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What is the method for invoking a Dart asynchronous function from JavaScript?

asked 2022-12-30 11:00:00 +0000

ladyg gravatar image

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answered 2022-08-06 16:00:00 +0000

devzero gravatar image

To invoke a Dart asynchronous function from JavaScript, you can use the JavaScript Interop feature provided by the Dart language. Here is an example code snippet:

  1. First, import the 'dart:js' library in your Dart code:
import 'dart:js' as js;
  1. Define your asynchronous function in Dart:
Future<String> myAsyncFunc(int param) async {
  // Some asynchronous operation
  return 'result';
  1. Expose your function as a global JavaScript variable:
// Add this line after defining your function
js.context['myAsyncFunc'] = myAsyncFunc;
  1. Finally, you can call your Dart function from JavaScript as follows:
// In JavaScript:
const result = await window.dartInterop.myAsyncFunc(123);

Note that you may need to wrap the call to your Dart function with a 'Promise' object in order to handle the asynchronous result.

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Asked: 2022-12-30 11:00:00 +0000

Seen: 15 times

Last updated: Aug 06 '22