Standard Library? about flutter_qjs HOT 4 CLOSED

Fristly, you need to pass your dart function right after FlutterQjs object initialized.

final engine = FlutterQjs();
engine.dispatch();
final setToGlobalObject = await engine.evaluate("(key, val) => { this[key] = val; }");
await setToGlobalObject.invoke(["fetch", (String url) async {
  return Dio().get(url).then((response) => response.toString());
}]);
setToGlobalObject.free();

Then, all the evaluation can access the fetch function:

print(await engine.evaluate("fetch(`https://reqbin.com/echo/get/json`).then(res => `The response is: \${res}`)"));

You should get the response string like that:

The response is: {"success":"true"}

It should be noted that js side cannot reconize dart object except the basic type.
You can passed dart object into js and then receive back in dart side.
In js side, the dart object is an empty object and you cannot call the method directly.

I used to implement some function in https://github.com/ekibun/nezumi/blob/master/lib/engine/engine.dart

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The standard library in quickjs is crude and not included in this plugin. I recommand you implement them on dart side with the following steps:

1. evaluate a function that change the global this
2. call the JsInvokable with dart function

final setToGlobalObject = await engine.evaluate("(key, val) => { this[key] = val; }");
await setToGlobalObject.invoke(["http", (String url) {
  return Dio().get(url).then((response) => response.data);
}]);
setToGlobalObject.free();

For more information please check https://github.com/ekibun/flutter_qjs#use-dart-function-breaking-change-in-v030 .

Or you can use flutter_js instead. That implementation provides some standard functions.

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I don't mind doing the networking on the dart side. I saw the example in the docs, could you share another example?

For example if I have a the following code fetch("https://...").then(res => res.json()); and want to evaluate it, how can I use Dio when fetch is invoked?

When I try to evaluate it will say it's not defined. Can I pass a dart function to the script at evaluation time?

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Oh this is super helpful!! Thank you, definitely seeing the pieces and how they fit together now. 🔥

Thank you very much! I also had a prototype with headless in app web view as well.

Based on my research into this, I might write a blog post on it!

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