Javascript function from ASP.Net Code behind

Question

I am trying to call javascript from the page code behind on a button click using the following code.

System.Text.StringBuilder sb = new System.Text.StringBuilder();
                sb.Append("<script language=\"javascript\">");
                sb.Append("alert(\"Some Message\")");
                sb.Append("</script>");
                ClientScript.RegisterStartupScript(this.GetType(), "Alert", sb.ToString());

But the javascript is not getting called.

All I want to achieve from this is a popup msg on button click. I dont want to prevent server code execution.

are you really aware of the difference between client- and serverside? ... nothing more to say ... really ... — user57508
– user57508, Commented Oct 21, 2010 at 12:37

Pavel Morshenyuk · Accepted Answer · 2010-10-21 12:43:22Z

1

It seems you're using AJAX Update Panel. If so - you should use ScriptManager to execute your script:

System.Text.StringBuilder sb = new System.Text.StringBuilder();
                sb.Append("<script language=\"javascript\">");
                sb.Append("confirm(\"Some Message\")");
                sb.Append("</script>");
ScriptManager.RegisterStartupScript(
                             page, 
                             page.GetType(),  
                             "Alert", 
                             sb.ToString(), 
                             true);

However, it will not prevent your server-side code from execution if user answer "No" in your Confirm window.

answered Oct 21, 2010 at 12:43

Pavel Morshenyuk

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4 Comments

Mohammad Nadeem Over a year ago

I dont want to prevent the server code execution. All I want is just a popup on button click

Mohammad Nadeem Over a year ago

I am not using AJAX update Panel. Is there any way to call this without that?

WooHoo Over a year ago

yep try ClientScript.RegisterClientScriptBlock();

WooHoo Over a year ago

Nadeem, i've tried RegisterClientScriptBlock from a test page and it works fine. Could you give any more information or a full code sample?

WooHoo · Accepted Answer · 2010-10-21 12:48:01Z

0

If your registering from a button event in an AJAX update panel, try;

ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "ScriptName", sb.ToString(), true);

Cheers Tigger

answered Oct 21, 2010 at 12:48

WooHoo

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Comments

scouty · Accepted Answer · 2014-01-02 21:06:51Z

0

I encountered same problem once, all i wanted was to display a popup on Send Email button click. I achieved that doing following:

if(True)
{
 Response.Write(@"<script language='javascript'>alert('Your e-mail sent successfully!');</script>");
}
else
{
  Response.Write(@"<script language='javascript'>alert('Your e-mail sent Failed! Please Try Again');</script>");
}

answered Jan 2, 2014 at 21:06

scouty

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