GWT provides three ways to create custom user interface elements. There are three general strategies to follow :
Create a widget by extending Composite Class : This is the most common and easiest way to create custom widgets. Here you can use existing widgets to create composite view with custom properties.
Create a widget using GWT DOM API in JAVA : GWT basic widgets are created in this way. Still its a very complicated way to create custom widget and should be used cautiously.
Use JavaScript and wrap it in a widget using JSNI : This should generally only be done as a last resort. Considering the cross-browser implications of the native methods, it becomes very complicated and also becomes more difficult to debug.
