Chapter 8. Building JSNI components

This chapter covers

  • Overview of JSNI

  • Passing Java objects to JavaScript

  • Calling Java code from JavaScript

  • Loading external JavaScript libraries

  • Wrapping JavaScript code as Java classes

GWT’s key benefit is the ability to abstract away from JavaScript, which frees the developer (you!) from concerns over browser differences and developing in an untyped programming language. But just as normal application code occasionally uses assembly-language segments for special needs, so client-side GWT applications can interact directly with JavaScript. In a normal application, you may use assembly code to get speed advantage or access hardware in the only way it can; for GWT applications, in our experience, there are four possible ...

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