Member Avatar for SushilKumar

Hi Guys,

Is it possible to call the C# function from Javasript......

Sushil Kumar :rolleyes:

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  • 13 Replies
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  • 8 Years Discussion Span
  • Latest Post Latest Post by einbump

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You cannot reach into the server process from JavaScript, but you can expose a server endpoint and call it from the browser. In classic ASP.NET Web Forms, the lightest-weight option is a Page Method: a static method on your page marked with [WebMethod] and enabled via ScriptManager. The framework generates a PageMethods proxy you can call from JavaScript without a full postback.

Example (Web Forms):

<!-- .aspx -->
<asp:ScriptManager runat="server" EnablePageMethods="true" />

<script>
  function greet() {
    PageMethods.Greet("Sushil",
      function (result) { console.log(result); },
      function (err) { console.error(err.get_message()); });
  }
</script>
// .aspx.cs
using System.Web.Services;

[WebMethod]
public static string Greet(string name)
{
    return "Hi " + name;
}

Notes:

  • Page methods must be public static and cannot access instance controls; use HttpContext.Current if you need per-request info.
  • Handle errors in the failure callback, and secure sensitive methods (auth, validation, anti-forgery where appropriate).

If you are building new endpoints or not using Web Forms, expose a JSON endpoint (e.g., ASP.NET Web API) and call it with fetch/XHR. See ScriptManager.EnablePageMethods and WebMethodAttribute. For API-based approaches, start with ASP.NET Web API overview.

Recommended Answers

All 13 Replies

Member Avatar for tgreer

Not directly, no. Server-side functions live server-side, client-side functions live on the client.

In fact, the only way to get ANY server-side code to run, is to submit the form. ASP.NET unrolls the HTTP headers, unpackages the hidden ViewState variable, re-instantiates objects, and then decides what events to raise based on all of the above.

What you can do is have your JavaScript function set a hidden form variable, then do a form.submit().

Then, in your Page_Load handler on the server, use the Request object to check for the presence and/or value of this variable, and call the appropriate server-side method.

Member Avatar for serkan sendur

Hi Guys,

Is it possible to call the C# function from Javasript......

Sushil Kumar :rolleyes:

Yes it is possible to call C# function through javascript using Ajax extensions in Asp.Net

Member Avatar for SheSaidImaPregy

You're a little late serk.. :)

Aug 24th, 2005

Member Avatar for binbotboo

Just a quick thought here. Vfp programmer learning C#, .net, etc. Even with the time differences on the post I found it really helpfull on my learning curve. Thanks guys!!!
Oct 27, 3009!

Member Avatar for ithelp

Just a quick thought here. Vfp programmer learning C#, .net, etc. Even with the time differences on the post I found it really helpfull on my learning curve. Thanks guys!!!
Oct 27, 3009!

Attention Dani ! We have got an alien from future in this board.

Member Avatar for nimsayunab

my ID :

without using javascript how to call a server side in function in textbox onblur event

ex:

public void disp()
{
Response.Write("Hi");
}

page_Load()
{
TextBox1.Attributes.Add("onblur","disp()");
}

its not working

how to call this function

without using javascript or any other scripts

similarly i need concept from textbox blur event , not any button events

plz help me to get a code ..

Thanking You

Member Avatar for halilcorak

You should use web service or wcf (axaj)
send method to web service than shuld run to "this.GetType().InvokeMember" for the method

i am using , very good tecnology same windows application,

Member Avatar for kouroshnik

JavaScript can not talk with serverside methods since the client is on the Earth and the server is the Moon. You need to use a spaceship to get there. So you need to either postback the page or look into using Ajax.

visit

source >> http://forums.asp.net/t/1184597.aspx

Member Avatar for palabattle

There is a way to do that. In your page add a button and then call button click via javascript. The event on button click will call a C# method after OnClick is called.

There is a sample for you:

<script language="javascript" type="text/javascript">

function ParentWindowFunction()

{
    document.getElementById('<%=cmdUpdateField.ClientID%>').click();
}

</script>


//---------------
<asp:LinkButton CssClass="dnnPrimaryAction"
ID="cmdUpdateField" runat="server" Text="Update Fields" 
onclick="cmdUpdateField_Click" ></asp:LinkButton>


//--------------In your code behind page
protected void cmdUpdateField_Click(object sender, EventArgs e)
{
    DoSomething();
}

As you can see. When you call javascript name ParentWindowFunction it will active the method at code behind. This is how javascript communicate with C#
Member Avatar for einbump

bump

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