Monday, September 18, 2006

In quest of Truly Modal popup in ASP.NET

This is how it all started...I stumbled upon this cool Modal popup control in the Atlas control kit:

http://atlas.asp.net/atlastoolkit/ModalPopup/ModalPopup.aspx

Notice how it blocks the activity on the screen until you are done interacting with the popup. I decided to put this in one of my ASP.NET web applications. But this control immediately became useless to me because I wanted to display the popup based on some logic in the application and the Atlas popup control can only be bound to an ASP.NET control.

After googling on this topic a bit it was clear to me that it cannot be done without using JavaScript (which I was hoping to avoid). I also found this interesting article which explains "how to fill in ASP.NET gaps using client-side magic"

http://www.ondotnet.com/pub/a/dotnet/2003/09/15/aspnet.html

Here is some sample code from this article which shows how to include JavaScript in your ASP.NET code using Page.RegisterStartupScript method.

string popupScript = "window.open('PopUp.aspx', 'CustomPopUp', " +
"'width=200, height=200, menubar=yes, resizable=no')" +

Page.RegisterStartupScript("PopupScript", popupScript);

The Javascript will get placed in the onLoad() event of the page and hence will be executed as soon as the page loads (which would create a popup effect). So now I had an efficient way of managing Javascript in my ASP.NET application. But I still needed the JavaScript for the modal popup when I hit this gem (click on [Test the Alert]) :

http://slayeroffice.com/code/custom_alert/

Also notice how the alert box remains frozen even if you scroll up and down the page. Very COOL!!

The approach is to over-ride the default window.alert javascript function. The person who made this calls it "Pseudo-modality" because this is achieved by using a 100% wide and 100% tall absolutely positioned DIV element that acts as the parent element of the custom alert. This DIV overlays everything on the page and prevents user interaction with elements other than the custom alert.

So now I have this cool Javascript code and also know how to use the Page.RegisterStartupScript method to put Javascript in my ASP.NET application in an organized way. I can't wait to implement this in my application.

I will post about how that goes some other time ...

Comments:
How did that go ?
 
I didnt find thing that i need... :-(
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This script works perfect and is easy to use.

On this site i have found more of this script and the marker, mabey it is handy for you.

http://www.script.ajaxflakes.com

startoy
 
You really should learn more about client-side script and ASP.Net before posting such nonsense.
The only thing of use in this article is the link to http://slayeroffice.com/code/custom_alert/

The rest of your statements are poorly researched and written and encourage nothing short of poor outdated coding techniques.
 
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