In the Application Builder, custom code is represented by a Method node. To be able to write code, you must first create a Method node. To create a Method node, click the New Method button (
) in the Method ribbon toolbar, or right-click the Methods node (
) in the Application Builder window and select New Method.
) in the Method ribbon toolbar, or right-click the Methods node () in the Application Builder window and select New Method.The new Method node appears under the Methods node in the Application Builder tree. It is also possible to create local methods in some of the form objects in a form. These local methods connect to events in the form objects, such as when the setting (data) changes for a check box. The Method node is used for referring to the method from a command sequence or a form object’s event.
A Method node contains COMSOL code and Java® code, which you can inspect and edit by double-clicking it in the Application Builder window or by right-clicking and selecting Edit. When a method is opened, it appears in a method editor window.
The changes made to the code in an editor tab are stored in the Application Builder model when you close the tab or after compiling the code. To compile and check the syntax of the code, click the Check Syntax button (
) in the ribbon toolbar.
) in the ribbon toolbar.The code defines an ApplicationMethod Java class. This class has a method called execute that the Command Sequence calls when the application runs it. A typical use case is that you create a Method node, write some code in the execute method, and link this code to a Command Sequence that a form object in the application’s user interface can trigger. Methods that affect the state of form objects apply immediately.
The default setting is to only display the code contained inside the execute method. To display all code, enable the View all code check box, which is a preference setting in the Methods section of the Preferences dialog box.
When the execute method is triggered while running the application, model is the model object of the application. From it, you can access, for example, features of the physics and change their parameters.