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
– Ali, Commented Jul 1, 2013 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
– Chazz1, Commented Jul 1, 2013 at 11:00

iJade · Accepted Answer · 2016-04-21 03:15:46Z

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, 2016 at 3:15

answered Jul 1, 2013 at 10:38

iJade

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4 Comments

Hogan Over a year ago

This seems to me to be the "use json" answer. I believe they don't want him to use a web service.

iJade Over a year ago

doesn't have to be json.It can be a return type of string too. :)

Ali Over a year ago

i am not sure but don't think it has to be JSON in the return type

Chazz1 Over a year ago

ill talk with my superiors to ask if i can use page methods, anyway thanks for your help

Community · Accepted Answer · 2017-05-23 12:07:55Z

3

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
  }
}

edited May 23, 2017 at 12:07

CommunityBot

11 silver badge

answered Jul 1, 2013 at 10:44

speti43

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Comments

Yogesh · Accepted Answer · 2013-07-01 15:02:16Z

0

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

answered Jul 1, 2013 at 15:02

Yogesh

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