?
Solved

ASP.NET call javascript function before postback

Posted on 2009-05-20
3
Medium Priority
?
1,471 Views
Last Modified: 2012-05-07
I know this has been asked may times before, but it's not working for me.
Using ASP.NET 2.0 / VB:
I simply want to pop a javascript confirm box from an event before a post if a condition is true.

If iCount > 0 Then

  Dim strJSconfirm As String
     strJSconfirm = "<script type='text/javascript'>" & vbCrLf
     strJSconfirm += "function delRC(){" & vbCrLf
     strJSconfirm += "confirm('are you sure you want to delete?');}" & vbCrLf
     strJSconfirm += "</script>"

     ClientScript.RegisterStartupScript(Page.GetType(), "jsDelRC", strJSconfirm)

End If

But it just refreshes the page, and writes the code block to it.
How do I get it to fire?
0
Comment
Question by:el_scotty
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 10

Expert Comment

by:MaxOvrdrv2
ID: 24433562
when/where do you want it to fire? this would kinda do it right here if you just want it to fire when the condition is true:
If iCount > 0 Then
 
  Dim strJSconfirm As String
     strJSconfirm = "<script type='text/javascript'>" & vbCrLf
     strJSconfirm += "function delRC(){" & vbCrLf
     strJSconfirm += "confirm('are you sure you want to delete?');}" & vbCrLf
     strJSconfirm += "delRC();" & vbcrlf
     strJSconfirm += "</script>"
 
     ClientScript.RegisterStartupScript(Page.GetType(), "jsDelRC", strJSconfirm)
 
End If

Open in new window

0
 
LVL 1

Author Comment

by:el_scotty
ID: 24436749
Thanks,
Don't know how I missed the obvious there. That did alllow the js to execute, however I was hoping it would keep any code after the RegisterStartupScript from executing until confirmed.

The code above is in an event fired when user clicks an image button biound to a repeater control, which: Checks the database, if condition is met (iCount > 0) then confim dialog.
I want to: Cancel ->Halt or OK->Continue

So is it possible to do this, in this approach. I have yet to integrate AJAX so I'm looking to do it w the familiar. I guess I could have the js above fire another event (hidden button), but just thought I could keep it more simple.
0
 
LVL 10

Accepted Solution

by:
MaxOvrdrv2 earned 375 total points
ID: 24440158
ahh... yes i was wondering... in that case, this will do it:
If iCount > 0 Then
 
  Dim strJSconfirm As String
     strJSconfirm = "<script type='text/javascript'>" & vbCrLf
     strJSconfirm += "function delRC(){" & vbCrLf
     strJSconfirm += "if(confirm('are you sure you want to delete?')) & VBCrlf
     strJSconfirm += "{CALL AJAX FUNCTION!}" & vbcrlf
     strJSconfirm += "return}" & vbCrLf
     strJSconfirm += "delRC();" & vbcrlf
     strJSconfirm += "</script>"
 
     ClientScript.RegisterStartupScript(Page.GetType(), "jsDelRC", strJSconfirm)
 
End If

Open in new window

0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I would like to start this tip/trick by saying Thank You, to all who said that this could not be done, as it forced me to make sure that it could be accomplished. :) To start, I want to make sure everyone understands the importance of utilizing p…
The article shows the basic steps of integrating an HTML theme template into an ASP.NET MVC project
This tutorial will teach you the special effect of super speed similar to the fictional character Wally West aka "The Flash" After Shake : http://www.videocopilot.net/presets/after_shake/ All lightning effects with instructions : http://www.mediaf…
In this video, Percona Director of Solution Engineering Jon Tobin discusses the function and features of Percona Server for MongoDB. How Percona can help Percona can help you determine if Percona Server for MongoDB is the right solution for …

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question