Regardless of which language you decide to use, scripting or managed code, you need to understand how event programming works. Most applications created for the Windows platform use event programming to enable developers to capture events that occur and create routines to perform tasks based on those events.
In Windows, events occur when a user clicks a button, data is entered in a field, or a key is pressed. Windows applications also have their own set of events that can be programmed against, so that developers can control their applications. The object model of an application will include the available events in a development environment such as InfoPath. Object models will be discussed in the next couple of chapters, but for now take a look at the available events created for your use in InfoPath forms.
As with other development environments, InfoPath has some built-in events that can be utilized to perform tasks when triggered. The following table outlines those events.
|Event Name||Description of When Event Occurs|
|OnAfterChange||After you have changed the XML document that is bound to a form.|
|OnAfterImport||After data has been import or merged into a form.|
|OnBeforeChange||Before changes are made to the XML document bound to the form.|
|OnClick||When a command button is clicked on a form.|
|OnContextChange||When moving from one element on a form to another. An example is moving from one field to another.|