Submit Form via code behind?

[NathyZif]

I know I know, why would I want to submit the form from server-side code, if the only way to get to the server-side code was BY submitting the form. But that's just it, when the code-behind page_load event fires it doesn't really "submit" the form as I would like it submitted.

Here's my problem, I made a shopping cart for a website, and to get the information securely paid for I need to send a form to paypal using method="post" and action="big long url". In asp.net I can't have multiple forms with runat="server" on the same web page, so what I did was create a new page with the only form being the send-to-paypal form, and the page_load event handler in the codebehind populates the form tag with the correct transaction information (item names, prices, shipping, etc). Currently I have to have it create a button here too with type="submit". You have to click the button before the transaction is sent to paypal. Is there a way to make the Page_Load event fire the form's submit event so I don't have to require a button click?

Here's the html part of the new page with the form:

<div id="SendPaypalInfo" runat="server">
            <FORM action="https://www.paypal.com/cgi-bin/webscr" method="post" runat="server"></FORM>
        </div>
 

and then here's the current Page_Load codebehind:

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        If Not Page.IsPostBack Then
            Dim TextToSend As String = ""
            Dim a As Integer
 
            RetrieveSessionVariables()
 
            TextToSend = "<form name=""PaypalSubmitForm"" action=""https://www.paypal.com/cgi-bin/webscr"" method=""post"" runat=""server"">"
            TextToSend = TextToSend & "<input type=""hidden"" name=""cmd"" value=""_cart"">"
            TextToSend = TextToSend & "<input type=""hidden"" name=""business"" value=""EDITED"">"
            TextToSend = TextToSend & "<input type=""hidden"" name=""upload"" value=""1"">"
TextToSend = TextToSend & "<input type=""submit"" value=""Click Here""></form>"
 
 
            Me.SendPaypalInfo.InnerHtml = TextToSend
 
        End If
    End Sub

Can i submit the form in that very same page_load event? i don't want them to have to click that button :(

[NETSP]

Yes. I am getting the value on alert. Only the submit part is not working. I believe it is because I have runat="server" in the form tag. But if I don't mention this, AJAX method won't be executed. This is like a deadlock for me now!!

[r035198x]

Yes. I am getting the value on alert. Only the submit part is not working. I believe it is because I have runat="server" in the form tag. But if I don't mention this, AJAX method won't be executed. This is like a deadlock for me now!!

How did you specify that the Javascript function should be called on the form?
Instead of having runat server call the javascript function onSubmit() of the form and see what happens.

[NETSP]

<form id="frmLogin" name="frmLogin" onsubmit="submi tf();">

I tried this. But AJAX method didn't get executed. Because I need to have runat="server". If I mention this (as below), the form doesn't get submitted.

<form id="frmLogin" name="frmLogin" runat="server" onsubmit="submi tf();">

[r035198x]

<form id="frmLogin" name="frmLogin" onsubmit="submi tf();">

I tried this. But AJAX method didn't get executed. Because I need to have runat="server". If I mention this (as below), the form doesn't get submitted.

<form id="frmLogin" name="frmLogin" runat="server" onsubmit="submi tf();">

That's strange. You certainly don't need the runat="server" control in order for you to be able to call an AJAX function as illustrated in the example here.

[NETSP]

Here, in this example, everything is done in client side javascript itself. Even the methods are defined in JS. But in my case, I have a public method which will be in server side when I execute the form and it is only available to the form when it runs on server.

[r035198x]

Here, in this example, everything is done in client side javascript itself. Even the methods are defined in JS. But in my case, I have a public method which will be in server side when I execute the form and it is only available to the form when it runs on server.

How's this workaround:
Submit the form before checking the value of the AJAX request then perform the check on the serverside code (you no longer need AJAX for that). An if else on the server side would bring the initial page or proceed with the processing. Of course this means that the page has to be submited ...

[NETSP]

I am not submitting the form to the same page. Once the AJAX method returns true value, the form gets submitted to another server mentioned in action attribute of the form tag.