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You can attach a Web Toolkit module to any HTML page
you like,
making it easy to add bits of AJAX functionality to
existing pages
without starting from scratch.

A base module CatalogForm.gwt.xml gets created in the
com/gwt directory. A module is a GWT configuration XML file. The
base module inherits from the com.google.gwt.user.User module
and is listed below.






A module contains configuration information about inherited modules,
entry-point class name, source path, and public path. When a module is
loaded every entry-point class gets instantiated and its
EntryPoint.onModuleLoad() method gets invoked. Source path
specifies files in which packages/sub-packages are to be compiled into
JavaScript. Public path specifies the directory path for static resources. In
the preceding example, the entry point class is
com.gwt.client.CatalogForm.
The com.gwt.client.CatalogForm.java class consists of a
method onModuleLoad(). In the onModuleLoad() method a new
Button and a Label are created. A ClickListener is added to the
button. When the button is clicked the label text gets set to ???Hello World???
if the initial text is ??????.


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