Exception when calling jQuery.fadeIn with a callback function from Dart

Question

Based on:

How do I create an anonymous JavaScript function/callback with Dart's JS interop?

I have written this Dart function:

fadeIn(String selector) {

    Completer completer = new Completer();

    context.callMethod("\$", [selector]).callMethod("fadeIn", [FADE_SPEED, () {
        print("callback");
        completer.complete();
    }]);

    return completer.future;

}

Which should do (in JavaScript) $(selector).fadeIn( FADE_SPEED, function() { console.log("bacllback");.

However, when running this function in Dartium, I get the following exception:

Exception: type '() => dynamic' is not a subtype of type '(dynamic) => dynamic' of 'f'.

I don't understand the Exception. What have I done wrong?

The message "callback" does get printed out to the console though.

Günter Zöchbauer · Accepted Answer · 2014-05-21 11:31:52Z

0

I think you need to add an argument to the following callback

change

[FADE_SPEED, () {

to

[FADE_SPEED, (e) {

Often the underscore is used to indicate that the argument should be ignored

[FADE_SPEED, (_) {

The error message indicates that one argument was provided but the provided callback method accepts none.

answered May 21, 2014 at 11:31

Günter Zöchbauer

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