How to call code behind server method from a client side JavaScript function?

Solution 1:

Yes, you can make a web method like..

[WebMethod]
public static String SetName(string name)
{
    return "Your String"
}

And then call it in JavaScript like,

PageMethods.SetName(parameterValueIfAny, onSuccessMethod,onFailMethod);

This is also required :

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

Solution 2:

In my projects, we usually call server side method like this:

in JavaScript:

document.getElementById("UploadButton").click();

Server side control:

<asp:Button runat="server" ID="UploadButton" Text="" style="display:none;" OnClick="UploadButton_Click" />

C#:

protected void Upload_Click(object sender, EventArgs e)
{

}

Solution 3:

If you dont want to use ajax than

Code behind 

void myBtn_Click(Object sender,EventArgs e)
{
   //SetName(name); your code
}


.aspx file

<script language="javascript" type="text/javascript">
    function btnAccept_onclick() {        
        var name;            
        name = document.getElementById('txtName').value;
        document.getElementById('callserver').click();
        // Call Server side method SetName() by passing this parameter 'name'
</script>


<div style="dispaly:none;">
  <input type="button" id="callserver" value="Accept" click="myBtn_Click" runat="server" />
</div>
<input type="button" id="btnAccept" value="Accept" onclick="return btnAccept_onclick()" />

or use page method

.cs file
[ScriptMethod, WebMethod]

   public static string docall()
   {
      return "Hello";
   }

.aspx file

<script type="text/javascript">
      function btnAccept_onclic() {
          PageMethods.docall(onSuccess, onFailure);
      }

  function onSuccess(result) {
          alert(result);
      }


      function onFailure(error) {
          alert(error);
      } 

</script>

check this : http://blogs.microsoft.co.il/blogs/gilf/archive/2008/10/04/asp-net-ajax-pagemethods.aspx