I would like to call a Dart function from Javascript.
I would like to compile a Dart script containing a Dart function using dart2js
(version 1.1.3) and then load the generated .js
file into a Javascript environment and call that function from Javascript.
Something along the lines of calling myHyperSuperMegaFunction
below from Javascript.
import 'dart:js' as js;
int myHyperSuperMegaFunction(int a, int b) {
return a + b;
}
main() {
js.context['myHyperSuperMegaFunction'] = new js.JsFunction.withThis(myHyperSuperMegaFunction);
}
I tried compiling the above with dart2js
and loading the generated .js
file into Chrome. Variable myHyperSuperMegaFunction
is registered and defined as
function () {
return _call(f, captureThis, this, Array.prototype.slice.apply(arguments));
}
However, when I call myHyperSuperMegaFunction(2,3)
from Chrome Javascript console I get the following error NoSuchMethodError : method not found: 'Symbol("call")' Receiver: Instance of '(){this.$initialize' Arguments: [Instance of 'Window', 2, 3]
You don't need to use new js.JsFunction.withThis
. In your case just use :
js.context['myHyperSuperMegaFunction'] = myHyperSuperMegaFunction;
For your information new js.JsFunction.withThis
has to be used when you need to use the this
Js context. In your error, you can see that the first parameter is Instance of 'Window'
which is the global context in Js.
来源:https://stackoverflow.com/questions/21936318/how-to-call-a-dart-function-from-javascript