Annotation Type JsModule

@Retention(value=RUNTIME)
 @Target(value=TYPE)
 @Documented
 @Repeatable(value=JsModule.Container.class)
 @Inherited
public @interface JsModule

Annotation for defining JavaScript Module dependencies on a Component class. For adding multiple JavaScript Module files for a single component, you can use this annotation multiple times.

The JavaScript module files should be located:

• inside frontend directory in your root project folder in case of WAR project
• inside META-INF/resources/frontend directory (inside a project resources folder) in case of JAR project (if you are using Maven this is src/main/resources/META-INF/resources/frontend directory).

It is guaranteed that dependencies will be loaded only once. The files loaded will be in the same order as the annotations were on the class. However, loading order is only guaranteed on a class level; Annotations from different classes may appear in different order, grouped by the annotated class. Also, files identified by @JsModule will be loaded before JavaScript and CssImport.

NOTE: while this annotation is not inherited using the @Inherited annotation, the annotations of the possible parent components or implemented interfaces are read when sending the dependencies to the browser.

NOTE: Currently all frontend resources are bundled together into one big bundle. This means, that JavaScript files loaded by one class will be present on a view constructed by another class. For example, if there are two classes RootRoute annotated with @Route(""), and another class RouteA annotated with @Route("route-a") and @JsModule("./src/jsmodule.js"), the jsmodule.js will be run on the root route as well.

Since:

2.0

Author:

Vaadin Ltd

See Also:

CssImport