Calling C# function through Javascript (without Json)

Question

I have a function named "callfunction()" in JavaScript(Mypage.aspx) .This function should call another function "func()" in C# (Mypage.aspx.cs )

Something like this:

(in Mypage.aspx)

 function callfunction()

 {

  // i have to call func() function here .....

 }

 </script>

(in Mypage.aspx.cs file)

 public void func()

 {

 // My code goes here

 }

I have researched alot because of this and i ended up so far with 2 conclusions: 1st was to use Json, but my superiors said clearly that they dont want me to do so. 2nd was that i cant do as i wish because of the client, server aspnet protocol

Please give me any kind of tip in how to do this, i am getting desperate

no need for json you can call an event handler of any hidden button of aspx using _postback() — Ali, Jul 01 '13 at 10:34
Hum maybe using postback would be a solution from now, but i dont know if i need more specific way to do this — Chazz1, Jul 01 '13 at 11:00

iJade · Answer 1 · 2016-04-21T03:15:46.580

6

Ok....Try using page methods

First add a script manager on your aspx page

  <asp:ScriptManager ID="scpt" runat="server" EnablePageMethods="true">
</asp:ScriptManager>

Then go to your aspx.cs page and declare a function something like

[System.Web.Services.WebMethod]
    public static string ValidateUser(string emailId, string password)
    {
        //Your logic code
        return returnString;
    }

Then from your javascript call the c# method like

 PageMethods.ValidateUser(email, password, CallSuccess_Login, CallFailed_Login);

And also in ur javascript create 2 call back functions CallSuccess_Login and CallFailed_Login

Hope it helps

edited Apr 21 '16 at 03:15

answered Jul 01 '13 at 10:38

iJade

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This seems to me to be the "use json" answer. I believe they don't want him to use a web service. – Hogan Jul 01 '13 at 10:48
doesn't have to be json.It can be a return type of string too. :) – iJade Jul 01 '13 at 10:49
i am not sure but don't think it has to be JSON in the return type – Ali Jul 01 '13 at 10:55
ill talk with my superiors to ask if i can use page methods, anyway thanks for your help – Chazz1 Jul 01 '13 at 11:24

score 3 · Accepted Answer · edited May 23 '17 at 12:07

If it's a webforms project (not MVC) and you don't want to use AJAX, you can use __doPostBack.

<script type="text/javascript">
 function callfunction(parameter)
 {
     __doPostBack('func', parameter)
 }
</script>

C#:

public void Page_Load(object sender, EventArgs e)
{
  string parameter = Request["__EVENTARGUMENT"]; // parameter
  var senderObject = Request["__EVENTTARGET"]; // func
  if(senderObject == "func")
  {
     //call your function here, or write the implementation
  }
}

score 0 · Answer 3 · answered Jul 01 '13 at 15:02

below are the options available to you

If your using asp.net then use Ajax tools to create this
if you don’t want to user Ajax toolkit use JavaScript __doPostBack
or other option write server side function in the web service and call web method using JavaScript

Calling C# function through Javascript (without Json)

3 Answers3

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