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Answer 1

+1 A:

In the example that you include in your question, there is no viewstate involved; there is no way for the server to link this request to a previous request of the page and treat them as a unit. The request resulting in clicking the button will look like any other random request coming in to the server.

Fredrik Mörk 2009-05-06 12:09:15

Answer 2

A:

You could check the headers to see if your input controls are returning a value (using Request.Forms as tvanfosson points out). However, the really big question is why you would not want to add runat=server. The entire page processing edifice implemented by ASP.NET (except MVC) depends on processing the page output through the server to set up the appropriate client-side code for callbacks, etc.

Mark Brittingham 2009-05-06 12:09:15

Answer 3

+11 A:

Check the Request.Form collection to see if it is non-empty. Only a POST will have data in the Request.Form collection. Of course, if there is no form data then the request is indistinguishable from a GET.

As to the question in your title, IsPostBack is set to true when the request is a POST from a server-side form control. Making your form client-side only, defeats this.

tvanfosson 2009-05-06 12:10:16

+1 from me. I was running a bit behind remembering that Request.Forms was where you'd pull raw input form data. This is the right answer. I'm still curious, though, why Ian isn't setting up page handling.

Mark Brittingham 2009-05-06 12:14:22

@Mark - Im being "hardcore" and doing everything myself. Don't ask why :-)

Dead account 2009-05-06 12:44:35

+1 @tvanfosson - I marked the other question as answer, because I can also include "Request.Form.Keys.Count > 0"

Dead account 2009-05-06 13:09:34

Answer 4

A:

Generally a you could view a PostBack as a combination of:

HTTP request method equals "POST"
HTTP header HTTP_REFERER equals the current URL

That's not 100% foolproof tho, it does not take into account any state of any kind (which you probably want even if you don't know it) but it is a post, back to the current page.

Kris 2009-05-06 12:18:40

Answer 5

+3 A:

One way to do this is to extend the ASP.NET Page class, "override" the IsPostBack property and let all your pages derive from the extended page.

public class MyPage : Page
{
    public new bool IsPostBack
    {
        get 
        { 
          return 
            Request.Form.Keys.Count > 0 &&
            Request.RequestType.Equals("POST", StringComparison.OrdinalIgnoreCase); 
         }
    }
}

Allrameest 2009-05-06 12:31:15

+1 This is probably the solution to my problem. Thanks

Dead account 2009-05-06 12:43:38

that would actually be more suited for a property named "IsPost".

Kris 2009-05-06 12:48:04

Editted to include "Request.Form.Keys.Count" I can then look up the value from the textbox using Request.Form["ctrl"]

Dead account 2009-05-06 13:09:04

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What does IsPostBack actually mean?

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