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11.29.06
JavaScript: Alert.Show(”message”) From ASP.NET Code-behind
 By
Mads Kristensen
In highly interactive websites and intranet sites, you probably want to let the users know what's going on when they delete, save, export etc. on the site.
Those kinds of status messages are widely used and are often implemented by a JavaScript alert box on the web page. ASP.NET doesn't natively support JavaScript functions from the code-behind files. You manually have to print out a script tag and add the alert() call to it.
As easy as it may be, the extensive use of the alert() status message though out a website calls for a unified and simple implementation in order to avoid duplicate code - a centralized method.
In Windows Forms it is very easy to pop up a status message by calling MessageBox.Show("message"). It is that kind of object model we want in ASP.NET for printing out JavaScript alerts. We want Alert.Show("message") in ASP.NET.
Such a thing doesn't exist so we have to create it our selves.
I've written a static class called Alert with one public method called Show. The implementation is as simple as can be. Just put the .cs file in the App_Code folder on your website and you instantly have access to the method from all pages and user controls.
Demonstration
That class of only 30 lines of code enables us to add a JavaScript alert to any page at any time. Here is an example of a Button.Click event handler that uses the method for displaying status messages.
If something was saved without problems, this JavaScript alert box will apear to the user of the website:
Download
Alert.zip (0,57 KB)
Comments
About the Author:
Mads Kristensen currently works as a Senior Developer at Traceworks located
in Copenhagen, Denmark. Mads graduated from Copenhagen Technical Academy with a multimedia degree in
2003, but has been a professional developer since 2000. His main focus is on ASP.NET but is responsible for Winforms, Windows- and
web services in his daily work as well. A true .NET developer with great passion for the simple solution.
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