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- ---
- title: Component Extensions
- order: 6
- layout: page
- ---
-
- [[components.extensions]]
- = Component Extensions
-
- Components and UIs can have extensions which are attached to the component
- dynamically. Especially, many add-ons are extensions.
-
- How a component is extended depends on the extension. Typically, they have an
- [methodname]#extend()# method that takes the component to be extended as the
- parameter.
-
-
- [source, java]
- ----
- TextField tf = new TextField("Hello");
- layout.addComponent(tf);
-
- // Add a simple extension
- new CapsLockWarning().extend(tf);
-
- // Add an extension that requires some parameters
- CSValidator validator = new CSValidator();
- validator.setRegExp("[0-9]*");
- validator.setErrorMessage("Must be a number");
- validator.extend(tf);
- ----
-
- Development of custom extensions is described in
- <<dummy/../../../framework/gwt/gwt-extension#gwt.extension,"Component and UI
- Extensions">>.
-
-
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