I noticed something rather interesting regarding the way CRM 2011 handles the OnChange event for a Two Option ( or bit field in CRM 4.0 terminology ).

Bit fields can be displayed in one of the following styles:

Radio Buttons

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Note: This is the default configuration.

Checkbox

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List

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The OnChange Event

The normal CRM OnChange Event is fired when a person makes a change to a form field then leaves the field ( using either the tab key or the mouse ).  The Two Options fields in CRM 2011 seem to function differently, depending on how the field is formatted on the screen:

Format OnChange Action
Radio Buttons The OnChange event is fired immediately upon making the radio button selection.
Checkbox The OnChange event is not fired until focus leaves the control.
List The OnChange event is fired immediately upon making the radio button selection.

 

Understanding this action is important because sometimes you need to alter the layout of the form ( hiding or showing items ) based on the setting of a Two Option field.  AND, you don't want the user to have to leave the field to make that change appear. ( that is a very awkward series of actions for a user ).

That means that in most cases, you want to use either the Radio Button format or the List format for a Two Option field so that you get that immediate feedback to the user.