__doPostBack Javascript not working in IE8 & Firefox Browser Not firing my event in c# Button Click Event (btnSubmit_Click)

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var btn = document.getElementById("<%=Button1.ClientID %>");
               btn.click();
               __doPostBack('btn', 'OnClick');




                <div style="display: none;">
                <asp:Button ID="Button1"  runat="server"  OnClick="btnSubmit_Click"/>
                 </div>



           C# Codebind

          public void btnSubmit_Click(object sender, EventArgs e)
          {
        //Code

           }

Posted 24-Jul-15 3:53am

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Richard Deeming · Answer 1 · 2015-07-24T05:22:00

The first argument to the __doPostBack function is the ID of the control which is causing the postback. You are passing the string 'btn', which is the name of the javascript variable, not the ID of the control.

Change your code to:

JavaScript

var btn = document.getElementById("<%=Button1.ClientID %>");
__doPostBack(btn.id, '');