Why is my Asp.Net Form arriving empty when I post from Page to Page?

T

4

I have the following HTML Code

<%@ Page Language="C#" %>

<html>
    <head>
        <title></title>
    </head>
    <body>
        <form id="frmSystem" method="post" action="target.aspx">
            <input id="txtTextField" type="text" />
            <input id="btnPost" value="Submit" onclick="javascript:frmSystem.submit();" type="button" />
        </form>
    </body>
</html>

The target Page is coming up but the form that it is receiving is empty. I have a break point on my target.aspx page and while I can see a form, it's keys are empty and Request["txtTextField"] gives me nothing.

Any clue why?

Thinking answered 12/3, 2010 at 15:12 Comment(3)

MVC or webforms? Looks like you are trying to use MVC. – Betook 12/3, 2010 at 15:16

What does your target form code look like? where is your breakpoint? – Ringent 12/3, 2010 at 15:19

For now all I have in my target is this <%@ Page Language="C#" %> <% string text = ""; %> and I'm obviously breaking on the only line of code. I use Watches to verify what I'm getting. – Thinking 12/3, 2010 at 15:34

B

5

If you are using ASP.NET MVC, the input names need to be set with the "name" attribute rather than "id".

Betook answered 12/3, 2010 at 15:18 Comment(3)

I'm using webforms. No code behind, just a dll to handle some database access and the rest is scripts. – Thinking 12/3, 2010 at 15:35

Thanks a lot actually, that was the solution. – Thinking 12/3, 2010 at 15:52

You can use the name rather than id attribute as well as in the Asp.net web application or webforms too. – Demisemiquaver 4/1, 2020 at 12:42

G

2

You probably reset the form value in event handlers (such as page_load).

Gibe answered 4/6, 2013 at 10:41 Comment(1)

I usually blame users for stupid conducts, now the stupid was me. Thanks @Gibe – Armistice 1/10, 2019 at 8:6

O

1

If you are using ASP.NET 4.5 like me, use below hints

Disable auto Friendly URLs in a Web Form project
- settings.AutoRedirectMode = RedirectMode.Off; // in RouteConfig.cs
if you can:
- remove action="CILandingPage.aspx" from form element
- put a asp:button instead of normal button
- set PostBackUrl="~/CILandingPage.aspx" on your asp:button

more resources with more detail that was useful to me

Oncoming answered 17/11, 2016 at 8:40 Comment(1)

Importantly noted in your first link, you can set settings.AutoRedirectMode = RedirectMode.Off inside RouteConfig.cs . It is not necessary to disable auto friendly URLs entirely. – Zosi 18/1, 2017 at 21:24

Z

0

Another option is to capture your Request.Form[] data in Application_BeginRequest on the Global.asax.cs:

protected void Application_BeginRequest(object sender, EventArgs e)
{
    //capture form data and preserve in query string
    if (Request.Form["txtTextField"]!= null)
    {
        Response.Redirect(Request.RawUrl + "?txtTextField=" 
          + Request.Form["txtTextField"]);
    }
    //or preserve in Session variable
    if(Request.Form["txtTextField"]!=null)
    {
        Session["txtTextField"]=Request.Form["txtTextField"];
    }
}

The problem is that the form data is lost on the automatic redirect which is applied by friendlyUrls - if you store that data as something other than form data, it is unnecessary to turn off friendlyUrls or set AutoRedirectMode to RedirectMode.Off.

Zosi answered 18/1, 2017 at 21:31 Comment(0)

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