Basic Building Blocks (Magic xpa 4.x)

A Magic xpa task is built in three basic sections: the Data View, Logic, and Forms. In a Rich Client task:

• Data View is built on the server.

• The Forms interact with the user.

• Some Logic handlers execute on the server, some on the client, and some are mixed.

We'll take a look at each of these sections in turn.

However, variables, functions, user functions, and expressions are used in all of these sections.

• Variables are declared in the Data View. Usually they are neutral, but some are server-side.

• Functions are built-in to Magic xpa, and by their nature are client-side, server-side, or Neutral.

• User functions are created by you, the developer, and their side depends on the operations and variables they use.

• Expressions are built using the items above. These are especially important because they are used in properties all over the task, in Ranges, Inits, Conditions, Controls, and Forms.