calling javascript from Dart

Question

i was able to fire off an alert message from dart, but couldn't figure out how to call a function I wrote in another js file from dart. This would have been a great selling point if it was straight forward. I did see this post, which got me started, but i feel there must be a way, so please share the love if you figured it out.

Here's what I've done:

Add this to yaml file:

dependencies: js: hosted: js
Add import statement to top of dart file: import 'package:js/js.dart' as js;
Add this bit of code to show alert message

js.scoped(() { js.context.alert("jump for joy!"); });
Here's the part which I think should work but doesn't: given that I have a javascript function doSomething(), I should be able to call

js.context.doSomething();

Alexandre Ardhuin · Accepted Answer · 2013-12-14 20:38:05Z

21

First add the js package as dependency in your pubspec.yaml :

dependencies:
  js: any

Then you can use your own js function myFunc() like that :

import 'package:js/js.dart' as js;

main() {
  js.context.myFunc();
}

js.context is an alias to javascript window.

See Using JavaScript from Dart: The js Library for more details.

edited Dec 14, 2013 at 20:38

answered Dec 12, 2012 at 17:52

Alexandre Ardhuin

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6 Comments

Kai Sellgren Over a year ago

And when importing, we should specify the prefix for the above code to work: import 'package:js/js.dart' as js;

BraveNewMath Over a year ago

what is js:0.0.13 for and how is that different from js: any

alearg Over a year ago

is js.scoped still being used?

Alexandre Ardhuin Over a year ago

js.scoped has been removed since package:js is baked with dart:js.

alireza easazade Over a year ago

js.context does not exist anymore

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psygo · Accepted Answer · 2020-10-04 00:19:11Z

12

Maybe my answer will be worth it for somebody, so that's why I'm posting a simple JS function call from Dart.

Add the js package dependency:
```
dependencies:
  js: any
```
Create a JS file, let's say example.js:
```
function test() {
  return 12+20;
}
```
Add the example.js above inside index.html with the <script src="..."> tag.

Interop the function above from JS to Dart:

@JS()
library t;

import 'package:js/js.dart';

@JS()
external int Test();

class MyOwn {
  int get value => Test();
}

And, in AngularDart's TODOLIST — which is default component available —:
```
@override
Future<Null> ngOnInit() async => print(MyOwn().value);
```

edited Oct 4, 2020 at 0:19

psygo

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answered May 20, 2019 at 20:35

Mohsin AR

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1 Comment

AlexK Over a year ago

What do I do if the JS I want to call is an NPM package? Eg., github.com/polkadot-js/extension

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