how to add a pop up warning on server control button 1

skitty123 · Jun 16, 2004

I am trying to create a logout button on my application. which ends the users session, I currently have an HTML button with a runat=server since I have it doing the following actions 'onclick':

myownclass.unsetUserInfo();//my own function
Session.Abandon();
Server.Transfer("~/Home/LoggedOut.aspx");

Is it possible to also add a pop-up message box when the user clicks this button? I dont know how to add a box before it calls the serverside function.

jzelhart · Jun 16, 2004

Please try to use the search this question was just answered yesterday.

thread855-860041

Hope everyone is having a great day!

Thanks - Jennifer

skitty123 · Jun 22, 2004

Thanks but I was looking for an example in C# , the thread you pointed to was in VB, and i tried to modify it but not being very familier with java script i keep getting errros:
I tried this:
javascript: return confirm("Are you sure you want to delete this record?'");

gives me an errro saying cannot recognize 'confirm'
Also what do I use for just a OK type of message box ( no yes/no)

LV · Jun 22, 2004

Substitute the html <input type=button> with a Button server control and handle the above login in its Click event. In page code behind in the OnInit event, attach javascript to this button:

Code:

html:
<asp:Button ID="myButton" Runat=Server />

code behind:
private void myButton_Click(object sender, System.EventArgs e)
{
  myownclass.unsetUserInfo();//my own function 
  Session.Abandon();
  Server.Transfer("~/Home/LoggedOut.aspx");
}

override protected void OnInit(EventArgs e)
{
  //
  // CODEGEN: This call is required by the ASP.NET Web Form Designer.
  //
  InitializeComponent();
  base.OnInit(e);

  // attach javascript to the onclick event of rendered button
  if(myButton.Attributes["onclick"] == null)
  {
    myButton.Attributes.Add("onclick", "javascript:return confirm('Are you sure you want to delete this record?')");
  }
}

The client side onclick will execute prior to the server side Click event. If false returned from the confirm, the form won't post back and the server side Click event will not fire.

skitty123 · Jun 23, 2004

thanks LV! it works great. but how do i capture the return value from the question in the message box
ie
1) if Yes --- do something
2) if no -- something else

LV · Jun 23, 2004

Where do you need to capture it? On the client or server? And what is the purpose for capturing the return value?

skitty123 · Jun 23, 2004

I need to capture it on the server i guess. the purpose is , say the user pressed a button called "Delete". the pop up box gives the user a warning asking "are you sure you want to delete this?"
if the user says yes: call delete function
if the user says no: call some other fucntion.

LV · Jun 23, 2004

Well, the above functionality will do the following (correct me if I'm wrong):
1. If the user says yes: the post back will occur and the Click server side event of the Button will fire - you perform the delete in there.
2. If the user says no: do you really need to call another function? The user just changed his mind and nothing should occur - no post back. It's a "cancel" ot "do nothing" logic.

skitty123 · Jun 23, 2004

Yes, in this case I probably dont care , but was just curious if it was possible to capture the return value

LV · Jun 23, 2004

Sure possible on the client, but getting it to the server would be more complicated:

Code:

<head>
 <script language=javascript>
   function confirmDelete(){
     var doDelete = false;
     if(confirm("Are you sure...?")){
       // "Yes": return true to post back
       doDelete = true;
     }
     else{
       // "No": for example, redirect to another page
       window.location = "/somePage.aspx";
     }

     return doDelete;
   }
 </script>
</head>
.......................
if(myButton.Attributes["onclick"] == null)
{
  myButton.Attributes.Add("onclick", "javascript:confirmDelete()");
}

skitty123 · Jun 23, 2004

Thanks so much LV, exactly what I needed to know!!!

skitty123 · Jun 23, 2004

one more question: is it possible to show the message box AFTER the server code has run ? as in
"Thank you. your changes have been saved." ....after a user presses "Submit".

I tried to add this code inside the click event of a submit button. but nothing happens.

btnSubmit.Attributes.Add("onclick", "javascript:alert('Your change has been saved.');");

LV · Jun 23, 2004

Possible. Just do it inside of the server side Click event of your Button control:

Code:

using System.Text;
.........................
private void myButton_Click(object sender, System.EventArgs e)
{
  // some logic here...
  StringBuilder sb = new StringBuilder();
  sb.Apppend("<script language=javascript>");
  sb.Append("function window.onload(){");
  sb.Append("alert('Your change has been saved.');}");
  sb.Append("</script>");

  if(!Page.IsClientScriptBlockRegistered("SaveConfirm"))
  {
    Page.RegisterClientScriptBlock("SaveConfirm", sb.ToString());
  }  
}

This should display the alert box after your server side script is processed on top of rendered page HTML.

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how to add a pop up warning on server control button 1

skitty123

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jzelhart

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skitty123

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LV

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skitty123

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LV

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skitty123

Technical User

LV

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skitty123

Technical User

LV

Programmer

skitty123

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skitty123

Technical User

LV

Programmer

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