In this video Joe will walk through writing a custom field handler for views. Demonstrating how to extend the set of handlers that come with the views module in order to provide new functionality or for dealing with new types of data. In this case we'll look at how to treat the numerical values in the databasics module as percentages in views. The method used to write a field handler in this video is similar to overriding other handlers like filters and sorts that will be discussed in coming chapters and provides some important foundations for understanding how to work with all views handlers.
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This video covers a topic in Drupal 7 which may or may not be the version you're using. We're keeping this tutorial online as a courtesy to users of Drupal 7, but we consider it archived.