Javascript to code behind in c# asp.net

Question

Hi im looking to find out after I do this:

c#

div.Attributes.Add("onclick", "return confirm_delete();");

javascript:

function confirm_delete()
{
  if (confirm("Are you sure you want to delete this comment?")==true)
    return true;
  else
    return false;
}

It pops up with a message box with yes and no if I press yes how can I add a function into my c# how can I call it?

If yes go to c# code behind

and add in confirm_delete 
if yes was clicked
do this

I need it so when some one clickes yes I can (from code behind in asp.net c#) add in a method to delete from mysql database.

Just dont know how I refrence to the javascript

public static string confirm_delete()
{

    return something (dont know how to)

}

arghhhh GOD all i want to do is have a damm message box with yes or no so I can add in a function to delete it~? WHY IS IT SO HARDD — G Gr
– G Gr, Commented Mar 28, 2011 at 19:23

Bryan Weaver · Accepted Answer · 2011-03-28 19:32:23Z

1

How about this add a button with the clientside click event instead of adding it in the code behind. Check to see if the popup returns true. If you return false it should prevent the server side event from firing.

<asp:Button ID="btn" OnClientClick="if(confirm_delete()){
/* post back*/
}else{
return false;
};" OnClick="btnDelete_Click" runat="server" Text="delete"/>



protected void btnDelete_Click(object sender, EventArgs e)
{

  //run your serverside code if confirm was pressed.

}

answered Mar 28, 2011 at 19:32

Bryan Weaver

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2 Comments

G Gr Over a year ago

bweaver your method doesnt cause postback am I missing something?

Bryan Weaver Over a year ago

Sorry, I usually do something in the client click event that causes a post back try changing the code to this: OnClientClick="return confirm_delete();"

3Dave · Accepted Answer · 2011-03-28 19:12:41Z

1

Your JavaScript will need to call a page on your server. This is typically accomplished with AJAX and a web service.

This page on MSDN has a good overview of what's involved.

If you're interested in using jQuery, this page has a simple example.

answered Mar 28, 2011 at 19:12

3Dave

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3 Comments

G Gr Over a year ago

o god, seriously. Is there a way rather than using jquery or javascript to post an asp message box instead for my div?

sehe Over a year ago

yes, you can do a normal postback. Look at LinkButton for the simplest procedure

3Dave Over a year ago

Sure; just post the form if the user clicks "ok"

santosh singh · Accepted Answer · 2011-03-28 19:22:54Z

1

You may be able to use a PageMethod to call your codebehind function, check out the following link for an example

ASP.NET Ajax PageMethods

answered Mar 28, 2011 at 19:22

santosh singh

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1 Comment

G Gr Over a year ago

how do i add pagemethods to my own script?

gbs · Accepted Answer · 2011-03-28 19:24:41Z

0

Wondering why you are using a div? Can't you use asp.net Button / LinkButton and limiting it's postback based on confirm value? e.g.

<asp:LinkButton ID="DeleteButton" runat="server" CausesValidation="False"
    CommandName="Delete" Text="Delete"
    OnClientClick="return confirm('Are you certain you want to delete this 
product?');">
</asp:LinkButton>

Reference.

answered Mar 28, 2011 at 19:24

gbs

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1 Comment

gbs Over a year ago

@Garrith: Then your next best bet will be using jQuery + ajax to do the job. You can call page method or expose your delete functionality via web service.

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