How to call a Javascript function having return value in c# codebehind

Question

I am having a page where i need to confirm whether to show updated grid or not

I am calling a javascript function using

ScriptManager.RegisterStartupScript(this, typeof(string), "Error", "confirm('Are u sure');", true);

What I want to know is how to get the return value of confirm in C# code behind.

You can't get the return value of a client-side JavaScript function directly in server-side C# code-behind, that value would need to be submitted. — nnnnnn, Jun 16 '12 at 06:21
usually with confirms you just cancel the event in the case a user clicked "no". You dont have to submit the form at all in this case — YavgenyP, Jun 16 '12 at 06:23

score 4 · Accepted Answer · edited May 23 '17 at 10:24

Instead of this

ScriptManager.RegisterStartupScript(this, typeof(string), "Error", "confirm('Are u sure');", true);

use this

ScriptManager.RegisterStartupScript(this, typeof(string), "Error", "ConfirmUser('Are u sure');", true);

<script type='javascript'>
 function ConfirmUser(msg)
 {
  if(confirm(msg))
    __doPostBack('','');
 }
<script>

see following links to know more about __doPostBack

1 2

score 3 · Answer 2 · answered Jun 16 '12 at 06:24

3

I am having a page where i need to confirm whether to show updated grid or not

You may prevent the postback when use choose Cancel button of confirm dialog.

<asp:Button ID="Button1" runat="server" 
            OnClientClick="return confirm('Are you sure to populate the list?');" 
            Text="Button" onclick="Button1_Click" />

answered Jun 16 '12 at 06:24

KV Prajapati

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But i think vinod want to show confirm box after some manipulation on server side... – Sunny Jun 16 '12 at 06:27

How to call a Javascript function having return value in c# codebehind

2 Answers2

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