calling a server side function from javascript without using ajax

Question

I am trying to do the following :

function redirectContactOnClick(contactId) {
            var enc=<%= QueryStringModule.Encrypt("cont="+ contactId)%>;
            alert(enc);
            //window.location = "Contacts/AddEditContact.aspx";
        }

QueryStringModule.Encrypt is a function inside a c# class, the page raise an error saying :The name 'contactId' does not exist in the current context

i updated my question , i don't think the class is causing the issue :/ — Sora
– Sora, Commented Oct 10, 2014 at 11:46
Are you aware that JS is executed on the client (browser), and C# on the server? Your C# code (compiler, actually) has no idea what contactId is. — laruiss
– laruiss, Commented Oct 10, 2014 at 11:46
@Sora: You have to send the contactId from the client to the server somehow. Ajax is the first option you should reach for to do that. A statement like "I don't want to use [the obvious first choice]" really needs to be accompanied by why not. — T.J. Crowder
– T.J. Crowder, Commented Oct 10, 2014 at 12:56

Vladimirs · Accepted Answer · 2014-10-10 11:49:08Z

1

You won't be able to pass your javascript variable (contactId) to C# method. Suggest to look a different solution for that, for example, making Generic Web Handler (.ashx) and pass there your contactId via ajax and get back whatever you expect from your Encrypt call.

answered Oct 10, 2014 at 11:49

Vladimirs

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2 Comments

Sora Over a year ago

i don't want to use ajax

Vladimirs Over a year ago

As alternative you can build another page that accepts contactId and will just redirect you to different page which will encrypt your contractid and redirect to Contacts/AddEditContact.aspx or wherever you want.

larsmoa · Accepted Answer · 2014-10-10 12:24:44Z

1

You can call Server side(C#) function from javascript. First you have include your script inside a ScriptManager runnable at server. Then the javascript function can call the c# function (which is having an attribute of ([System.Web.Services.WebMethod] and must be static) can be accessed.

eg.

 PageMethods.QueryStringModule.Encrypt("cont="+ contactId);

on client-side, and

  [System.Web.Services.WebMethod]
  public static void Encrypt(string id)
  {
       // Do something
  };

on server-side

(Source: http://www.codeproject.com/Questions/727256/how-to-call-server-side-function-from-javascript)

edited Oct 10, 2014 at 12:24

larsmoa

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answered Oct 10, 2014 at 12:09

akhil_jose

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2 Comments

akhil_jose Over a year ago

Source: codeproject.com/Questions/727256/…

Adaephon Over a year ago

Welcome to StackOverflow. You can just click on edit if you want to change something in your post, so there is no need to use comments for that.

Community · Accepted Answer · 2017-05-23 12:20:28Z

0

For to call the Server Side member the only mode is do a request HTTP or sync (POST Page) o async (AJAX)

you don't call a server function directly

in the you case

receive an error because contactId not is an page's member you can comunicate with these way

ASP.NET Client to Server communication

edited May 23, 2017 at 12:20

CommunityBot

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answered Oct 10, 2014 at 11:50

Fabio

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