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
– nnnnnn, Commented Jun 16, 2012 at 6:21
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
– YavgenyP, Commented Jun 16, 2012 at 6:23

Community · Accepted Answer · 2017-05-23 10:24:32Z

4

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

edited May 23, 2017 at 10:24

CommunityBot

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answered Jun 16, 2012 at 6:24

yogi

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Comments

KV Prajapati · Accepted Answer · 2012-06-16 06:24:01Z

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, 2012 at 6:24

KV Prajapati

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1 Comment

Sunny Over a year ago

But i think vinod want to show confirm box after some manipulation on server side...

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