Calling javascript in csharp class

Question

I have a class. There is only deleteRecord function

protected virtual void DeleteRecord
{
    if(..)
    {}
    else(..)
    {
         Page.ClientScript.RegisterStartupScript(this.GetType(), "Alert", "<script language='javascript'>alert('Are you sure?')</script>", true);
    }
}

I want to show javascript message. But I think I made a mistake. How can I do it?

Can you be a little more specific? Have you debugged with your browser to see the resulting output? — Luis Filipe
– Luis Filipe, Commented Jun 27, 2013 at 14:43

Dave Hogan · Accepted Answer · 2013-06-27 14:40:42Z

1

You've added true to the last parameter on Page.ClientScript.RegisterStartupScript which is addScriptTags. See http://msdn.microsoft.com/en-us/library/z9h4dk8y.aspx

Therefore you have essentially added <script> within a <script>

Try this:

Page.ClientScript.RegisterStartupScript(this.GetType(), "Alert", "alert('Are you sure?')", true);

Also ensure the key parameter is unique to the page. If you already have a StartupScript with the key of "Alert" then this can also stop it from calling the JavaScript code.

answered Jun 27, 2013 at 14:40

Dave Hogan

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2 Comments

Tim Schmelter Over a year ago

You could also mention that this makes no sense at all. The user wants to delete a record, so he clicks on a delete-button, a postback happens, the server sends a javascript to the client with an alert('Are you sure?'). He clicks ok or cancel but nothing will happen in either way.

Dave Hogan Over a year ago

Very true @TimSchmelter. To be honest I skipped that only because the code example provided isn't very clear on the implementation. If this server-side approach is essential then @StackOver consider using a return confirm('are you sure'); to only postback when the dialog is confirmed.

Jason Ellingson · Accepted Answer · 2014-08-05 15:00:44Z

0

I created this static class that I can call from any web page: (I use AJAX Toolkit for script manager, but you can use the default one in ASP.NET as well)

public static class ClientJS {
    public static void send(string js) {
        Page page = HttpContext.Current.Handler as Page;
        ToolkitScriptManager.RegisterStartupScript(page, page.GetType(), Guid.NewGuid().ToString(), "setTimeout(function(){" + js + "},1);", true);
    }
}

Use it like so:

ClientJS.send("alert('Are you sure?');");

answered Aug 5, 2014 at 15:00

Jason Ellingson

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