how well that works for my needs Commented Apr 13, 2011 at 14:31

I think you are missing the js namespaces

Try replacing the call with SP.UI.ModalDialog.OpenPopUpPage()

<a href="javascript:SP.UI.ModalDialog.OpenPopUpPage('yoururl');">Show Me the Pop-Up!</a>
  • No that didn't work. Just to be clear, I am getting the SharePoint style pop up. It just has a 404 error inside the pop up. Commented Apr 13, 2011 at 6:23

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