Dart JavaScript interoperability

Introduction

Dart-JavaScript interoperability lets us run JavaScript code from our Dart programs. The interoperability is achieved by using the js library to create Dart stubs. These stubs describe the interface we'd like to have with the underlying JavaScript code. At runtime calling the Dart stub will invoke the JavaScript code.

Examples

Calling a global function

Suppose we'd like to invoke the JavaScript function JSON.stringify which receives an object, encodes it into a JSON string and returns it.

All we'd have to do is write the function signature, mark it as external and annotate it with the @JS annotation:

 @JS("JSON.stringify")
external String stringify(obj);

The @JS annotation will be used from here on out to mark Dart classes that we'd like to use in JavaScript as well.

Conclusion

In this page (written and validated by A. Gawali) you learned about Dart JavaScript interoperability . What's Next? If you are interested in completing Dart tutorial, your next topic will be learning about: Dart Wrapping JavaScript classes and namespaces.

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