Solved

Looking for Javascript to prevent AJAX postback

Posted on 2008-10-28
2
672 Views
Last Modified: 2010-08-05
I have an aspx page that has a few text fields and a custom control toolbar at the top. The toolbar has links like Save, Save and Close, Refresh and Back. When the page loads, I have a page variable called "ChangesMade" set to zero. When a user types into one of the text fields, I have a javascript function set the page variable "ChangesMade" equal to one. If the user clicks the "Back" button before saving, I check the "ChangesMade" variable and if necessary display a javascript confirm box to see if they want to save their changes. If they click that they do want to abort and have the option to save changes, I set Page_BlockSubmit = true; This works just fine and prevents thte page from posting back.

Now I have put all of this code into an AJAX update panel. When the user clicks Back, the function fires check the "ChangesMade" variable, sets the Page_BlockSubmit = true; BUT this does not prevent the postback. The page still goes to the server wich processes the "Back" command and the changes the user made are lost.

Does anyone know what javascript I need to prevent the AJAX postback from firing? Obviously Page_BlockSubmit = true; is not enough.
0
Comment
Question by:aiscom
  • 2
2 Comments
 

Author Comment

by:aiscom
ID: 22832247
I know there must be some way to this. The AJAX toolkit provides a ConfirmButtonExtender control which confirms a button press and prevents the page from posting back if the person clicks cancel.

I lloked at the Javascript for this control in my debugger, but this is pretty advanced Javascript. Can anyone see how this control is preventing the AJAX postback?
0
 

Accepted Solution

by:
aiscom earned 0 total points
ID: 22833952
I was able to stop the postback by using information from the following site:

http://www.dotnetcurry.com/ShowArticle.aspx?ID=176&AspxAutoDetectCookieSupport=1

I used the event handler to check if changes had been made and if so cancel.

Yeah, I get 500 points for answering my own question.
0

Featured Post

Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

Question has a verified solution.

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

I found this questions asking how to do this in many different forums, so I will describe here how to implement a solution using PHP and AJAX. The logical flow for the problem should be: Write an event handler for the first drop down box to get …
It was really hard time for me to get the understanding of Delegates in C#. I went through many websites and articles but I found them very clumsy. After going through those sites, I noted down the points in a easy way so here I am sharing that unde…
This tutorial gives a high-level tour of the interface of Marketo (a marketing automation tool to help businesses track and engage prospective customers and drive them to purchase). You will see the main areas including Marketing Activities, Design …
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.

785 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