Two Forms One Page - possible?

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My user's requirement is simple: have two buttons on the page, one that displays a PDF in a new window, and another that performs a calculation and displays the result in the same window. If I set

C#

Form.Target = "_blank";

in the Page_Init, it puts the results for both buttons in a new window. If I leave it alone, it puts both of them in the same window. As far as I can tell, I need two forms with separate targets, one for each button, but all my searchy-fu seems to indicate that this is not possible with ASP.Net. Has anyone done anything like this?

Posted 14-Nov-12 10:12am

Matt Maynard

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Casey Sheridan 14-Nov-12 16:15pm

Can you perform the calculation in the new window?

Matt Maynard 14-Nov-12 16:24pm

No, the requirement is that the results from that button be displayed in the same window. Essentially, I have to decide the Form.Target value before the user clicks one of the buttons - hence the two form idea.

ZurdoDev 15-Nov-12 8:26am

Is the pdf just a hyperlink? If not, use JavaScript to open it in a new window and just stick with one form.

Matt Maynard 15-Nov-12 12:29pm

That's one possibility, but the button decides what pdf to show based on a text input. If the pdf does not exist, I need to display an error message on the page. I suppose I could do the file check in javascript (maybe), then redirect if it exists.

Alternately, I could pop the second window at a different page (call it viewpdf.aspx) and redirect back to the original page, but then I'd have to display the 404 error message there. It's worth thinking about though.

ZurdoDev 15-Nov-12 12:48pm

Possibly call a webservice using jQuery's ajax() call and if the result coming back is that the file does not exist than you can display that message otherwise maybe you pass back the url of the pdf and then can use window.open().

2 solutions

Solution 1

No, ASP.NET requires only one. If you add another form tag, it won't have viewstate.

Posted 14-Nov-12 10:16am

Christian Graus

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Matt Maynard 14-Nov-12 16:27pm

That pretty much fits with what I've seen. One thing I saw had two forms but only one of them set to runat="server", but that won't work for me.

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Dave Kreskowiak · Accepted Answer · 2012-11-14T10:34:00

Solution 2

Like Christian said, ASP.NET only allows for a single Form tag per page.

But, it would require restructing your site and code, you could use straight HTML or some other framework, like MVC, which doesn't have the single form limit.

Posted 14-Nov-12 10:34am

Dave Kreskowiak