CODEWITHSUNDEEP
javascriptc#asp.net
Skater901
Skater901

Reputation: 27

ASP.NET call a Javascript function

I'm working on a project that uses IP Payments to process transactions. The project involves a web form written in ASP with Code-Behind written in C#.

IPP offers an iFrame implementation, where you can put an iFrame in your page and display a small IPP page with fields for entering credit card information. The idea behind this is that the credit card info will only be handled by IPP and never by the server running the page, thus there is no requirement to ensure that card data is kept secure.

In order to display the IPP page in the iFrame though, a session needs to be initiated with IPP. The server initiates the session, and passes in a SessionID variable. Upon a successful session initiation, a Secure Session Token is returned to the server. The server then needs to "force" the client's browser to GET or POST the SessionID and the SST (Secure Session Token) to the IPP website. This is where my problem is.

I wrote a Javascript function in the ASPX page that would accept two parameters - the SessionID and SST - and send them to the IPP website. I'm now trying to call this Javascript function from my C# code upon successful initiation of the IPP session. However, I have been completely unable to do so.

I've done a lot of searching, and the one answer I keep coming across is to use either RegisterStartupScript or RegisterClientScriptBlock. The problem is, these seem to insert text directly into the page, rather than calling an existing function. Assuming I inserted my function into the page via one of those functions rather than writing it into the page myself, it still doesn't solve my problem of how to call said function.

Now it is possible that I'm going about this the wrong way, and there's a much better way to get the client's browser to GET/POST the SessionID and SST; if so, please tell me. I'm inexperienced with web programming and am thus learning as I go and making up solutions along the way that are quite likely not ideal.

Thanks in advance.

Upvotes: 0

Views: 498

Answers (1)

Felipe Correa
Felipe Correa

Reputation: 693

I think this should work:

Lets say you have something like this in your HTML:

<html>
    <head>
       <script>
          function sendValuesToIPP(sessionId, sst){
              //do stuff
          }
       </script>
    </head>
</html>

If you do this in your C# code it should work

ClientScriptManager.RegisterStartupScript(
    this.Type,
    "some_key_you_want_to_identify_it",
    string.Format("sendValuesToIPP('{0}','{1}')", SessionID, SST),
    true);

Keep in mind that I'm assuming you have SessionID and SST properties server side, you can get them from wherever you want and just add them to the string that will actually call the function when registered in your ASPX.

Upvotes: 1

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