Month: November 2008

.NET Framework 4.0 and Visual Studio 2010 Training Kit

I’m still digesting the changes in .NET 3.5 and SP1, and the guys from Redmond already make a training kit for the next version of the framework. It’s impossible to follow this pace of changes 🙁

The Visual Studio 2010 and .NET Framework 4.0 Training Kit includes presentations, hands-on labs, and demos. This content is designed to help you learn how to utilize the Visual Studio 2010 features and a variety of framework technologies including: C# 4.0, Visual Basic 10, F#, Parallel Computing Platform, WCF, WF, WPF, ASP.NET AJAX 4.0, ASP.NET MVC Dynamic Data.

Get it from http://www.microsoft.com/downloads/details.aspx?FamilyID=752cb725-969b-4732-a383-ed5740f02e93&displaylang=en

NumberField and getElementById

Just a quick lesson learnt today in field:

SCENARIO

You want to use JavaScript to validate certain fields when the SharePoint page is in Edit Mode. You use Control.ClientID ASP.NET property to emit the control ID from the server-side code using Page.ClientScript (usually in PreRender event). You’d usually use this ID to access the control on the client side using document.getElementById.

PROBLEM

I had issues with NumberField (the server-side control that is used to render a numeric column in SharePoint). Its ClientID property is not the same as the one that is finally rendered back. In fact, it’s a child control, two levels down from the NumberField. The reason for this behaviour is that NumberField is a composite templated control, with multiple child controls that compose it.

SOLUTION

Instead of using:

numberFieldCtrl.ClientID

use

numberFieldCtrl.Controls[0].FindControl("TextField").ClientID

to get your correct control ID for JavaScript validation code on the page.